文章摘要
魏小林,甘承萍,于小亮,保善斌.青海扎尔玛格地区晚奥陶世侵入岩地球化学特征及地质意义[J].矿产勘查,2018,9(8):1483-1489
青海扎尔玛格地区晚奥陶世侵入岩地球化学特征及地质意义
Geochemistry and geological significance of Late Ordovician intrusive rocks in Tuoermage area, Qinghai
投稿时间:2018-02-01  
DOI:
中文关键词: 地球化学  构造环境  锆石U-Pb年龄  扎尔玛格  南祁连
英文关键词: geochemistry,tectonic setting, zircon U-Pb age, Zhaermage, Southern Qilian
基金项目:中国地质调查局项目(编号:1212010818044)资助。
作者单位
魏小林 吉林大学地球科学学院,长春 130026
青海省地质调查局,西宁 810001 
甘承萍 青海省第三地质矿产勘查院,西宁 810029 
于小亮 青海省地质调查局,西宁 810001 
保善斌 青海省地质调查局,西宁 810001 
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中文摘要:
      扎尔玛格地区位于南祁连西段,该区中酸性侵入岩主要岩性为二长花岗岩和似斑状二长花岗岩,综合其岩石学、岩石地球化学、同位素测年等资料,岩石属铝过饱和高钾钙碱性系列;轻稀土元素相对富集,δEu=0.53~0.77,平均为0.69,显示铕强亏损;似斑状二长花岗岩LA-MC-ICPMS锆石U-Pb同位素年龄为(453.7±1.8)Ma,表明侵入体的形成时代为晚奥陶世。岩石地球化学特征表明,扎尔玛格地区的晚奥陶世中酸性侵入岩是祁连山造山带由俯冲向碰撞转换的构造环境下产生的,该套侵入岩的发现对南祁连西段疏勒南山地区的构造岩浆带研究及发展演化史研究具有重要意义。
英文摘要:
      The Zhaermage area is located in western section of South Qilian. The intermediate-acid intrusive rocks in this area are mainly monzogranite and Porphyritic monzogranite. Through comprehensive analysis of petrology, petrochemistry and isotopic dating information,they are defined as aluminum supersaturated, high potassium and calc-alkali series, enriched with light REE and depletion of Eu(δEu=0.53~0.77,with an average of 0.69). The U-Pb isotopic dating measurement of zircon mineral collected from the porphyritic monzontic granite by LA-MC-ICPMS method is (453.7±1.8) Ma. Comprehensive research shows that Zhaermage pluton is generated in a tectonic environment when the Qilian orogeny changed from subduction to collision, The discovery of intrusive rocks is of great significance for the further study on tectonic magmatic belt and the evolution history in Shulenanshan area South Qilian.
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