Carbon isotopic composition of mantle xenoliths in alkali basalt from Damaping, Hebei |
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Authors: | Gang Liu Xianbin Wang Qibin Wen |
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Affiliation: | LIU Gang 1,2, WANG Xianbin+1, WEN Qibin+1 1. State Key Laboratory of Gas Geochemistry, Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou 730000, China; 2. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemisty, Chinese Academy of Sciences, Guangzhou 510640, China |
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Abstract: | The carbon isotopic composition of CO-2, CO and CH-4 extracted by pyrolysis from spinel lherzolite and black pyroxenolite xenoliths in alkali basalt from Damaping has been measured with GC_MS. The results show that, at heating temperatures from 400 to 1 140℃, the δ 13C of CO-2 and CO is -22‰--27‰, and that of CH-4 -30‰--50‰. The data imply that the magma which was generated in the upper mantle by partial melting in the area has experienced the multistage degassing process, and the δ 13C values represent the carbon isotopic composition of CO-2, CO and CH-4 remaining in it, respectively. |
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Keywords: | mantle xenolith fluid carbon isotope. |
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