新疆庫木塔格004號隕石球粒類型研究及其在球粒分類體系的應(yīng)用
發(fā)布時間：2018-11-21 12:09
【摘要】：球粒是球粒隕石的主要組分,目前球粒分類體系主要有3種,即結(jié)構(gòu)分類、FeO-SiO2分類和M-FeO-CaO分類。球粒結(jié)構(gòu)分類過于依賴結(jié)構(gòu)與形態(tài),而與化學成分聯(lián)系不緊密。FeO-SiO2分類體系和M-FeO-CaO分類體系在傳統(tǒng)的結(jié)構(gòu)分類體系基礎(chǔ)上加入了礦物化學分類參數(shù),這有利于進一步研究太陽星云演化的物理化學過程。但與結(jié)構(gòu)分類相比,很少利用FeO-SiO2和M-FeO-CaO分類體系對隕石球粒進行分類。本次所研究隕石為中國新發(fā)現(xiàn)的沙漠隕石富集區(qū)——新疆庫木塔格沙漠004號隕石(L4,S4,W3),在對其中的球粒進行了詳細普查和研究的基礎(chǔ)上,分別利用3種分類體系對該隕石中的球粒進行分類,并進一步探討了FeO-SiO2分類和M-FeO-CaO分類方法優(yōu)缺點與應(yīng)用范圍。通過對比分析,提出了后兩種分類方法的改進意見:針對FeO-SiO2分類體系,提出以硅酸鹽中FeO=7.5%(wt%)為I型和Ⅱ型球粒分界線,SiO2=47%及53%(wt%)為A型、AB型和B型球粒分界線。FeO-SiO2分類體系不僅能應(yīng)用于斑狀球粒,也適用非斑狀球粒。對M-FeO-CaO分類體系依據(jù)輝石組分(FeO及CaO,單位wt%)對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)球粒的類型區(qū)間進行了初步劃分。
[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，
本文編號：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，
本文編號：2346928
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