孙敏,郭知鑫,杨永太,降栓奇,王会来,王名巍

• 1:中国科学院壳幔物质与环境重点实验室中国科学技术大学地球和空间科学学院
• 2:中国石油华北油田分公司勘探开发研究院

摘要(Abstract)：

二连盆地是发育于中国北方地区的一个大型中生代沉积盆地,在传统上一直把盆地内钻井钻遇的大套火山岩地层确定为侏罗纪,但没有精确的同位素定年证据。选择乌里雅斯太凹陷中部的钻井地层首次开展LA-ICPMS锆石U-Pb定年工作,选取和测试了5个锆石样品的年龄,结果显示1个砂岩样品中的锆石年龄为≤125.4±2.6 Ma,4个火山岩样品中的锆石年龄分别为120.7±1.4 Ma、124±13 Ma、151.0±2.9 Ma和152.0±4.4 Ma。结合岩性录井资料和地震反射剖面,对乌里雅斯太凹陷中部晚侏罗世—早白垩世地层进行了重新划分,并在新认识的基础上,探讨了研究区的地质演化历史及侏罗纪末—白垩纪初蒙古—鄂霍次克洋的关闭对凹陷演化的影响。

关键词(KeyWords)： 化学地层;锆石U-Pb定年;蒙古—鄂霍茨克洋;侏罗系;白垩系;乌里雅斯太凹陷;二连盆地;内蒙古

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(No.NSFC41372111)资助

作者(Author): 孙敏,郭知鑫,杨永太,降栓奇,王会来,王名巍

DOI: 10.19839/j.cnki.dcxzz.2017.01.006

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