| Paleoenvironments Recorded in a New-Type Ferromanganese Crust from the East Philippine Sea |
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| 作者姓名： | 徐兆凯 李安春 蒋富清 李铁刚 |
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| 作者单位： | Institute of Oceanology Chinese Academy of Sciences Qingdao266071 China，Postgraduate School of Chinese Academy of Sciences Beijing100039 China，Institute of Oceanology Chinese Academy of Sciences Qingdao266071 China，Institute of Oceanology Chinese Academy of Sciences Qingdao266071 China，Institute of Oceanology Chinese Academy of Sciences Qingdao266071 China |
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| 基金项目： | This paperis supported bythe Pilot Project of the Knowledge InnovationProgramof Chinese Academy of Sciences (No . KZCX3-SW-223)，theNational Natural Science Foundation of China ( Nos . 40506016 and40576032) . |
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| 摘 要： | INTRODUCTIONHydrogenetic marine ferromanganese crusts havereceived much attention over the past several dec-ades ,not only as potential mineral resources enrichedin Mn,Co ,Cu, Ni ,and Pt ( Manhei m,1986) but al-so as potential paleoceanographic records during theirgrowth ( Banakar et al ., 2003 ; Mc Murtry et al .,1994 ; Hein et al .,1992) .Former research has demonstrated that varia-tions in the chemical composition of seamount ferro-manganese crusts canreflect theinfluence of changin…
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| 关 键 词： | 古环境 菲律宾 地球化学 锰铁 地壳 |
| 收稿时间： | 2005-07-30 |
| 修稿时间： | 2005-12-10 |
Paleoenvironments Recorded in a New-Type Ferromanganese Crust from the East Philippine Sea |
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| Xu Zhaokai,Li Anchun,Jiang Fuqing,Li Tiegang.Paleoenvironments Recorded in a New-Type Ferromanganese Crust from the East Philippine Sea[J].Journal of China University of Geosciences,2006,17(1):34-42. |
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| Authors: | Xu Zhaokai Li Anchun Jiang Fuqing Li Tiegang |
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| Institution: | 1. Harquail School of Earth Sciences and Mineral Exploration Research Centre, Laurentian University, 935 Ramsey Lake Road, Sudbury, Ontario P3E2C6, Canada;2. School of Earth Sciences, The University of Melbourne, Parkville, Australia;3. iCRAG, Department of Geology, School of Natural Sciences, Trinity College Dublin, Dublin 2, Ireland;1. Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada;2. Sanya Institute of Deep-Sea Science and Engineering, Chinese Academy of Science, Sanya 572000, China |
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| Abstract: | We attempt to recover the paleoenvironments recorded in the accretion of a typical new-type hydrogenetic ferromanganese crust from the deep water areas of the East Philippine Sea. From detailed geochemical and U-series chronological studies, analysis of major and minor elements performed by X-ray fluorescence spectrometry (XRF) and inductively coupled plasma-mass spectrometer (ICP-MS), three major accretion periods and corresponding paleoenvironments can be ascertained. The first period is a faster accretion period in the terminal Late Miocene to the Early Pliocene with looser structure and higher volcanic detritus content, corresponding to the active Antarctic bottom waters and depressed temperature from the intermediate Middle Miocene to the Early Pliocene. The second period is a pulse of pelagic clay deposition at the Early to Middle Pliocene, reflecting the shrinkage of the Antarctic bottom waters and the global temperature elevation of this period. The third period is a slower accretion period from the Middle Pliocene, which indicates the more violent activity of Antarctic bottom waters once again and more depressed temperature than the first period, facilitating the accretion of a more compact and pure ferromanganese zone. The paleoceanographic histories of these studied areas had not been made clear in previous research. |
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| Keywords: | new-type ferromanganese crust paleoenvironment geochemistry East Philippine Sea |
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