Neoproterozoic-Jurassic Tectonic-Magmatic Events of the Metamorphic Basement in the Nyainrong Microcontinent of Tibet: Implications from Zircon LA-ICP-MS Geochronology
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摘要:
本文选择聂荣微陆块变质基底中正片麻岩进行了详细的年代学研究，通过LA-ICP-MS 锆石U-Pb测年获得的年龄结果分别为502.8±1.2 Ma、532.7±3.4 Ma、833.2±2.8 Ma、734.8±3.3 Ma、495.3±1.7 Ma、496.6±2.0 Ma、495.1±1.2 Ma、803.8±2.8 Ma、811.7±2.8 Ma。综合上述片麻岩锆石U-Pb测年数据结果发现，聂荣微陆块变质基底中正片麻岩的锆石U-Pb年龄大致可以分为三组：830~730 Ma、580~470 Ma、185~160 Ma，说明聂荣微陆块变质基底从新元古代—侏罗纪经历了三期构造–岩浆事件，这三期构造事件分别发生于新元古代早期、新元古代晚期—早古生代、早—中侏罗世。综合前人研究结果，认为聂荣微陆块存在新元古代的基底，并经历了罗迪尼亚超大陆的裂解，于新元古代晚期—早古生代时期发生了泛非—早古生代构造事件，到了侏罗纪，受班公湖–怒江洋壳俯冲和大洋关闭的影响，变质基底发生了早—中侏罗世的岩浆作用和变质作用。
Abstract:In order to further research the Nyainrong microcontinent and the regional geological conditions of the Tibet Plateau, this paper systematically studied the geochronology of orthogneisses from the Nyainrong microcontinent in Tibet. We obtained the zircon U-Pb ages of nine samples by LA-ICP-MS, which were 502.8±1.2 Ma, 532.7±3.4 Ma, 833.2±2.8 Ma, 734.8±3.3 Ma, 495.3±1.7 Ma, 496.6±2.0 Ma, 495.1±1.2 Ma, 803.8±2.8 Ma, 811.7±2.8 Ma. To analyze these age results, we could divide these ages into three groups: 830-730 Ma, 580-470 Ma, 185-160 Ma. It concludes that the metamorphic basement of Nyainrong microcontinent underwent three tectonic-magmatic events which occurred in the early Neoproterozoic, the late Neoproterozoic to the early Paleozoic, and the early-middle Jurassic. Combined with previous studies, it suggests that the Nyainrong microcontinent has Neoproterozoic basement and occurred the breakup of the Rodinia Supercontinent. The metamorphic basement underwent Pan-African and early Paleozoic tectonic events. Then it underwent early-middle Jurassic magmatic-metamorphic events which were related to the Bangong-Nujiang suture zone subduction and closure.
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Key words:
- Nyainrong microcontinent /
- orthogneisses /
- zircon U-Pb age /
- Neoproterozoic-Jurassic /
- Tibet Plateau
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图 6 古特提斯大洋边缘印度—澳大利亚古地理位置重建图（根据Cawood et al., 2007; Zhu et al., 2012修改）
Figure 6.
表 1 年龄样品属性一览表
Table 1. The list of age samples from the basement of Nyainrong block
样品号 经纬度坐标 岩石名称 B19 91°33′44.3″E，32°05′01.7″N 花岗质片麻岩 B31 91°42′26.3″E，32°07′18.7″N 花岗质片麻岩 B42 91°43′12.1″E，32°08′41.0″N 黑云斜长片麻岩 B61-1 91°50′17.2″E，31°49′56.5″N 花岗质片麻岩 B62 91°51′08.9″E，31°49′28.6″N 花岗质片麻岩 B72 91°41′59.0″E，31°53′04.5″N 黑云斜长片麻岩 B80-1 92°03′58.5″E，31°47′41.0″N 花岗质片麻岩 B162 91°41′48.8″E，32°06′05.0″N 花岗质片麻岩 B163 91°42′40.4″E，32°07′25.3″N 英云闪长质片麻岩 
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