对江西晚白垩世赣州群茅店组的重新厘定  

Revision of the Late Cretaceous Maodian Formation of the Ganzhou Group in Jiangxi Province

作　　者：衷存堤[1] 徐平 肖晓林 王迪文 龙天 

机构地区：[1]中国地质大学,湖北武汉430074 [2]江西省地质调查院,江西南昌向塘330201

出　　处：《中国地质》2002年第3期271-274,共4页Geology in China

基　　金：中国地质调查局区域地质调查项目

摘　　要：根据1∶5万区调最新成果资料,对《江西省岩石地层》中的赣州群茅店组进行了重新厘定,在原茅店组正层型剖面上,识别出了5种不同性质的沉积界面,即沉积不整合界面、超覆不整合界面、平行不整合界面、相转变面、同相叠复面,从而将原茅店组划分为两个不同的组级岩石地层单位。按照岩石地层单位的命名原则,超覆不整合面之下的原茅店组中下部层位划归赣州群茅店组,其中发育的一套玄武岩-火山碎屑沉积岩组合单独划出,新建为陈坑火山岩段;超覆不整合面之上的原茅店组上部层位的粗碎屑沉积岩,则划归晚白垩世灌溪群宏冈组?。重新厘定的茅店组仅相当于原正层型茅店组的中、下部层位,且可细分为下段、陈坑火山岩段和上段。On the basis of the latest data of 1∶50000regional geol og ical mapping,the authors revise the Maodian Formation of the Ganzhou Group in the Lithostratigraphic units of Jiangxi Province.Five types of sedimentary i nterfaces of different natures are identified in the orthostratotype of the o riginal Maodian For-mation;they are the sedimentary unconformity,overlapping unconformity,disconformi ty,facies change surface,and synthetic stacked surfa ce,and thus the original Maodian Formation is divided into two differ-ent f ormation-rank lithostratigraphic units.According to the naming principle of l ithostratigraphic units,the middle and lower horizons of the original Maodian Formation below the overlapping unconformity are as-signed to the Maodian Form ation of the Ganzhou Group,and the association of basalt-pyroclastic-sedi- mentary rocks developed in the horizons is separated from the horizons and the Chenkeng Volcanic Mem-ber is established separately.The coarse clastic sedime ntary rocks in the upper part of the original Maodian Formation above the overl apping unconformity are assigned to the Honggang Formation of the Late Creta-c eous Guanxi Group.The revised Maodian Formation only corresponds to the middl e and lower horizons of the original orthostratotype Maodian Formation,and it is subdivided into three members,i.e.the Lower Member,Chenkeng Volcanic Mem ber,and Upper Member.

关 键 词：重新厘定 茅店组 陈坑火山岩段 晚白垩世 江西 碎屑沉积层 

分 类 号：P534.53[天文地球—古生物学与地层学]