织纳煤田中寨矿区晚二叠世泥岩地球化学特征及沉积环境意义

摘要

对采自织纳煤田中寨矿区ZZ808钻孔晚二叠世泥岩地球化学特征及沉积环境进行了研究.结果表明:区内亲石元素Ti、V、Cr、Ba、Cs,亲铜元素Cu、Zn及亲铁元素Co和Ni等相对富集,Mo、Cs等元素有所亏损;轻稀土富集、重稀土亏损,Eu元素微弱或无负异常、Ce元素微弱负异常.地化特征参数显示研究区古气候属于偏于温湿气候,古水体为还原环境,泥岩沉积主要受到海水的影响,但整体上为过渡相的三角洲或潟湖沉积;物源以基性岩、玄武岩为主,主要来自大陆岛弧及被动大陆边缘,显示出研究区晚二叠世整体处于缓慢沉降状态,没有强烈构造变动的构造背景.%The study of late Permian mudstone geochemical features and sedimentary environment of samples from borehole ZZ 808 in the Zhongzhai mine area, Zhina coalfield has shown that the lithophile elements Ti, V, Cr, Ba and Cs, chalcophile elements Cu, Zn and siderophile elements Co, Ni are relatively enriched in the area;Mo, Cs etc. deficit somewhat;light rare earth elements enriched, heavy rare earth elements deficit;Eu sparklet or no negative anomaly, Ce slight negative anomaly. The geochemical characteristic parameters have shown that the paleoclimate in the area was partial to warm and wet, fossil water body in reduction environment. Mud deposits were mainly impacted by sea water, transitional facies delta or lagoon deposits as a whole. Provenance is mainly basic rocks including basalt from continental island arc and passive continental margin that revealed the study area was in gentle subsidence status during late Permian with no strong tectonism background.