NDLI: Benthic foraminifera and bottom water evolution in the middle-southern Okinawa Trough during the last 18 ka

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Benthic foraminifera and bottom water evolution in the middle-southern Okinawa Trough during the last 18 ka

Content Provider	Springer Nature Link
Author	Li, Tiegang Xiang, Rong Sun, Rongtao Cao, Qiyuan
Copyright Year	2005
Abstract	A piston sediment core E017 from the middle-southern Okinawa Trough was investigated. A preliminary study of the deep-water evolution since 18 cal. ka BP was performed based on the quantitative census data of benthic foraminiferal fauna, together with planktonic foraminiferal oxygen and carbon isotope, AMS$^{14}$C dating, and the previous results achieved in the southern Okinawa Trough. The result shows that the benthic fauna was dominated by Bulimina aculeata (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-glacial period after 9.2 cal. ka BP. The benthic foraminifera accumulation rate (BFAR), paleoproductivity estimates and benthic foraminiferal assemblage conformably indicate that surface water paleoproductivity and organic matter flux during the glaciation-deglaciation were higher than those of the post-glacial period in the middle-southern Okinawa Trough, and gradually enhanced from the southern to the central Okinawa Trough during the glaciation-deglaciation, which could be caused by the discrepancy of the terrigenous nutrients supply. High abundances of E. exigua, an indicator of pulsed organic matter input, after 9.2 cal. ka BP may indicate that the intensity of seasonally 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 in the 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-glacial period is more active than the glaciation-deglaciation, which reflects that the evolution of the intermediate and deep waters of the northwestern Pacific during the last glaciation has no evident influence on the deep-water of the middle-southern Okinawa Trough. Additionally, the variations in agglutinated benthic foraminiferal abundance and other carbonate dissolution proxies indicate that carbonate dissolution gradually increased since the last 18 ka in the Okinawa Trough and rapidly enhanced at 9.2 cal. ka BP. The modern shallow carbonate lysocline could form at 3 cal. ka BP.
Starting Page	805
Ending Page	814
Page Count	10
File Format	PDF
ISSN	10069313
Journal	Science in China Series D: Earth Sciences
Volume Number	48
Issue Number	6
e-ISSN	18622801
Language	English
Publisher	Science in China Press
Publisher Date	2005-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	benthic foraminifera the Okinawa Trough deep-water evolution Geosciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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