• 论文 •

太湖三山岛击变岩的发现及其意义

1. 1. 南京大学大地海洋科学系;
2. 南京大学地球科学系;
3. 南京化工学院硅工系
• 出版日期:1990-04-15 发布日期:1990-04-15
• 基金资助:

THE DISCOVERY OF SHOCK METAMORPHIC ROCKS AT SANSHAN ISLAND OF TAIHU LAKE AND ITS SIGNIFICANCE

Fu Chengyi1, Yu Jinbiao1, Wang Ciyin2, Yen Zhenfu2, Yin Lin2, Hu Zhihong2, Li Xiupin1, Fu Guofei1

1. 1. Department of Geo and Ocean science, Nanjing University;
2. Department of Earth Science Nanjing University;
3. Chemical Engneering Institute of Nanjing
• Online:1990-04-15 Published:1990-04-15

Abstract: In Sanshan islet of Taihu lake, several peculiar stones, identified to be well-developed shock metamorphic rocks, were first found by the authors. It is suggested that they were formed by the impact of an ancient giant meteorite on the Devonian quartzitic sandstones of the Wutong Lorma-tion. Macroscopically, they do show some distinct disintegration partings. And microscopically, they are characterized by the development of bending of quartz grains, the presence of multiple sees of planur features, mechanical twining quartz crystals, the existence of diaplectic glasses, 1e-chatelerites and the radiating fractures in quartz grains which were thought to be caused by the process of phase transformation from the precursor mineral coesite to ordinary quartz. All these phenomena might attribute to a peculiar geologic event caused a sudden impact of a rne-teorite onto the ground surface. This discovery might cast a new light on the origin of Taihu lake, and it might be regarded as an important breakthrough in such a research field.