辽宁省黑水镇地区中生代断陷盆地分析

通过对辽宁省朝阳市建平县黑水镇地区中生代沉积盆地的调查,系统采集盆地周缘出露好、较为新鲜的侵入岩、火山岩样品,对其进行锆石激光剥蚀等离子体质谱(LA-ICP-MS)U-Pb同位素测试.分析得出此盆地奠基于早三叠世-晚侏罗世侵入岩之上,其盆地基底为义县组火山岩,根据孢粉样品测试及沉积特征分析可知,盆地依次充填下白垩统九佛堂组、阜新组、上白垩统孙家湾组地层.结合钻孔资料对比研究,建立了盆地演化模型,盆地北缘控盆断裂为同沉积构造,是形态呈簸箕状展布的断陷盆地.

Analysis of Mesozoic Faulted Basin in Heishui Town,Liaoning Province

Based on a survey of Mesozoic sedimentary basin in Heishui Town， Jianping County， Chaoyang City， Liaoning Province， the intrusive and volcanic rocks with good peripheral exposure and fresh at the basin edge were sampled systematically， whose chronology was tested through zircon with (LA-ICP-MS) U-Pb isotopic method. It was concluded that the basin was based on the intrusive rocks which formed during the early Triassic to the late Jurassic， and the basin basement is composed of the volcanic rocks of Yixian Formation. Based on the sporopollen testing and sedimentary characteristics， it was found that the basin is composed of lower Jiufotang Formation， Fuxin Formation in lower Cretaceous and Sunjiawan Formation in upper Cretaceous. By combining the borehole data， an evolution model of the basin could be established. The faults at the northern edge of the basin are contemporaneous structure， and the base is a graben basin in the shape of dustpan.