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Quaternary primary productivity in porcupine seabight,NE North Atlantic

Science China Earth Sciences 2012年第2期55卷 306-314页

作者： LI XiangHui Akihiro KANO CHEN YunHua Chiduru TAKASHIMA XU WenLi XU BaoLiang WANG RuiJian State Key Laboratory of Enhanced Oil Recovery Institute of Petroleum Exploration&DevelopmentChina National Petroleum CorporationBeijing 100083China Graduate School of Social and Cultural Studies Kyushu University4-2-1 RopponmatsuFukuoka 810-8560Japan School of Earth Sciences and Engineering Nanjing UniversityNanjing 210093China Geological Science Research Institute of Shengli Oilfield SINOPECDongying 257015China Environment Studies Faculty of Culture and EducationSaga University1 Honjo-machiSaga 840-8502Japan Institute of Sedimentary Geology Chengdu University of TechnologyChengdu 610059China Sichuan Research Centre Bureau of Geophysical Prospecting of China National Petroleum CorporationChengdu 610051China State Key Laboratory of Marine Geology Tongji UniversityShanghai 200092China

Biogenic opal and calcium carbonate contents in the Quaternary fine-grained sediments in the deep sea coral mound area (Hole U1317E and Hole U1318B drilled by IODP Expedition 307) in porcupine seabight, southwest off Ireland, were measured to estimate the primary productivity (Pp) of the surface seawater in NE Atlantic. The results from the two holes commonly show relatively high Pp values of 10-30 g cm-2 ky-1, having stratigraphic cyclicity reversely correlated with the δ13C profile. The high Pp could be attributed to the oceanic setting controlled by the Eastern North Atlantic (Central) Water and Shelf Edge Current, which have been strongly influenced by the obliquity forcing of the Milankovitch cycle. A positive covariance was observed between high Pp and the mound development in U1317E, implying that the organic matter was the principal food source for the mound coral community. It is proposed that the pelagic marl matrix of the mound sediments provides information of the surface water productivity that is useful for reconstructing the paleoceanography and the paleoclimate in the NW Atlantic.

关键词： primary productivity biogenic opal calcium carbonate Quaternary IODP 307 porcupine seabight North Atlantic

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