Quaternary primary productivity in Porcupine Seabight,NE North Atlantic  

作　　者：LI XiangHui Akihiro KANO CHEN YunHua Chiduru TAKASHIMA XU WenLi XU BaoLiang WANG RuiJian 

机构地区：[1]State Key Laboratory of Enhanced Oil Recovery,Institute of Petroleum Exploration&Development,China National Petroleum Corporation,Beijing 100083,China [2]Graduate School of Social and Cultural Studies,Kyushu University,4-2-1 Ropponmatsu,Fukuoka 810-8560,Japan [3]School of Earth Sciences and Engineering,Nanjing University,Nanjing 210093,China [4]Geological Science Research Institute of Shengli Oilfield,SINOPEC,Dongying 257015,China [5]Environment Studies,Faculty of Culture and Education,Saga University,1 Honjo-machi,Saga 840-8502,Japan [6]Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China [7]Sichuan Research Centre,Bureau of Geophysical Prospecting of China National Petroleum Corporation,Chengdu 610051,China [8]State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China

出　　处：《Science China Earth Sciences》2012年第2期306-314,共9页中国科学（地球科学英文版）

基　　金：supported by National Natural Science Foundation of China (Grant Nos. 40772074, 40643017);the Japan Agency for Marine-Earth Science and Technology;partly by the Center for Advanced Marine Core Research, Kochi University

摘　　要：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.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 

分 类 号：P534.63[天文地球—第四纪地质学] Q178.53[天文地球—古生物学与地层学]