Taihu crater: New evidence of impact metamorphism in sedimentary rocks, Taihu Lake, Jiangsu, China

被引：0
作者：
Wang, Henian [1 ]
Chen, Yang [1 ]
Sheng, Xuefeng [1 ]
Qian, Handong [1 ]
机构：
[1] School of Earth Sciences and Engineering, Nanjing University, Nanjing
来源：
Earth Science Frontiers | 2024年 / 31卷 / 06期
关键词：
impact crater; impact melting; impact metamorphism; shatter cones; Taihu Lake; target rock;
D O I：
10.13745/j.esf.sf.2024.8.30
中图分类号：
学科分类号：
摘要：
This paper summarizes the results of fifteen years of research on the area surrounding Taihu Lake and its inner islands. Taihu Lake exhibits diagnostic features of an impact crater, including shatter cones, impact-metamorphosed breccias, and evidence of impact metamorphism in quartzite (PDFs and PFs) and impact melting. The ideal profile of an impact crater, comprising a vaporized melt zone, an impact metamorphic zone, impact-metamorphosed breccias, and a fracture zone, is fully present, confirming the existence of the Taihu impact crater. A schematic map of the distribution of impact metamorphism in Taihu has been compile based on these diagnostic features. For the first time, the Taihu impact crater, previously speculated from satellite images, has been confirmed in the Taihu Lake area, laying a solid foundation for further research. The distribution of impact metamorphism in Taihu can be divided into two concentrated zones and one ejecta distribution zone. These zones are located in the interior and edges of the lake area, primarily concentrated in the central and southern parts of Taihu Lake, indicating a relationship between the impact crater and the formation, evolution, and development of Taihu Lake. The Taihu impact crater, located in a fold belt at the margin of a Continental platform with target rocks of sedimentary limestone and porous quartz sandstone, represents a new type of impact crater with many novel impact metamorphic phenomena and characteristics. The paper introduces the diversity, new features, and new types of shatter cones; reveals new characteristics of impact metamorphic PDFs in porous quartz sandstone; and describes new phenomena such as silica glass formed by intergranular shear friction-local melting and solidified melt inclusions. These findings enrich and advance the understanding of new characteristics and theories related to impact metamorphism in sedimentary rocks. © 2024 Science Frontiers editorial department. All rights reserved.
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页码：320 / 330
页数：10
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