陨石的矿物-岩石学特征及其分类

根据陨石的矿物岩石学特征、化学组成及结构可划分为球粒陨石及非球粒陨石质陨石两大类。球粒陨石进一步划分为碳质球粒陨石族(CI,CM,CO,CR,CB,CH,CV及CK球粒陨石)、普通球粒陨石族(H,L,LL球粒陨石)、顽辉石球粒陨石族(EH及EL球粒陨石)、R及K球粒陨石群,而非球粒陨石质陨石进一步划分为原始的无球粒陨石族(Acpulcoites,Lodranites,Wi nonaites,IAB硅酸盐包体及IIICD硅酸盐包体)和分异的陨石族。分异的陨石族包括:无球粒陨石(Angrites,Aubrites,Branchinites,橄辉无球粒陨石,HED灶神星陨石,SNCO火星陨石及月球陨石);石铁陨石(中铁陨石及橄榄陨铁);铁陨石(IAB,IC,IIAB,IIC,IID,IIE,IIIAB,IIICD,IIIE,II IF,IVA及IVB铁陨石化学群)。每一陨石族或陨石群,具有类似的成因或形成历史,并来自同一小行星体或行星体,藉此可建立不同陨石族或陨石群之间的成因联系,并可提供早期太阳星云的物理化学条件及其演化的信息。

MINERALOGIC-PETROLOGIC CHARACTERISTIC OF METEORITES AND THEIR CLASSIFICATION

On the basis of minerologic-petrologic characteristics, chemical compositions,oxygen isotopes and textures meteorites are classified into two major categories : chondrites and nonchondritic meteorites.Chondrite can be further divided into carbonaceous chondrite clan (CI,CM,CO,CR,CB,CH,CV and CK chondrites),ordinary chondrite clan(H,L,LL chondrites), enstatite chondrite clan(EH and ELchondrites),R and K chondrite group, and that nonchondritic meteorites are further classified into primitive achondrites and the igneously differentiated meteorites.Primitive achondrites are including Acpulcoites,Lodranites,Winonaites,IAB silicate inclusions and IIICD silicate inclusions. The igneously differentiated meteorites are classified into achondrites (Angrites,Aubrites ,Branchinites,Ureilites,HEDVista meteorites,SNCO martian meteorites and lunar meteorites),stony irons(mesosiderirtes and pallasites) and iron meteorites(IAB,IC,IIAB,IIC,IID,IIE,IIIAB,IIICD,IIIE,IIIF,IVA and IVB iron meteorite groups).Every meteorite clan or meteorite group have similar origins or formation histories that could be derived same asteroidal or planetary parent body,thereby we can establish possible genetic relationships between various meteorire clans or meteorite groups .These different meteorite clans or meteorite groups may provide informations of physical-chemical conditions and their evolution history of early solar nebula.