Ca, Al-rich inclusions in Yamato 791717 (CO3) carbonaceous chondrite: Formation and alteration  

作　　者：林扬挺 王道德 KIMURAMakoto 

出　　处：《Science China Earth Sciences》1998年第5期513-521,共9页中国科学（地球科学英文版）

基　　金：ProjectsupportedbytheNationalNaturalScienceFoundationofChina (GrantNo .4 96 732 0 0 ) ;andbytheJapaneseSocietyforPromotionofSciences (JSPS) .

摘　　要：In three polished thin sections of Yamato 791717 (CO3), fifty\|five Ca, Al\|rich inclusions were found, which include two hibonite\|bearing, eight melilite\|rich and forty\|five spinel\|pyroxene inclusions. Based on the petrography and mineral chemistry of the inclusions, it is proposed that the melilite\|rich inclusions and spinel\|pyroxene inclusions condensed in the solar nebula, and the hibonite\|bearing inclusions crystallized from melts. The heavy alteration of the inclusions in Yamato 791717, which probably took place under a very oxidizing condition in the solar nebular, is also confirmed.In three polished thin sections of Yamato 791717 (CO3). fifty-five Ca, Al-rich inclusions were found, which include two hibonite-bearing, eight melilite-rich and forty-five spinel-pyroxene inclusions. Based on the petrography and mineral chemistry of the inclusions, it is proposed that the melilite-rich inclusions and spinel-pyroxene inclusions condensed in the solar nebula, and the hibonite-bearing inclusions crystallized from melts. The heavy alteration of the inclusions in Yamato 791717, which probably took place under a very oxidizing condition in the solar nebular, is also confirmed.

关 键 词：METEORITE CHONDRITE inclusion solar NEBULA condensation crystallization alteration. 

分 类 号：P185.83[天文地球—天文学]