A revised Plio-Pleistocene age model and paleoceanography of the northeastern Caribbean Sea: IODP Site U1396 off Montserrat, Lesser Antilles

Andrew J. Fraass; Deborah Wall-Palmer; R. Mark LeckieRobert G. HatfieldStephen J. BurnsAnne Le FriantOsamu IshizukaMohammed AljahdaliMartin JutzelerMichael Martínez-ColónMartin PalmerPeter J. Talling

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A revised Plio-Pleistocene age model and paleoceanography of the northeastern Caribbean Sea: IODP Site U1396 off Montserrat, Lesser Antilles

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Site U1396 was piston cored as a part of Integrated Ocean Drilling Project Expedition 340 to establish a long record for Lesser Antilles volcanism. A ~150 m sediment succession was recovered from three holes on a bathymetric high ~33 km southwest of Montserrat. A series of shipboard and newly-generated chronostratigraphic tools (biostratigraphy, magnetostratigraphy, astrochronology, and stable isotope chemostratigraphy) were employed to generate an integrated age model. Two possible chronostratigraphic interpreta-tions for the Brunhes chron are presented, with hypotheses to explain the discrepancies seen between this study and Wall-Palmer et al. (2014). The recent Wade et al. (2011) planktic foraminiferal biostratigraphic calibration is tested, revealing good agreement between primary datums observed at Site U1396 and calibrated ages, but significant mismatches for some secondary datums. Sedimentation rates are calculated, both including and excluding the contribution of discrete volcanic sediment layers within the succession. Rates are found to be 'pulsed' or highly variable within the Pliocene interval, declining through the 1.5-2.4 Ma interval, and then lower through the Pleistocene. Different explanations for the trends in the sedimentation rates are discussed, including orbitally-forced biogenic production spikes, elevated contributions of cryptotephra (dispersed ash), and changes in bottom water sources and flow rates with increased winnowing in the area of Site U1396 into the Pleistocene.

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《Stratigraphy》 |2016年第3期|183-203|共21页
作者
Andrew J. Fraass; Deborah Wall-Palmer; R. Mark LeckieRobert G. HatfieldStephen J. BurnsAnne Le FriantOsamu IshizukaMohammed AljahdaliMartin JutzelerMichael Martínez-ColónMartin PalmerPeter J. Talling;
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University of Massachusetts, Department of Geosciences, 233 Morrill Science Center, 611 North Pleasant St., Amherst, MA 01003, USA;

Plymouth University, School of Geography, Earth, and Environmental Sciences, Plymouth, UK;

College of Earth, Ocean, and Atmospheric Sciences, 104 CEOAS Admin Building, Oregon State University, Corvallis, OR 97331, USAInstitut de Physique du Globe de Paris, Sorbonne Paris Cité and CNRS UMR 7154, Paris, FranceGeological Survey of Japan (AIST), Ibaraki, JapanDepartment of Earth, Ocean and Atmospheric Sciences, Florida State University, 108 Carraway Building, Tallahassee FL 32306-0001Centre of Excellence in Ore Deposits (CODES) and School of Earth Sciences, University of Tasmania, Hobart TAS 7001College ofMarine Science, University of South Florida, St. Petersburg, 140 7th Avenue South, St. Petersburg FL 33701, USASchool of Ocean and Earth Science, National Oceanography Centre, University of Southampton, European Way, Southampton SO14 3ZH, UK;

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正文语种英语
中图分类地质学;
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piston cored; long record; sediment succession;

A revised Plio-Pleistocene age model and paleoceanography of the northeastern Caribbean Sea: IODP Site U1396 off Montserrat, Lesser Antilles

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