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题名: Noble gases isotopic compositions and sources of cobalt-rich crusts from west Pacific Ocean seamounts
作者: Sun XiaoMing ; Xue Ting ; He GaoWen ; Ye XianRen ; Zhang Mei ; Lu HongFeng ; Wang ShengWei
刊名: ACTA PETROLOGICA SINICA
出版日期: 2006
卷号: 22, 期号:9, 页码:2331-2340
关键词: noble gases ; isotopic compositions ; genesis ; cobalt-rich crusts ; seamonts ; Pacific Ocean
学科分类: Geology
英文摘要: In this paper a comprehensive tracing study is conducted on mantle degassing and deep-seated geological structures in different types of fault zones in the continent of China based on the helium isotope data, coupled with some indices such as CO2/(3) He, CH4/He-3 and Ar-40/Ar-36, and geological tectonics data. There are four representative types of fault zones: (1) Lithospheric fault zones in the extensional tectonic environment are characterized by a small Earth's crust thickness, a lower CH4/He-3-high R and lower CO2/He-3-high R system, the strongest mantle degassing, and the dominance of mantle fluid, as is represented by the Tancheng-Lujiang fault zone. (2) The lithospheric fault zones or the subduction zone in the strongly compresso-tectonic environment, for instance, the Bangonghu-Nujiang fault zone, are characterized by a huge thick Earth's crust, with the R/Ra values within the range of 0.43-1.13, and weak mantle degassing with mantle-source helium accounting for 5%-14% of the total. (3) The deep-seated fault zones at the basinal margins of an orogenic belt are characterized by R values being on order of magnitude of 10(-7), and the CH4/He-3 values, 10(9)-10(10), CO2/He-3 values, 10(6)-10(8); as well as much weak mantle degassing. (4) The crustal fault zones in the orogenic belt, such as the Yaojie fault zone (F-19), possess a high CH4/He-3-Iow R (10(-8)) and high CO2/He-3-low R system, with no obvious sign of mantle degassing. Studies have shown that the deep-seated huge fault zones are the major channel ways for mantle degassing, the main factors controlling the intensity of mantle degassing are fault depth, tectonic environment and crust thickness; the intensity of mantle degassing can reflect the depth and the status of deep-seated tectonic environment of fault, while the geochemical tracing studies of gases can open up a new research approach; upwelling activity of hydrothermal fluids from the deep interior of the Earth may be one. of the driving forces for the formation and evolution of the huge deep fault zones. Piedmont fault zones are the locations where deep-seated tectonic activity and crust/mantle structure are transformed, which are of great significance in understanding the mechanisms of formation of orogenic belts and basins.
收录类别: SCI
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.lig.ac.cn/handle/132962/2154
Appears in Collections:油气地球化学研究室_期刊论文

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Recommended Citation:
Sun XiaoMing; Xue Ting; He GaoWen; Ye XianRen; Zhang Mei; Lu HongFeng; Wang ShengWei.Noble gases isotopic compositions and sources of cobalt-rich crusts from west Pacific Ocean seamounts,ACTA PETROLOGICA SINICA,2006,22(9):2331-2340
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文件名: sun xiaoming,2006西太平洋海底海山富钴结壳惰性气体同位素组成及其来源.pdf
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