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

journal contribution
posted on 2023-05-19, 04:48 authored by Fraass, AJ, Wall-Palmer, D, Leckie, RM, Hatfield, RG, Burns, SJ, Le Friant, A, Ishizuka, O, Aljahdali, M, Martin JutzelerMartin Jutzeler, Martinez-Colon, M, Palmer, M, Talling, PJ
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 interpretations 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.

History

Publication title

Stratigraphy

Volume

13

Pagination

183-203

ISSN

1547-139X

Department/School

School of Natural Sciences

Publisher

Micropaleontology Press

Place of publication

United States

Rights statement

COPYRIGHT STATEMENT: Micropaleontology Project, Inc. holds copyright to submitted manuscripts in complete published form only. In allowing their work to be published by the Project, the authors accept that their original information, data, illustrations, and interpretations may be permitted by the publisher to be reproduced for scholarly use, provided clear acknowledgment of the authors is given.

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Expanding knowledge in the earth sciences

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