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Petrographic shock indicators and noble gas signatures in a H and an L chondrite from Antarctica

文献类型：期刊论文

作者Ranjith, P. M.1,2; He, Huaiyu1,2; Miao, Bingkui3; Su, Fei1; Zhang, Chuantong3,4; Xia, Zhipeng3; Xie, Lanfang3; Zhu, Rixiang1
刊名PLANETARY AND SPACE SCIENCE
出版日期2017-10-15
卷号146页码:20-29
关键词Shock metamorphism Ordinary chondrites Noble gas Cosmic ray exposure age Gas retention age
ISSN号0032-0633
DOI10.1016/j.pss.2017.08.009
文献子类Article
英文摘要Petrographic shock indicators and noble gas signatures are studied in two ordinary chondrites, Grove Mountain (GRV) 13083 (H4) and GRV 13095 (L5), from Antarctica to investigate the degree of shock metamorphism and impact related chronologies on H and L chondrite parent bodies. In the study, we have combined both noble gas signatures and petrographic observations to understand impact effects. Based on the impact features in silicates and metal-troilite assemblages, the shock stages of the samples are classified as S6 and S5 for GRV 13095 (L5) and GRV 13083 (H4) respectively. The nominal K-Ar gas retention age of GRV 13095 (L5, S6) using bulk sample is estimated as 459 +/- 13 Ma, supporting the recent major catastrophic break up event at 470 Ma on the L-chondrite parent body. The cosmic ray exposure age based on He, Ne and Ar noble gas measurements is estimated as 14.1 +/- 2.5 Ma. The radiogenic gas contents in GRV 13095 (avg. He-4 = 61.5 x 10(-8) ccSTP/g and avg. Ar-40 = 173.5 x 10(-8) ccSTP/g) are observed as depleted. The depletion in radiogenic gases is consistent with the severe shock metamorphism in GRV 13095 as indicated by olivine-ringwoodite transformation in it. The estimated nominal K-Ar age of 3.67 +/- 0.26 Ga for GRV 13083 shows that it falls in the major impact age distribution between 3.5 and 4.0 Ga among H-chondrites. The cosmic ray exposure age of GRV 13083 is 3.9 +/- 0.7 Ma, which is younger than the major peak in the exposure age distribution for H-chondrites. The He gas retention ages in both samples are found to be younger/lower than their respective nominal K-Ar ages, which could be due to partial loss of radiogenic He. Trapped gas loss along with radiogenic gas losses in both samples, are the adverse effects of shock metamorphism.
WOS关键词EXPOSURE HISTORY ; PARENT BODIES ; METEORITES ; CLASSIFICATION ; AGE ; TROILITE ; METAL ; RINGWOODITE ; ORDOVICIAN ; ASSEMBLAGE
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000412788600003
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构Chinese Academy of sciences (CAS) ; The World Academy of sciences (TWAS) ; National Natural Science Foundation of China(41425013 ; 41490631) ; Chinese Academy of sciences (CAS) ; The World Academy of sciences (TWAS) ; National Natural Science Foundation of China(41425013 ; 41490631) ; Chinese Academy of sciences (CAS) ; The World Academy of sciences (TWAS) ; National Natural Science Foundation of China(41425013 ; 41490631) ; Chinese Academy of sciences (CAS) ; The World Academy of sciences (TWAS) ; National Natural Science Foundation of China(41425013 ; 41490631)
源URL[http://ir.iggcas.ac.cn/handle/132A11/61983]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者He, Huaiyu
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Guilin Univ Technol, Inst Meteorites & Planetary Res, Guilin 541004, Peoples R China
4.Guilin Univ Technol, Key Lab Planetray Geol Evolut, Guilin 541004, Peoples R China
推荐引用方式
GB/T 7714		 Ranjith, P. M.,He, Huaiyu,Miao, Bingkui,et al. Petrographic shock indicators and noble gas signatures in a H and an L chondrite from Antarctica[J]. PLANETARY AND SPACE SCIENCE,2017,146:20-29.
APA Ranjith, P. M..,He, Huaiyu.,Miao, Bingkui.,Su, Fei.,Zhang, Chuantong.,...&Zhu, Rixiang.(2017).Petrographic shock indicators and noble gas signatures in a H and an L chondrite from Antarctica.PLANETARY AND SPACE SCIENCE,146,20-29.
MLA Ranjith, P. M.,et al."Petrographic shock indicators and noble gas signatures in a H and an L chondrite from Antarctica".PLANETARY AND SPACE SCIENCE 146(2017):20-29.

入库方式： OAI收割

来源：地质与地球物理研究所

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