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Early Sinking History of Ninetyeast Ridge, Northeastern Indian Ocean
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1974
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EngineeringOceanographyMarine Geophysical DataNinetyeast RidgeEarth ScienceRegional GeologySeafloor MorphologyGeological DataContinental ShelfGeological EngineeringMarine GeologyNortheastern Indian OceanGeographyGeologyEngineering GeologyTectonicsStructural GeologyEarly Sinking HistoryEarth SciencesGsa Bulletin 1974
Research Article| August 01, 1974 Early Sinking History of Ninetyeast Ridge, Northeastern Indian Ocean ANTHONY C. PIMM; ANTHONY C. PIMM 1BP Alaska Exploration Inc., Pacific Insurance Building, 100 Pine Street, San Francisco, California 94111 Search for other works by this author on: GSW Google Scholar BRIAN McGOWRAN; BRIAN McGOWRAN 2School of Geology, University of Adelaide, Adelaide, South Australia 5001 Search for other works by this author on: GSW Google Scholar STEFAN GARTNER STEFAN GARTNER 3Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida 33149 Search for other works by this author on: GSW Google Scholar Author and Article Information ANTHONY C. PIMM 1BP Alaska Exploration Inc., Pacific Insurance Building, 100 Pine Street, San Francisco, California 94111 BRIAN McGOWRAN 2School of Geology, University of Adelaide, Adelaide, South Australia 5001 STEFAN GARTNER 3Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida 33149 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1974) 85 (8): 1219–1224. https://doi.org/10.1130/0016-7606(1974)85<1219:ESHONR>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 Email Tools Icon Tools Get Permissions Search Site Citation ANTHONY C. PIMM, BRIAN McGOWRAN, STEFAN GARTNER; Early Sinking History of Ninetyeast Ridge, Northeastern Indian Ocean. GSA Bulletin 1974;; 85 (8): 1219–1224. doi: https://doi.org/10.1130/0016-7606(1974)85<1219:ESHONR>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 SocietyGSA Bulletin Search Advanced Search Abstract Three sites were drilled on Ninetyeast Ridge. They penetrated a sequence of pelagic calcareous oozes underlain by a shallow-water sequence whose ages are Paleocene at Site 214, late Maastrichtian at 216, and late Campanian at 217. At Site 214, the southernmost drilled, a nonmarine sequence that consists of volcaniclastic sediments and thin lignite beds of Paleocene age was penetrated above the basement rocks. At Site 216, volcaniclastic material in the basal sediments is mostly reworked. Both Sites 214 and 216 bottomed in probable subaerial lava flows. Site 217, the northernmost drilled, bottomed in a strongly dolomitized sequence interpreted as a lagoonal reef facies that was subjected periodically to hypersaline conditions and, sometimes, actual emergence.There is excellent correlation between volcanic, sedimentary, and paleontological data: all evidence indicates rapid sinking. The diachronous facies change (older and deeper to the north) is consistent with the notion of rapid northward movement during sinking, and there is some biogeographic evidence to support this. 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.