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

• 地质与资源 • 上一篇    下一篇

辽西建平马场义县组火山岩LA-ICP-MS锆石U-Pb年龄及其地质意义

陈井胜1,2, 李崴崴3, 刘淼1,2, 邢德和2, 杨佳林2   

  1. 1. 吉林大学地球科学学院, 长春 130061;
    2. 沈阳地质矿产研究所/中国地质调查局沈阳地质调查中心, 沈阳 110034;
    3. 辽宁省地质矿产研究院, 沈阳 110029
  • 收稿日期:2014-07-16 发布日期:2015-03-26
  • 作者简介:陈井胜(1983-),男,博士研究生,主要从事岩石学方面研究,E-mail:5202268@qq.com
  • 基金资助:

    中国地质调查局区域地质大调查项目(1212011120662,1212011085210)

U-Pb Isotopic Age of the Volcanic Rocks of the Yixian Formation in Jianping Machang of Western Liaoning and Its Geological Significance

Chen Jingsheng1,2, Li Weiwei3, Liu Miao1,2, Xing Dehe2, Yang Jialin2   

  1. 1. College of Earth Sciences, Jilin University, Changchun 130061, China;
    2. Shenyang Institute of Geology and Mineral Resources/Shenyang Center of Geological Survey, China Geological Survey, Shenyang 110034, China;
    3. Liaoning Institute of Geology and Mineral Resources, Shenyang 110029, China
  • Received:2014-07-16 Published:2015-03-26

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。

关键词: 义县组, 火山岩, LA-ICP-MS锆石U-Pb年龄, 时代对比, 太平洋板块, 辽西, 建平马场

Abstract:

Yixian Formation volcanic rocks widely exists in Jianping Machang in western Liaoning. Through the study of the measured sections,three volcanic eruption cycles(early,middle and late) have been recognized. A new LA-ICP-MS zircon U-Pb dating of the volcanic rocks in different cycle presents three ages for the three cycles: (the early age (127.7±1.8)-(124.3±1.8) Ma, the middle age (122.3±1.4)-(121.8±1.3) Ma, and the late age (114.9±1.8) Ma. All three cycles fall into the period of Early Cretaceous. In comparison with the different region in western Liaoning,the volcanic activity of this area occurred in the middle to late cycle according to the chronological characteristics. Yixian Formation in different region of western Liaoning was formed asynchronously, in an extension environment of the related subduction of the Paleo-Pacific plate towards the Eurasian continent.

Key words: Yixian Formation, volcanic rocks, LA-ICP-MS zircon U-Pb dating, the age comparison, Paleo-Pacific plate, western of Liaoning, Jianping Machang

中图分类号: 

  • P588.14

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