Paleoenvironment evolution of the East Philippine Sea recorded in the new-type ferromanganese crust since the terminal Late Miocene |
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作者单位: | XU ZhaoKai(Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071,China;Graduate University of Chinese Academy of Sciences, Beijing 100039, China) ;
LI AnChun(Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071,China) ;
JIANG FuQing(Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071,China) ;
LI TieGang(Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071,China) ;
MENG QingYong(Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071,China;Graduate University of Chinese Academy of Sciences, Beijing 100039, China) ;
JIN Ning(Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071,China;Graduate University of Chinese Academy of Sciences, Beijing 100039, China) ; |
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基金项目: | 国家自然科学基金;国家自然科学基金 |
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摘 要: | From systemic research of microstructure, geochemistry, uranium-series and 10Be isotope dating on a new-type deepwater ferromanganese crust from the East Philippine Sea, the paleoenvironment evolu-tion of the target area since the terminal Late Miocene was recovered. The vertical section changes of microstructure and chemical composition are consistent in the studied crust, which indicate three major accretion periods and corresponding paleoenvironment evolution of the crust. The bottom crust zone was formed in the terminal Late Miocene (5.6 Ma) with loose microstructure, high detritus content and high growth rate. Reductions of mineral element content, accretion rate and positive Ce-anomaly degree at 4.6 Ma indicate temporal warming, which went against the crust accretion and finally formed an accretion gap in the terminal Middle Pliocene (2.8―2.7 Ma). The more active Antarctic bottom sea-waters in the Late Pliocene (2.7 Ma) facilitated the fast transfer to the top pure crust zone. Hereafter, with the further apart of volcanic source and the keeping increase of eolian material (1.0 Ma), although surrounding conditions were still favorable, mineral element content still shows an obvious reducing trend. It thereby offers new carrier and data for the unclear paleoceanographic research of the target area since the terminal Late Miocene.
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收稿时间: | 22 June 2006 |
修稿时间: | 8 January 2007 |
Paleoenvironment evolution of the East Philippine Sea recorded in the new-type ferromanganese crust since the terminal Late Miocene |
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Authors: | Xu ZhaoKai Li AnChun Jiang FuQing Li TieGang Meng QingYong Jin Ning |
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Institution: | 1. Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071,China;Graduate University of Chinese Academy of Sciences, Beijing 100039, China 2. Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071,China |
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Abstract: | From systemic research of microstructure, geochemistry, uranium-series and 10Be isotope dating on a new-type deepwater ferromanganese crust from the East Philippine Sea, the paleoenvironment evolution
of the target area since the terminal Late Miocene was recovered. The vertical section changes of microstructure and chemical
composition are consistent in the studied crust, which indicate three major accretion periods and corresponding paleoenvironment
evolution of the crust. The bottom crust zone was formed in the terminal Late Miocene (5.6 Ma) with loose microstructure,
high detritus content and high growth rate. Reductions of mineral element content, accretion rate and positive Ce-anomaly
degree at 4.6 Ma indicate temporal warming, which went against the crust accretion and finally formed an accretion gap in
the terminal Middle Pliocene (2.8–2.7 Ma). The more active Antarctic bottom seawaters in the Late Pliocene (2.7 Ma) facilitated
the fast transfer to the top pure crust zone. Hereafter, with the further apart of volcanic source and the keeping increase
of eolian material (1.0 Ma), although surrounding conditions were still favorable, mineral element content still shows an
obvious reducing trend. It thereby offers new carrier and data for the unclear paleoceanographic research of the target area
since the terminal Late Miocene.
Supported by the Key Program of the National Natural Science Foundation of China (Grant No. 90411014) and the National Natural
Science Foundation of China (Grant Nos. 40576032 and 40506016). |
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Keywords: | new-type ferromanganese crust record paleoenvironment evolution uranium-series dating 10Be isotope dating East Philippine Sea |
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