Abstract The Daqingshan area is located in the Khondalite belt in the northern margin of the North China Craton. It has the best-preserved Mesozoic basin and is an ideal area for research on Jurassic strata. Sandstones mainly contain quartz and feldspar, with significantly less debris content. In addition, petrography and geochemical classifications have revealed the presence of arkose and wacke. Chondrite-normalized rare earth element patterns of samples are characterized by the enrichment of light rare elements and the flat trend toward heavy rare earth elements. Petrography and source rock discrimination diagrams of geochemical data suggest the presence of felsic rock and Precambrian basement in the northern and southern parts of the basin, which are crucial source areas; however, few mafic materials occur in the Wudanggou Formation. Tectonic discrimination diagrams of geochemical data show that the source materials were deposited on an active continental margin and/or continental island arc. Petrological and geochemical data from the Wudanggou Formation and Changhangou Formation samples suggest that the Yanshan movement influenced the formation of the Changhangou Formation.

中文翻译：

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碎屑沉积岩岩石学和地球化学作为大青山地区侏罗系物源的证据

摘要 大青山地区位于华北克拉通北缘孔达岩带。它拥有保存最完好的中生代盆地，是侏罗纪地层研究的理想地区。砂岩主要含有石英和长石，碎屑含量明显较少。此外，岩石学和地球化学分类揭示了长石和瓦克的存在。样品的球粒陨石归一化稀土元素分布特征是轻稀土元素富集，重稀土元素趋势平坦。地球化学数据的岩石学和烃源岩判别图表明，盆地北部和南部是重要的源区，存在长英质岩和前寒武纪基底；而武当沟组中的基性物质很少。地球化学数据的构造判别图表明，源材料沉积在活动大陆边缘和/或大陆岛弧上。武当沟组和长汉沟组样品的岩石地球化学数据表明，燕山运动影响了长汉沟组的形成。