Dating phosphates of the strongly shocked Suizhou chondrite
文献类型：期刊论文
| 作者 | Li, Shaolin1,2; Hsu, Weibiao3 |
| 刊名 | AMERICAN MINERALOGIST
 |
| 出版日期 | 2018-11-01 |
| 卷号 | 103期号:11页码:1789-1799 |
| 关键词 | Apatite tuite L chondrite in situ U-Pb dating early impacts in the solar system |
| ISSN号 | 0003-004X |
| DOI | 10.2138/am-2018-6582 |
| 通讯作者 | Hsu, Weibiao(wbxu@pmo.ac.cn) |
| 英文摘要 | Impacts on undifferentiated asteroidal bodies provide invaluable information for understanding the solar system evolution. Nevertheless, dating early and small-scale impact events is technically challenging. Uranium-lead (U-Pb) systematics of U-bearing phases within shock-induced melt veins (SMVs) of chondrites may be significantly disturbed by localized heating, thus providing opportunities to date these impact events. As one of the major U hosts in chondrites, apatite in the Suizhou (L6) chondrite has been compositionally and structurally modified to varying degrees by shock metamorphism. Apatite grains in the host remained largely intact during the impact and have recorded the initial thermal cooling time (similar to 4550 Ma) on their parent body. Apatite grains in regions less than 100 mu m bordering the SMVs or in relatively "cold" regions within the SMVs were partly decomposed to tuite, driven by the localized transient heating within the SMVs. Their U-Pb systematics were disrupted to varying extents. Apatite in regions close to the center of the SMVs has been completely transformed to tuite, which yields an age of 4481 +/- 30 Ma (2 sigma), providing an upper limit to the impact event. This study clearly demonstrates that by integrating in situ U-Pb isotope analysis with detailed microstructural and compositional analysis of phosphates, it is possible to deduce the timing of early and small-scale celestial impact events, and hence create a more comprehensive understanding of the impact history of the solar system. |
| WOS关键词 | MULTIPLE IMPACT EVENTS ; HIGH-PRESSURE PHASES ; MOON-FORMING IMPACT ; U-PB ; PARENT BODY ; SOLAR-SYSTEM ; ISOTOPE SYSTEMATICS ; VREDEFORT IMPACT ; IMBRIUM IMPACT ; CA-PHOSPHATES |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000448917700009 |
| 出版者 | MINERALOGICAL SOC AMER |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/21057]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Hsu, Weibiao |
| 作者单位 | 1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210034, Jiangsu, Peoples R China 2.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China 3.Macau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Macau 999078, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Shaolin,Hsu, Weibiao. Dating phosphates of the strongly shocked Suizhou chondrite[J]. AMERICAN MINERALOGIST,2018,103(11):1789-1799. |
| APA | Li, Shaolin,&Hsu, Weibiao.(2018).Dating phosphates of the strongly shocked Suizhou chondrite.AMERICAN MINERALOGIST,103(11),1789-1799. |
| MLA | Li, Shaolin,et al."Dating phosphates of the strongly shocked Suizhou chondrite".AMERICAN MINERALOGIST 103.11(2018):1789-1799. |
入库方式： OAI收割
来源：紫金山天文台
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