吉林大学学报(地球科学版) ›› 2015, Vol. 45 ›› Issue (2): 471-482.doi: 10.13278/j.cnki.jjuese.201502111
陈井胜1,2, 李崴崴3, 刘淼1,2, 邢德和2, 杨佳林2
Chen Jingsheng1,2, Li Weiwei3, Liu Miao1,2, Xing Dehe2, Yang Jialin2
摘要：
辽西建平马场地区出露大量的义县组火山岩,通过对其剖面测制研究发现,义县组火山岩可分为早、中、晚三期。对不同时期火山岩样品进行锆石LA-ICP-MS U-Pb 测年,获得本区义县组早期火山岩形成年龄为(127.7±1.8)~(124.3±1.8)Ma,中期火山岩形成年龄为(122.3±1.4)~(121.8±1.3)Ma,晚期火山岩形成年龄为(114.9±1.8)Ma,时代均为早白垩世。通过与义县-北票、阜新-彰武、凌源-建昌地区的义县组对比得知,本区火山岩开始活动较晚,属于义县组活动的中-晚期;其年代学特征显示辽西各个地区义县组顶、底界是不等时的,是形成于太平洋板块向欧亚大陆俯冲后的伸展环境中。
中图分类号:
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