Paleoenvironments Recorded in a New-Type Ferromanganese Crust fromthe East Philippine Sea

作     者：徐兆凯 李安春 蒋富清 李铁刚 

作者机构：Institute of Oceanology Chinese Academy of Sciences Qingdao266071 ChinaPostgraduate School of Chinese Academy of Sciences Beijing100039 China Institute of Oceanology Chinese Academy of Sciences Qingdao266071 China 

出 版 物：《Journal of China University of Geosciences》 (中国地质大学学报（英文版）)

年 卷 期：2006年第17卷第1期

页      面：34-42页

核心收录：

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 0708[理学-地球物理学] 0704[理学-天文学] 

基　　金：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) 

主　　题：new-type ferromanganese crust paleoenvironment geochemistry East Philippine Sea 

摘      要：We attempt to recover the paleocnvironments recorded in the accretion of a typical newtype 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 （ICPMS）, three major accretion periods and corresponding paleocnvironments 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.