中国原生金刚石的碳同位素组成及其来源

张宏福; 路凤香; 赵磊; M.A.Menzies; D.P.Mattey; 梁尚莹

中国原生金刚石的碳同位素组成及其来源

1.
中国科学院地质与地球物理研究所, 岩石圈演化国家重点实验室, 北京 100029
2.
Department of Geology, Royal Holloway University of London, Egham, Su rrey T W20 OEX, UK
3.
中国地质大学岩石矿物地球化学系, 北京 100083
4.
Department of Geology and Geography, Lehman College, City University of New York 10468, USA

基金项目:

国家自然科学基金重点项目 90714008

国家自然科学基金重点项目 40523003

国家自然科学基金重点项目 40721062

国家教委留学回国人员科研启动基金 49733110

详细信息

作者简介:
张宏福(1962-), 男, 研究员, 主要从事地幔地球化学和岩石圈演化研究.E-mail: hfzhang@mail.igcas.ac.cn

中图分类号: P597
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出版历程
- 收稿日期: 2008-10-11
- 刊出日期: 2009-01-25

Carbon Isotopes in China Natural Diamonds

1.
S tate K ey Labor atory o f Lithosp her ic E vo lution, Institute o f Geolog y an d Geoph ysics, Chinese Academy o f S ciences, Beijin g 100029, China
2.
Department of Geology, Royal Holloway University of London, Egham, Su rrey T W20 OEX, UK
3.
Depar tmen t o f Petr olog y an d Miner alog y, Ch ina University o f Geosciences, Beij ing 100083, Ch ina
4.
Department of Geology and Geography, Lehman College, City University of New York 10468, USA

摘要

摘要: 中国两大主要的原生金刚石产地--山东蒙阴和辽宁复县产出有大量的高质量金刚石.通过对这些纯净金刚石碳同位素组成的激光消熔质谱分析, 发现这些地区单颗粒金刚石普遍存在碳同位素组成环带, 而且含固态矿物包裹体的金刚石比不含包裹体的金刚石的环带结构更为明显; 同时揭示了形成这些金刚石的碳来源于地幔深部, 即幔源碳, 而无来自地表的由重循环作用形成的壳源碳.
- 中国 /
- 原生金刚石 /
- 碳同位素 /
- 激光消熔质谱
Abstract: China' s two major natural diamond-producing mines-Shandong Mengyin and Liaoning Fuxian produce a large quantity of high-quality diamonds. EA-IRMS (Isotope Ratio Mass Spectrometry connected with Elemental Analyzer) analyses reveal that these single-crystal diamonds ubiquitously bear carbon isotope zonation. And in both localities, the carbon isotope zonation is more apparent in solid inclusion-bearing diamonds than in non-inclusion diamonds. Carbon isotope nature in Chinese diamonds also demonstrates that these diamonds-forming carbons were derived from mantle, with no equivocal evidence for the involvement of crust carbons derived from the recycling of the surface sediments.
- China /
- natural diamond /
- Carbon isotope /
- EA-IRMS

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图 1 山东蒙阴和辽宁复县金伯利岩中原生金刚石的碳同位素组成(‰)

Fig. 1. Carbon isotopes (‰) in natural diamonds from Mengyin and Fuxian kimberlites

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图 2 中国华北原生金刚石及其寄主岩金伯利岩(据朱源和毛志海, 1991) 的碳同位素变化

同时与全球橄榄岩型和榴辉岩型金刚石和石墨(Deines, 1980;Swart et al., 1983;Dein es et al., 1984, 1987, 1991, 1993, 1997;Javoy et al ., 1984;Boyd et al ., 1987, 1992;Galimov, 1991;Pearson et al., 1994; Sch ulze et al., 1997) 、大洋玄武岩(OIB +M ORB) 中的石墨(Exley et a l., 1986;Pearson et al ., 1994) 、火成碳酸岩以及古代和现代海洋沉积物的碳同位素(Faure, 1977;San tos and C lay ton, 1995) 组成范围进行对比

Fig. 2. The range in carbon isotopes in Chinese natural diamonds and the host kimberlites from the North China

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表 1 中国原生金刚石的δ¹³C值(%o)

Table 1. δ¹³C values (%) in Chinese natural diamonds

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