江苏省徐州地区新元古界淮河系时代的重新厘定  

Redefining the Neoproterozoic Huaihe group in Xuzhou,Jiangsu Province

作　　者：苗巧银[1,2] 潘明宝 徐士银[1,2] 张平 高炳飞[1,2] 冯文立 MIAO Qiaoyin;PAN Mingbao;XU Shiyin;ZHANG Ping;GAO Bingfei;FENG Wenli(Jiangsu Institute of Geological Survey,Jiangsu Nanjing 210048,China;Key Laboratory of Geologic Hazards of Ground Fissure,Ministry of Natural Resources of China,Jiangsu Nanjing 210048,China)

机构地区：[1]江苏省地质调查研究院,江苏南京210048 [2]自然资源部地裂缝地质灾害重点实验室,江苏南京210048

出　　处：《上海国土资源》2020年第3期72-77,共6页Shanghai Land & Resources

基　　金：中国地质科学院地质科研项目“全国地质构造区划与区域地质调查综合集成——江苏区域地质调查片区总结与服务产品开发”(16CNIC034889-226)。

摘　　要：徐州地区淮河系(城山组—望山组)自建名以来,被划为南华纪地层沿用至今。本文通过近年来众多测年成果、臼齿构造碳酸盐岩分布时限、以及本次测年结果,地层区域对比等众多依据,将南华纪淮河系重新厘定为青白口纪地层,取消使用淮河系这一命名。以往众多学者测年研究成果表明淮河系沉积时限为700-1000 Ma,臼齿构造碳酸盐岩最大峰值的全球分布时限700-900 Ma。通过与吉林、辽宁、山东等地的区域地层对比,以及本次锆石U-Pb测年结果,确定原徐州地区淮河系沉积时代为920 Ma左右,参照《2018年国际年代地层表》青白口系地质年限(720-1000 Ma),因此淮河系时代应归属青白口纪。其对新元古代地层划分具重要意义,为今后地层划分对比起到较重要的导向作用。The Huaihe group(in the Chengshan-Wangshan Formation)in the Xuzhou area has been classified as Nanhuaji strata since they were named.This study redefines the Huaihe group strata as Qingbaikou strata based on recent numerous dating results,the distribution time limit and dating of molar carbonate rocks,regional stratigraphic correlation,and other techniques.Therefore,the name“Huaihe group”should no longer be used.Additional previous research on dating shows that the sedimentary time limit of the Huaihe group is 700-1,000 Ma whereas the global distribution time limit of the maximum peak value of molar carbonate rock is 700-900 Ma.The specific sedimentary time limit of the original Huaihe group was determined to be approximately 920 Ma according to regional stratigraphic correlation of the Jilin,Liaoning,and Shandong and the results of zircon U-Pb dating.Furthermore,according to the geological age of the Qingbaikou system-which is the representative of international stratigraphy and dates from 720-1000 Ma-the Huaihe group in the south China period correctly belongs to the Qingbaikou period;this is of great significance to the Neoproterozoic stratigraphic division and will play an important role in guiding stratigraphic division and correlation in the future.

关 键 词：地层时代 锆石测年 臼齿构造碳酸盐 淮河系 南华纪 青白口纪 徐州地区 

分 类 号：P534.3[天文地球—古生物学与地层学]