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祁漫塔格陆相火山岩：塔里木陆块南缘印支期活动大陆边缘的岩石学证据

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刘红涛. 祁漫塔格陆相火山岩：塔里木陆块南缘印支期活动大陆边缘的岩石学证据[J]. 岩石学报, 2001, 17(3): 337-351.
引用本文: 刘红涛. 祁漫塔格陆相火山岩：塔里木陆块南缘印支期活动大陆边缘的岩石学证据[J]. 岩石学报, 2001, 17(3): 337-351.
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Liu HT. Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China. Qimantage terrestrial volcanics: petrologic evidence of active continental margirof Tarim Plate during late Indo-China epoch[J]. Acta Petrologica Sinica, 2001, 17(3): 337-351.
Citation: Liu HT. Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China. Qimantage terrestrial volcanics: petrologic evidence of active continental margirof Tarim Plate during late Indo-China epoch[J]. Acta Petrologica Sinica, 2001, 17(3): 337-351.
shu

祁漫塔格陆相火山岩：塔里木陆块南缘印支期活动大陆边缘的岩石学证据

    • 刘红涛（中国科学院地质与地球物理研究所,北京,100029）

  • 基金项目:

    中国科学院资源环境领域知识创新工程重大项目(KZCX1-07)资助.

Qimantage terrestrial volcanics: petrologic evidence of active continental margirof Tarim Plate during late Indo-China epoch

    摘要
  • 在东昆仑北部的祁漫塔格山地区发育一套晚三叠世陆相火山岩，这套火山岩主要由英安－流纹质熔岩和火山碎屑岩构成，并含有少量的玄武安山岩和安山岩夹层，岩石组合类似于消减带之上的玄武岩－安山岩－英安岩－流纹岩组合，其岩相特征与安第斯火山岩带发育的“灰流凝灰岩”组合基本一致，岩石地球化学研究表明，它属于典型的钙碱系列岩石（CA＝59），并具有富钾特点；以富集大离子亲石元素，亏损高场强元素为重要特征，具有稀土总量较高（REE＝151．26－288．43ug/g)，轻稀土富集（LaCN/YbCN=8.42-21.77)和轻微－中等程度的负铕异常（Eu=0.25-0.82）的球粒陨石标准化稀土元素配分图谱，根据上述岩石地球化学特征并结合其发育的区域地质条件，认为这套火山岩类似于中安第斯的弧火山岩，其形成的大地构造环境应活动大陆边缘，采集于火山岩东，西两个剖面中的两组同位素测年样品，获得的全岩Rb-Sr等时线年龄分别为208Ma和222Ma，指示火山岩的喷发时代相当于晚三叠世晚期（印支晚期）。根据同位素测年样品的地理分布，推断该期火山活动在西部喷发较早，东部则相对较晚。由于这套火山岩发育在昆仑造山带北侧与塔里木陆块的接合部位的祁浸塔格山地区，因而推断在印支晚期昆仑洋壳曾经向塔里木陆声发生过强烈的B消减事件，导致在塔里木陆块南缘发育大规模弧岩浆活动；本研究认为，这套陆相火山岩与本区的同时代（或稍晚）花岗岩类共同构成了塔里木陆块南缘的印支期弧岩浆带。
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修回日期:  2001-03-19
刊出日期:  2001-08-31

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