吉林省蛟河市王家沟火山岩地球化学特征及其地质意义  

Geochemical features and geological significance of Wangjiagou volcanic rocks in Jiaohe City,Jilin Province

作　　者：陈明[1] 王存柱 任龙 曲洪晔[3] CHEN Ming;WANG Cun-zhu;REN Long;QU Hong-ye(Regional Geological and Mineral Resources Survey of Jilin Province,Changchun 130022,Jilin,China;Mudanjiang Natural Resources Comprehensive Survey Center,China Geological Survey,Mudanjiang 157000,Heilongjiang,China;Institute of Geological Survey of Jilin Province,Changchun 130102,Jilin,China)

机构地区：[1]吉林省区域地质矿产调查所,吉林长春130022 [2]中国地质调查局牡丹江自然资源综合调查中心,黑龙江牡丹江157000 [3]吉林省地质调查院,吉林长春130102

出　　处：《吉林地质》2020年第4期69-74,94,共7页Jilin Geology

摘　　要：王家沟火山岩出露于吉林省中部蛟河地区,岩石岩性以安山岩、玄武安山岩为主,根据岩石特征将其划归为四合屯组火山岩。根据20个测点得到U-Pb同位素测年结果在222. 4~232. 9 Ma之间,加权平均年龄为(228. 7±2. 2) Ma (n=20,MSWD=0. 22),时代相当于晚三叠世,很可能为区域由古亚洲洋构造域向太平洋构造域转换的产物。本文对王家沟岩体进行系统研究,探讨其地球化学特征和地质背景。Wangjiagou volcanic rocks are exposed in Jiaohe area,central Jilin Province.The rock lithology is mainly andesite and basaltic andesite.According to the rock characteristics,they are divided into Sihetun Formation volcanic rocks.The U-Pb isotopic dating results from 20 sites range from 222.4~232.9 Ma,and the weighted average age is(228.7±2.2)Ma(n=20,MSWD=0.22),The age is equivalent to the Late Triassic.It is likely to be the product of regional transformation from paleo-Asian Ocean tectonic domain to Pacific tectonic domain.In this paper,the authors made a systematic study of the Wangjiagou pluton and discussed its geochemical characteristics and geological background.

关 键 词：王家沟火山岩 四合屯组 地球化学特征 地质背景 

分 类 号：P595[天文地球—地球化学] P597[天文地球—地质学]