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蒙古科布多省阿拉腾索音博地区辉长岩LA-ICP-MS锆石U-Pb年龄及其地质意义

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付超, 李俊建, 唐文龙, 党智财, Orolmaa Demberel. 蒙古科布多省阿拉腾索音博地区辉长岩LA-ICP-MS锆石U-Pb年龄及其地质意义[J]. 地质通报, 2016, 35(4): 572-577.
引用本文: 付超, 李俊建, 唐文龙, 党智财, Orolmaa Demberel. 蒙古科布多省阿拉腾索音博地区辉长岩LA-ICP-MS锆石U-Pb年龄及其地质意义[J]. 地质通报, 2016, 35(4): 572-577.
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FU Chao, LI Junjian, TANG Wenlong, DANG Zhicai, OROLMAA Demberel. LA-ICP-MS zircon U-Pb dating of gabbro in Alatengsuoyinbo, Khovd, Mongolia, and its geological implications[J]. Geological Bulletin of China, 2016, 35(4): 572-577.
Citation: FU Chao, LI Junjian, TANG Wenlong, DANG Zhicai, OROLMAA Demberel. LA-ICP-MS zircon U-Pb dating of gabbro in Alatengsuoyinbo, Khovd, Mongolia, and its geological implications[J]. Geological Bulletin of China, 2016, 35(4): 572-577.
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蒙古科布多省阿拉腾索音博地区辉长岩LA-ICP-MS锆石U-Pb年龄及其地质意义

  • 1. 中国地质调查局天津地质调查中心, 天津 300170;
    2. 蒙古地质科学院, 蒙古 乌兰巴托 211238

LA-ICP-MS zircon U-Pb dating of gabbro in Alatengsuoyinbo, Khovd, Mongolia, and its geological implications

  • 1. Tianjin Center, China Geological Survey, Tianjin 300170, China;
    2. Mongolian Academy of Geological Sciences, Ulaanbaatar 211238, Mongolia

    摘要
  • 蒙古科布多省阿拉腾索音博地区地处阿尔泰构造带南缘,由一系列弧盆系及增生杂岩带组成。区内发育一条近东西向辉长岩带,辉长岩15颗锆石分为2类:一类具明显条带韵律环带,一类内部均匀干净,二者均不具核边结构,不含包体,结合高Th/U值(0.46~0.68),确定为典型的基性岩浆锆石;锆石LA-ICP-MS年龄加权平均值为317.6±1.6Ma,厘定其成岩时代为晚石炭世。研究对比表明,该辉长岩带形成于板块俯冲碰撞的尾声阶段,是阿尔泰造山运动大背景下区域基性岩浆活动的产物。
    Alatengsuoyinbo region in Khovd, Mongolia, is located in the southern Altay tectonic zone which possesses a series of arcbasin and accretionary complexes. There is a nearly EW-trending gabbro belt in this region. This paper reports the zircon age of gab-bro and its tectonic environment.15 grains of gabbro zircon are assigned to two categories:one type of zircons has obvious band rhythm and the other type of zircons is uniform and clean without inclusion. In consideration of the high Th/U ratios (0.46~0.68), it is thought that they are typical basic magmatic zircons. 15 zircons yielded a weighted mean 206Pb/238U age of 317.6±1.6Ma. The gab-bro was formed during Late Carboniferous. The research shows that the gabbro was formed at the end stage of the plate subduction and collision, being the product of mafic magmatic activities under the background of Altay orogeny.
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出版历程
收稿日期:  2015-10-23
修回日期:  2016-03-07
刊出日期:  2016-04-15

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