辽西建平烧锅营子金矿花岗岩的锆石U-Pb年代学、地球化学特征及地质意义

发布时间：2018-02-04 22:12

本文关键词： 烧锅营子岩体金矿床锆石U-Pb年代学地球化学动力学背景　出处：《中国地质》2016年02期 　论文类型：期刊论文

【摘要】：辽西建平烧锅营子花岗岩岩体位于华北地台北缘朝阳—赤峰金矿成矿带,岩体周围分布着烧锅营子、撰山子等金矿床或金矿点。与金矿同源关系的岩体主要为二长花岗岩。3个不同粒度的二长花岗岩LA-ICP-MS锆石UPb测年结果分别为(159.1±1.5)Ma、(160.2±4.4)Ma、(160.1±1.1)Ma,表明烧锅营子岩体形成晚侏罗世早期;其周边金矿床也形成于此时期或稍晚。结合前人资料总结认为160 Ma左右是朝阳—赤峰地区一个重要的金矿成矿时期。烧锅营子花岗岩体主量元素以富Si、低Al、中偏低碱、高钾和低Mg、低Ca为特点;微量元素表现出富集Th、Zr、Nd、Rb、K和亏损Ba、Sr、P、Ti的特点,具有强烈的负Eu(δEu=0.08~0.60)、Sr异常。岩石总体上属于经历了高度结晶分异的高钾钙碱性I型花岗岩,Sr-Yb-Y元素特征显示其源区深度为30 km。晚侏罗世整个中国东部处于构造域转折期,结合区域上构造环境分析,烧锅营子岩体是太平洋板块俯冲背景下的弧后伸展环境的产物。
[Abstract]:The Jianping Shaoguiyingzi granite rock body in western Liaoning Province is located in the Chaoyang Chifeng gold mineralization belt of the North China platform and is distributed around the rock mass. The rock bodies with the same relationship with the gold deposit are mainly monzogranites. The UPb dating results of LA-ICP-MS zircon from three different granulites are as follows: (. 159.1 卤1.5 Ma. (1) 160.2 卤4.4 Ma (160.1 卤1.1 Ma), indicating the formation of the early late Jurassic in the Huiguoyingzi rock mass. The gold deposit around the deposit was formed in this period or later. Combined with previous data, it is concluded that 160. About Ma is an important metallogenic period of gold deposits in Chaoyang Chifeng area. The main elements of the zhuangyingzi granite body are rich in Si. It is characterized by low Al, medium and low alkali, high potassium and low Mgand low Ca; The trace elements show the characteristics of enrichment of Th ~ (2 +) Zr ~ (2 +) NdN ~ (2 +) RbN ~ (2 +) K and depletion of Ba ~ (2 +) Sr ~ (2 +) P ~ ((1)) Ti. Sr anomaly. The rocks generally belong to high-potassium calc-alkaline I-type granite with high crystallization differentiation. The characteristics of Sr-Yb-Y elements show that the depth of the source region is 30 km. The whole eastern part of China in late Jurassic is in a tectonic transition period, combined with the analysis of the tectonic environment in the region. The zhuangyingzi rock mass is the product of the back-arc extensional environment in the Pacific plate subduction background.
【作者单位】：地球科学学院吉林大学;沈阳地质调查中心;东北大学秦皇岛分校;辽宁省地质矿产研究院;
【基金】：中国地质调查局地质大调查项目(1212011206662;12120113053400)资助~~
【分类号】：P597.3;P618.51
【正文快照】： About the first author:CHEN Jing-sheng,male,born in 1983,engineer,doctor,majors in mineralogy,petrology and economicgeology;E-mail:5202268@qq.com.Fund support:Supported by China Geological Survey Program(No.1212011206662,12120113053400).赤峰—朝阳金矿化

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