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!
!!
! 93.0 Ma
91.5 Ma88.1 Ma
87.5 Ma
A
B
Geologic Map of the Benson Lake Pendantwestern Yosemite National Park,central Sierra NevadaGeology by V. Memeti , S.R. Paterson , R. Economos ,
*3 *4S. Erdmann , R.B. Miller
*1University of Southern California, Los Angeles*2University of California, Los Angeles*3Dalhousie University, Halifax, Canada*4San Jose State University, San Jose
*1 *1 *2
0 0.5 1 km
Topographic base from USGS7.5 minute quadrangles PiuteMountain, Matterhorn Peak, Tuolumne Meadows, Ten Lakes1000 m UTM Grid, Projection NAD 1927, zone 11S
10000
9600
9200
8800
8400
8000
7600
72000 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200 3400 3600 3800 4000 4200 4400 4600 4800 5000 [m]
[ft]
A B
2200
2300
2400
2500
2600
2700
2800
2900
3100
3000
[m]
DZ
DZ
70
87
Quaternary - alluvium, colluvium
Cathedral Peak granodiorite
Tuolumne Intrusive Complex (95-85 Ma)
porphyritic Half Dome granodiorite
equigranular Half Dome granodiorite
transitional Kuna Crest/Half Dome granodiorite
Kuna Crest granodiorite
Yosemite Valley intrusive suite (102 Ma)
diorite-gabbro
mingled gabbroic to granodioritic rocks
granites of the Yosemite Valley intrusive suiteundifferentiated
leucogranite in the mingling zone
El Capitan biotite granite and pendant xenoliths
pendant units (Precambrian to Cambrian)
calcsilicate and marble
metapelite and metapsammopelite
white quartzite
Explanation
Contacts and structures
sharp contact with orientation
gradational contact
inferred contact
fault
major fold hinge (antiform)
mingled El Capitan granite and mafic rocks
Foliations
S IIS IIS2 1 0
magmatic foliation
magmatic foliation with subsolidus overprint
main foliation pendant
Kcp
Kphd
Kehd
Ktkc
Kkc
Kyvd
Kyvmd
Kyvmg
Kyvlg
Kyvg
Kyvx
pЄ-Єmp
pЄ-Єq
pЄ-Єm
Geochronology
CA-ID-TIMS U/Pb zircon ages in the Tuolumne intrusion analyzed by R. Mundil and J. Matzel at the Berkeley geochronology center
DZdetrital zircon age sample locationsof Memeti et al. (2010)
70
interpolated magmatic foliationtraces in cross section
pЄ-Єq
pЄ-Єmp
pЄ-Єq
Kcp
Kphd
Kehd
Ktkc
Kkc
Kyvmd
Kyvmg
Kyvlg
Kyvmd
pЄ-Єm
Kyvg
Kyvx
Kyvd
!
Kcp
Kphd
Kehd
Ktkc
Kkc
Kyvg
pЄ-Єq
pЄ-Єq
pЄ-Єq
pЄ-Єq
pЄ-Єq
pЄ-Єmp
pЄ-Єmp
Q
Q
Q
Q
Kyvg Kyvx
pЄ-Єq pЄ-ЄqpЄ-Єmp
pЄ-Єmp Kyvmd
Kcp
Kphd
KehdKtkcKkc
DIGITAL MAP AND CHART SERIES DMCH013DOI: 10.1130/2012.DMCH013
Published byThe Geological Society of America, Inc.3300 Penrose Place • P.O. Box 9140Boulder, Colorado 80301-9140
©2012 The Geological Society of America
Memeti, V., Paterson, S.R., Economos, R., Erdmann, S., and Miller, R.B., compilers, 2012, Geology of the Benson Lake Pendant, Western Yosemite National Park, Central Sierra Nevada: Geological Society of America Digital Map and Chart Series 13, doi:10.1130/2012.DMCH013. For permission to copy, contact [email protected]. ©2012 The Geological Society of America. All rights reserved.