Eight carbonatite samples were analysed for delta(17)Cl and for delta(18)O and delta(13)C. Th, results show that unaltered carbonatites have delta(37)Cl ratios between -0.8 and +0.1 parts per thousand. Because the whole mantle delta(37)Cl value is approximately +4.7 parts per thousand, chlorine for carbonatite is anomalously light. Although it is possible that the source regions for carbonatites represent isotopic anomalous mantle and may reflect contamination by a crustal component, our preferred explanation is that the processes resulting in the accumulation of carbonatite magma cause fractionation of chlorine isotopes.
机构:
Univ Washington, Dept Earth & Space Sci, Isotope Lab, Seattle, WA 98195 USA
Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, POB 9825, Beijing 100029, Peoples R ChinaUniv Washington, Dept Earth & Space Sci, Isotope Lab, Seattle, WA 98195 USA
Hu, Yan
Teng, Fang-Zhen
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Univ Washington, Dept Earth & Space Sci, Isotope Lab, Seattle, WA 98195 USAUniv Washington, Dept Earth & Space Sci, Isotope Lab, Seattle, WA 98195 USA
Teng, Fang-Zhen
Zhang, Hong-Fu
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Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, POB 9825, Beijing 100029, Peoples R ChinaUniv Washington, Dept Earth & Space Sci, Isotope Lab, Seattle, WA 98195 USA
Zhang, Hong-Fu
Xiao, Yan
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Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, POB 9825, Beijing 100029, Peoples R ChinaUniv Washington, Dept Earth & Space Sci, Isotope Lab, Seattle, WA 98195 USA
Xiao, Yan
Su, Ben-Xun
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Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, POB 9825, Beijing 100029, Peoples R ChinaUniv Washington, Dept Earth & Space Sci, Isotope Lab, Seattle, WA 98195 USA
机构:
Tongji Univ, State Key Lab Marine Geol, Shanghai, Peoples R China
Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Beijing, Peoples R ChinaTongji Univ, State Key Lab Marine Geol, Shanghai, Peoples R China
Qian, Shengping
Zhou, Huaiyang
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Tongji Univ, State Key Lab Marine Geol, Shanghai, Peoples R ChinaTongji Univ, State Key Lab Marine Geol, Shanghai, Peoples R China
Zhou, Huaiyang
Zhang, Le
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Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Beijing, Peoples R ChinaTongji Univ, State Key Lab Marine Geol, Shanghai, Peoples R China
Zhang, Le
Cheng, Rong
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Tongji Univ, State Key Lab Marine Geol, Shanghai, Peoples R ChinaTongji Univ, State Key Lab Marine Geol, Shanghai, Peoples R China