刘桂萍,郭瑞清,魏震,孙敏佳,崔涛,吴华楠,宋志豪.新疆库鲁克塔格地区古生代花岗质侵入岩全岩Sr-Nd和锆石Hf同位素地球化学特征及其意义[J].西北地质,2021,54(3):39-50 LIU Guiping,GUO Ruiqing,WEI Zhen,SUN Minjia,CUI Tao,WU Huanan,SONG Zhihao.Geochemical Characteristics and Significance of the Whole Rock Sr-Nd and Zircon Hf Isotopic in the Paleozoic Granite-plutons in Kuruktag, Xinjiang[J].Northwestern Geology,2021,54(3):39-50
新疆库鲁克塔格地区古生代花岗质侵入岩全岩Sr-Nd和锆石Hf同位素地球化学特征及其意义
Geochemical Characteristics and Significance of the Whole Rock Sr-Nd and Zircon Hf Isotopic in the Paleozoic Granite-plutons in Kuruktag, Xinjiang
投稿时间:2020-07-05  修订日期:2021-03-07
DOI:10.19751/j.cnki.61-1149/p.2021.03.004
中文关键词:  库鲁克塔格;Sr-Nd同位素;Hf同位素;南天山洋
英文关键词:Kuruktag;Sr-Nd isotope;Hf isotope;south Tianshan ocean
基金项目:国家自然科学基金(41762015);新疆维吾尔自治区自然科学联合基金项目(2020D01C049)。
作者单位E-mail
刘桂萍 新疆中亚造山带大陆动力学与成矿预测自治区重点实验室, 新疆大学地质与矿业工程学院, 新疆 乌鲁木齐 830046  
郭瑞清 新疆中亚造山带大陆动力学与成矿预测自治区重点实验室, 新疆大学地质与矿业工程学院, 新疆 乌鲁木齐 830046 guoruiqing8888@163.com 
魏震 新疆中亚造山带大陆动力学与成矿预测自治区重点实验室, 新疆大学地质与矿业工程学院, 新疆 乌鲁木齐 830046  
孙敏佳 新疆中亚造山带大陆动力学与成矿预测自治区重点实验室, 新疆大学地质与矿业工程学院, 新疆 乌鲁木齐 830046  
崔涛 新疆中亚造山带大陆动力学与成矿预测自治区重点实验室, 新疆大学地质与矿业工程学院, 新疆 乌鲁木齐 830046  
吴华楠 新疆中亚造山带大陆动力学与成矿预测自治区重点实验室, 新疆大学地质与矿业工程学院, 新疆 乌鲁木齐 830046  
宋志豪 新疆中亚造山带大陆动力学与成矿预测自治区重点实验室, 新疆大学地质与矿业工程学院, 新疆 乌鲁木齐 830046  
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中文摘要:
      白海子南岩体是库鲁克塔格地区典型的古生代花岗质侵入岩。深入了解该岩体岩石成因及物质来源,对研究库鲁克塔格地区构造背景及古生代地壳演化过程具有重要意义。笔者对白海子南岩体进行了系统的全岩Sr-Nd和锆石Hf同位素及锆石微量元素研究。结果表明,该岩体具有中等ISr(0.710 01~0.712 87)比值,富集的εNdt)值(-21.01~-18.07)和εHft)值(-26.55~-17.28),对应的Nd二阶段模式年龄(TDM2)和Hf模式年龄(TDMC)分别为2.60~2.84 Ga和2.43~3.00 Ga,表明其是古元古代早期—新太古代地壳物质再循环的产物。锆石微量元素分析表明,该岩体锆石为壳源岩浆锆石,TZr均值为745℃,TTi均值为692℃,属于“冷”岩浆,岩体形成于主动大陆边缘,是南天山洋向南俯冲到塔里木克拉通之下后期阶段的产物,俯冲过程中幔源岩浆底侵产生的余热为该岩体熔融提供热源。在库鲁克塔格地区发现多期次古生代花岗质侵入岩,这些岩体的εNdt)值和锆石εHft)值随年龄的减小呈现先上升后下降的趋势,结合前人已有资料,推测在南天山洋向塔里木克拉通俯冲过程中,库鲁克塔格地区奥陶纪—早石炭世地壳演化经历了先减薄再加厚的演化过程。
英文摘要:
      The Baihaizi pluton is typical Paleozoic granitic intrusive rock in Kuruktag area.A deep understanding of the petrogenesis and the source material of the rock is of great significance to the study of the tectonic setting and Paleozoic crustal evolution in this area. This paper studied the whole rock Sr-Nd, zircon Hf isotope and zircon trace elements of the Baihaizi pluton.The isotopic results indicate that the rocks have the intitial medium value of ISr (0.710 01~0.712 87), with the negative εNd(t) (-21.01~-18.07) and negative εHf(t) (-26.55~-17.28) values. The corresponding Nd two stage mode age (TDM2) and Hf mode age (TDMC) range from 2.60 Ga to 2.84 Ga and from 2.43 Ga to 3.00 Ga, respectively, indicating that it is the product of the recycling of crustal materials from the early Paleoproterozoic to the Neoarchean.The zircon trace element analysis shows that the zircons are magmatic crust zircons, with an average TZr=745℃ and TTi=692℃.The "cold" magma formed in the active continental margin and it was the product of the southward subduction of the south Tianshan ocean to the lower part of the Tarim Craton in the late stage. Many Paleozoic granitic intrusive rocks have been found in the Kuruktag area, the εNd(t) value and zircon εHf(t) value increase first and then decrease with a reduction of age.Combined with the previous data, it is held that crustal evolution in the Kuruktag area experienced a thin-to-thick process in the subduction of the south Tianshan ocean to the Tarim block during the Ordovician-Early Carboniferous.
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