Abstract The Fangniushan supracrustal strata located in Xiaoshan area is one of the best-preserved Paleoproterozoic low grade metasedimentary units exposed in the southern North China Craton, which is mainly composed of quartzite and feldspar quartzite with minor pebbly quartzite and conglomerates. It unconformably contacts with the underlying Taihua Complex and the overlying Paleoproterozoic Xiong’er Group. Ages of the youngest detrital zircons from the quartzites combined with the formation age of the overlying Xiong’er Group bracket the depositional time of the Fangniushan supracrustal strata at ca. 1.87-1.80 Ga. Low CIA (

中文翻译：

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华北克拉通南部萧山地区古元古代房牛山上壳地层年代学和地球化学：对构造演化的启示

摘要 位于萧山地区的房牛山上壳地层是华北克拉通南部出露保存最完好的古元古代低品位变沉积单元之一，主要由石英岩和长石石英岩组成，少量含卵石石英岩和砾岩。它与下伏的太华杂岩和上覆的古元古代熊耳群不整合接触。石英岩中最年轻碎屑锆石的年龄与上覆熊耳群的形成年龄相结合，确定了方牛山上壳地层的沉积时间约为 1.87-1.80 Ga. 低 CIA (