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GEOPHYSICAL RESEARCH LETTERS,
VOL. 32,
L15609,
4 PP., 2005
doi:10.1029/2005GL023139
Enhanced deepwater circulation and shift of sedimentary organic matter oxidation pathway in the Okinawa Trough since the Holocene
Research Center for Environmental Changes, Academia Sinica, Taipei, Taiwan
Institute of Hydrological Science, National Central University, Chung-Li, Taiwan
Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan
Research Center for Environmental Changes, Academia Sinica, Taipei, Taiwan
Department of Geosciences, National Taiwan University, Taipei, Taiwan
Research Center for Environmental Changes, Academia Sinica, Taipei, Taiwan
Department of Geosciences, National Taiwan University, Taipei, Taiwan
High-resolution biogeochemical and magnetic property analyses of a 20-kyr sediment core in the Okinawa Trough revealed a significant upward decrease in total sulfur content (TS) at around 10 cal ka BP, which coincides with a transformation from foliation to anomalous sedimentary magnetic fabric, which indicates an enhancement of deepwater circulation. Synchronous change in biogeochemical and magnetic properties in sediments was likely triggered by the intensified Kuroshio Current, which strengthened surface water productivity and the relative input of marine organics to the sediments. However, this event did not promote sedimentary sulfur burial; instead, the synchronously enhanced deepwater circulation switched the organic carbon oxidation pathway from sulfate reduction to aerobic respiration which resulted in TS-depleted sediments.
Received 4 April 2005; accepted 21 July 2005; published 12 August 2005.
Citation: (2005), Enhanced deepwater circulation and shift of sedimentary organic matter oxidation pathway in the Okinawa Trough since the Holocene, Geophys. Res. Lett., 32, L15609, doi:10.1029/2005GL023139.
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