<SPAN style="COLOR: black; FONT-SIZE: 14pt; mso-font-kerning: 18.0pt; mso-bidi-font-weight: bold" lang=EN-US><FONT face="Times New Roman">Discovery of Impact Ejecta from Taihu <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:place w:st="on"><st1:PlaceType w:st="on">Lake</st1:PlaceType> <st1:PlaceName w:st="on">Impact</st1:PlaceName></st1:place> Crater <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></FONT></SPAN>

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Discovery of Impact Ejecta from Taihu Lake Impact Crater

详细信息

责任者：Wang Henian (State Key Laboratory for Mineral Deposits Research ; School of Earth Sciences and Engineering ; Nanjing University ; Nanjing 210093 ; China) ; Xie Zhidong
刊名：Geological Journal of China Universities
出版年：2009
卷期：15(4)
关键词：陨石坑 ; meteor craters ; 陨击作用 ; meteorite impacts ; 太湖 ; Taihu Lake
页码：p.437-444
图表：6 illus., 15 refs.
分类号：0100
issnNo：ISSN1006-7493
isbnNo：CN32-1440/P

摘要

The hypothesis of impact origin of the Taihu Lake was proposed about twenty years ago, but never confirmed. Recently some weird-shaped concretions were found embedded in the mud layer in the vicinity of the Taihu Lake, which might be impact ejecta from the Taihu impact crater. These new samples comprise two categories. One is rich in iron with fine siderite as concretion matrix, including abundant small spheroid concretions, stick-shaped concretions, and irregular shaped concretions. The other one is poor in iron with calcite as concretion matrix, including twisted-shaped concretions. All these features suggest that these new samples once experienced a series of the impact cratering processes, such as the shock-induced fragmentation, shock-induced melting, and ejection into the air, flying in the air, and falling in and around the impact crater.

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