Abstract The Ocean Drilling Program (ODP) has now completed 29 internationally staffed expeditions and five years of scientific ocean drilling. JOIDES Resolution, the scientific drillship of ODP, has travelled in the Atlantic, eastern and northwest Pacific, and Indian oceans, including high latitude zones bordering East and West Antarctica, and the Mediterranean, Caribbean, Weddell, Sulu, Celebes, Philippine and Japan seas, in search of answers to important scientific problems designated by the Joint Oceanographic Institutions for Deep Earth Sampling (JOIDES). These scientific objectives relate to the tectonic evolution of passive and active continental margins, origin and evolution of oceanic crust, origin and evolution of marineedimentary sequences, and paleoceanography. In addition, ODP has continued modification and reliability of existing coring systems as well as made numerous advances in technology to improve the capture of scientific information. During its fifth year, the ODP has completed pioneering exploration in the Northwest Pacific Ocean and adjacent seas. Leg 124E, in the Philippine Sea, was our first cruise dedicated to engineering development. Legs 125 and 126 were a two cruise effort designed to study, amongst other important problems, the geological processes involved in thedevelopment of the Bonin and Marianas arcs. Legs 127 and 128 were dedicated to study the tectonics and sedimentation history of the Japan Sea. Leg 129 commenced after a dry dock period of JOIDESResolution, to study the oldest Pacific crust in Pigafetta and east Mariana basins in the Western Pacific. This paper focuses on ODP's scientific successes of five years of scientific ocean drilling and discusses areas of future study. Introduction The Ocean Drilling Program, an international basic research program of scientific ocean drilling, is the successor program to the Deep Sea Drilling Project (DSDP) with Texas A&M University as the science operator. The mission of ODP is to learn how Earth has evolved with time. To do this, sediment and hard rock samples are retrieved from beneath the deep-sea floor to study evolution of ocean basins, evolution of prehistoric life, evolution of past ocean current and paleoclimates. ODP is funded by the U.S. National Science Foundation with major contributions from 18 non-U.S. countries. This international partnership is called the Joint Oceanographic Institutions for Deep Earth Sampling (JOIDES) ODP commenced its field operations with a shakedown and sea trials cruise in January 1985 in the Gulf of Mexico1. About every two months since that time, an internationally staffed expedition of our drilling research vessel, the SEDCOIBP 471, better known to the scientific community as the JOIDES Resolution (Figure 1), has taken place in very remote but geologically important areas of the world's oceans. Each expedition carries a scientific and technical complement of 51 persons as well as a ship's crew and drilling complement of about 60 persons. The ship, as of cruise 129 (January 1990), has operated at 175 sites in the north Atlantic Ocean, in the eastern and northwest Pacific Ocean, in the Weddell Sea and Prydz Bay off Antarctica and in the Indian Ocean (Figure 2).

During ODP Leg 103, serpentinized peridotite (clinopyroxene-spinel harzburgite) was cored within the basement approximatively at the boundary between the North Atlantic oceanic curst to the west, and the thinned continental crust of the Galicia passive margin (Spain) to the east. The exposure of mantle derived peridotite on the seafloor occurred at the end of the period of rifting, roughly 110 Ma ago. Ductile shear zones observed in the cored peridotite are consistent with movements along a deep low-angle, normal fault rooted within the upper mantle and dipping eastward, beneath the Galicia margin. To explain the tectonic denudation of the mantle at the ocean-continent boundary, we use a non-uniform stretching model for the lithosphere, set up from the Wernicke's model (1985).

Combined analyses of bathymetry, piston cores, 3.5-kHz echograms, and seismic reflection data reveal that sedimentation patterns in the eastern Sunda forearc are strongly influenced by vigorous deep- and bottom-water circulation. The affected region is located at the intersection of the Sumba Ridge and the Sawu-Timor Ridge, which together form a barrier to the outflow of Pacific Ocean Deep Water from the Sawu Sea to the eastern Indian Ocean. Bottom currents associated with the outflow have eroded a gap in the sill at a water depth of 1150 m, between the islands of Sumba and Sawu. Southwest of the gap, the widespread exposure of well-consolidated, middle Miocene to Pliocene foraminiferal chalks and oozes along the Sumba Ridge suggests that up to 1 km of overburden has been removed by the deep (1–1.5 km) currents. The eroded sediments have been subsequently deposited as muddy contourites in a thick (> 1 km) sediment drift in the adjacent Sumba Basin. The drift consists of an elongated mound composed of reworked calcareous ooze and is bounded by moat-like channels. The influence of contour currents on trench-slope sedimentation can be significant and should be considered during studies of modern forearc systems and ancient subduction complexes on land.

Duennebier, F. K., Stephen, R., Gettrust, J. R, et al., Init. Repts. DSDP, 88: Washington (U.S. Govt. Printing Office). 2 Addresses: (Shipboard Scientific Parties) Frederick K. Duennebier (Co-Chief Scientist), Hawaii Institute of Geophysics, University of Hawaii at Manoa, 2525 Correa Rd., Honolulu, HI 96822; Ralph A. Stephen, (Co-Chief Scientist), Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543; Joseph Gettrust (Co-Chief Scientist), Naval Ocean Research and Development Activity, NORDA Code 253, NSTL Station, MS 39529; Felix Avedik, Centre Océanologique de Bretagne, B.P. 337, 29273 Brest Cedex, France; J. Alan Ballard, Naval Ocean Research and Development Activity, NORDA Code 543, NSTL Station, MS 39529; L. Dale Bibee, School of Oceanography, Oregon State University, Corvallis, OR 97331; Michael Fehler, School of Oceanography, Oregon State University, Corvallis, OR 97331 (present address: Earth and Space Sciences Division, Los Alamos National Laboratory, Los Alamos, NM 87545); Anton Inderbitzen, Office of Scientific Ocean Drilling, National Science Foundation, 1800 G Street NW, Washington, D.C. 20550; Randall Jacobsen, School of Oceanography, Oregon State University, Corvallis, OR 97331; Georges Pascal, Université de Bretagne Occidentale, Avenue le Gorgeu, 29283 Brest Cedex, France; (Meyer) Ocean Drilling Program, 500 University Drive West, Texas A&M University, College Station, TX 77843; (Natland) Deep Sea Drilling Project (A-031), Scripps Institution of Oceanography, La Jolla, CA 92093. Total length of cored section (m): 24.5

La campaña oceanográfica 103 del Ocean Drilling Program (ODP) ha estado dedicada a dilucidar la evolución tectónica y sedimentación del Margen Atlántico-Ibérico. Se realizaron un total de 14 sondeos., en cinco puntos de posicionamiento, sobre el extremo más profundo del margen; al S del Banco de Galicia. Los resultados obtenidos revelan que previamente al inicio de la expansión oceánica entre Terranova e Iberia ocurrió una historia compleja de distensión cortical, fracturación y subsidencia asociadas. Los resultados fundamentales son los siguientes: 1) Carbonatos de plataforma marina somera, de edad Jurásico superior-Cretáceo basal constituyen los primeros depósitos mesozóicos en ese ámbito del margen y dan lugar a un reflector sísmico considerado interiormente como basamento, 2) El hundimiento de la plataforma, fallamiento y basculamiento de los bloques ocurre desde 25 m.a. antes de iniciarse la acreción oceánica. 3) En el límite entre corteza oceánica-corteza continental se ubica una cresta constituida por peridotitas serpetinizadas. 4) El reflector sísmico «S», generalmente considerado como el límite dúctil-frágil en la corteza continental, corresponde realmente a la base de los depósitos sinrift.

Research Article| December 01, 1986 Deformation and sedimentation along a developing terrane suture: Eastern Sunda forearc, Indonesia Donald L. Reed; Donald L. Reed 1Earth Sciences Board, University of California, Santa Cruz, California 95064 Search for other works by this author on: GSW Google Scholar Eli A. Silver; Eli A. Silver 1Earth Sciences Board, University of California, Santa Cruz, California 95064 Search for other works by this author on: GSW Google Scholar Hardi Prasetyo; Hardi Prasetyo 1Earth Sciences Board, University of California, Santa Cruz, California 95064 Search for other works by this author on: GSW Google Scholar Audrey W. Meyer Audrey W. Meyer 2Ocean Drilling Program, Texas A&M University, College Station, Texas 77843 Search for other works by this author on: GSW Google Scholar Geology (1986) 14 (12): 1000–1003. https://doi.org/10.1130/0091-7613(1986)14<1000:DASAAD>2.0.CO;2 Article history first online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Donald L. Reed, Eli A. Silver, Hardi Prasetyo, Audrey W. Meyer; Deformation and sedimentation along a developing terrane suture: Eastern Sunda forearc, Indonesia. Geology 1986;; 14 (12): 1000–1003. doi: https://doi.org/10.1130/0091-7613(1986)14<1000:DASAAD>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The collision of the eastern Sunda arc with northwest Australia has resulted in the development of a suture between the Sumba ridge and Sawu-Timor terrenes along a zone of intraforearc convergence. The developing suture varies from the low-angle Sawu thrust, with attendant mud diapirs in the Sumba basin, to high-angle reverse faults near a basement: high of the underthrust Sumba ridge terrane. Bottom currents, associated with the flow of Pacific Ocean deep water into the Indian Ocean, have eroded the terrenes and subsequently deposited the detritus in an assemblage of contourites along the suture. This study reveals the high structural variability of a terrane suture and the oceanographic influence on trie deposition of overlap assemblages. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

These explanatory notes are intended to help the reader understand the Leg 96 site chapters that follow.Although the Leg 96 shipboard party by and large followed standard Deep Sea