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Benthic foraminifera and bottom water evolution in themiddle-southern Okinawa Trough during the last 1. ka

Science china Earth Sciences 2005年第6期48卷 805-814页

作者： li tiegang1. xiang rong1.2,{1., chinese academy of Sciences, qingdao 266071. china 2. College of Geosciences, Ocean University of china, qingdao 266003, china Correspondence should be addressed to li tiegang 1. institute of {1. Chinese Academy of Sciences 266071 Qingdao China 2. College of Geosciences Ocean University of China 266003 Qingdao China

A piston sediment core E01. from the middle-southern Okinawa Trough was investigated. A preliminary study of the deep-water evolution since 1. cal. ka BP was performed basedon the quantitative census data of benthic foraminiferal fauna, together with planktonic foraminiferal oxygen and carbon isotope, AMS1.C dating, and the previous results achieved in thesouthern Okinawa Trough. The result shows that the benthic fauna was dominated by Buliminaaculeata (d′Orbigny), Uvigerina peregrina (Cushman), Hispid Uvigerina and Uvigerina dirupta(Todd) during the glaciation-deglaciation before 9.2 cal. ka BP, while Epistominella exigua(Brady), Pullenia bulloides (d′Orbigny), Cibicidoides hyalina (Hofker), Sphaeroidina bulloides(d’Orbigny) and Globocassidulina subglobosa (Brady) predominated the fauna in the post-glaciaperiod after 9.2 cal. ka BP. The benthic foraminifera accumulation rate (BFAR), paleoproductivityestimates and benthic foraminiferal assemblage conformably indicate that surface water paleoproductivity and organic matter flux during the glaciation-deglaciation were higher than those othe post-glacial period in the middle-southern Okinawa Trough, and gradually enhanced from thesouthern to the central Okinawa Trough during the glaciation-deglaciation, which could becaused by the discrepancy of the terrigenous nutrients supply. High abundances of E. exigua, anindicator of pulsed organic matter input, after 9.2 cal. ka BP may indicate that the intensity oseasonally riverine pulsed flux during the post-glacial period was stronger than that of the glaciation-deglaciation period, and the seasonal influx in the central trough might be stronger than inthe south. The temporal distributions of the typical species indicating bottom water oxygen content and ventilation condition show that the ventilation of the bottom water during the post-glaciaperiod is more active than the glaciation-deglaciation, which reflects that the evolution of the intermediate and deep waters of the n

关键词： benthic foraminifera, the Okinawa Trough, deep-water evolution.

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