湖北建始黄岩二叠系孤峰组底部陆源碎屑岩的发现

Discovery of the Clastic Rocks in the Basal Part of the Permian Gufeng Formation in Huangyan, Jianshi, Hubei and its Significance

建始黄岩二叠系茅口组顶部呈现一系列岩溶特征 ,而且孤峰组底部产孤立、透镜状河流相碎屑砂岩或砂砾岩。说明在茅口组沉积之后 ,测区曾有一定规模的抬升或海平面的相对下降 ,使得茅口灰岩遭受风化、侵蚀。孤峰组底部有不发育的底水位沉积 ,孤峰组与茅口组之间呈假整合接触。这一发现同时支持孤峰组形成于局限浅水环境的观点。

A series of features of karst are present in the Permian Maokou Limestone in Huangyan, Jianshi, Hubei. The isolated clastic rocks formed by river were recently found at the base of the Gufeng Formation. It was proved that the area rose or the sea floor fell after the Maokou Formation was deposited there is an unconformity between the Maokou and Gufeng Formations. This discovery supports the view that the Gufeng Formation was deposited in a restricted shallow water environment.