Noble Gas Isotopic Compositions in Mantle Fluids and Mantle-Derived Natural Gas Pool

Abstract

Abstract: Noble gas isotopic compositions in mantle fluids are associated with their tectonic settings and magmation in deep mantle. For'He/*He ratio, the mid-oceanic basalts range 8~ 10R; hot-spot mantle source is over 30R,; back-arc basinal basalts and mantle xenolithsvary widely frome 5Ra to 22R,; terrestrial mantle xenoliths are 3~ 10R; He component in diamonds is not only primitively captured, but al-so invaded from the outside. In rift basins of East China occurs mantle source gas pool with 3He/'He ratio of 2.7~6.4R,, and such mantlegases migration and accumulation are related to the regional deep faulting. In general, 40Ar/·*Ar value in mantle source is around 350,and increases with the feeding of continental crust materials. In mantle contains solar Ne, and samples reveal the same ratio of Ne and Xeisotopic compositions with atmospheric Ne/Xe ratio. Also, it is found out that Ne and Xe isotopic compositions appear excess phe-nomenon compared to the atmospheric ones. Study shows that they are characterized by nuclear origins.

Key words: mantle fluid , noble gas , isotopic composition , natural gas

CLC Number:

TE111.111

WU Mao-bing^*, LIU Chun-yan², ZHOU Hui-wu². Noble Gas Isotopic Compositions in Mantle Fluids and Mantle-Derived Natural Gas Pool[J]. Xinjiang Petroleum Geology, 2004, 25(3): 240-243.

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