摘要
根据地层发育程度和岩石组合特征,以萍乡—广丰深断裂和三南(全南、龙南、定南)—寻乌深断裂为界,可将江西及广东北部侏罗系—白垩系划分为北部、中部、南部三个地层分区。根据不整合面和岩石组合特征,以群级岩石地层单位与火山旋回或沉积旋回相对应为原则,北部地层分区可划分出林山群、火把山群和龟峰群;中部地层分区可划分出林山群、武夷群、罗塘群和龟峰群;南部地层分区可划分出余田群、武夷群、兴宁群和南雄群。根据岩性岩相特征,以组级岩石地层单位与沉积岩相或火山岩相组合相对应为原则,林山群可划分为水北组和罗坳组,余田群可划分为水头迳组、菖蒲组和翰岗组,武夷群划分为双峰岭组、鹅湖岭组和石溪组,兴宁群划分为合水组和优胜组,罗塘群划分为白埠组、周田组和邓家组,火把山群划分为丘家组、天台山组、冷水坞组和周家店组,龟峰群划分为河口组、塘边组和莲荷组,南雄群划分为大凤组、主田组和浈水组。根据火山岩锆石U-Pb年龄数据和化石资料,余田群和林山群属相变关系,地质时代属早侏罗世—中侏罗世早期。武夷群属早白垩世早期,火把山群属早白垩世中期,罗塘群属早白垩世晚期,兴宁群属早白垩世晚期—晚白垩世早期,龟峰群和南雄群属相变关系,地质时代属晚白垩世中晚期。通过岩性岩相对比,结合火山岩锆石U-Pb年龄数据,鹰潭冷水坑矿区的火山岩系属早白垩世早期武夷群,广东始兴—江西全南原武夷群火山岩系属晚奥陶世—早志留世早期龙头寨群。
Based on the degree of stratigraphical development and characteristics of rock associations, the Jurassic-Cretaceous strata in Jiangxi Province and Northern Guangdong Province can be subdivided into northern, central and southern district bounded by the Pingxiang-Guangfeng fault and Sannan (Quannan, Longnan and Dingnan)-Xunwu fault. Based on the unconformity and rock associations and the assumption that “Group” corresponds to volcanic or sedimentary cycles, the northern stratigraphical district can be subdivided into Linshan Group, Huobashan Group, and Guifeng Group;the central stratigraphical district can be subdivided into Linshan Group, Wuyi Group, Luotang Group, and Guifeng Group;the southern stratigraphical district can be subdivided into Yutian Group, Wuyi Group, Xingning Group, and Nanxiong Group. According to the lithology and lithofacies and the assumption that a formation corresponds to a sedimentary lithofacies or volcanic lithofacies association, the Linshan Group can be subdivided into Shuibei Formation (Fm) and Luoao Fm;the Yutian Group into the Shuitoujing Fm, Changpu Fm and Hangang Fm;the Wuyi Group into Shuangfengling Fm, Ehuling Fm, and Shixi Fm;the Xingning Group into Heshui Fm and Yousheng Fm;the Luotang Group into the Baibu Fm, Zhoutian Fm, and Dengjia Fm;the Huobashan Group into the Qiujia Fm, Tiantaishan Fm, Lengshuiwu Fm, and Zhoujiadian Fm;the Guifeng Group into the Hekou Fm, Tangbian Fm, and Lianhe Fm and the Nanxiong Group into the Dafeng Fm, Zhutian Fm, and Zhenshui Fm. Fossil data and zircon U-Pb ages show that the Yutian Group and Linshan Group belong to the Early Jurassic-early Middle Jurassic, the Wuyi Group to early Early Cretaceous, the Huobashan Group to middle Early Cretaceous, the Luotang Group to late Early Cretaceous, the Xingning Group to early Late Cretaceous-early Late Cretaceous, the Guifeng Group and the Nanxiong Group belong to late Late Cretaceous. The contrast in lithology and lithofacies, together with zircon U-Pb age data of the volcanic rocks , the volcanic series belong to the Wuyi Group of the early Early Cretaceous in the Lengshuikeng mining area, and the volcanic series of the original the Wuyi Groupis belong to the Longtouzhai Group of the Late Ordovician-early Early Silurian in Shixing (Guangdong Province)-Quannan (Jiangxi Province).
作者
巫建华
韦昌袭
郭恒飞
郭国林
刘帅
WU Jianhua;WEI Changxi;GUO Hengfei;GUO Guolin;LIU Shuai(State Key Laboratory of Nuclear Resources and Environment,East China University of Technology, Nanchang 330013, China;School of Earth Sciences, East China University of Technology, Nanchang 330013,China)
出处
《高校地质学报》
CAS
CSCD
北大核心
2019年第2期309-320,共12页
Geological Journal of China Universities
基金
国家自然科学基金项目<赣南-粤北相邻区河口-南迳加里东期火山岩研究与铀成矿关系>(41372071)
中国核工业集团公司项目<中国中-新生代铀成矿作用研究>(中核地计[2008] 74号)联合资助
关键词
岩石地层
地质时代
侏罗纪-白垩纪
江西及广东北部
iithostratigraphy
geochronology
Jurassic-Cretaceous system
Jiangxi Province and northern Guangdong Province
