建边农场地区早石炭世侵入岩年代学及构造环境
Chronology and tectonic environment of early Carboniferous intrusive rocks in Jianbian farm area
杨贺平 1石国明 1徐东海 1姜海洋1
作者信息
- 1. 黑龙江省自然资源调查院,哈尔滨 150036
- 折叠
摘要
为研究古亚洲洋的闭合和中晚华力期成矿地质背景,利用岩石地球化学、年代学等方法,研究建边农场地区早石炭世侵入岩的岩石地球化学特征及年代学特征,探讨其构造环境.结果表明:在象鼻山屯东部二长花岗岩中获得一组谐和度较好的锆石年龄,年龄为(330.3±2.1)Ma,成岩时代为早石炭世;岩石地球化学显示该期花岗岩化学成分上属铝弱饱和、钙碱性系列,成因类型为I型;该期岩浆岩对研究古亚洲洋的闭合和中晚华力期成矿地质背景均具有十分重要的意义,显示其为兴安地块与松嫩地块北东向拼合挤压过程由碰撞俯冲向后造山转换过程的产物.
Abstract
This paper aims to study the closing of Paleo-Asian Ocean and the metallogenic geologic setting at Middle and late Hualian age.The study using the methods of petrogeochemistry and chronolo-gy,investigates the petrogeochemical and chronological characteristics behind the early Carboniferous intrusive rocks and the tectonic environme in Jianbian farm area.The results show that a group of good zir-con ages of(330.3±2.1)Ma is obtained from the monzonite granite in eastern part of Xiangbishantun,whose diagenesis age is early Carboniferous epoch.The petrogeochemistry manifests the chemical compo-sition of aluminum-weakly saturated,calc-alkaline series,and the genetic type I on the granites in this stage.The magmatic rocks in this stage demonstrates great significance to the study of the closure of the Paleo-Asian Ocean and the metallogenic geologic setting in the middle and late Hualian stage,which be-long to the products of the transition process from collision subduction to backward orogenesis on Xing'an Block and Songnen Block in the process of convergence and extrusion from the north to the east.
关键词
建边农场地区/锆石U-Pb年龄/构造环境/花岗岩Key words
Jianbian farm area/Zircon U-Pb/tectonic environment/granite引用本文复制引用
基金项目
中国地质调查局"大兴安岭成矿带北段地质矿产调查"项目(12120113053200)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据