| 川西雀儿山花岗杂岩体锆石U-Pb年龄、地球化学特征及其成矿专属性 |
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| 引用本文： | 刘海永,旺姆,严维兵,曾强,赵磊,廖炳勇,杨剑红,张芝虎,张铁硬,罗巍.川西雀儿山花岗杂岩体锆石U-Pb年龄、地球化学特征及其成矿专属性[J].世界地质,2016,35(4):968-981. |
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| 作者姓名： | 刘海永 旺姆 严维兵 曾强 赵磊 廖炳勇 杨剑红 张芝虎 张铁硬 罗巍 |
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| 作者单位： | 1. 成都理工大学 地球科学学院，成都 610059; 2. 四川省地矿局区调队，成都 610213; 3. 西藏自治区地质调查院，拉萨 850000; 4. 江苏省地质勘查技术院，南京 210049; 5. 中陕核工业集团公司，西安 710100 |
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| 摘 要： | 川西义敦岛弧碰撞造山带北段雀儿山复式花岗杂岩体的年代学和全岩地球化学研究表明,雀儿山杂岩体主要由花岗闪长岩、二长花岗岩和正长花岗岩组成。锆石LA--ICP--MS U--Pb测年结果显示,该岩体中的花岗闪长岩形成时代为晚三叠世(224±3 Ma),二长花岗岩则形成于早白垩世(102±1 Ma)。地球化学数据表明,晚三叠世花岗闪长岩为火山弧岩石序列,形成环境为碰撞前俯冲环境;早白垩世二长花岗岩和正长花岗岩为后碰撞岩石序列,形成于造山期后板内或陆内环境。结合区域地质资料,认为雀儿山杂岩体为印支期—燕山期义敦岛弧碰撞造山带经历俯冲--碰撞--隆升过程中的产物。
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| 关 键 词： | 雀儿山花岗杂岩体 锆石 U--Pb 年龄 地球化学 岩石成因 构造背景 川西 |
Zircon U--Pb ages and geochemistry of Queershan granitic complex in western Sichuan and metallogenic specialization |
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| LIU Hai-Yong,WANG Mu,YAN Wei-Bing,ZENG Qiang,ZHAO Lei,LIAO Bing-Yong,YANG Jian-Hong,ZHANG Zhi-Hu,ZHANG Tie-Ying,LUO Wei.Zircon U--Pb ages and geochemistry of Queershan granitic complex in western Sichuan and metallogenic specialization[J].World Geology,2016,35(4):968-981. |
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| Authors: | LIU Hai-Yong WANG Mu YAN Wei-Bing ZENG Qiang ZHAO Lei LIAO Bing-Yong YANG Jian-Hong ZHANG Zhi-Hu ZHANG Tie-Ying LUO Wei |
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| Institution: | 1. College of Earth Sciences，Chengdu University of Technology，Chengdu 610059，China; 2. Sichuan Geology and Mineral Bureau Ｒegional Geological Survey，Chengdu 610213，China; 3. The Tibet Autonomous Ｒegion Institute of Geological Survey，Lhasa 850000，China; 4. Geological Exploration Technology Institute of Jiangsu Province，Nanjing 210049，China; 5. Sino Shaanxi Nuclear Industry Group Company，Xi'an 710100，China |
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| Abstract: | The study of geochronology and whole-rock geochemistry in Que'ershan granitic complex from the northern Yidun arc collision-orogenic belt，western Sichuan shows that Que'ershan complex consists mainly of gran- odiorite，monzogranite and syenogranite． The results of zircon LA--ICP--MS U--Pb data indicate that the granodiorite of this granitic complex formed in the Late Triassic (224 ±3 Ma)，and the monzogranite was emplaced in the Early Cretaceous (102 ±1 Ma)． The geochemical data suggest that the Late Triassic granodiorites belong to the volcanic arc granite series，and might form in a pre-collision subduction setting，whereas the Early Cretaceous monzogranites and syenogranites belong to post-collisional rock serious，and probably formed within plate or continent during the post-orogeny stage． In combination with regional geological data，the authors propose that the Que'ershan granitic complex were results of subduction-collision-uplift of Yidun arc collision-orogenic belt during Indosinian--Yans- hanian period． |
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| Keywords: | Queershan granitic complex zircon U--Pb ages geochemistry petrogenesis tectonic setting western Sichuan |
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