甘肃中西部龙首山一带“韩母山群”的重新厘定

刊出日期: 2011-08-15

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

Publish Date: 15 August 2011

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。
- 甘肃中西部 /
- 韩母山群 /
- 烧火筒沟组 /
- 草大坂组 /
- 震旦系 /
- 寒武系
Abstract: 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.
- central-western Gansu /
- Hanmushan Group /
- Shaohuotonggou Formation /
- Caodaban Formation /
- Sinian /
- Cambrian