南极格罗夫山陨石的岩石-矿物学特征及初步分类

我国第16次南极科考队在格罗夫山的蓝色冰表面回收到28块陨石,本文通过详细的显微镜观测和矿物成分的电子探针定量分析,确定28块陨石中的26块为普通球粒陨石,2块为无球粒陨石。在26块球粒陨石中高铁群(H)有11块,低铁群(L)有10块,低铁低金属群(LL)5块。其中H3 5块、H4 2块、H51块和H6 3块;L3 1块、L4 2块、L5 2块、L6 5块。LL4 1块、LL53块、LL6 1块。两块无球粒陨石GRV 99027和GRV 99018具有较高的研究价值,初步确定GRV 99027为二辉橄榄质火星陨石,GRV 99018为钙长辉长无球粒陨石。

METEORITE CHARACTERISTICS OF PETROLOGY- MINERALOGY AND CLASSIFICATION IN GROVE MOUNTAINS, ANTARCTICA

Observations under microscope and electron probe analysis results of 28 new meteorites collected from the Grove Mountains ice field, Antarctica, by the 16th Chinese Antarctic Research Expedition, show that two meteorites belong to shergottites, and the other 26 meteorites are classified as ordinary chondrites, including 11 meteorites bearing high iron content ( H group) , 10 with low iron content (L group) and 5 with low iron and other metal phase contents ( LL group) . In H group, there are 5 primitive type 3 meteorites and 6 evolutional meteorites in which the later is further classified into 2 type 4 meteorites, one type 5 meteorite and 3 type 6 meteorites. For the L group, one type 3 meteorite, 2 type 4 meteorites, 2 type 5 meteorites and 5 type 6 meteorites are sub- classified, and 5 meteorites of LL group is also further classified into one type 4 meteorite, 3 type 5 meteorites and one type 6 meteorite. The two shergottites-GRV 99027 and GRV 99018 show they belong to new type meteorites with significance for researches, and are primary ascertained that GRV 99027 may belong to martian Iherzolite, and GRV 99027 may belong to eucrite.