摘要
冀东地区位于华北地台东部燕山台褶带的东段,是我国主要的金矿产出地之一。区内花岗岩大量分布,包括都山、蛇盘兔花岗岩基以及青山口、高家店、贾家山、峪耳崖、罗文峪等岩株。本文对高家店和蛇盘兔岩体进行LA-MC-ICP-MS锆石U-Pb定年和岩石地球化学特征研究。定年结果表明,高家店岩体的成岩时间为(198.8±0.8)Ma,蛇盘兔岩体成岩时间为(184.7±1.0)Ma,岩体形成时代都为早侏罗世。研究区内的岩石为弱过铝质I-A过渡型高钾钙碱性花岗岩类,Na2O+K2O质量分数高,富集大离子亲石元素(LILE)和轻稀土元素(LREE),亏损高场强元素(HFSE),且δEu集中于0.14~0.82,具有明显负铕异常的特性,表明成岩物质来源于壳源,形成于后碰撞环境。
Jidong region,located in the North China platform and eastern Yanshan platform fold belt,is one of the important metallogenetic gold provinces in China.There are plenty of granites in this region,such as Dushan granitic batholith,Shepantu granite batholith,Qingshankou,Gaojiadian,Jiajiashan,Yuerya,and Luowenyu granites.The LA-MC-ICP-MS zircon U-Pb ages of the Gaojiadian and Shepantu granites show that the formationtime of the Gaojiadian granite is(198.8±0.75)Ma,and the Shepantu granite is(184.7±1.0)Ma,belonging to the Early Jurassic of Yanshanian.In the study area,the rocks are of I-A transition type with weakly peraluminous characteristic and high-K calc-alkaline.Among them the Early Jurassic granitoids is much more enriched in(Na2O+K2O),LILE and LREE,and poor in HFSE.Besides,it has obvious negative europium anomaly with theδEu of0.14-0.82.All these show that the diagenetic material came from the shell and mineralized after the collision.
作者
尹业长
郝立波
赵玉岩
石厚礼
田午
张豫华
陆继龙
Yin Yechang;Hao Libo;Zhao Yuyan;Shi Houli;Tian Wu;Zhang Yuhua;Lu Jilong(College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China;No.5 Exploration Institute of Geology and Mineral Resources, Tai’an 271021, Shandong, China;Institute of Geological, Geophysical and Geochemical Exploration, Yunnan Nonferrous Metals Geological Bureau, Kunming 650216, China)
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2018年第2期574-586,共13页
Journal of Jilin University：Earth Science Edition
基金
国家重点研发计划项目(2016YFC0600606)
国土资源部行业专项(SinoProbe-04-05-02)~~
