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地质科学  1998, Vol. Issue (1): 51-60    DOI:
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华北地台深部地幔流体的组成——来自金刚石不纯净组分的报道
郑建平, 路凤香
中国地质大学, 武汉 430074
THE CONSTITUENTS OF DEEP MANTLE FLUIDS BENEATH NORTH-CHINA PLATFORM——Information from the Impurities in Diamond
Zheng Jianping, Lu Fengxiang
China University of Geosciences, Wuhan 430074
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摘要 从金刚石成因研究,流体包裹体、表征流体存在的固态包裹体及晶格原子、流体成分组合的制约因素等方面,论述了深部地幔流体的存在。华北地台原生金刚石中与流体包裹体共存的钛铁矿+铬铁矿、金红石+金云母+橄榄石、锆石+碳酸盐+橄榄石、磷灰石+金云母+橄榄石组合。相平衡原理揭示地幔流体存在着复杂的自催化反应。华北地台由金刚石流体包裹体所反映的深部地幔组成C、H、O、S和N分别为16.87%、47.47%、30.90%、3.02%和5.38%(皆为原子百分比),与现代大气圈、水圈相比明显富H贫O。
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郑建平
路凤香
关键词地幔流体   华北地台   金刚石   不纯净组分     
Abstract: With the advance of the study of upper mantle and the development of analyzing techniques,the study on diamonds becomes more and more important.In addition,because of the special conditions of the formation of diamond,its mechanical strength and chemical inertness,and the relationship between formation of diamond and mantle fluid (directly or indirectly),diamond is probably the best material for preserving such fluids to the surface,the impure components in diamond can provide abundant information on mantle fluid.Though the fluid constituents in diamonds are of local difference,they are still of global distribution.The existence of deep mantle fluid is confirmed by the genesis of diamond,the fluid inclusion,the solid inclusion and atom in lattice indicating mantle fluid,and the restrictive factors of fluid assemblage.The mineral assemblages co existing with fluid inclusions in diamond include ilment+cholmite,rutile+phlogopite+olivine,zircon+carbonitite+olivine,apatite+phlogopite+olivine.Complex self-catalytic reaction in mantle fluid is revealed by phase equilibrium.The constituents of deep mantle fluid revealed by fluid inclusions in diamonds are 16.87%,47.47%,30.90%,3.02% and 5.38% of C,H,O,S,N,respectively,which is richer in H and poorer in O compared with atmosphere and hydrosphere.The deep mantle fluids are one of the sources of fluids participating in the shallow geological processes,and are of close relationship with earth evolution.
Key wordsMantle fluid   North-China platform   Diamond   Impurities constituents   
收稿日期: 1996-03-25;
基金资助:国家自然科学基金
引用本文:   
郑建平,路凤香. 1998, 华北地台深部地幔流体的组成——来自金刚石不纯净组分的报道. 地质科学, (1): 51-60.
Zheng Jianping,Lu Fengxiang. THE CONSTITUENTS OF DEEP MANTLE FLUIDS BENEATH NORTH-CHINA PLATFORM——Information from the Impurities in Diamond[J]. Chinese Journal of Geology, 1998, (1): 51-60.
 
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