New evidence for an impact origin of Taihu lake, China: Possible trigger of the extinction of LiangChu Culture 4500 years ago

Details New evidence for an impact origin of Taihu lake, China: Possible trigger of the extinction of LiangChu Culture 4500 years ago New evidence for an impact origin of Taihu lake, China: Possible trigger of the extinction of LiangChu Culture 4500 years ago

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmmr12a..07x&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #MR12A-07

Physics

1028 Composition Of Meteorites (3662, 6240), 1160 Planetary And Lunar Geochronology, 3625 Petrography, Microstructures, And Textures, 3944 Shock Wave Experiments, 8136 Impact Phenomena (5420, 6022)

Scientific paper

Here we report new evidence of an impact crater in south-east of China, Taihu Lake in Jiangsu Province. An impact origin was originally proposed on the basis of fractured quartz, wavy extinction quartz, and shatter cones in the sandstone of Devonian Wutong formation in the islands of Taihu lake (Wang, et al., 1992, 1993, 2000). In the absence of additional evidence, the impact origin hypothesis has fallen into disfavour. Here we report studies of sedimentary samples, which could be ejecta from Taihu, found in a small lake in the vicinity of Taihu lake. The samples consist of irregularly-shaped quartz-rich concretions found in lake sediments. Preliminary studies indicate that these samples contain angular fragments of shocked quartz. The stratigraphic age of the lake sediments is similar to that of the 65 km diameter Taihu lake. If the impact origin of Taihu lake can be conclusively established, it is of the correct age to explain the mysterious disappearance of the LiangChu culture about 4500 years ago.

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