Ocean Drilling Program Initial Reports Volume 155

ERRATA

for

Volume 155 of the Initial Reports of the Proceedings of the Ocean Drilling Program

After final pages had been printed for Vol. 155 of the Initial Reports of the ODPProceedings, the following error was found:

The Hole 935A Natural Gamma Ray-Resistivity-Velocity logging data on page 271 shouldhave followed the log on page 319.

The Hole 934B Natural Gamma Ray-Resistivity logging data on page 316 should have beenplaced on page 271.

PROCEEDINGSOF THE

OCEAN DRILLINGPROGRAM

VOLUME 155

INITIAL REPORTSAMAZON FAN

Covering Leg 155 of the cruises of the Drilling Vessel JOIDES Resolution,Bridgetown, Barbados, to Bridgetown, Barbados, Sites 950-946,

25 March-24 May 1994

Roger D. Flood, David J.W. Piper, Adam Klaus,Stephen J. Burns, William H. Busch, Stanley M. Cisowski, Adrian Cramp,

John E. Damuth, Miguel A. Qoni, Simon G. Haberle, Frank R. Hall, Kai-Uwe Hinrichs,Richard N. Hiscott, Renato O. Kowsmann, John D. Kronen, Jr., David Long, Michel Lopez,Diane K. McDaniel, Patricia L. Manley, Mark A. Maslin, Naja Mikkelsen, Futoshi Nanayama,

William R. rformark, Carlos Pirmez, José Ricardo dos Santos, Ralph R. Schneider,William J. Showers, Wonn Soh, Jéröme Thibal

Shipboard Scientists

Adam KlausShipboard Staff Scientist

Prepared by theOCEAN DRILLING PROGRAM

TEXAS A&M UNIVERSITY

Jennifer A. MarinVolume Editor

in cooperation with theNATIONAL SCIENCE FOUNDATION

andJOINT OCEANOGRAPHIC INSTITUTIONS, INC.

This publication was prepared by the Ocean Drilling Program, Texas A&M University, as anaccount of work performed under the international Ocean Drilling Program, which is managed byJoint Oceanographic Institutions, Inc., under contract with the National Science Foundation. Fund-ing for the program was provided by the following agencies at the time of this cruise:

Canada/Australia Consortium for the Ocean Drilling Program, Department of Energy, Mines andResources (Canada), and Department of Primary Industries and Energy (Australia)

Deutsche Forschungsgemeinschaft (Federal Republic of Germany)

European Science Foundation Consortium for Ocean Drilling (Belgium, Denmark, Finland, Iceland,Italy, Greece, The Netherlands, Norway, Spain, Sweden, Switzerland, and Turkey)

Institut Français de Recherche pour 1'Exploitation de la Mer (France)

National Science Foundation (United States)

Natural Environment Research Council (United Kingdom)

University of Tokyo, Ocean Research Institute (Japan)

Any opinions, findings, and conclusions or recommendations expressed in this publication are thoseof the author(s) and do not necessarily reflect the views of the National Science Foundation, the par-ticipating agencies, Joint Oceanographic Institutions, Inc., Texas A&M University, or Texas A&MResearch Foundation.

It is recommended that reference to the whole or to part of this volume be made in one of the follow-ing forms, as appropriate:

Flood, R.D., Piper, D.J.W., Klaus, A., et al., 1995. Proc. ODP, Init. Repts., 155: College Station, TX(Ocean Drilling Program).

Shipboard Scientific Party, 1995. Site 930. In Flood, R.D., Piper, D.J.W., Klaus, A., et al., Proc.ODP, Init. Repts., 155: College Station, TX (Ocean Drilling Program), 87-122.

Effective Publication Dates of ODP Proceedings

According to the International Code of Zoological Nomenclature, the date of publication of a workand of a contained name or statement affecting nomenclature is the date on which the publicationwas mailed to subscribers, placed on sale, or when the whole edition is distributed free of charge,mailed to institutions and individuals to whom free copies are distributed. The mailing date, not theprinted date, is the correct one.

The mailing dates of recent Proceedings of the Ocean Drilling Program are as follows:

Volume 151 {Initial Reports): March 1995Volume 153 {Initial Reports): March 1995Volume 154 {Initial Reports): May 1995Volume 134 {Scientific Results): October 1994Volume 139 {Scientific Results): October 1994Volumes 142/143 {Scientific Results): May 1995

Distribution

Copies of this publication may be obtained from Publications Distribution Center, Ocean Drilling Pro-gram, 1000 Discovery Drive, College Station, Texas 77845-9547, U.S.A. Orders for copies willrequire advance payment. See current ODP publication list for price and availability of this publication.

Printed July 1995

ISSN 0884-5883Library of Congress 87-655-674

Printed in Canada by D.W. Friesen & Sons Ltd.

The paper used in this publication meets the minimum requirements of American National Standard for Information Sciences-Permanence of Paper for Printed Library Materials, ANSI Z39.48-1984 ™

ForewordBy the National Science Foundation

The National Science Foundation is proud to play a leading role in partnership with theU.S. oceanographic community in the operation and management of the Ocean DrillingProgram (ODP). We are equally proud of the cooperation and commitment of our interna-tional partners, who contribute both financial and intellectual resources required to main-tain the high quality of this unique program. The Ocean Drilling Program, like itspredecessor, the Deep Sea Drilling Project (DSDP), is a model for the organization andplanning of research to address global scientific problems that are of high priority interna-tionally and of long-term interest to the scientific community and general public.

Major scientific themes guiding the development of specific drilling cruises range fromdetermining the causes and effects of oceanic and climatic variability to understanding thecirculation of fluids in the ocean crust and the resultant formation of mineral deposits.Although such studies are at the forefront of basic scientific inquiry into the processes thatcontrol and modify the global environment, they are equally important in providing thebackground for assessing man's impact on the global environment or for projectingresource availability for future generations.

The transition from the DSDP to the ODP was marked by a number of changes. The471-foot JOIDES Resolution, which replaced the Glomar Challenger, has allowed largerscientific parties and the participation of more graduate students, a larger laboratory andtechnical capability, and operations in more hostile ocean regions. The JOIDES Resolutionhas drilled in all of the world's oceans, from the marginal ice regions of the Arctic towithin sight of the Antarctic continent. Over 1,200 scientists and students from 26 nationshave participated on project cruises. Cores recovered from the cruises and stored in ODPrepositories in the United States and Europe have provided samples to an additional 1,000scientists for longer term post-cruise research investigations. The downhole geochemicaland geophysical logging program, unsurpassed in either academia or industry, is providingremarkable new data with which to study the Earth.

In 1994, NSF and our international partners renewed our commitment to the programfor its final phase. Of the 20 countries that supported ODP initially, only one, Russia, hasbeen unable to continue for financial reasons. As the reputation and scientific impact ofthe program continue to grow internationally, we hope to add additional members and newscientific constituencies. This global scientific participation continues to assure the pro-gram^ scientific excellence by focusing and integrating the combined scientific knowl-edge and capabilities of its member nations.

We wish the program smooth sailing and good drilling!

Neal LaneDirectorNational Science Foundation

Arlington, Virginia

ForewordBy Joint Oceanographic Institutions, Inc.

This volume presents scientific and engineering results from the Ocean Drilling Pro-gram (ODP). The papers presented here address the scientific and technical goals of theprogram, which include providing a global description of geological and geophysicalstructures including passive and active margins and sediment history, and studying indetail areas of major geophysical activity such as mid-ocean ridges and the associatedhydrothermal circulations.

The Ocean Drilling Program, an international activity, operates a specially equippeddeep-sea drilling ship, the JOIDES Resolution (Sedco/BP 471), which contains state-of-the-art laboratories, equipment, and computers. The ship is 471 feet (144 meters) long,is 70 feet (21 meters) wide, and has a displacement of 18,600 short tons. Her derrick tow-ers 211 feet (64 meters) above the waterline, and a computer-controlled dynamic-positioning system stabilizes the ship over a specific location while drilling in waterdepths up to 27,000 feet (8230 meters). The drilling system collects cores from beneaththe seafloor with a derrick and drawworks that can handle 30,000 feet (9144 meters) ofdrill pipe. More than 12,000 square feet (1115 square meters) of space distributed through-out the ship is devoted to scientific laboratories and equipment. The ship sails with a sci-entific and technical crew of 51 and a ship's crew (including the drill crew) of 62. The sizeand ice-strengthening of the ship allow drilling in high seas and ice-infested areas as wellas permit a large group of multidisciplinary scientists to interact as part of the scientificparty.

Logging, or measurements in the drilled holes, is an important part of the program.ODP provides a full suite of geochemical and geophysical measurements for every holedeeper than 1300 feet (400 meters). For each such hole, there are lowerings of basicoil-industry tools: nuclear, sonic, and electrical. In addition, a borehole televiewer is avail-able for imaging the wall of the hole, a 12-channel logging tool provides accurate velocityand elastic property measurements as well as sonic waveforms for spectral analysis ofenergy propagation near the wall of the hole, and a vertical seismic profiler can recordreflectors from below the total depth of the hole.

The management of the Ocean Drilling Program involves a partnership of scientistsand governments. International oversight and coordination are provided by the ODPCouncil, a governmental consultative body of the partner countries, which is chaired by arepresentative from the United States National Science Foundation. The ODP Councilperiodically reviews the general progress of the program and discusses financial plans andother management issues. Overall scientific and management guidance is provided to theoperators of the program by representatives from the group of institutions involved in theprogram, called the Joint Oceanographic Institutions for Deep Earth Sampling (JOIDES).

The Executive Committee (EXCOM), made up of the administrative heads of theJOIDES institutions, provides general oversight for ODP. The Planning Committee(PCOM), with its advisory structure, is made up of working scientists and provides scien-tific advice and detailed planning. PCOM has a network of panels and working groups thatscreen drilling proposals, evaluate instrumentation and measurement techniques, andassess geophysical-survey data and other safety and siting information. PCOM uses therecommendations of the panels and committees to select drilling targets, to specify thelocation and major scientific objectives of each two-month drilling segment or leg, and toprovide the science operator with nominations for co-chief scientists.

Joint Oceanographic Institutions, Inc. (JOI), a nonprofit consortium of U.S. oceano-graphic institutions, serves as the National Science Foundation^ prime contractor forODP. JOI is responsible for seeing that the scientific objectives, plans, and recommenda-tions of the JOIDES committees are translated into scientific operations consistent withscientific advice and budgetary constraints. JOI subcontracts the operations of the pro-gram to two universities: Texas A&M University and Lamont-Doherty Earth Observatory

of Columbia University. JOI is also responsible for managing the U.S. contribution toODP.

Texas A&M University (TAMU) serves as science operator for ODP. In this capacity,TAMU is responsible for planning the specific ship operations, actual drilling schedules,and final scientific rosters, which are developed in close cooperation with PCOM and therelevant panels. The science operator also ensures that adequate scientific analyses areperformed on the cores by maintaining the shipboard scientific laboratories and computersand by providing logistical and technical support for shipboard scientific teams. Onshore,TAMU manages scientific activities after each leg, is curator for the cores, distributessamples, and coordinates the editing and publication of scientific results.

Lamont-Doherty Earth Observatory (LDEO) of Columbia University is responsible forthe program's logging operation, including processing the data and providing assistance toscientists for data analysis. The ODP Data Bank, a repository for geophysical data, is alsomanaged by LDEO.

Core samples from ODP and the previous Deep Sea Drilling Project are stored forfuture investigation at four sites: ODP Pacific and Indian Ocean cores at TAMU, DSDPPacific and Indian Ocean cores at the Scripps Institution of Oceanography, ODP andDSDP Atlantic and Antarctic cores through Leg 150 at LDEO, and ODP Atlantic and Ant-arctic cores since Leg 151 at the University of Bremen, Federal Republic of Germany.

Scientific achievements of ODP include new information on early seafloor spreadingand how continents separate and the margins evolve. The oldest Pacific crust has beendrilled and sampled. We have new insights into glacial cycles and the fluctuations ofocean currents throughout geological time. Many of the scientific goals can be met onlywith new technology; thus the program has focused on engineering as well as science. Todate, ODP engineers have demonstrated the capability to drill on bare rock atmid-ocean-ridge sites and have developed techniques for drilling in high-temperature andcorrosive regions typical of hydrothermal vent areas. A new diamond coring system prom-ises better core recovery in difficult areas.

In addition, ODP is cooperating closely with other geological and geophysical pro-grams; for example, in 1991 the first hole was drilled by ODP for emplacement of a seis-mometer near Hawaii for the Ocean Seismic Network. JOI is pleased to have been able toplay a facilitating role in the Ocean Drilling Program and its cooperative activities, and weare looking forward to many new results to come.

D. James BakerPresidentJoint Oceanographic Institutions, Inc.

Washington, D.C.

OCEAN DRILLING PROGRAM

MEMBER ORGANIZATIONS OF THE JOINTOCEANOGRAPHIC INSTITUTIONS FORDEEP EARTH SAMPLING (JOIDES)

University of California at San Diego, Scripps Institutionof Oceanography

Columbia University, Lamont-Doherty Earth Observatory

University of Hawaii, School of Ocean and Earth Scienceand Technology

University of Miami, Rosenstiel School of Marine andAtmospheric Science

Oregon State University, College of Oceanic andAtmospheric Sciences

University of Rhode Island, Graduate School ofOceanography

Texas A&M University, College of Geosciences andMaritime Studies

University of Texas at Austin, Institute for Geophysics

University of Washington, College of Ocean and FisherySciences

Woods Hole Oceanographic Institution

Canada/Australia Consortium for the Ocean DrillingProgram, Department of Energy, Mines and Resources(Canada) and Department of Primary Industries andEnergy (Australia)

European Science Foundation Consortium for OceanDrilling (Belgium, Denmark, Finland, Iceland, Italy,Greece, The Netherlands, Norway, Spain, Sweden,Switzerland, and Turkey)

Federal Republic of Germany, Bundesanstalt fürGeowissenschaften und Rohstoffe

France, Institut Français de Recherche pour 1'Exploitationde la Mer

Japan, University of Tokyo, Ocean Research Institute

United Kingdom, Natural Environment Research Council

PRIME CONTRACTOR

Joint Oceanographic Institutions, Inc.Washington, D.C.

David A. FalveyDirector, Ocean Drilling Programs

OPERATING INSTITUTION

College of Geosciences and Maritime StudiesTexas A&M UniversityCollege Station, Texas

Robert A. DuceDean

OCEAN DRILLING PROGRAM

Philip D. RabinowitzDirector

Timothy J.G. FrancisDeputy Director

Richard G. McPhersonAdministrator

Jack G. Baldauf, ManagerScience Operations

Barry W. Harding, ManagerEngineering and Drilling Operations

Russell B. Merrill, Curator and ManagerScience Services

Robert E. Olivas, ManagerTechnical and Logistics Support

John Coyne, ManagerInformation Services

LOGGING OPERATOR

Borehole Research GroupLamont-Doherty Earth ObservatoryColumbia UniversityPalisades, New York

David Goldberg, Head

PARTICIPANTS ABOARD THE JOIDES RESOLUTION FOR LEG 155

Roger D. FloodCo-Chief Scientist/Geological Oceanographer

Marine Sciences Research CenterState University of New York, Stony BrookStony Brook, New York 11794-5000U.S.A.

David J.W. PiperCo-Chief Scientist/Geologist

Atlantic Geoscience CentreBedford Institute of OceanographyP.O. Box 1006Dartmouth, Nova Scotia B2Y4A2Canada

Adam KlausStaff Scientist/Geophysicist

Ocean Drilling ProgramTexas A&M University Research Park1000 Discovery DriveCollege Station, Texas 77845-9547U.S.A.

Stephen J. BurnsInorganic Geochemist

Geologisches InstitutUniversitat BernBaltzerstrasse 1CH-3012 BernSwitzerland

William H. BuschPhysical Properties Specialist

Department of Geology and GeophysicsUniversity of New OrleansNew Orleans, Louisiana 70148U.S.A.

Stanley M. CisowskiPaleomagnetist

Department of Geological SciencesUniversity of California, Santa BarbaraSanta Barbara, California 93105U.S.A.

Adrian CrampSedimentologist

Department of GeologyUniversity of WalesCollege of CardiffP.O. Box 914Cardiff CF1 3YEUnited Kingdom

John E. DamuthSedimentologist

Department of GeologyP.O. Box 19049University of Texas at ArlingtonArlington, Texas 76019U.S.A.

Miguel A. GoniOrganic Geochemist

Department of Marine Chemistry and GeochemistryFye LaboratoryWoods Hole Oceanographic InstitutionWoods Hole, Massachusetts 02543U.S.A.

Simon G. HaberlePalynologist/Paleontologist

Smithsonian Tropical Research InstituteP.O. Box 2072Balboa, Republic of Panama

Frank R. HallPaleomagnetist

College of Marine StudiesUniversity of DelawareNewark, Delaware 19716U.S.A.

Kai-Uwe HinrichsOrganic Geochemist

Institut für Chemie und Biologie des MeeresUniversitat OldenburgPostfach 2503D-26111 OldenburgFederal Republic of Germany

Richard N. HiscottSedimentologist

Earth Sciences DepartmentMemorial University of NewfoundlandSt. John's, Newfoundland A1B 3X5Canada

Renato O. KowsmannSedimentologist

PETROBRASICenpeslDivexCidade Universitária Q7Ilha Do FundaöRio de Janeiro CEP 21949-900Brazil

John D. Kronen, Jr. (Jack)JOIDES Logging Scientist

Department of Geology and GeophysicsSOESTIUniversity of Hawaii at Manoa2525 Correa Rd.Honolulu, Hawaii 96822-2219U.S.A.

David LongPhysical Properties Specialist

British Geological SurveyWest Mains RoadEdinburgh EH9 3LAUnited Kingdom

Michel LopezSedimentologist

Université de Lille ILaboratoire de Dynamique Sédimentaire

et Structurale, SN. 559655 Villeneuve D'Ascq CedexFrance

* Addresses at time of cruise.

Diane K. McDanielInorganic Geochemist

Department of Earth and Space SciencesState University of New York, Stony BrookStony Brook, New York 11764-2100U.S.A.

Patricia L. ManleyPhysical Properties Specialist

Science CenterMiddlebury CollegeMiddlebury, Vermont 05753U.S.A.

Mark A. MaslinForaminifer Paleontologist

Geologisch Palaontologisches Institut und MuseumUniversitat KielOlshausenstrasse 40-80D-24098 KielFederal Republic of Germany

Naja MikkelsenDiatom/Foraminifer Paleontologist

Geological Survey of DenmarkThora Vej 82400 Copenhagen NVDenmark

Futoshi NanayamaSedimentologist

Department of Earth and Planetary SciencesKyushu University6-10-1 Hakozaki, Higashi-kuFukuoka 812Japan

William R. NormarkSedimentologist

U.S. Geological SurveyMS-919345 Middlefield RoadMenlo Park, California 94025U.S.A.

Carlos PirmezLogging Scientist

Lamont-Doherty Earth ObservatoryBorehole Research GroupColumbia UniversityPalisades, New York 10964U.S.A.

José Ricardo dos SantosNaval Observer

Diretoria de Hidrografia e NavegaçáoRua Baráo de Jaceguay SINBairro Ponta da Armaçáo, NiteróiRio de Janeiro CEP 24048-900Brazil

Ralph R. SchneiderSedimentologist

Fachbereich GeowissenschaftenUniversitat BremenPostfach 330440D-28334 BremenFederal Republic of Germany

William J. ShowersForaminifer Paleontologist

Department of Marine, Earth, and Atmospheric SciencesNorth Carolina State University1125 Jordan HallBox 8208Raleigh, North Carolina 27695U.S.A.

Wonn SohPhysical Properties Specialist

Department of Earth and Planetary SciencesFaculty of SciencesKyushu University6-10-1 Hakozaki, Fukuoka 812Japan

Jerome ThibalLDEO Logging Scientist

Laboratoire de Mesures en ForageInstitut Méditerranéen de TechnologieTechnopole de Chàteau-Gombert13451 Marseille Cedex 20France

SEDCO OFFICIALS

Captain Anthony RibbensMaster of the Drilling Vessel

Overseas Drilling Ltd.707 Texas Avenue South, Suite 103DCollege Station, Texas 77840-1917U.S.A.

Robert C. CaldowDrilling Superintendent

Overseas Drilling Ltd.707 Texas Avenue South, Suite 103DCollege Station, Texas 77840-1917U.S.A.

ODP ENGINEERING AND OPERATIONS PERSONNEL

Gene Pollard Operations Superintendent

ODP TECHNICAL AND LOGISTICS PERSONNEL

Wendy AutioRandy BallTim BronkAndy DeadyJohn EastlundMargaret HastedtBrad JulsonRobert KempKazushi ("Kuro") KurokiJaque LedbetterJon LloydErinn McCartyAnne PimmelSteve PrinzJo RibbensBill StevensJeff WalshMark WatsonBarry Weber

Assistant Laboratory Officer/X-rayMarine Laboratory Specialist/PhotographyMarine Laboratory Specialist /Storekeeper, Thin SectionMarine Laboratory SpecialistMarine Computer Specialist/System ManagerMarine Laboratory Specialist/PaleomagneticsLaboratory OfficerMarine Laboratory Specialist/ChemistryAssistant Laboratory Officer/X-ray, UnderwayMarine Laboratory Specialist/Downhole ToolsMarine Laboratory Specialist/Physical PropertiesMarine Laboratory Specialist/CuratorMarine Laboratory Specialist/ChemistryMarine Laboratory Specialist/Curatorial AssistantMarine Laboratory Specialist/YeopersonMarine Electronics SpecialistMarine Laboratory SpecialistMarine Electronics SpecialistMarine Computer Specialist/System Manager

Ocean Drilling Program Publications Staff

Publications SupervisorWilliam D. Rose

Chief EditorAnn Klaus

EditorsLona Haskins DearmontChryseis O. FoxEva M. MaddoxJennifer A. MarinRuth N. Riegel

Chief Production EditorJennifer Pattison Hall

Production EditorsJaime A. Gracia (this volume)William J. Moran

Senior Publications CoordinatorJanalisa Braziel Soltis

Publications CoordinatorGudelia ("Gigi") Delgado

Publications Distribution SpecialistAlexandra F. Moreno

Data Entry/Copier OperatorAnn Yeager

Senior PhotographerJohn W. Beck

PhotographerBradley James Cook

Chief IllustratorDeborah L. Partain

IllustratorsMelany R. BorsackL. Michelle Briggs (lead, this volume)Katherine C. IrwinMonica E. Rul

Production AssistantsCarrie R. CastillónAngeline T. MillerMary Elizabeth Mitchell

Student AssistantsPamela Ivette Baires, Michael F. Cordova, Shelley Rene Cormier, Susan Goodpasture, Ivy E. Oliver, M. Kathleen Phillips, Tai-Fang Wu, Yvonne C. Zissa

TABLE OF CONTENTS

LEG 155—INITIAL REPORTS

Acknowledgments 1

SECTION 1: INTRODUCTION

1. Introduction 5R.D. Flood, DJ.W. Piper, and Shipboard Scientific Party

2. Leg synthesis 17Shipboard Scientific Party

3. Morphology and structure of Amazon Channel 23C. Pirmez and R.D. Flood

4. Explanatory notes 47Shipboard Scientific Party

5. Underway geophysics 83Shipboard Scientific Party

SECTION 2: SITE CHAPTERS

6. Site 930 87

Shipboard Scientific Party

Site summary 87

Principal results 87

Setting and objectives 88

Operations 90

Lithostratigraphy 91

Biostratigraphy 96

Paleomagnetism 100

Organic geochemistry 103

Inorganic geochemistry 104

Physical properties 108

Core-seismic integration 110

In-situ temperature measurements 115

Synthesis and significance 116

7. Site 931 123


Site summary 123



Operations 126


Biostratigraphy 131

Paleomagnetism 138




Downhole logging 148




8. Site 932 175


Site summary 175



Operations 176


Biostratigraphy 183

Paleomagnetism 188







9. Site 933 201


Site summary 201

Principal results , 201


Operations 202


Biostratigraphy 209

Paleomagnetism 213








10. Site 934 241


Site summary 241



Operations 243


Biostratigraphy 249

Paleomagnetism 255







11. Site 935 273


Site summary 273



Operations 275


Biostratigraphy 281

Paleomagnetism 291








12. Site 936 321


Site summary 321



Operations 323


Biostratigraphy 339

Paleomagnetism 343








13. Site 937 383


Site summary 383



Operations 385


Biostratigraphy 394

Paleomagnetism 395






14. Site 938 409


Site summary 409



Operations 411


Biostratigraphy 419

Paleomagnetism 422







15. Site 939 437


Site summary 437



Operations 440


Biostratigraphy 445

Paleomagnetism 447






16. Site 940 463


Site summary 463



Operations 464


Biostratigraphy 472

Paleomagnetism 474








17. Site 941 503


Site summary 503



Operations 505


Biostratigraphy 512

Paleomagnetism 519







18. Site 942 537


Site summary 537



Operations 539


Biostratigraphy 549

Paleomagnetism 550







19. Site 943 569


Site summary 569



Operations 570


Biostratigraphy 578

Paleomagnetism 579






20. Site 944 591


Site summary 591



Operations 593


Biostratigraphy 605

Paleomagnetism 606








21. Site 945 635


Site summary 635



Operations 636


Biostratigraphy 646

Paleomagnetism 648





22. Site 946 657


Site summary 657



Operations 658


Biostratigraphy 666

Paleomagnetism 670








SECTION 3: SYNTHESES

23. Color-reflectance measurements obtained from Leg 155 cores 697R.R. Schneider, A. Cramp, J.E. Damuth, R.N. Hiscott, R.O. Kowsmann, M. Lopez, F. Nanayama,W.R. Normark, and Shipboard Scientific Party

24. Synthesis of magnetic remanence correlation, Leg 155 701S.M. Cisowski

SECTION 4: CORES

Core description forms and core photographs for:

Site 930 705

Site 931 749

Site 932 797

Site 933 821

Site 934 843

Site 935 867

Site 936 903

Site 937 939

Site 938 967

Site 939 1007

Site 940 1033

Site 941 1059

Site 942 1087

Site 943 1119

Site 944 1129

Site 945 1169

Site 946 1177

SECTION 5: SMEAR SLIDESSmear slide descriptions for:

Site 930 1201

Site 931 1203

Site 932 1205

Site 933 1207

Site 934 1209

Site 935 1211

Site 936 1213

Site 937 1215

Site 938 1217

Site 939 1219

Site 940 1221

Site 941 1223

Site 942 1225

Site 943 1227

Site 944 1229

Site 945 1231

Site 946 1233

(For a listing of JOIDES Advisory Groups and the ODP Sample-Distribution Policy, see ODP Proceedings, Initial Reports,Volume 151, pp. 919-926)

BACK-POCKET MATERIALS

Oversized Figures

Plate 1: Amazon channel-levee longitudinal profile.

Plate 2: Fan strike sections, upper levee complex.

CD-ROM

The CD-ROM in the back of this volume contains depth-shifted and processed logging data provided by the Bore-hole Research Group at Lamont- Doherty Earth Obser-vatory, as well as shipboard gamma-ray attenuationporosity evaluator (GRAPE), index property, magneticsusceptibility and natural gamma data of cores collectedon board JOIDES Resolution during Leg 155. This CDalso contains shear strength and resistivity tables, andexpanded versions of coring summary tables (includinglengths and depths of sections, location of whole-roundsamples, and comments on sampling disturbance) for all17 sites. CD-ROM production was conducted by theBorehole Research Group at Lamont-Doherty EarthObservatory, the wireline logging operator for ODP.

Table Directory Structure:README fileFiles are listed as follows:

Coring summary tables: 930cs.asc, 931cs.asc, etc.Resistivity tables: 930r.asc, 931r.asc, etc.Shear strength tables: 930s.asc, 931s.asc, etc.

Log and Core Data Directory Structure:NIH IMAGE directoryGENERAL INFORMATION directory

Format documentation fileINDEX fileSoftware documentation file

LOGGING DATA directoryREADME documentHOLE NUMBER subdirectory

Conventional logging subdirectoryAcronyms and units fileCompression documentation (when appli-

cable)Logging data subdirectories

Individual tool data filesProcessing documentation

FMS and dipmeter data subdirectoryDipmeter file(s) in ASCII formatFMS images in portable bit map (PBM-8

bit binary) format subdirectory1:1 ratio images subdirectory

Data files (every 10 m)Raster documentation file

1:10 ratio image subdirectoryData files (every 100 m)

Raster documentation fileCORE DATA directory

README documentCORELOG.MCD data fileSITE NUMBER subdirectory

HOLE NUMBER subdirectoryGRAPE data fileINDEX data fileMAGSUS data fileNATGAM data fileGRAPE documentation fileIndex properties documentation fileMagnetic susceptibility documentation fileNatural gamma documentation file

The above structure is identical in each site and/or hole.

The INDEX file contains a summary of all the filesloaded on the CD-ROM. The software documentationfile in the GENERAL INFORMATION directory con-tains information on which software packages work bestto import portable bit map (PBM-8 bit binary) rasterfiles. It also includes network sources for the graphicssoftware and data compression information. TheREADME file gives information on whom to contactwith any questions about the production of or data on theCD-ROM.

All of the ASCII files (with the exception of the SWFfiles) are TAB delimited for compatibility with mostspreadsheet and database programs. Holes that havemore than one logging pass with the same tools arelabeled Pass 1, Pass 2, etc. Holes that have long loggingruns are often divided into TOP, MIDDLE, and BOT-TOM directories. If the files are not in separate directo-ries they may just be annotated with "top," "mid," or"bot" in the data file names where space permits or a "t,""m," or "b" where there is room for only one character.Check the documentation file for a given directory if it isnot clear.

In the FMS-PBM format directory there are two subdi-rectories, 1:1 ratio with maximum 10-m-long image ras-ter files and 1:10 ratio with maximum 100-m-long imageraster files. The image raster files are named accordingto their depth interval. The raster documentation filescontain image file parameter information necessary foruse with most graphic software packages.

Summary of Log Data, Leg 155Hole 931B:

High resolution logsConventional logsSonic waveformsGeochemical logs (element and oxide wt%)Temperature logsMagnetic susceptibility dataFMS data

Hole 933A:High resolution logsConventional logsSonic waveformsTemperature logsMagnetic susceptibility dataFMS data

Hole 934BConventional logs

Hole 935A:High resolution logsConventional logsSonic waveformsTemperature logsFMS data

Hole 936AHigh resolution logsConventional logsSonic waveformsGeochemical logs (element and oxide wt%)Temperature logsFMS data




Summary of ODP Core Data, Leg 155Site 930

Hole A:

index.datHole B:

grape.datindex.datmagsus.datnatgam.dat

Hole C:grape.dat

index.datmagsus.datnatgam.dat

Hole D:grape.datmagsus.dat

Site 931Hole A:


Hole B:grape.datindex.datmagsus.datnatgam.dat

Hole C:grape.datmagsus.datnatgam.dat

Site 932Hole A:

grape.datmagsus.datnatgam.dat

Hole B:grape.datmagsus.datnatgam.dat

Site 933Hole A:


Site 934Hole A:



Site 935Hole A:

grape.dat

index.datmagsus.datnatgam.dat

Site 936Hole A:


Site 937Hole B:



Hole D:grape.datmagsus.datnatgam.dat

Site 938Hole A:



Site 939Hole A:


Hole B:grape.datindex.datmagsus.datnatgam.dat


Site 940Hole A:


Site 941Hole A:


Hole B:grape.datindex.dat

magsus.datnatgam.dat

Site 942Hole A:




Site 943Hole A:


Site 944Hole A:




Hole D:grape.datmagsus.datnatgam.dat

Site 945Hole A:


Site 946Hole A:


ACKNOWLEDGMENTS

We thank the SEDCO and ODP shipboard personnel, who helped make Leg 155such a success, and the Brazilian government for permitting us to drill Site 942. Wethank PETROBRAS and the Brazilian navy for their assistance.

Documents

Ocean Drilling Program Initial Reports Volume 155