浙西北下侏罗统王沙溪组的建立

Establishment of the Lower Jurassic Wangshaxi Formation in northwestern Zhejiang

摘要: 王沙溪组为梅城镇幅等4幅1∶5万区域地质调查中新建的岩石地层单位,系指下侏罗统一套由硅质碎屑岩组成的单陆屑建造,地层厚度60～180m;分布于江山-绍兴断裂带以北扬子地层区江南地层分区(或称浙西北区)。此前属下中侏罗统马涧组底部的一套浅灰白色石英砂砾岩、砂岩组合,因工作程度不够而未正式建组。2001—2003年,常山县幅等2幅1∶5万区调工作对此作了进一步研究,并测制了浙江省常山县大桥乡白壳垅村王沙溪组剖面。

Abstract: The Wangshaxi Formation is a lithostratigraphic unit newly established during 1:50000 regional geological survey of four sheets such as the Meichengzhen Sheet in northwestern Zhejiang. It consists of a Lower Jurassic monomict sequence composed of siliceou