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冀东高家店和蛇盘兔花岗岩体:年代学、地球化学及地质意义
引用本文:尹业长,郝立波,赵玉岩,石厚礼,田午,张豫华,陆继龙.冀东高家店和蛇盘兔花岗岩体:年代学、地球化学及地质意义[J].吉林大学学报(地球科学版),2018(2):574-586.
作者姓名:尹业长  郝立波  赵玉岩  石厚礼  田午  张豫华  陆继龙
作者单位:吉林大学地球探测科学与技术学院,长春,130026 山东省第五地质矿产勘查院,山东 泰安,271021 云南省有色地质局地质地球物理化学勘查院,昆明,650216
基金项目:国家重点研发计划项目,国土资源部行业专项,Supported by National Key Research and Development Program,Specific Funds of Ministry of Land and Resources
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。

关 键 词:冀东  花岗岩  LA-MC-ICP-MS锆石U-Pb定年  地球化学特征  构造环境  金矿  eastern  Hebei  Province  granite  LA-MC-ICP-MS  zircon  U-Pb  dating  geochemical  characteristics  tectonic  environments  gold  deposit

Gaoj iadian Granite and Shepantu Granite in Eastern Hebei Province:Chronology,Geochemistry and Geological Significances
Yin Yechang,Hao Libo,Zhao Yuyan,Shi Houli,Tian Wu,Zhang Yuhua,Lu Jilong.Gaoj iadian Granite and Shepantu Granite in Eastern Hebei Province:Chronology,Geochemistry and Geological Significances[J].Journal of Jilin Unviersity:Earth Science Edition,2018(2):574-586.
Authors:Yin Yechang  Hao Libo  Zhao Yuyan  Shi Houli  Tian Wu  Zhang Yuhua  Lu Jilong
Abstract: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 the δEu of 0.14-0.82.All these show that the diagenetic material came from the shell and mineralized after the collision.
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