青藏高原北羌塘他念他翁山吉塘岩群酉西岩组时代的确定
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The age of Youxi formation of Jitang rock Group in Taniantaweng mountains, northern Qiangtang, Qinghai-Tibet Plateau
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    摘要:

    位于青藏高原北羌塘地区的吉塘岩群是否属于前寒武纪变质岩系历来存在较大争议,对其形成年龄一直缺少有效同位素年代学限定。通过高精度的LA-ICP-MS(激光剥蚀等离子体质谱仪)锆石微区原位U-Pb同位素测年,获得他念他翁山一带吉塘岩群酉西岩组石英绿泥片岩(原岩为中性火山岩)形成年龄为(965±55)Ma,绿片岩(原岩为中基性火山岩)的形成年龄为(1048.2±3.3)Ma,表明吉塘岩群酉西岩组形成时代为蓟县纪末—南华纪初。吉塘岩群酉西岩组可能代表Rodinia超大陆裂解早期伸展期间火山-沉积作用的地质记录。

    Abstract:

    Whether the Jitang rock Goup belong to Precambrian metamorphite series have long been controversial in northern Qingtang, Qinghai-Tibet Plateau, especially being lack of effective isotopic age to restrict its age. High resolution LA-ICP-MS in situ dating yields the age of 965±55Ma and 1048.2±3.3 Ma from quartz-chlorite schist(the protolith is intermediate volcanic rocks) and greenschist(the protolith is intermediate-basic volcanic rocks) in Jitang rock Group, Taniantaweng mountains, which indicate the formation age of Youxi formation of the Jitang rock Group was latest Jixian-earliest Nanhua。Meanwhile, the Youxi formation of the Jitang rock Group may represent the geological record of vocanic-sedimentary during the extension of early Rodinia supercontinent break.

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何世平,李荣社,于浦生,辜平阳,王超,杨永成,张维吉.2012.青藏高原北羌塘他念他翁山吉塘岩群酉西岩组时代的确定[J].地质学报,86(6):985-993.
He Shiping.2012. The age of Youxi formation of Jitang rock Group in Taniantaweng mountains, northern Qiangtang, Qinghai-Tibet Plateau[J]. Acta Geologica Sinica,86(6):985-993.

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  • 收稿日期:2010-03-03
  • 最后修改日期:2010-03-03
  • 录用日期:2010-05-03
  • 在线发布日期: 2012-05-31