U.S.-China Cooperative Research: Search for and Study of Impact Structures in China

中美合作研究：中国冲击结构的探索与研究

• 批准号: 8900038
• 负责人: Virgil Sharpton
• 金额: $ 1.74万
• 依托单位: Universities Space Research Association
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-09-15 至 1993-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8900038&HistoricalAwards=false
• 关键词: U.S.; China; Cooperative; Research; Search

This proposal on "Search for and Study of Impact Structures in China" between Drs. V.L. Sharpton and Kevin Burke of the Lunar and Planetary Institute of the Universities Research Association Inc. and Professor XU Dao.Yi and HE Yong.Nian of the Institute of Geology, State Seismological Bureau, People's Republic of China is sponsored by NSF. Approximately 120 impact structures recognized worldwide document the nature and effects of asteroidal and cometary collisions with Earth. While such structures are obscured readily by subsequent geological processes, the clustered spatial distribution within North American, Europe, and Australia clearly illustrates the usefulness of intensive efforts to search for these structures and the potential for initiating such efforts within the remaining continental regions. For vast landmass of China, crater production calculations suggest 10.15 craters with diameters (D) greater than 20 km should be present but none have been substantiated. The American researchers have documented 41 circular structures (3 km D 70 km) using orbital imagery of China, all but a few, however, appear to be endogenic. The most promising structures include Duolun, Shanghewan, Londoushe, Neidong and Tai Hu Lake. To date, clear petrographic evidence of an impact origin for any of these features has not been demonstrated. This study of impact craters in China will be achieved by (1) extensive field study of the 5 aforementioned structures in China, and (2) field study of 8 recognized impact structures in North America, to provide the Chinese with an understanding of impact structures. This effort, involving structural mapping and sample collection for petrographic analysis and isotopic dating, will provide, in the short term, a clearer understanding of the origin of the targeted Chinese structures, and in the short term, the basis for continuing effort to search for impact structures in China.

关于“寻找和研究撞击结构”的建议 V.L.博士之间的“中国” 月球的夏普顿和凯文伯克 大学研究协会行星研究所 Inc.研究所徐道毅教授、何勇年教授 中华人民共和国国家地震局地质研究所 中国由NSF赞助。 全球约有120个影响结构得到认可 记录小行星和彗星的性质和影响 与地球的碰撞 虽然这些结构被掩盖， 通过随后的地质作用， 北美、欧洲和澳大利亚的空间分布 这清楚地表明， 寻找这些结构和潜在的启动 在其他大陆区域内开展这种努力。 为广大 中国大陆，陨石坑生产计算表明10.15 应存在直径（D）大于20公里的陨石坑 但都没有得到证实 美国研究人员已经 记录了41个圆形结构（3公里D 70公里），使用 中国的轨道图像，除了少数，然而，似乎是 内生的 最有前途的结构包括多伦， 上河湾、龙都社、内洞、太湖。 迄今为止， 这些陨石撞击的岩石学证据 特征尚未得到证实。 中国撞击坑的研究将通过（1） 对上述5种结构进行了广泛的实地研究， 中国，以及（2）8个公认的影响结构的实地研究， 北美，让中国人了解 影响结构。 这项工作，包括结构绘图， 并采集样品进行岩相分析和同位素分析 约会，将提供，在短期内，一个更清晰的理解， 目标中国结构的起源，并在 短期内，继续努力寻求影响的基础 中国的结构。