Arid
DOI10.1007/s11001-007-9024-7
Fine-scale compositional variations in a Co-rich Mn crust from the Marcus-Wake Seamount cluster in the western Pacific based on electron microprobe analysis (EMPA)
Ren, Xiangwen; Glasby, G. P.; Liu, Jihua; Shi, Xuefa; Yin, Jingwu
通讯作者Shi, Xuefa
来源期刊MARINE GEOPHYSICAL RESEARCH
ISSN0025-3235
EISSN1573-0581
出版年2007
卷号28期号:2页码:165-182
英文摘要

The internal structure and composition of a 37-mm-thick Co-rich Mn crust from the Lamont Guyot in the Marcus-Wake Seamount cluster have been studied in detail by means of electron-probe microanalysis (EPMA). 184 point analyses for 16 elements were carried out at an average spacing of 0.20 mm and each point was dated using the Co-geochronometer method. Two types of variation in composition were observed in the crust: long-term trends and short-term erratic variations. The long-term trends were identified using the fifth order polynomial. Mn and Ni were shown to increase in concentration from 23.3 Ma to a maximum at about 20 Ma and then decline steadily to the Present, whereas Fe, P and Si showed the opposite trend. By contrast, Co displayed a double humped pattern with maxima at about 19 Ma and 3.5 Ma and minima at 23.3 Ma, about 11 Ma and at Present. The long-term trends in element concentrations in the crust lead us to suggest that much of the Fe in western Pacific Ocean ferromanganese crusts is aeolian in origin and derived from the deserts of central Asia. Cooling of the Asian mainland at about 20 Ma led to an increase in the flux of Fe to the oceans. This was supplemented by an additional input of Fe into the crusts as a consequence of the dissolution of biogenic CaCO3 tests at 4.5-10.5 Ma. For the short-term erratic variations, three periods of 0.61, 0.96 and 1.65 m.y. were identified by spectral analysis. The second harmonics of these periods are 1.22, 1.92 and 3.30 m.y., which may correspond to the highest-order periods for eccentricity of 1.31, 2.04 and 3.47 m.y. This suggests the possibility that the high-frequency oscillations of the time series data are linked to climatic changes controlled by the highest-order periods of the Milankovitch cycles.


英文关键词Co-geochronometer Co-rich manganese crust electron microprobe analysis Lamont Guyot Marcus-Wake Seamount cluster
类型Article
语种英语
国家Peoples R China
收录类别SCI-E
WOS记录号WOS:000248425000009
WOS关键词CENTRAL NORTH PACIFIC ; FERROMANGANESE CRUSTS ; RARE-EARTH ; DEEP-WATER ; MANGANESE NODULES ; MINOR ELEMENTS ; SEA-FLOOR ; OCEAN ; SEAWATER ; GEOCHEMISTRY
WOS类目Geochemistry & Geophysics ; Oceanography
WOS研究方向Geochemistry & Geophysics ; Oceanography
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/155385
作者单位(1)State Ocean Adm, Inst Oceanog 1, Key Lab Marine Sedimentol & Environm Geol, Qingdao 266061, Peoples R China;(2)China Univ Geosci, Geol Lab Ctr, Beijing 100083, Peoples R China
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Ren, Xiangwen,Glasby, G. P.,Liu, Jihua,et al. Fine-scale compositional variations in a Co-rich Mn crust from the Marcus-Wake Seamount cluster in the western Pacific based on electron microprobe analysis (EMPA)[J],2007,28(2):165-182.
APA Ren, Xiangwen,Glasby, G. P.,Liu, Jihua,Shi, Xuefa,&Yin, Jingwu.(2007).Fine-scale compositional variations in a Co-rich Mn crust from the Marcus-Wake Seamount cluster in the western Pacific based on electron microprobe analysis (EMPA).MARINE GEOPHYSICAL RESEARCH,28(2),165-182.
MLA Ren, Xiangwen,et al."Fine-scale compositional variations in a Co-rich Mn crust from the Marcus-Wake Seamount cluster in the western Pacific based on electron microprobe analysis (EMPA)".MARINE GEOPHYSICAL RESEARCH 28.2(2007):165-182.
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