白云鄂博超大型Fe-Nb-REE矿床碳酸盐脉状体的包裹体研究

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	白云鄂博超大型Fe-Nb-REE矿床碳酸盐脉状体的包裹体研究
其他题名	Fluid inclusion study of the carbonate vein-like bodies in the Bayan Obo deposit, Inner Mongolia, China
	秦朝建
	2002
学位授予单位	中国科学院地球化学研究所
学位授予地点	中国科学院地球化学研究所
学位名称	博士
学位专业	地球化学
关键词	流体包裹体碳酸盐脉状体碳酸岩赋矿白云岩岩石成因白云鄂博
摘要	白云鄂博矿床是世界上最大的Fe-Nb-REE矿床,其矿床成因一直是中外地质学家争论的焦点.而矿床附近的碳酸盐脉状体则成为赋矿白云岩岩浆成因的直接因素,该文拟从包裹体的角度对矿区碳酸盐脉状体进行研究,对其成因进行探讨,并对其与赋矿白云岩的关系作初步的讨论.通过对碳酸盐脉状体包裹体在包裹体类型,组合,均一温度,盐度,成分等方面的研究,发现不同区域,不同产状的碳酸盐脉状体包裹体特征存在较大的差异,这反映了其在岩石成因方面的差异:(1)都拉哈拉和尖山附近:为典型的岩浆成因;(2)宽沟背斜核部:可能是富碳酸盐盐熔体侵入构造裂隙形成的;(3)白云镇东北部(CV31,CV32)可能为侵入到混合岩中的热液脉;(4)东介勒格勒以南:具有明显的沉积特征.
其他摘要	This thesis mainly focus on the fluid inclusion study of the carbonate vein-like bodies in the Bayan Obo super-large Fe-Nb-REE deposit, Inner Mongolia, China. Based on the studies of petrology, mineralogy of carbonate vein-like bodies, and the microscopic identification, petrography, microthermometry, composition analysis of fluid inclusions of carbonate vein-like bodies, and also the comparative studies of fluid inclusions in the dolomitic host rock (H6～8) of iron ore-bodies and two typical carbonatites (Mountain Pass carbonatite and Lueshe cal-carbonatite), the genesis of the carbonate vein-like bodies and the relationship between the carbonate vein-like bodies and dolomitic host rockhas been discussed. The main conclusions have been summarized as follow: The number of carbonate vein-like bodies in the the Bayan Obo deposit is more than 30. The Carbonate vein-like bodies in different distribution regions and geological accurrences possess defferent petrologic genesis: 1). The carbonate vein-like bodies near Dulahala and Jianshan (CD 13, CD 19 and BN13 et al.) are of the origin of alkali carbonatite magma. They underwent the formation stages: the alkali carbonatite magma crystallization of carbonatite, metasomatism carbonatite rock and the wall rock alteration. Immiscibility of carbonatite magma, CO2-rich low salinity fluid and high salinity fluid occurs in carbonatite crystallization stage based on the symbiotic inclusions of various types. 2) The carbonate vein-like bodies situated at Kuangou anticline (CDl～10, CD17 and CD18 et al.) are proposed the cause of formation of emplacement, inflation and crystallization of high salinity carbonatic-rich hydrothermal from metamorphic or alteration fluid of dolomitic host rock metamorphic and alteration fluid through deep fault and fractures. 3) The carbonate vein-like bodies nearby mainroad about 2 km northeast far from Bayan Obo town (CV31 and CV32) were formed by typical carbonate-rich hydrothermal fluid. 4) The carbonate vein-like bodies in the same direction as wall stratum rock of H5 carbonatic slate located at the south of Dongjielegele ore bodies and the lenticular carbonate vein-like bodies located in the north of Main Ore Body in H5 between dolomitic host rock (H6～8) and quartzite (H4) are the marine facies sediment interbedded layers in H5 stratum, and underwent various degree metamorphism, alteration and recrystallization. 3. It is conceivable that the protolith of carbonatic host rock of the Bayan Obo Fe-Nb-REE deposit is marine facies carbonate sediment, and suffered from multi-stage metamorphism and hydrothermal alteration and metasomatism, some fluids were of deep fluid and had potential mantle-derived fluid properties. The ore bodies (mainly Main Ore Body and East Ore Body) have suffered the strongest fluid alteration, and the fluid are with deep crust or mantle-derived properties.
页数	131
语种	中文
文献类型	学位论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/3608
专题	研究生_研究生_学位论文
推荐引用方式 GB/T 7714	秦朝建. 白云鄂博超大型Fe-Nb-REE矿床碳酸盐脉状体的包裹体研究[D]. 中国科学院地球化学研究所. 中国科学院地球化学研究所,2002.

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