Mem. Fac. Sci. Eng. Shimane Univ

Senes A 31, pp. 217-241 (1997)

Chemical compositions of kosmochlor and related minerals from tectonic blocks within the Osayama

ultramafic body in the Sangun metamorphic belt,

southwest Japan

Shizue SA~MOTO

Department of Geology. Faculty of Science. Shimane University

(Received September 19, 1997)

Abstract

The Osayama ultramafic body occurs in the high-P/T Sangun metamorphic belt, southwest Japan

The northeastern parts of the Osayama ultramafic body are a serpentinite melange with tectonic blocks of

diverse lithology and metamorphic grade. Chemical compositions of the constituent minrals from the tec-

tonic blocks such as kosmochlor-bearing and -free actinolite-tremolite rocks and j adeitites in the Osayama

ultramafic body are provided in this paper

Key words: kosmoch lor. ureyite, diopside. jadeite, actinolite-tremolite rock, jadeitite. serpentinite

melange. Osayama ultramafic body, Sangun metamorphic belt. southewst Japan, chelnica/

composition.

Geology of the Osayama ultramafic body

Kosmochlor (ureyite) , NaCrSi206, has been discrived from three localities in the world,

i.e. Myanmar, Russia, Italy, before the first discovery of kosmochlor in Japan was reported

from the Osayama ultramafic body occurring within the Sangun high-pressure type (glau-

cophanic) metamorphic belt (Fig. I ; Sakamoto and Takasu, 1996; Takasu and Sakamoto,

1996) . The Osayama ultramafic body consists mainly of harzburgite with small amounts of

dunite and metagabbro (Kobayashi et al., 1987; Matsumoto et al., 1995) , although most parts

of the body are severely serpentinized. The northeastern parts of the Osayama ultramafic body

are of serpentinite melange (Tsujimori and Takasu, 1994) with tectonic blocks of diverse size,

lithology and metamorphic grade. The tectonic blocks include spotted schists, non-spotted

schists, garnet-glaucophane schists, metagabbros, metadiabases, albitites, omphacite rocks,

j adeitites , stilpnomelane schists, pelitic schists and actinolite-tremolite rocks (Watanabe et al . ,

1987; Kobayashi et al., 1987; Tsujimori and Takasu, 1994; Sakamoto and Takasu, 1996) . Kos-

mochlor and kosmochlor component-bearing clinopyroxenes occur in actinolite-tremolite

blocks. It occurs as lenticular (25 cm x 130 cm) or vein (. 1-20 cm in width) shapes in serpen-

tinite matrix (Figs. 2 and 3) .

218 Shizue SAl~MOTO

a 'L

~p

~ :~' *_ ~~ ~ e

a'

Fig. I b

1 30'E

a~

o oc ~1. ~~~

a

~!~~&

[Emll

t~

O 50 100 km

Sangun metamorphic rocks

Ultramafic rocks

b

AS

N

o o

OS

A

dp

10 km

~~ab

TG

Katsuyama l]

rilL~JI Ultramafic rocks

~Kosmochlor beartng rock

Fig. 1. a. Distribution of the Sangun metamorphic belt (after Shibata and Nishimura

1989) . b . Distribution of ultramafic bodies in the eastern parts of the Sangun belt

(Mitsuno and Sugita, 1980; Matsumoto et al., 1995) . AS: Ashidachi body; YM

Yanomine body; OS: Osayama body; TG: Taguchi body

Petrography of actinolite-tremolite rocks, jadeite and basic scllist

1. Kosmochlor-bearing actinolite-tremolite rocks

The kosmochlor-bearing actinolite-tremolite rock (Sakamoto and Takasu, 1 996) consists

of a white matnx with green vemlets of a few mm wide showing no preferred orientation. The

matrix consists mostly of amphibole (actinolite-tremolite) with subordinate amounts of diop-

sidic clinopyroxene, albite, K-feldspar and serpentine. The green veinlets are composed of kos-

mochlor-rich clinopyroxene, uvarovite, Cr-bearing actinolite-tremolite series amphibole with

small amounts of chromite

Clinopynoxene occurs both m the matrix and the green veinlets. It forms subhedral colum-

nar and acicular crystals up to 0.4 mm long. Kosmochlor-rich clinopyroxene is restricted to

Chemical compositions of kosmochlor and related minerals from the Osayama area 219

stil pnomelane

schist

K

A

pelitic schist

actinolite rock

A

~!lg serpentmlte

Ab

Ab

3

' d~bris

glaucophane schist

o 2m

Fig. 2. Occurrence of tectonic blocks of various lithologres m serpentmite matnx

actinolite-tremolite rock; A:' actinoli'te-tremolite rock; Ab: albitite

K: kosmochlor-beanng

Fig. 3. Kosmochlor-beanng within srpentinite of

actinolite-tremolite

the Osayama

ro ck

ultramafic

block

body.

Hammer as a scale rs 33 cm long

green veinlets. It shows a distinct pleochroism with X=yellow, Y=yellowish green and

Z = green. Kosmochlor-rich clinopyroxene is compositionally heterogeneous, grading into diop-

side within a single crystal. It sometimes shows zoning with kosmochlor-rich clinopyroxene

core and diopside rim. Occasionally very fine lamellae texture in kosmochlor is developed proba-

bly due to exsolution Fig. 8.

Amphibole occurs as aggregate of fine fibrous crystals (c. 0.1 mm) in the matrix, and inter-

stice between diopside and kosmochlor-rich pyroxene in the green veinlets . A schistosity conslst-

ing mainly of matrix amphiboles sometimes shows crenulation fold. It is usually colorless, but

220 Shtzue SAl~MOTO

chromium-rich varieties are pale green. Albite and K-feldspar ( < 0.5 mm) shows a granoblastic

texture in albite and K-feldspar pools ( < 2 mm) in the matrix. Uvarovite occurs as light to dark

green euhedral crystals ( < 0.05 mm) in green veinlets. It also occurs at the boundary of be-

tween serpentine and amphibole in matrix. Chromite ( < I mm) ocdurs as resorbed anhedral

crystal and is surrounded by uvarovite and kosmochlor-rich clinopyroxene

2. Actino]ite-tremolite rocks

Actinolite-tremolite rocks consist mainly of actinolite-tremolite series calcic amphibole

with small amounts of serpentine, albite, K-feldspar, phengite, chlorite, diopside, uvarovite,

sphene, fuchsite and opaque minerals

Amphibole occurs as aggregate of fine fibrous crystals ( < I mm) . Serpentine occurs as ag-

gregate of fine fibrous crystals ( <0.1 mm) . Albite is of anhedral crystal ( < 0.5 mm) . K-

feldspar occurs as subhedral crystal ( < 0.3 mm) . There are two modes of occurrence of

K-feldspar, 1.e., forming a schistosity with amphibole, and occurring associated with white

mica. White mica occurs as tabular crystal ( < 0.4 mm) . Chlorite occurs as tabular crystal

( < 0.1 mm) . The elongation is negative, and shows pleochroism with X' = Iight brown and

Z'=1ight brownish green. Diopside occurs as subhedral crystal ( < 0.6 mm) . Uvarovite occurs

as dark green very fine crystal ( < 0.01 mm) . Sphane occurs as fine crystal ( < 0.02 mm)

Opaque minerals is of anhedral crystal ( < I mm) .

3. Jadeitites

Jadeitites consist mainly of jadeite with small amounts of omphacite, diopside, pectolite,

analcrme, sphene and rutile

Jadeite occurs as euhedral to subhedral prismatic crystal (c. I mm; up to 4 mm) . Ompha-

cite and diopside occur as anhedral fine crystals ( < 0.3 mm) . Pectolite occurs as columnar crys-

tal ( < 0.2 mm) . Analcime occurs in interstice of jadeite and pectolite. Rutile ( < 3 mm) is sur-

rounded by sphene

Kobayashi et al. (1987) reported stronalsite and Ba-rich minerals from the jadeitites

4. Basic schists

Baslc schists consrst mainly of white mica, chlorite, amphibole with small amounts of al-

bite, clinopyroxene, epidote, fuchsite and opaque minerals. A schistosity is defined by

preferred orientation of white mica and chlorite. Schistosity is sometimes crenulated (c. 4 mm

in wavelength)

White mica and chlorite occurs as tabular crystal ( < 2 mm) and amphibole occurs as acicu-

lar crystal ( < 2 mm) . The elongation of chlorite is positive, and shows pleochroism with

X' =brown and Z'=dark brown. Albite occurs as anhedral crystal ( < 0.5 mm) , and shows al-

bite twin. Some of them are porphyroblastic (albite spot) . Clinopyroxene occurs as subhedral

crystal ( < 0.3 mm) . Epidote occurs as subhedral to anhedral crystal ( < 2 mm) . It is sometimes

surrounded by opaque minerals (0.5 mm) . It is green in color close to the opaque minerals

Fuchsite occurs as tabular crystal ( < I mm) , and is located around clinopyroxene. It shows

Chemrcal composrtlons of kosmochlor and related mmerals from the Osayama area 221

pleochroism with X' =yellowish green and Z' =bluish green

Chemical conrposition of minerals

Chemical compositions of minerals have been analysed by EPMA (JEOL JXA-8800M) in

the Reserch Center for Coastal Lagoon Envrronments, Shimane Universrty. The analyses were

performed at 15 kV of accelerating voltage and 2 x 10-8 A of specimen current, 3-10/lm of

probe diameter and correction method of Bence and Albee ( 1968)

1. Clinopyroxenes

Clinopyroxenes from kosmochlor-bearing and -free actinolite-tremolite rocks and

jadeitites have been chemically analyzed by EPMA (Table 1) . They are classified into kos-

mochlor, diopside (sodic augite) , omphacite and jadeite. Kosmochlor occurs in kosmochlor-

bearing actinolite-tremolite rocks, and diopside (sodic augite) occurs in actinolite-tremolite

rocks and j adeitites . Omphacite and jadeite are developed restrictedly in j adeitites

a. Clinopyroxenes in kosmochlor-bearing actinolite-tremolite rocks

Clinopyroxene is classified into diopside and kosmochlor. It contains Orl9.2 wt.~6 Cr203

and 0.3-7.7 wt.~6 Na20. It consists of 0.0-56.3 m01~6 kosmochlor (Ko) , 43 .7-98.0 m01~6 diop-

side, including diopside and small amount of hedenbergite and orthopyroxene (Di) , O.CHIO. 1

m01~6 jadeite (Jd) and 0.0-4.5 m01~6 aegirine (Aeg) molecules (Fig. 4) . The Jd component

decreases with increasing Ko in diopside. These chemical compositions of the clinopyroxene in-

dicate a wide range of Di-Ko solid solution with up to 56 m01~6 of Ko. Ko-free diopside con-

tains up to 10.1 m01~6 of Jd.

The kosmochlor component-bearing clinopyroxenes from other actinolite-tremolite rock

sho'w kosmochlor-jadeite and kosmochlor-omphacite solid solution (Fig. 4) . Kosmochlor com-

ponent-bearing clinopyroxenes from the Osayama ultramafic body shows kosmochlor-diopside

solid solution, with up to 56 m01~6 of kosmochlor in diopside (Fig. 4) . Such chemical composi-

tions of kosmochlor have been reported only from the Osayama area

b. Clinopyroxenes in kosmochlor-free actinolite-tremolite rocks

Clinopyroxene contains 25.8-26.2 wt.~6 CaO, 17.5-17.6 wt.~6 MgO and 2.3 wt.9~ FeO,

with low contents of Na20 ( < O. I wt.~6) , and it does not contain Cr203. It is almost pure diop-

side (99.4-99.5 m01~6 of Di) , with scarce amounts of aegirine content ( <0.6 mol~ of Aeg)

(Fig. 5a) .

c. Jadeitites

Clinopyroxene is classified into sodic augite, omphacite and impure jadeite following

Essene and Fyfe (1967) . It contains 1.2-14.6 wt.~6 Na20 and 0.1-23.8 wt.~~ CaO. It consists

of 2.6-99.6 m01~6 Jd, 0.4-91.6 m01~6 Aug and CHI0.2 m01~6 Aeg (Fig. 5b) .

d. Basic schists

Clinopyroxene is classified into sodic augite following Essene and Fyfe ( 1967) . It contains

0.9 wt.~6 Na20 and 23.0 wt.~6 CaO. It consists of 6.2 m01~6 Jd, 93.8 m01~~ Aug (Fig. 5c)

Di

Fig. 4.

~~~I !

/

f e

,' A AAAA A

A o dL A A db~~A

KO o I high-pressure metamorphiC rock

* GP o 2 iadeititeS o:~~~:: A 3 UltramatiC rockS

dL 4 kirrlberlite pjPes

* 5 meteorites OSa ama

o oo

cb~ 8~; ~90

L o o'o oo

A dL o eoo~:::;~o~oo ~' '='C o g Sb oo o ~4; o ~~~oqDt~oo:o o o oq80

o

o(2) e o o 9~ o "A A o A o~ o~o ~? oe =0'...=. , 4~ A ro o o G~ - odboo e o

AA o ~~ o e 8 AAA A AA A

O

o

*

A

A

AJL

eA o o A PS8 oAAd8e A

dL e

oo ooo

ooo o o

o

o

oo

o

oo oo

oo

o o o

~) bJ N)

A

Chenucal compositions of kosmochlors and releted clinopyroxenes from the Osayama ultramafic body and the other localities. Ko: kosmochlor; Di: diop-

side, including minor hedenbergite and orthopyroxene; Jd: j adeite; Aeg: aegirine. I : high pressure metamorphic rocks (French Alps: Mevel and Kienast,

1980; Italy: Carpenter, 1981; Abs-Wurmbach et al., 1985; Harlow and Olds, 1987; Philippot and Kienast, 1989; Myanmar: Harlow and Olds, 1987; Japan

Nishiyama et al., 1986; Banno, 1992, 1993) ; 2: jadeitites (artifacts in Mexico and Guatemala: Harlow and Olds, 1987; Guatemala: Harlow and Olds, 1987;

Harlow, 1994; Myanmar: Lacroix, 1930; Harlow and Olds, 1983; Yang, 1984; Mevel and Kienast, 1986) ; 3: ultramafic rocks (ROSS et al., 1954; Harlow and

Olds, 1987) ; 4: kimberlite pipes (Russia: Sobolev, 1974; Sobolev et al., 1971, 1973, 1975; Egorov et al., 1992; South Africa: Sobolev; 1974). ; 5: meteorites

(Frondel and Klein, 1965; Couper et al., 1981) ; Dashed-lined area: composition range of kosmochlor and related clinopyroxenes from the Osayama

ultramafic body

Chemical compositions of kosmochlor and related minerals from the Osayama area 22 3

Aeg

~I

Aeg

~l

Au g Jd

Aeg

L~l

o**el~･e e~) e ~ @ e

Aug Jd

Aug

Fig. 5.

Jd

Chemical compositions of Na-pyroxenes . Aeg: aegirine; Aug: augite Jd Jadeite

free actinolite-tremolite rock; b : jadeite; c: basic schist

a: kosmochlor-

2. Amphiboles

Amphiboles from kosmochlor-bearing and -free actinolite-tremolite rocks and basic

schists are classified into actinolite and tremolite on the basis of Leake et al. ( 1997) . The estima-

tion of Fe3 + is based on the assumption Si + Ti +AI + Fe+ Mn + Mg + Cr = 13 . Mg/ (Mg +Fe2+)

ranges from 0.73 to I .OO (Table 2, Fig. 6) , and Ca ranges from 1.55 to 2.04, with low contents

of Al203 (0-2.0wt.~6), Na20 (CH3.0 wt.~) and K20 (O~).3 wt.~6). Some amphiboles con-

224

1 .O

Shizue SA~MOTO

0.5

0.0

磁、．t・…11・・

●

▲

⑧

ム

aCtinOlite magnesiohornblende tschermakite

ferr◎一 ferr◎hornblende ferrotschermakite

aCtinOlite

⑧　Ko－bearing　actindite－trem◎1ite　r◎ck

▲　Ko－free　actinolite－tremolite　rock

x　Basic　schist

8.0

7.5 7.0 6.5 6.0 Fig. 6. Chemrcal compositrons of Ca-amphiboles

tains high Cr203 With up to 4.3 wt.~6

Amphibole from basic schist is classified into actinolite on the basis of Leake et al

5.5

( 1997) .

3. Feldspars

Plagroclase in kosmochlor-bearing and -free actinolite-tremolite rocks shows almost pure

albite with Na/ (Na+ Ca) = 0.99-1 .OO (Table 3)

K-feldspar in kosmochlor-bearing and -free actinolite-tremolite rocks is pure K-feldspar

with K/ (K+Na+ Ca) = 0.96-1 .OO.

4. Garnets

Garnets occur m kosmochlor-bearing and -free actinolite-tremolite rocks. However, these

from kosmochlor-free actinolite-tremolite rocks were not analyzed because of very fine grains

Garnets in kosmochlor-bearing actinolite-tremolite rocks have high Cr203 (19.0-22.1

wt.~6) and CaO (31.9-33.6wt.~6) , consisting of uvarovite (62.7-70.8m01~~) , grossular

(11.CH19.7 m01~6) and andradite (10.3-17.5 m01~6) molecules, but no pyralspite molecules

(Table 4, Fig. 7) .

5. Serpentines

Serpentines occur m kosmochlor-bearing and -free actinolite-tremolite rocks

Mg/(Mg+Fe) ranges from 0.85 to 0.89, with contents of Al203 (0.7-3.7 wt.~6) S erpen-

Chenucal composrtrons of kosmochlor and related mmerals from the Osayama area 225

Uv Uv

g~

~)

~.~'>~

e e

Gr

Fig. 7.

And GrtAnd

Chemical compositions of garnets. Uv: uvarovite; Gr: grossular; And: andradite; Pyra

Pyral

pyral-

s pite.

tine close to chromite contains high Cr203 content (<1.4 wt.~6) (Table 5) .

6. Chlorites

Chlorites occur kosmochlor-bearing and -free actinolite-tremolite rocks

Mg/ (Mg+Fe) ranges from 0.86 to 0.91, Si/(Si+AD ranges from 0.61 to 0.69

located close to chromites contain high Cr203 content ( < 5 .4 wt.~) (Table 6)

Chlontes

7. Phengites

Phengites occur in kosmochlor-free actinolite-tremolite rocks

It has high Si content ranging from 6.69 to 6.87. Phengite being located close to chromite

contains high Cr203 content ( <6.9 wi.~6) (Table 7)

8. Opaque minerals

Chromite and Cr-spinel are present in kosmochlor-bearing and -free actmolite-tremolite

rocks, respectively. Both of them can not be analyzed. Because they are severely altered (Table

8) .

9. Epidotes Epidotes occur basic schist. Pistasite molecules of the epidotes range from 3.3-19.1 ~6

(Table 9) . Some of them have very high contains of Cr203 (< 15.0 wt.~6)

10. Prehites

Prehites occur in basic schist. Fe/ (Fe+Al) ranges from 0.00~ to 0.027 (Table 10) .

226 Shizue SAl~vloTO

11. Pumpellyites, Sphenes, Pectlites and Analcilnes

Pumpellyites occur in basic schist. Sphenes occur in Ko-free actinolite-tremolite rock and

basrc schrst. Pectlite and analcime occur in jadeitite. The chemical compositions of these miner-

als are shown in Tables 1 1-14.

Acknowledgments Thanks are due to Dr A. Takasu of Shimane University for his review of the manuscript

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*: in Japanese with English abstract

**: in Russian with English abstract

t: in Japanese

tt: in Russian

ttt: in French

Fig. 8. Elemental color map photos of occurrence of kosmochlor. The color map analyses were made using the JEOL JXA 8800M electron microprobe analyzer of

the Research Center for Coastal Lagoon Envirouments , Shimane University, under the following analyiical conditions: accelerating voltage 1 5 kV; probe

current 4 x 10-8 A; dwell time 56 msec.; no. of pixels 700 X 700; pixel size: 0.26 >< 0.26 pm. The relative concentration of the element is represented by color

(see color bar in the photo) .

Fig. 9. Elemental color map photos of occurrence of kosmochlor. The analysis was done under the following conditions: accelerating voltage 15 kV;

probe current 4-8 x 10-8 A; dwell time 52~3 msec. ; no . of pixels 1000 X 1000; pixel size: 0.24 x 0.24 pm. The relative concentration of the element

is represented by color (see color bar in the photo)

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Table I . (Continued)

L舳olo

Sam1oN0．

Si02Ti02A1203F60｝MnOM四

CaON820Cr203Tot81

Si↑i

Al

F0

MnMgCaNaCr↑oto1

Ko－boorir－　oo1＝illo1沽o一㎞omo1汁o？ook

Ko　　　　　　　　　　　　1〈o3　　　　Ur1

End　mOm』8俺

KOJd

AoDiO　x

　糾　　　　50　　　　453．05　　　　52．61　　　　52，64

　0，01　　　　0，11　　　　0．O0

　0，53　　　　　0，31　　　　　0，43

　3．69　　　　10，39　　　　　3，95

　0，30　　　　　1，06　　　　　0，32

　6．36　　　　10，40　　　　　5．26

12．20　　　　24．30　　　　11153

　7，12　　　　　0，31　　　　　7．56

17，04　　　　　0．0’1　　　　18．59

10α30　　　　99．56　　　100．28

1．988　　　2．O05　　　1．984

0．O00　　　　0．O03　　　　0．000

0．023　　　　0．014　　　　0．019

0．116　　　　0．331　　　　0．124

0．010　　　　0．034　　　　0．010

0．355　　　　0．590　　　　0．295

0．490　　　　0．992　　　　0．465

0．517　　　　0．023　　　　0．552

0．504　　　0．O02　　　0．554

4．O08　　　　3．995　　　　4，005

50，11　　　　0．21　　　　54，26

1，14　　　　1，37　　　　0，00

0，11　　　　0，68　　　　0．00

48．64　　　97．74　　　45，74

0．OO　　　　　O．00　　　　　0－OO

＊To畑1F6as　F60．

　　253，03

0，08

0，81

5，64

0，38

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18，23

3，73

7．97

99．58

1．992

0．002

0．036

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0．543

0．733

0．272

0．237

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23，53

2，80

0．68

72，98

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0．1フ

1，19

7，28

0．5211．96

22，93

1，36

1．01

99．99

1．999

0．005

0．052

0．225

0．016

0．664

0．915

0．098

0．030

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2，93

5川

1．74

90州0．00

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0，09

0，62

5，37

0．3810．09

17，72

8，97

8．4499．93

1．991

0．003

0．027

0，168

α0120．562

0．710

0．288

0．249

4．010

24，84

1，87

1．95

70，71

0．63

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0，070．フ4

5，55

0，45

9．O016，61

4，07

9．6099．81

1．989

0．O02

0．033

0．174

0．014

0郁50．666

0．295

0．284

3．992

28I68

1，15

0．O0

67，28

2．90

I〈o1・8　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　I〈o1．3

　　752，78

0，000，613：8フ

O．26

7刃7

14075．88

14．48

99．82

1．982

0．000

0．027

0．122

0．008

0．440

0．566

0．428

0．430

4003

42，97

0，00

0．O056，83

0．21

　1553，31

　0．08

　059　4，06

　0，36

　9．86

17，32

　4，44

　9．52

100．34

1．987

0刀020．026

0．151

0．O“

O．547

0．691

0．321

0．280

4．01フ

27，70

1，24

2．74

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Table 1. ( Continued) ~) uJ J~

Litho o KoHireo A-T rock Jade'te B schist

Sam le 4-2 No 13 15

08,t Jd2

2

3

10 12 18 14 15 17 18 l9

Osa Jd 1

4

5

2-5

12 Si02 Ti02 Ala03 Fe O*

MnO MgO CaO Na20 Cr2 03

Tota

53.84 0.0 6

O OO 2.3 1

0.1 9

1 7.53

26.1 9

O 09

0.00 1 O0,21

54.54 0.05

O 03

2 27 0.1 1

17,61

25,83

O 08 O O1

1 OO 53

55,58

O 37

4 06

5.02

O 08 1 2 63

20 07

8 15

O OO

1 OO 96

53 10 0.1 6

3,68

4 68 O,1 1

1 8.64

20,47

2,89

0.02

98.75

57.89 O 06

21 .35

0.50

O OO

2 71

3 78

13 66

O OO

99 95

54 20 O 28

O 79

4 58

O 08 1 5 ,08

23 49 1 ,53

O OO

99 98

54.20 0,20

0,92

4.47 O.1 1

15.37

23,78 1 .21

O.02 1 O0,28

58 62 O 28

5 21

4.1 5

O 15

13 65

19 25

3 06 0.01

99.38

54.86 O 24 8 13

2,54

O 06

1286 1 6.78

4 72

O OO i O0.1 9

54.26 o 42 1 .72

5 29

o 23

1 4 06

21 96 2 39

0.04

10o 37

54.49 O .43

0,91

5.84

O 19 1 4.1 8

22,83

1 82

0.00

1 O0.69

55.89 O 22

1 2 41

2,85

0,04

13,50

6.47 8,1 1

0.03

99 02

60 27

0.02

24.94 0.1 O

O O1

0,02 0.1 O

1 4.57

O OO 1 O0.03

57.41

O 40 1 2.5 1

2.5 1

7 80 1 1 .58

7 86

O OO 1 O0.07

58,85

0,04

20.37

1 20

o 08

2.72

4 20 1 2 32

o oO

99 78

53.28

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7 22

0.23

1 2.95

23.00

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0.00

99.28 S'

T'

Al

Fe

Mn Mg Ca Na Cr Tota

1 968

0.002

0,000 0.071

O 006 0.955 1 ,025

0.006

O OOO 4 033

1 .98 1

0.001

O OO1

0.069

0.003 0.953 1 .005

O.006 0.000

4,02O

2 002 O O1 O

O.172 O 151

O 002 O 678

O 774 O 220 O OOO 4 009

1 9e4

o,004 0.1 60

0.1 45

o.003 0,751 0.81 1

o.ro7 o ool

4.046

1 .98 1

O 002 O 861

O014 0.000 0.1 38

O 189

O 906 O OOO

4,040

1 992

O 008

O 084 O 139

0.002 O 826 0,925 0.1 o9

0,000

4 036

1 986

O C06 O 040 -

O 137

O 008

O 839 O 933

O 086 O OO1 4 03 1

1 .952

0.008

0.224 0.1 26

0.005

0.740 0.751 0.21 6

0.000 4.021

1 .95 1

O 006 0,341

O 076

0.002 O 681

0.639 0.3 25

0.000 4.022

1 989 O O1 2

O 074 O 1 62

O 007 0.768 O 862 0.170 O OO1

4 044

1 gg8 O O1 2

0.039 O.1 79

0,006 0.774 0.896 0.1 29

0,0OO 4.034

1 959

o a06 0,5 1 3

o 069 o aol

o l05

o 243 0.551

o ool

4 047

2.020 0.001

O.985

O 003

O OOO O OO1

0.004 O 946

O OOO

3 960

2.01 1

O O1 1

0,5 1 6

O 074 O.OOO O 407

0.434 0.534 0.000

8 987

2 014 O OO1

O 821

O C84 O 002 0.1 39

0,154 0.8 1 7

0.000

3 983

1 .990

O OO1

0.075

0.225

O 007 O 720

0.920 O 062

0.000 4.OO1

End members Ko Jd Ae D'

Oec

0.00

0.00

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99 88

0.00

O 03

O OO

0.52 98 71

O 74

O OO 1 7,25

4 76

77 51

O 48

O 06 1 2.1 5

8 O8

79 41

0.31

O OO

84.68

144 18 93

O OO

o OO

2.58

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89,46 O oo

0,06

2.55

5,88 91 ,57

0,00

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17.44

3 97

74,55

4 O1

o oo

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8 30

63 44 4 28

o,1 1

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83.55

o oo

o.oo

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8 97

87 39 o oo

o 08

46 44 6 78

23 90 22,79

0.00

99,eo

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o 38

o,03

o oo

52.56 1 .75

44.22 1 47

O OO

83 28

O OO 1 5.68

1 09

0.00

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1 66

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8V'OO L

O0'O 8L'9 P

90'O

O0'O

O0'O

O0'O ZO' O

90'6 L

90'O

9v.t9 9

99'66 O0'O 90'L L

VO' O

Q0'O

O0'O

O0'O

C0'O

eV'8P

O0'O

SO'V9

CLo~

89'86

vo'o vg'g L

80'o

60'o

oo'o

to'o

80'o zv'8 L

vo'o 9c'89

e9

ezo~

LC'OOL

LO'O

L0'O VL' L L

O0'O

O0'O

O0'O

O0'O 89'6 L

OO'O

18'89

7L eo~

L 8'86

Z0'O

70'O 90'Z L

CO' O

O0'O

L0'O

O0'O 89'OZ

O0'O

O0'99 pe

L o~

C6'66

?~'O V L'O

6e' L L

L L'O

ZC'O

C0'O O L 'O

9V'6 L

O0'O

9V'89

ZZ ~ Jn

100J l-V uHe8q-o)l

le~ol

80eJO OZ~

071'N OI'O OS,N

Ouw *O 9d

80Z V eO!l ZO!S 'ON

el weS

suo~JCxo 8 Jod suor~l~D '~slqos orsl~q pue ~OOJ o~HoruoJ1-0~Houl~ole ooJJ- pu~: ~ulJ~eq-Jolqooulso~ ul SJ13dspIOJ Jo suolllsodul:oo IBo~uroqO

oloH'!,l

'L olqBl

23 8 Shizue SAK~loTO

Table 4.

L'tho o

Sam e

No Si02 Ti02 AI203 Fe203* MnO MgO CaO Cr203 Tota S'

T'

A Fe

Mn Mg Ca Cr Tota

K Url

Chemrcal compositions of garnets in kosmochlor-

bearmg actinolite-tremolite rock. Cations per 12

oxygens .

be*,i* A-T ,..k Ur2

1 8 33 9 86.98 35.46 34.96 34.72 0.05 0.02 O 75 O 71 3.74 3.76 3 47 3 37 6.00 4 04 4 20 4 83 O.1 4 0.1 4 0.1 5 0.24 0.71 0.1 2 O 1 1 O I O 32.58 33.25 33 30 33,59 1 8.96 21 .45 21 .28 20 94 99.1 6 98.24 98.22 98 .OO

28 35 90 O 08

3 81

4 70

018 018

33 G4 21 OO

99 49

3.033 2.930 2,g21 2.963 2.963

0,003 0.047 0.045 0.005 0.001

0,361 0.343 0.834 O 871 0.370

0,370 0.265 0.274 0.292 0.254

0.01 O 0,01 1 0.01 7 0.01 3 0.01 O

0,087 0.01 4 0.01 3 0,022 O.OI 5

2,862 2,989 3.027 2 978 2.976

1 ,228 1 .409 1 .392 1 .8G9 1 .41 6

7,954 8.006 8 023 8 007 8.006

Kol -4 K02 Kol 3

1 13 52 35.83 83.60 35.07 36 30 0,82 0,55 0.1 6 0.21 8.66 4,32 8 .5 6 4.41 8,83 6,39 3.83 4.1 1 0,1 5 0,34 0.1 5 O 1 3 0.09 0.05 0.10 0.02 33.45 31.86 33.50 33.63 22 13 21 54 21 66 20 62 98.96 98.65 98.03 99 43 2.987 2,945 2 984 2 821

0.020 O O1 O O O1 3 O 035

0.359 0.352 0.427 0.427

0.240 0.242 0.254 0.403

0,01 1 0.01 1 0.009 O.O24

0,01 1 O O1 3 O 002 0.006

2,978 3.01 3 2 961 2.864

1.453 1.437 1 339 1 .428

8.009 8 022 7 990 8 009 * Tota Fe as Fe203.

Table 5. Chemrcal compositions of serpentines in kos-

mochlor-bearing and -free actinolite-tremolite

rock. Cations per 7 oxygens

Litholo Ko bearin A-T rock KoHiee A-T rock

Sam le Osa2 1-3b 1-Ga

No. 7 5 Si02 41 .1 1 39 83 Ti02 0.00 O O1 AI203 0.67 3.69 FeO* 7,31 8 29 MnO 0.1 9 O 09 MgO 34.75 31 ,87 Cr203 0.13 1 42 Total 84.1 6 85 20 Si 2.03 2 1 .953 Ti 0.000 O OOO Al 0.039 0.21 3 Fe O 302 O 340 Mn 0.008 0.004 Mg 2,558 2.330 Cr 0.005 0.055 Total 4.944 4.895

1 -Gb

1 3 10 18 41 .52 40.20 41 .99 89 98 0.00 0.01 0.01 O OO 1 ,78 1 .95 1 .70 1 15 7.98 8.27 9,27 8.65 0.1 2 0.04 0.22 O 25 32.86 3 1 .94 30.36 33 81 0.1 9 0.18 0.74 O 20 84.45 82.59 84.29 84.04 2.041 2.027 2.078 1 .997 0.000 0.000 0.0OO O OOO 0.1 03 0.1 1 6 O.O99 0.068 0.328 0.849 0.384 O 361 0.005 0.002 0.009 O.OI 1 2.406 2.398 2.238 2 51 6 0.007 0.007 0.029 O 008 4.891 4.899 4,838 4.960

* Total Fe as FeO.

Table 6.

Litho o

S am

No,

e

S'02 Ti02 Al203 Fe O*

MnO MgO Cr203 Tota S'

Ti

A Fe

Mn Mg Cr Tota

Chemrcal compositrons of chlontes in kosmochlor-bearing

and -free actinolite-tremolite rock. Cations per 28 oxygens

Ko-beerin Url

A-T rook KoH?oe A-T rook

2-2 3-7 4-2

1 7 28 8 3 4 1 8 9 1 O 1 2 32.20 31 .38 30.0~ 81 22 31.18

0.00 0,00 0.03 O OO 0.02

1 2.1 4 1 5.68 1 6.1 5 1 5.07 1 1 ,85

7.36 8.0g 8.63 8 66 7.73

0.1 4 0.09 0.1 1 0,1 5 0.02

29.73 30.08 29.1 3 29 1 2 30.03

5.40 1 .32 1 .75 2 43 4.90

86.97 86.G4 85.81 86.65 85.78 6 300

O OOO

2 799

1 204 O 023

8.665

0,835 1 9,825

6.21 7 6.1 1 2 5.938 6.1 1 8 0.003 0.000 0.004 O COO 2.784 3.599 3,765 3 480 1 .289 1 .31 7 1 .428 1 41 9 0.003 0.01 5 0.01 8 0.025 8.9 1 9 8.728 8.58 6 8.5QO 0.772 0.203 0.274 0,376 1 9.988 1 9.975 20 O1 3 1 9 91 6

3 1 .91 30.68 33.75 29.78 30 94

0.08 O OO 0,00 0.00 0.00

1 4.54 1 4.35 18,88 1 4.3 1 1 4.64

6.41 6.38 5,75 6.3 1 6.54

0.1 2 O 04 0,1 O 0.1 O O 14

31 .21 30 73 83,41 29.78 29 91

2,77 4.85 0,70 5.28 5.1 1

86,99 87,03 87.59 85.56 87,28

6.1 66 6.402 5.920 6.01 5 5 978 0.004 0.000 0.000 O OOO O OOO 3,3 1 1 3.1 02 3.352 3 .354 3.295 1 .O86 O,91 2 1 .049 1 .063 1 O89 0.020 0.01 6 0.01 7 0.023 0.007 8.983 9.440 8.81 8 8 662 8 91 9 0.423 0.105 0.829 0.785 0.746 1 9,942 1 9.976 1 9.984 1 9.908 1 9.983

* Tota Fe as FeO

Chemical compositions of kosmochlor and related minerals from the Osayama area 23 9

Table 7. Chemrcal compositrons of phengrtes

tinolite-tremolite rock and basic schist

in kosmochlor-free ac-

Litholo K0~ee A-T rock B

h'Bt

Cations per 22 oxygens

Sam le No.

Si02 Ti02 AI203 FeO *

MnO MgO OaO Na20 K20 Or203 Total

3-5

5 7 18

8 -6 148a 2-3 50.91

0.00

26 71

1 16 0.0 O

4.74

O OO

O 10 1 1 .27

O 81

95.70

51 02

O 02 26.77 1 .05

O OO

482 O O1

O 18

11 21

O 73

95.76

51 06 O.07

27 04 1 .29

O OO 5 .03

O 08

0.10 1 O 60

O 49

95.76

2 1 51 .1 1

O O1

24 30 1 64

0.25

5.90

0.07

O 03 1 0.63

1 68

95.62

51 .OG

0.05

22 52 1 el

o o8

4 35

o 04 0.1 3

1 o 96

5 .45

96.25

1 4 49 70 O 07

22 77

1 86

O 02

4 87

O 08

O 25

lO 79

6 37

96.78

51 .1 7

0.03

24,50 1 ,84

o,oa 4.3 4

o.04

o 28 1 o.e8

5 .48

98 18

6 f6 5 7 51 .48

O 07

22.83

1 46

O O3 5.1 1

O 08

O 2O

10 66

646 98 38

5 1 .44

O 04

22.52 1 57

0.08

4 83

O 24

012 11 20

6.46

98 50

50.89 o.05

25.e3 1 .28

o 03 4.1 5

o 07

0.29

10 86 3 .5 7

96 82

5 1 .03

O 03

22.GO 1 .47

0.03

4.78

0.07 0.1 3

1 0.36

6.85

97.35 S'

T'

Al

Fe

Mn Mg Ca Na K Cr Totdl

6 776

O OOO

4 189 O J 29

O OOO O 940

O OOO

0.026 1 913

O.085 1 4 057

6 778

O.002 4 191 0.1 1 7

O.OOO

0,954 0.0O1

O 033 1 ,899

0.077 1 4.052

6.7 62

O 007

4 220

0143 O OOO O 992 O O1 1

O 026 1 79O O.O5 1

1 4.003

6 838

O.OO1

3 831

O 183

0.028 1 .1 76

0.01 O

0.008

1 814 O.1 78

1 4 067

6.870

0.005 3 .5 1 O

0.1 81

0.009

O 872 0.006

O 034 1 88O

O.579 1 4.007

6.694 0.007

3.614 O 209

O 002

O 977 0.01 2

0.065 1 .853

O 678 1 4.1 1 2

6.737

O.a03 8 801

0.181

O.O02 O 851

O O06

O.O59 1 .798

O.570

14.aol

6.782

O 007

3.544 O 1 61

O O03

1 O03 O O1 1

0.05 1

1 .791

0.672 1 4 024

6.797

o 004 3.507 0.1 78

o 009 o.951

o oe4 o 031 1 .887

o 674 1 4 067

6 747

O OO5

4 OO4 O 142 O OO3

O 820

OOIO 0.074 1 .886

O 374 1 4.01 5

6 790

o.003 3 .54G

0.1 e4

o oo3

0.947 o O1 o

o.034 1 .758

0.72o 13.971

* Total Fe as FeO.

Table 8.

Lith K

be

Chemical compositions of opaque minerals in kosmochlor-bearing and -free actinolite-

tremolite rock and basic schist. Cations per 4 oxygens

s

fe

N. Si02 Ti02 Al203 Fe O*

MnO MgO OaO Na20 K20 Or203 Tota

Kol -4 2

O 83

2.25

O 66

26 32

a46 O 17

0.45

0.26 0.0 6

3 6.65

70.1 1

A-T rock

3

6.29

2.53 1 .1 9

29 18

2.95 0.1 4

6.1 7

0.1 9

O.O4

43.04 91 72

Url

10 8 09

O 97

2.20

27.55

2.15 5.1 1

O 2O

019 0.62

46 38

93.46

11

5.95

1 16 1 .64

29.64 2.1 1

3 87

O 21

O 18

O 41

48 08 92.75

Kol 1

7 18

2 38

1 38

28 4O

2.48 0.1 4

7.46

016 0.0 1

40.95

90.54

2

5.1 7

2 65

1 24

3O 87 2 98

O 09

5 15

O 17

O 03

41 66 9O O1

K02 Kol 3 5

1 0.1 O

1 .06

1 79

24,51

2 84 0.1 2

9 89 0,1 5

O 04

48 O4 92,54

51

K04ee A-T rook 2-2 3 -5 4-2

9 41 17 7 8 1 2

B 8ohi8t

2~8

1 5 06

1 31

1.48

1 9.48

1 72

0.13 1 4.83

0.1 1

O.04

40.13

94.24

7 27

O oO

5 32

60 75

0.00

o 87

o 30

0.05 0.0 1

2 07

76.14

1087 O OO

7.07

57.28

0.02

O 79

O.G2

O Q9

O O2

2 12

78 33

1 3 41

216 5 27

53.25

0.22 0.3 9

1 .20

0.1 9

0.48

0.59

77 16

1 7.58

1 .08

7,22

21 .73

1 54 1 8.51

O 05

O O1

O.O6

23 74 91 47

18 18 O 91

7 38

ro 72

1.52 1 9.1 4

O 04

O 02

O.08

23.74 91.68

1 32

0.20 8.1 O

34.65

3.93

O 26

O.08

0.22 D.1 3

42 28

91 17

10 0.91

O 28 6 .65

38.86 2 54 O 71

O 03

O 04 O 04

45.29 95 30

S' T' Al

Fe

Mn Mg C8 Na K Cr Tot

O 044 O 091

O 042 1 .1 77

O111 O014 O 026

O 027

O 004 1 ,549

8 085

O 243

O 074 0.054

0.944 0.097

O O08

O,256 O.OI 4

O.CO2 1 .8 1 5

3.O07

0.295

0.027

O.O94 O 840 O 066 O 277

O.O08

OO13 O O29 1 .335

2,985

O 225 O 033

O.073

O 987 O Oe8 0.1 90

O 009 O O1 3

0.020 1 436

3.004

O 279

O 069

O 068 O 921 0.08 1

0.008 0.8 1 O

0.01 2

0.000 1 .255

2 999

0.207

O 080 0.058 1 .O32

0.1 O1

O OO5 O 2Z1

O013 0.002 1 .81 6

3 084

O 371

O O29 O 078

0.753 0.073

O OO7

O 370 O.OI 1

O C02 1 250

2 942

0.5 1 9

0.084 0.060

0.559 0.050 0.007

0.547

0.007

0.002

1 092

2.876

O 372 O.OOO 0.321

2 GO1

O OOO O 028 O O1 6

O 005 O.OO1

O O84 3 428

0.485

O OOO

O 890

2 237

0.001

0.055 0.03 1

O 008

O OO1

O 078

3 286

O 616

O 075 O 285

2 043 O 009

O.027

O.059 O O1 7

O O28 O 021

3 179

0.564 0.025

O 278

O.583

O 042 O J584

O 002 O OO1

O 002 O 601

2 976

0.576

0.022 O 276 0.550 O O41

O 905 O OO1

O OO1

O OO1

O.595

2.968

O 053

0.006 0.380 1 .1 54

O 133 O.OI 5

O 003 O.OI 7

O.007 1 .33O

3 098

O 035

O 007 O 308

1 257

O 083 O 041

O OO1

O 003

O 002 1 384 3.1 1 7

* Tota Fe a8 FeO.

Table 9.

Litho o B

Chemical SChlst

hist

compositrons of epidotes

Cations per 12.5 oxygens

in basic

Sam e 2-3 No.

Si02 T'02 Al203 Fe 203*

MnO MgO OaO Na20 K 20

Cr203 Tote

2

36.68

0.05

1 9.98

1 63

O 30

3 71

22 23 0.21

O 02

844 93.25

8

36.71

O.05 2O O1

1 .68

O 25

8.60

22.28 O.81

8 03

92 92

11

32 95

O.09 1 6 83

6 22 O .43

3 29 1 9.55

O 27

0.03 1 5.03

94.69

12 35.69 0.05

1 8.42

1 82

0.28

3.31

21 .68

O 29

0.05 1 O 37

91 .96

13

36 60 0.05

18 31 1 .58

0.28

3.55

21 79 0.31

O 04

10 78

93 29

14 85 82

O 07

17 19

1 59

0.25

3 38 21 .65

0.25

OOC 12 39

92 62

15 36.90 O 07

23,01 1 ,62

0,34

3 65

22.40

0.26

0.04

3.60 91 .89

17 37.14 O 08

24 48 1 .3 1

O 41

3.76

22 59 O 28

O 03 2.1 7

92.25

S'

11

A]

Fe

Mn Mg Ca Na K Cr Totcd

8.049

O 003 1 .957

O 102 O 021

0.459

1 979

O.034 0.002

O.554 8 16O

8.059

O.003 1 .965

O.105 O O1 8

0.447 1 .988

0.050

O.OOO O.529 8 1 64

2 800

o 006 1 .e85

o 397 o 031 o 41 6

1 779

o 044 o 003 1 009

8 172

3 O34 O.Q03 1 .845

0.1 1 6

O O20 O 41 9

1 .974

O 048

0.0O5

0.696 8 161

3 063

O 003 1 .805

O 099

O 020 O.443 1 .953

O.050 O 004 0.713

8.153

3 040

O 004 1 7l9

O 101

O018 O 427

1 968

O 041

O O03

O 831

8.1 52

3.a61

o.a04 2.25o 0.101

o.024 0.451

1 .990

o 042

o.a04 O.286

8.1e4

3.O51

0.005

a370 O.081

O 029

O.460 1 988

0.045

O 003 O 141 8.1 72

* Tota Fe 8s Fe203.

'oed se ed le~ol *

'OQd 8e ed p$01 * O L Z' ~

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Chemca1compos1t1ons　of　kosmoch1or　and　re1ated　m1nera1s　from　the　Osaya㎜a　area　　　241

■able14． Chemca1compos1t1onsof如a1cmemjade1teCat1ons　per6oxygens

No　　　　　　　3Si02　　　　　58．71

Ti02　　　　　　0．00

AI203　　　　　23．89

F60ホ　　　　　0．05

Mn0　　　　　0．02Mゆ　　　　　0．00C80　　　　　　0．00

N820　　　　　12．84

K20　　　　　0．04Cr203　　　　　0．00To也■　　　　　　95．55

Si　　　　　2，046

↑i　　　　　OmOA1　　　　　α9811＝o　　　　　　0，001

Mn　　　　　0，001

Mg　　　　0』00Co　　　　　　0，000

N8　　　　　　0，867

K　　　　　　0，002

Cr　　　　　　0，000↑0t81　　　　　　　8．898

＊↑oto1F68s　F80．

目本語要旨

　大佐山超苦鉄質岩体は，西南目本内帯三郡変成帯に分布する　大佐山超苦鉄質岩体の北東部は蛇紋岩

メラソジヱを形成しており，様々なテクトニック・ブロヅクを伴う．テクトニック・ブロヅクのうち，

コスモクロアを含むアクチノ閃石一トレモラ閃石岩，コスモクPアを含まないアクチノ閃石一トレモラ閃

石岩，ひすい輝石岩，塩基性片岩中に含まれる鉱物のEPMA分析による化学組成を示した．