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地质力学学报:2018,24(5):661-669
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新疆库地南苏盖提力克晚志留世花岗岩锆石U-Pb年龄、地球化学特征及大地构造意义
专少鹏, 白春东, 毛志芳, 李典, 张新征, 陈圆圆, 连青
(河北省区域地质调查院, 河北 廊坊 065000)
ZIRCON U-Pb AGES AND GEOCHEMICAL CHARACTERISTICS OF THE SUGAITILIKE LATE SILURIAN GRANITES IN SOUTHERN KUDI, XINJIANG AND ITS GEOTECTONIC SIGNIFICANCE
ZHUAN Shaopeng, BAI Chundong, MAO Zhifang, LI Dian, ZHANG Xinzheng, CHEN Yuanyuan, LIAN Qing
(Hebei Institute of Regional Geological Survey, Langfang 065000, Hebei, China)
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投稿时间:2018-04-12    修订日期:2018-07-30
中文摘要: 西昆仑地区早古生代原特提斯洋的后碰撞阶段划分存在分歧,通过对库地蛇绿岩南侧苏盖提力克花岗岩开展区域地质调查、岩石学、地球化学、锆石U-Pb年代学等方面研究,从而为原特提斯洋构造演化及闭合时限提供地质依据。研究表明,苏盖提力克花岗岩锆石U-Pb年龄(LA-ICP-MS)为(422.5±2.5) Ma,属于晚志留世岩浆活动产物。苏盖提力克花岗岩含有典型矿物白云母,A/CNK=1.07~1.11,刚玉分子含量为1.07%~1.56%,属于S型花岗岩。地球化学上,该岩体富硅、碱,贫钙、镁,富K、Rb、Nb、Th,贫Sr、Ti、P,Rb/Sr比值高;结合区域地质背景及地球化学特征综合分析表明,苏盖提力克花岗岩是原特提斯洋闭合后碰撞阶段的产物,因而晚志留世是原特提斯洋由消减闭合到陆陆碰撞—碰撞后伸展转换时期。
Abstract:There are different opinions about the division of post-collisional stages of the Early Paleozoic Proto-Tethys Ocean in the West Kunlun area. In this paper, researches including regional geological survey, petrology, geochemistry, zircon U-Pb chronology, etc. were carried out on Sugaitilike granites, south side of Kudi ophiolite, which provide a geological basis for the tectonic evolution and closing time limit of the Proto-Tethys Ocean. The results show that, the age of zircon U-Pb(LA-ICP-MS) is 422.5±2.5 Ma, making granites products of the late Silurian magma activities. Sugaitilike granite contains typical mineral muscovite, A/CNK=1.07~1.11, and the content of corundum is 1.07~1.56%, belonging to S-type granite. Geochemically, the rock body is rich in silicon, alkali, calcium-depleted, magnesium-rich, rich in K, Rb, Nb, Th, lean in Sr, Ti, P, and high in Rb/Sr ratio. The comprehensive analysis of the geological background and geochemical characteristics of the Sugeitik granite area shows that granites are the products of the collision phase of the Proto-Tethys Ocean. Therefore, the late Silurian is the transition period from the closing of the Proto-Tethys Ocean to the collision of land and land-the period of post-collisional extension transformation.
文章编号:     中图分类号:P588.12    文献标志码:
基金项目:新疆维吾尔自治区地质勘查基金项目(XJDKJJZ2011-4)
引用文本:
专少鹏,白春东,毛志芳,李典,张新征,陈圆圆,连青.新疆库地南苏盖提力克晚志留世花岗岩锆石U-Pb年龄、地球化学特征及大地构造意义[J].地质力学学报,2018,24(5):661-669DOI:10.12090/j.issn.1006-6616.2018.24.05.066
ZHUAN Shaopeng,BAI Chundong,MAO Zhifang,LI Dian,ZHANG Xinzheng,CHEN Yuanyuan,LIAN Qing.ZIRCON U-Pb AGES AND GEOCHEMICAL CHARACTERISTICS OF THE SUGAITILIKE LATE SILURIAN GRANITES IN SOUTHERN KUDI, XINJIANG AND ITS GEOTECTONIC SIGNIFICANCE[J].,2018,24(5):661-669DOI:10.12090/j.issn.1006-6616.2018.24.05.066

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