新疆库木塔格004号陨石球粒类型研究及其在球粒分类体系的应用
发布时间：2018-11-21 12:09
【摘要】：球粒是球粒陨石的主要组分,目前球粒分类体系主要有3种,即结构分类、FeO-SiO2分类和M-FeO-CaO分类。球粒结构分类过于依赖结构与形态,而与化学成分联系不紧密。FeO-SiO2分类体系和M-FeO-CaO分类体系在传统的结构分类体系基础上加入了矿物化学分类参数,这有利于进一步研究太阳星云演化的物理化学过程。但与结构分类相比,很少利用FeO-SiO2和M-FeO-CaO分类体系对陨石球粒进行分类。本次所研究陨石为中国新发现的沙漠陨石富集区——新疆库木塔格沙漠004号陨石(L4,S4,W3),在对其中的球粒进行了详细普查和研究的基础上,分别利用3种分类体系对该陨石中的球粒进行分类,并进一步探讨了FeO-SiO2分类和M-FeO-CaO分类方法优缺点与应用范围。通过对比分析,提出了后两种分类方法的改进意见:针对FeO-SiO2分类体系,提出以硅酸盐中FeO=7.5%(wt%)为I型和Ⅱ型球粒分界线,SiO2=47%及53%(wt%)为A型、AB型和B型球粒分界线。FeO-SiO2分类体系不仅能应用于斑状球粒,也适用非斑状球粒。对M-FeO-CaO分类体系依据辉石组分(FeO及CaO,单位wt%)对A1型(FeO1,CaO1)、A2型(FeO≈1—3,CaO0.5)、A5型(FeO≈11—14,CaO≈0.3—0.9)和B型(FeO3,CaO0.5)球粒的类型区间进行了初步划分。
[Abstract]:Chondrites are the main components of chondrites. At present, there are mainly three chondrites classification systems: structural classification, FeO-SiO2 classification and M-FeO-CaO classification. The classification of spherulite structure is too dependent on structure and morphology, but is not closely related to chemical composition. The FeO-SiO2 and M-FeO-CaO classification systems add mineral chemical classification parameters to the traditional structural classification system. This is conducive to further study of the physical and chemical processes of the evolution of the solar nebula. However, compared with structural classification, FeO-SiO2 and M-FeO-CaO classification systems are rarely used to classify chondrites. The meteorite studied in this paper is a newly discovered desert meteorite rich area in China, Xinjiang Kumutag Desert 004 meteorite (L4C4S4W3). On the basis of a detailed survey and study of the chondrites, The chondrites in the meteorite were classified by three classification systems, and the advantages and disadvantages of FeO-SiO2 and M-FeO-CaO classification methods and their applications were also discussed. Through comparison and analysis, the improvement of the latter two classification methods is put forward. According to the FeO-SiO2 classification system, FeO=7.5% (wt%) in silicate is proposed as the dividing line between type I and type 鈪，
本文编号：2346928
[Abstract]:Chondrites are the main components of chondrites. At present, there are mainly three chondrites classification systems: structural classification, FeO-SiO2 classification and M-FeO-CaO classification. The classification of spherulite structure is too dependent on structure and morphology, but is not closely related to chemical composition. The FeO-SiO2 and M-FeO-CaO classification systems add mineral chemical classification parameters to the traditional structural classification system. This is conducive to further study of the physical and chemical processes of the evolution of the solar nebula. However, compared with structural classification, FeO-SiO2 and M-FeO-CaO classification systems are rarely used to classify chondrites. The meteorite studied in this paper is a newly discovered desert meteorite rich area in China, Xinjiang Kumutag Desert 004 meteorite (L4C4S4W3). On the basis of a detailed survey and study of the chondrites, The chondrites in the meteorite were classified by three classification systems, and the advantages and disadvantages of FeO-SiO2 and M-FeO-CaO classification methods and their applications were also discussed. Through comparison and analysis, the improvement of the latter two classification methods is put forward. According to the FeO-SiO2 classification system, FeO=7.5% (wt%) in silicate is proposed as the dividing line between type I and type 鈪，
本文编号：2346928
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