甘肃中西部龙首山一带“韩母山群”的重新厘定  

Redefining of the Hanmushan Group in Longshoushan,central-western Gansu Province

作　　者：校培喜[1] 由伟丰 曹宣铎[1] 胡云绪[1] 谢从瑞[1] 

机构地区：[1]中国地质调查局西安地质矿产研究所,陕西西安710054 [2]中国石油化工股份有限公司石油勘探开发研究院,北京100083

出　　处：《地质通报》2011年第8期1228-1232,共5页Geological Bulletin of China

基　　金：中国石化前瞻性研究项目<走廊--阿拉善地区岩相古地理研究与编图>

摘　　要：关于甘肃龙首山一带"韩母山群"的划分和时代归属,前人曾有不同的认识。依据沉积建造、古生物化石、变质变形等资料,对韩母山群进行解体。将该群下部变质变形较强的烧火筒沟组(钙质砾岩、细碎屑岩夹碳酸盐岩建造)厘定为震旦系,上部变质变形较弱的草大坂组(碎屑岩、碳酸盐岩建造)厘定为寒武系,并将后者与鄂尔多斯西缘下、中寒武统对比。Based on the information of sedimentary structure,fossils and metamorphic-deformation,the authors hold that the Shaohuotonggou Formation in the lower part of Hanmushan Group,which has high-grade metamorphic conglomerate,fine-grained clastic rock and carbonate assemblages,was formed in Sinian.Whereas the Caodaban Formation in the upper Hanmushan Group,which is characterized by clastic rock and carbonate assemblage of relatively low-grade metamorphism,was formed in Cambrian.The Caodaban Formation is comparable with the Lower and Middle Cambrian strata in the western margin of Ordos basin.

关 键 词：甘肃中西部 韩母山群 烧火筒沟组 草大坂组 震旦系 寒武系 

分 类 号：P534.31[天文地球—古生物学与地层学] P534.41[天文地球—地质学]