天然矿物Wadsleyite在我国首次发现  

THE FIRST DISCOVERY OF WADSLEYITE IN CHINA

作　　者：王奎仁[1] 洪吉安[1] HenryO.A.Meyer 

机构地区：[1]中国科学技术大学地球与空间科学系 [2]Dept.EarthandAtmosphericSciences,PurdueUniversityWestLafayetteIN47907,USA

出　　处：《矿物学报》1995年第1期9-14,共6页Acta Mineralogica Sinica

摘　　要：对于在毫县陨石中发现的X矿物，本文用电子探针获得了其化学成分：（Mg1.6271Fe0.3729）2SiO4，用X射线微区衍射得到了其结构参数。该矿物属斜方晶系，晶胞参数α＝0．8264，b＝1．1448，c＝0.5704nm。这些结果证明了它是Wadsleyite，是橄榄石的高压相──β（Mg，Fe）2SiO4由冲击变质作用形成的。该矿物呈包裹体产出，在我国属首次发现。The composition of mineral X, found in the Boxian chondrite, was obtained by EPMA. Its simplified chemical formula is (Mg1.6271Fe0.3729)2SiO4. The structure of the mineral was determined by X-ray microprobe diffractometer. X-ray study shows that the mineral is orthorhombic, with the unit cell parameters a = 0. 8264nm, b=1. 1448nm and c = 0. 5704nm, respectively- The results show that the mineral is wadsleyite- a high-pressure phase of olivine [β-(Mg,Fe)2SiO4],which resulted from shock metamorphism. The mineral occurred as inclusions. It has been discovered for the firbt time in China.

关 键 词：WADSLEYITE 包裹体 电子探针 天然矿物 橄榄石 

分 类 号：P578.942[天文地球—矿物学]