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首页> 外文期刊>Journal of Asian earth sciences >Early Carboniferous metamorphism of the Neoproterozoic South Tien Shan- Karakum basement: New geochronological results from Baisun and Kyzylkum, Uzbekistan
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Early Carboniferous metamorphism of the Neoproterozoic South Tien Shan- Karakum basement: New geochronological results from Baisun and Kyzylkum, Uzbekistan

机译：乌兹别克斯坦百森和Kyzylkum的新地理学结果

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摘要

Paleozoic evolution of the western Tien Shan, which is built up on the basement of the Karakum continent, is poorly constrained compared to the better investigated Tien Shan terranes along the margin of the Tarim Craton. We present magmatic, metamorphic and detrital zircon ages for the regionally metamorphosed Baisun block and the metasediments comprising the Karakum basement in the westernmost parts of the South Tien Shan terrane. Age spectra of detrital zircon from metasediments of the Baisun metamorphic block and the western South Tien Shan show remarkable similarities over the vast area extending for ca. 500 km and are characterized by major Neoproterozoic peak at 1200-600 Ma and smaller peaks at 2300-1700 and 2700-2400 Ma. The 570-540 Ma ages of the youngest grains define late Neoproterozoic (Ediacaran) - early Cambrian maximum depositional ages of the metasediments. Comparison of the obtained age spectra with those published for the adjacent Tien Shan terranes indicate that the detrital zircon grains in the studied Ediacaran sediments were derived from the southern Precambrian continents of Karakum and Tarim while transport from the Northern Tien Shan was limited. The age of the Barrovian metamorphism in the Baisun block is constrained by ages of anatectic granites in the range 352-340 Ma, corresponding to early Carboniferous. These ages well match the 340-330 Ma ages, established for the adjacent Lolabulak and Garm metamorphic blocks. Based on the regional distribution of suture zones we suggest that during the Carboniferous the relatively small tectonic blocks of the South Gissar comprised an archipelago, located between the larger continents of Karakum and Tarim and possibly connected with the Paleotethys Ocean. The archipelago scenario can explain hot and rapid metamorphic and tectonic processes, documented in the South Gissar, similar to the ongoing collision along the Australia - SE Asia junction.
机译：与Tarim Craton的边缘更好地调查的天山地区相比，建立在卡拉库姆大陆的地下室的古生代的古生代演变。我们为地区变质的Baisun嵌段呈现岩浆，变质和碎屑锆石，以及南部山地区最西部地区的卡拉库姆地下室的替代品。来自Baisun变质块的Metediment的DEDRITITITILCON的年龄谱和西南山区的南部山区的广大面积呈现出色的相似之处。 500公里，并以2300-1700和2700-2400 mA的2300-1700和2700-2400 mA的主要内科罗古代峰。 570-540 mA繁多的最小颗粒定义晚期新蛋白（EdiaCaran） - 早期寒武纪最大沉积的弥补年龄。所获得的年龄谱与邻近天山地区发表的年龄谱的比较表明，研究的埃迪基菌沉积物中的滴乳锆石谷物来自于南山北部的南普拉明州大陆的南普拉明州大陆，而山山北部的运输有限。 BAISUN块中的Barrovian变质的年龄受到352-340mA的衰老的约束，对应于早期石炭系。这些年龄符合较好的340-330岁，为邻近的LOLABULAK和GARM变形块成立。基于缝线区的区域分布，我们建议在石炭纪中，南吉拉的相对较小的构造块包括一个群岛，位于克拉库姆和塔里木的较大大陆之间，并且可能与古麦多斯海洋相连。群岛方案可以解释在南格拉尔的炎热和快速的变质过程和构造过程，类似于澳大利亚亚洲交界处的持续碰撞。

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  • 来源
    《Journal of Asian earth sciences》 |2019年第15期|275-286|共12页
  • 作者

    Konopelko D.; Biske Yu. S.; Kullerud K.; Ganiev I.; Seltmann R.; Brownscombe W.; Mirkamalov R.; Wang B.; Safonova I.; Kotler P.; Shatov V.; Sun M.; Wong J.;

  • 作者单位

    St Petersburg State Univ 7-9 Univ Embankment St Petersburg 199034 Russia|Novosibirsk State Univ 1 Pirogova St Novosibirsk 630090 Russia;

    St Petersburg State Univ 7-9 Univ Embankment St Petersburg 199034 Russia;

    Norwegian Min Museum POB 18 N-3602 Kongsberg Norway;

    Natl Univ Uzbekistan Dept Geol Tashkent Uzbekistan;

    Ctr Russian & Cent EurAsian Mineral Studies CERCA Nat Hist Museum London SW7 5BD England;

    Ctr Russian & Cent EurAsian Mineral Studies CERCA Nat Hist Museum London SW7 5BD England;

    Inst Mineral Resources Tashkent Uzbekistan;

    Nanjing Univ State Key Lab Mineral Deposits Res Dept Earth Sci Nanjing 210093 Jiangsu Peoples R China;

    Novosibirsk State Univ 1 Pirogova St Novosibirsk 630090 Russia|RAS SB Inst Geol & Mineral Koptyuga Ave 3 Novosibirsk 630090 Russia;

    Novosibirsk State Univ 1 Pirogova St Novosibirsk 630090 Russia|RAS SB Inst Geol & Mineral Koptyuga Ave 3 Novosibirsk 630090 Russia;

    All Russian Geol Res Inst VSEGEI St Petersburg 199106 Russia;

    Univ Hong Kong Dept Earth Sci Pokfulam Rd Hong Kong Peoples R China;

    Univ Hong Kong Dept Earth Sci Pokfulam Rd Hong Kong Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Uzbekistan; South Tien Shan (Tianshan); Baisun Block; Zircon ages; Neoproterozoic basement; Carboniferous metamorphism;

    机译：乌兹别克斯坦;南天山（天山）;Baisun块;锆石年龄;Neoproterozoic地下室;石炭纪的变质;

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