新疆温泉县卓勒萨依一带乌郎组火山岩锆石U-Pb年龄、地球化学特征及其构造意义
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  • 英文篇名:Zircon U-Pb Ages,Geochemistry and Tectonic Significance of Volcanic Rock of Wulang Formation in Zhuolesayi Area,Wenquan,Xinjiang
  • 作者:孟令华 ; 张树淇 ; 吴树明 ; 张磊 ; 周龙涛 ; 杜小亮 ; 王浩
  • 英文作者:MENG Ling-hua;ZHANG Shu-qi;WU Shu-ming;ZHANG Lei;ZHOU Long-tao;DU Xiao-liang;WANG Hao;Shandong Geological Prospecting Institute of Chemical Geology and Mine Bureau;
  • 关键词:锆石U-Pb年龄 ; 地球化学 ; 构造环境 ; 火山岩 ; 乌郎组 ; 温泉县
  • 英文关键词:zircon U-Pb age;;geochemistry;;tectonic setting;;volcanic rocks;;Wulang Formation;;Wenquan Country
  • 中文刊名:KXJS
  • 英文刊名:Science Technology and Engineering
  • 机构:中化地质矿山总局山东地质勘查院;
  • 出版日期:2019-02-18
  • 出版单位:科学技术与工程
  • 年:2019
  • 期:v.19;No.474
  • 基金:新疆维吾尔自治区地质勘查基金(T15-1-LQ17)资助
  • 语种:中文;
  • 页:KXJS201905006
  • 页数:12
  • CN:05
  • ISSN:11-4688/T
  • 分类号:40-51
摘要
卓勒萨依一带的乌郎组火山岩位于温泉县城东南25 km处,岩石类型主要为安山岩和流纹岩,火山岩浆具有由酸性-中性-酸性演化的特点,以裂隙式喷发类型为主。LA-ICP-MS锆石U-Pb年龄为(293±3) Ma,时代为早二叠世。该火山岩里特曼指数为1. 71~2. 60;碱度率为2. 13~2. 85,K_2O/Na_2O比为0. 31~1. 83,属钙碱性系列。Nb/Ta为18. 65~22. 85,略高于原始地幔值,Zr/Hf为28. 54~41. 08,与原始地幔值相近。(Rb/Yb)_N为9. 82~20. 04,大于1,属于强不相容元素富集分配形式。稀土总量为(118. 41~194. 70)×10~(-6);(Ce/Yb)_N为2. 55~3. 70,(La/Yb)_N为2. 98~4. 17,均大于1,属于轻稀土富集型,且轻稀土分馏明显;δEu为0. 19~0. 59,远小于1,显示为负铕异常,铕亏损明显。根据相关构造环境判别图解,结合火山岩的地球化学特征及其所处的区域地质背景,认为卓勒萨依一带强烈的火山活动所反映的构造环境为陆缘岛弧型造山带环境。
        The volcanic rocks of Wulang formation in Zhuolesayi area are located at 25 km southeast of Wenquan county,the main rock types are andesite and rhyolite. Volcanic magma is characterized by acid to intermediate to acid magma evolution,and the main type is fissure eruption. The LA-ICP-MS zircon U-Pb age is( 293 ±3) Ma,it was formed in early Permian. The Rittermann index of the volcanic rock is 1. 71 to 2. 60,the alkalinity rate is 2. 13 to 2. 85,and the ratio of K_2O/Na_2O is 0. 31 to 1. 83,which was belonged to the calc-alkaline series.The Nb/Ta is 18. 65 to 22. 85,slightly higher than the original mantle value,and the Zr/Hf is 28. 54 to 41. 08,which was similar to the original mantle. The( Rb/Yb)_N value is 9. 82 to 20. 04,more than 1,which was belonged to the enrichment and distribution form of strong incompatible elements. The total rare-earth elements is( 118. 41 ~194. 70) × 10~(-6);( Ce/Yb)_N value is 2. 55 to 3. 70,( La/Yb)_N value is 2. 98 to 4. 17,were more than 1,belonged to the LREE enrichment,and LREE fractionation is obvious; δEu value is 0. 19 to 0. 59,far less than 1,showed a negative Eu anomaly,Eu loss significantly. According to the relevant tectonicdiscrimination diagrams,combined with regional geological background and geochemical characteristics of volcano rock,it is considered that the tectonic environment reflected by the intense volcanic activities in Zhuolesayi area is the continental margin island-arc-type orogenic belt environment.
引文
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