RAMAN SPECTROSCOPY OF C,H,L AND LL CHONDRITES AND ITS SIGNIFICANCE IN EXPLORING THE FORMATION ENVIRONMENTS OF METEORITES AND THEIR TAXONOMY  

作　　者：李肇辉 欧阳自远 王道德 翁昭莹 

机构地区：[1]Institute of Geochemistry, Academia Sinica, Guangzhou 510640, PRC [2]Instrumentation Analysis & Research Centre, Zhongshan University, Guangzhou 510275, PRC

出　　处：《Science China Chemistry》1991年第6期741-750,共10页中国科学（化学英文版）

基　　金：Project supported by the National Natural Science Foundation of China.

摘　　要：The comparison of Raman spectra of the chondrites (C, H, L, LL) has confirmed thatthere exist two types of meteorite carbon: one is the primary carbon present in carbonaceouschondrites (c) and the other is the secondary carbon contained in ordinary chondrites (H, L,LL). The parameter of order (I_G/I_D intensity ratio, similarly hereinafter) of primary car-bon tends to decrease with increasing petrologic type and it can reflect the temperature ofdust carrier at the time plasma gases in the early nebula were condensed to form primarycarbonaceous material and the hydrogen content in primary carbonaceous material. This kindof primary carbonaceous material maybe has not experienced late stage thermometamorphismwithin the parent body of chondrites, indicating that the carbonaceous chondrites wereformed and retained in the low temperature region of the solar system. The parameter oforder of the secondary carbon tends to increase with increasing petrologic type and it can re-flect the degree of graphitization of secondary carbonaceous material within the parent bodyof chondrites and the temperature of thermometamorphism in the chondrites. Carbonaceouschondrites originate from comets and Alfven's bypothesis from plasma to planet was sup-ported by the results of Raman spectroscopic research of chondrites.The comparison of Raman spectra of the chondrites (C, H, L, LL) has confirmed thatthere exist two types of meteorite carbon: one is the primary carbon present in carbonaceouschondrites (c) and the other is the secondary carbon contained in ordinary chondrites (H, L,LL). The parameter of order (I_G/I_D intensity ratio, similarly hereinafter) of primary car-bon tends to decrease with increasing petrologic type and it can reflect the temperature ofdust carrier at the time plasma gases in the early nebula were condensed to form primarycarbonaceous material and the hydrogen content in primary carbonaceous material. This kindof primary carbonaceous material maybe has not experienced late stage thermometamorphismwithin the parent body of chondrites, indicating that the carbonaceous chondrites wereformed and retained in the low temperature region of the solar system. The parameter oforder of the secondary carbon tends to increase with increasing petrologic type and it can re-flect the degree of graphitization

关 键 词：CHONDRITE Raman spectroscopy primary CARBON secondary CARBON origin of METEORITE 

分 类 号：O6[理学—化学]