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DOI | 10.1007/s11430-010-0015-1 |
Cosmogenic Ne-21 concentrations and exposure ages of summit bedrocks in the Grove Mountains, Antarctica | |
Kong Ping; Ding Lin; Lai QingZhou; Huang FeiXin | |
通讯作者 | Kong, P (通讯作者) |
发表日期 | 2010 |
ISSN | 1674-7313 |
起始页码 | 518 |
结束页码 | 521 |
卷号 | 53期号:4 |
英文摘要 | Various sources of Ne-21 and Ne-22 exist in surface rocks: cosmogenic, in situ nucleogenic from internal U and Th, trapped crustal nucleogenic and trapped atmospheric. This paper reports the first measurement, in China, of cosmogenic Ne-21 and Ne-22 in surface bedrocks. We developed a unique sample pre-treatment procedure that effectively removed inclusions inside quartz grains, and thus maximally reduced nucleogenic contributions of Ne-21 and Ne-22. Step-heating experiments show that concentrations of cosmogenic Ne-21 and Ne-22 in summit bedrock samples R9202 and R9203 from Grove Mountains, Antarctica, are (3.83 +/- 0.87)x10(8) and (5.2280.51)x10(8) atoms/g, respectively. The corresponding minimum exposure ages are 2.2 +/- 0.5 and 3.0 +/- 0.3 Ma. This indicates that the ice sheet in East Antarctica was uncovered the crest of Mount Harding, a typical nunatak in Grove Mountains, since at least mid-Pliocene. |
关键词 | TERRESTRIAL ROCKSQUARTZMALANDSCAPENUCLIDESHISTORYEROSIONBURIALCANYONNEON |
英文关键词 | Ne-21; cosmogenic nuclide; exposure age; Antarctica; Grove Mountains |
语种 | 英语 |
WOS研究方向 | Geology |
WOS类目 | Geosciences, Multidisciplinary |
WOS记录号 | WOS:000276912200004 |
来源期刊 | SCIENCE CHINA-EARTH SCIENCES |
来源机构 | 中国科学院青藏高原研究所 |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/257746 |
推荐引用方式 GB/T 7714 | Kong Ping,Ding Lin,Lai QingZhou,et al. Cosmogenic Ne-21 concentrations and exposure ages of summit bedrocks in the Grove Mountains, Antarctica[J]. 中国科学院青藏高原研究所,2010,53(4). |
APA | Kong Ping,Ding Lin,Lai QingZhou,&Huang FeiXin.(2010).Cosmogenic Ne-21 concentrations and exposure ages of summit bedrocks in the Grove Mountains, Antarctica.SCIENCE CHINA-EARTH SCIENCES,53(4). |
MLA | Kong Ping,et al."Cosmogenic Ne-21 concentrations and exposure ages of summit bedrocks in the Grove Mountains, Antarctica".SCIENCE CHINA-EARTH SCIENCES 53.4(2010). |
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