黄骅坳陷中生界砂岩地球化学特征及意义

中生代黄骅坳陷位于华北克拉通汇聚与破坏的中心，为各物源的汇集地，记录了华北中生代盆地的构造及物源演化.对研究区中生界砂岩进行了主、微量元素测试分析，结果显示，样品SiO₂、Al₂O₃、Na₂O、K₂O和Fe₂O₃T平均含量分别为66.98%、13.65%、2.74%、3.03%和3.26%，砂岩为岩屑砂岩、长石砂岩和杂砂岩.砂岩CIA和ICV的平均值分别为56.12和0.94，均经历了一定的化学风化及再旋回作用.砂岩的母岩为长英质火成岩和再旋回沉积岩，并混杂少量基性火成岩.由三叠纪到白垩纪，中生界砂岩物源逐渐由华北北缘大陆弧演化为燕山造山带和黄骅坳陷内的岩浆作用及古隆起. 

Geochemical Characteristics and Signatures of Mesozoic Sandstones from Huanghua Depression

In Mesozoic, the Huanghua Depression was located in the center of the convergence and destruction of the North China Craton and was the sink place of all source areas. It recorded the evolution of the tectonic and provenance of the Mesozoic basins in North China. The main and trace elements of Mesozoic sandstones from the study area were examined. It is found that the average contents of SiO₂, Al₂O₃, Na₂O, K₂O, and Fe₂O₃T are 66.98%, 13.65%, 2.74%, 3.03%, and 3.26%, respectively. The sandstones are litharenites, arkoses, and greywackes. The average CIA and ICV values are 56.12 and 0.94, and the sandstones experienced some chemical weathering and recycling. The parent rocks of the sandstones are feldspathic igneous rocks and recycling sedimentary rocks, mixed with a small amount of basic igneous rocks. From the Triassic to the Cretaceous, the source of Mesozoic sandstones gradually evolved from continental arc in the northern margin of North China to the paleo-uplift and the interplate magmatic area of the Yanshan orogenic belt and the Huanghua Depression.