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首页> 外文期刊>Journal of Asian earth sciences >Age and provenance of the Chaung Magyi Group, Yeywa Dome, Myanmar,based on U-Pb dating of detrital zircons
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Age and provenance of the Chaung Magyi Group, Yeywa Dome, Myanmar,based on U-Pb dating of detrital zircons

机译：基于碎屑锆石的U-Pb测年，缅甸Yeywa Dome的Chaung Magyi集团的年龄和出处

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The unfossiliferous Chaung Magyi Group of the Northern Shan Plateau of Myanmar, comprises metasedimentary rocks, in particular greywacke, slates, phyllites and schists, of inferred Proterozoic age that unconformably underlie the late Cambrian Pangyun Formation. To address the problem of the youngest stratigraphic extent of the group, four samples of the Chaung Magyi Group from the Yeywa Dome, East of Kyaukse, Mandalay Division, were collected for U-Pb dating of detrital zircons. Based on the youngest detrital zircons present in sandstone samples from the western Yeywa Dome area, at least the upper part of the Chaung Magyi Group is of latest Proterozoic age and possibly extends to the late Cambrian (similar to 500 Ma). Comparison of detrital zircon age-frequency histogram distributions show only slight differences in distributions of detrital zircons in the Cambrian of NW Thailand and the Chaung Magyi Group samples (Sibumasu Terrane), with a concentration of ages between 1300 Ma and 820 Ma, with two major peaks at 1086 Ma and 1022 Ma. A younger Cryogenian age peak at 647 Ma is also observed. A spread of older concordant ages ranges from 3093 Ma to 1406 Ma. The minimum depositional age for the Chaung Magyi Group of the west of the Bawdwin Mine (982 Ma) based on ages of cross-cutting dykes (reported in Mitchell, 2018), and the maximum depositional age for Yeywa Dome (similar to 600-500 Ma) based on detrital zircons suggest the age difference (similar to > 400 my) is too great for the Chaung Magyi Group to be considered a single group, the dyke ages require re-investigation.
机译：缅甸北部高原的无化石的Chaung Magyi群包括推测为元古生代的变质沉积岩，尤其是灰泥,、板岩，层状岩和片岩，不整合地形成于晚寒武纪庞云组之下。为了解决该组最年轻的地层问题，曼德勒分部，Kyaukse以东的Yeywa Dome的Chaung Magyi组的四个样本被收集用于碎屑锆石的U-Pb定年。根据Yeywa Dome西部地区砂岩样品中存在的最年轻的碎屑锆石，至少Chaung Magyi组的上部是元古生代，并可能延伸到寒武纪晚期（类似于500 Ma）。碎屑锆石年龄-频率直方图分布的比较显示，在泰国西北寒武纪和Chaung Magyi组样本（Sibumasu Terrane）中，碎屑锆石的分布仅略有差异，其年龄集中在1300 Ma和820 Ma之间，主要有两个峰值在1086 Ma和1022 Ma。还观察到了更年轻的低温致冷峰，位于647 Ma。较早的一致年龄分布在3093 Ma至1406 Ma之间。鲍德温矿以西的Chaung Magyi组的最小沉积年龄（982 Ma），基于横穿堤坝的年龄（Mitchell报告，2018年）以及Yeywa Dome的最大沉积年龄（约600-500） Ma）基于碎屑锆石表明年龄差异（> 400 my）太大，Chaung Magyi Group不能被视为一个单独的群体，堤的年龄需要重新调查。

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