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Changes and influencing factors in biogenic opal export productivity in the Bering Sea over the last 4.3 Ma: Evidence from the records at IODP Site U1340
Zhang, Qiang; Chen, Muhong; Zhang, Lanlan; Su, Xiang; Xiang, Rong; Zhang, Q (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou, Guangdong, Peoples R China.; Zhang, Q (reprint author), Univ Chinese Acad Sci, Beijing, Peoples R China.
2016
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
Volume121Issue:8Pages:5789-5804
AbstractWe reconstructed changes in biogenic opal export productivity (BOEP) in the southern Bering Sea (BS) over the last similar to 4.3 Ma, based on mass accumulation rate (MAR) of biogenic opal from Integrated Ocean Drilling Program (IODP) Site U1340. The results show that the BOEP in the BS was high and variable between similar to 4.3 and similar to 1.9 Ma, extremely low and relatively stable from similar to 1.9 to similar to 1.1 Ma, and then fluctuated frequently (generally high during interglacials and low during glacials) during the last similar to 1.1 Ma. One interval of enhanced BOEP from similar to 4.3 to similar to 3.2 Ma is a response to the Late Miocene-Early Pliocene "Biogenic Bloom Event.'' Another interval from similar to 2.8 to similar to 1.9 Ma correlates with global opal burial shifting from high-latitude oceans to upwelling-influenced regions following the intensification of the Northern Hemisphere Glaciation (NHG). Whereas, the increase in BS opal export productivity during the last similar to 1.1 Ma tends to be a "local'' phenomenon. Overall, the BOEP shows a similar trend and good correspondence to the input of the Alaskan Stream (AS), which can be traced using the Na2O/K2O ratio. We thus conclude that the AS may be the direct, and primary factor on BOEP variability in the BS during the last similar to 4.3 Ma. In addition, although the poor correlation between opal MAR and volcanic glass suggests that BOEP variability was not controlled by longterm variations in the volcanism or ash abundance, increased ash abundance indicated by high contents of volcanic glasses was also a possible reason for enhanced BOEP during the period from similar to 4.3 to similar to 3.2 Ma and the last similar to 0.5 Ma.
Department[Zhang, Qiang; Chen, Muhong; Zhang, Lanlan; Su, Xiang; Xiang, Rong] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou, Guangdong, Peoples R China; [Zhang, Qiang] Univ Chinese Acad Sci, Beijing, Peoples R China ; 边缘海地质
Subject AreaOceanography
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/15326
Collection中科院边缘海地质重点实验室
Corresponding AuthorZhang, Q (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou, Guangdong, Peoples R China.; Zhang, Q (reprint author), Univ Chinese Acad Sci, Beijing, Peoples R China.
Recommended Citation
GB/T 7714
Zhang, Qiang,Chen, Muhong,Zhang, Lanlan,et al. Changes and influencing factors in biogenic opal export productivity in the Bering Sea over the last 4.3 Ma: Evidence from the records at IODP Site U1340[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2016,121(8):5789-5804.
APA Zhang, Qiang.,Chen, Muhong.,Zhang, Lanlan.,Su, Xiang.,Xiang, Rong.,...&Zhang, Q .(2016).Changes and influencing factors in biogenic opal export productivity in the Bering Sea over the last 4.3 Ma: Evidence from the records at IODP Site U1340.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,121(8),5789-5804.
MLA Zhang, Qiang,et al."Changes and influencing factors in biogenic opal export productivity in the Bering Sea over the last 4.3 Ma: Evidence from the records at IODP Site U1340".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 121.8(2016):5789-5804.
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