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首页 > 中国极地考察知识库 > 成果信息库 > 已审查 荷叶塘陨石岩矿特征及化学-岩石类型研究

荷叶塘陨石岩矿特征及化学-岩石类型研究

【标题】荷叶塘陨石岩矿特征及化学-岩石类型研究

【Title】CHEMICAL AND PETROLOGIC STUDY OF THE HEYETANG METEORITE

【DOI】10.3724/SP.J.1084.2013.00386

【作者】 沈文杰; 胡森; 林杨挺; 缪秉魁

【Author】 Shen Wenjie ; Hu Sen ; Lin Yangting ; Miao Bingkui

【期刊】极地研究

【Journal】ADVANCES IN POLAR SCIENCE

【期刊年份】2013

【卷】25

【期】4

【关键词】 荷叶塘; 普通球粒陨石; 非平衡型陨石; L3.3型

【Keywords】 Heyetang; Ordinary meteorite; Unequilibrated meteorite; Type L3.3

【摘要】荷叶塘陨石是1998年降落的一块普通球粒陨石。本文在对荷叶塘陨石的岩石学和矿物化学特征分析的基础上,划分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之间,平均值为23.2,PMD为60.1%;低钙辉石的FS值在0.6-49.0之间,平均值为9.1,PMD为97.5%。结合橄榄石Fa值的PMD与次级岩石类型关系、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。

【Abstract】Heyetang meteorite is an ordinary chondrite falling in 1998.. Petrologic subtype of Heyetang meteorite was determined on the basis of detailed petrologic and mineralogical characteristics. The mean value of Fa in olivine is 23.2 with the 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 the range from 0.6 to 49.0(PMD = 97.5%). Thus, it is an unequilibrated 3 type ordinary chondrite(OC). The chemical group was indicated by Fa value, total content of Fe-Ni metal and troilite, Co and Ni contents in kamacite and it actually has L group features. According to PMD of Fa content in olivine, Cr2O3 content in olivine and Ni-rich metals in chondrules, petrologic subtype of Heyetang meteorite belongs to L3.3 type OC. And it is one of the most primitive chondrite in the non-Antarctic meteorites in China.

【基金/项目】 华南二叠-三叠纪界线高分辨率野火事件研究 ; 中国科学院知识创新计划(KZCX2-YW-Q08)

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