Non-Impact Origin of the Baisha Structure in Hainan Province, China

作     者：Jiang Pu Zhiyong Xiao Long Xiao Cheng Huang Jiang Pu;Zhiyong Xiao;Long Xiao;Cheng Huang

作者机构：Planetary Science InstituteSchool of Earth SciencesChina University of GeosciencesWuhan 430074China Space Science InstituteMacao University of Science and TechnologyMacaoChina College of Hydraulic and Ecological Engineering Nanchang Institute of TechnologyNanchang 330099China 

出 版 物：《Journal of Earth Science》 (地球科学学刊（英文版）)

年 卷 期：2020年第31卷第2期

页      面：385-392页

核心收录：

学科分类：070904[理学-构造地质学] 0709[理学-地质学] 07[理学] 070901[理学-矿物学、岩石学、矿床学] 0708[理学-地球物理学] 0704[理学-天文学] 

基　　金：The Hainan Geological Survey kindly provided support during the field trip This study was supported by the National Natural Science Foundation of China(Nos.41773063 and 41403053)to Zhiyong Xiao and Jiang Pu the Fundamental Research Funds for the Central Universities,China University of Geosciences(Wuhan)(Nos.CUG180601 and CUG2018JM10) the National Natural Science Foundation of China(No.41772050)to Long Xiao the Natural Science Foundation of Jiangxi Province(No.20171BAB213027)to Cheng Huang 

主　　题：impact crater shock metamorphism differential erosion 

摘      要：The Baisha Structure,with a rim-to-rim diameter of^3.7 km,in the center of the Hainan Province,southern China has been considered to be an impact *** investigation and petrological study are presented in this paper to investigate the impact hypothesis for this ***^600-m-thick Lower Cretaceous feldspathic quartz sandstones from the Lumuwan Formation are the major outcrops both within and outside of the *** amphitheater-shaped rim of the structure is composed of granite porphyries that are intruded in the Lumuwan *** interpreted impact breccia and impact melt rocks are actually granite porphyries different cooling rates and weathering *** from locations that most likely have recorded shock metamorphic signatures are sampled,but petrographic analyses reveal no indications of shock *** subtle structural deformation occurs at the contact boundary between the granite porphyries and the feldspathic quartz sandstones,the feldspathic quartz sandstones exhibit uniformed dipping strata across the crater floor and *** the evidence suggests that the Baisha Structure was not formed by impact *** most likely has been shaped by a combination of magmatic intrusion and long-term differential erosion.