荷叶塘陨石岩矿特征及化学-岩石类型研究  

CHEMICAL AND PETROLOGIC STUDY OF THE HEYETANG METEORITE

作　　者：沈文杰 胡森[3] 林杨挺[3] 缪秉魁[4] 

机构地区：[1]中山大学地球科学系,广东广州510275 [2]广东省地质过程与矿产资源探查重点实验室,广东广州510275 [3]中国科学院地球深部研究重点实验室中国科学院地质与地球物理研究所,北京100029 [4]桂林理工大学地球科学学院,广西桂林541004

出　　处：《极地研究》2013年第4期386-393,共8页Chinese Journal of Polar Research

基　　金：中国科学院知识创新项目(KZCX2-YW-Q08);国家自然科学基金项目(40803014);高校基本科研业务费(32110-3161324)资助

摘　　要：荷叶塘陨石是1998年10月降落的一块普通球粒陨石。在对荷叶塘陨石的岩石学和矿物化学特征分析的基础上,厘定了荷叶塘陨石的岩石类型和次级岩石类型。荷叶塘陨石橄榄石的Fa值在0.6—48.8,平均值为23.2,PMD为60.1%;低钙辉石的Fs值在0.6—49.0,平均值为9.1,PMD为97.5%。结合橄榄石Fa值的PMD与陨石次级岩石类型的关系、橄榄石中的Cr含量、铁纹石中富Ni颗粒的数量密度等,综合判断荷叶塘陨石的化学-岩石类型为L3.3,由此表明该荷叶塘陨石是一块热变质程度非常低的L型非平衡普通球粒陨石。The Heyetang meteorite is an ordinary chondrite that fell in October 1998.The petrologic subtype of the Heyetang meteorite was determined on the basis of detailed petrologic and mineralogical characteristics .The mean value of Fa in the olivine is 23.2, with a range from 0.6 to 48.8 （percent mean deviation （PMD）=60.1%）.The mean value of Fs in low-Ca pyroxene is 9.1 with a range from 0.6 to 49.0（PMD=97.5%）.Thus, it is an un-equilibrated type 3 ordinary chondrite .The chemical group was indicated by Fa value , the total Fe-Ni metal and troilite contents , the Co and Ni contents in kamacite and it actually has L group features .According to the PMD of Fa content in olivine , the Cr2 O3 content in olivine and Ni-rich metals in chondrules , the petrologic subtype of the Heyetang meteorite belongs to L3.3.Therefore, Heyetang meteorite is one of the most primitive ordinary chondrites in all of the non-Antarctic meteorites in China .

关 键 词：荷叶塘 普通球粒陨石 非平衡型陨石 L3 3 

分 类 号：P185.83[天文地球—天文学]