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首页> 外文期刊>Journal of Asian earth sciences >Devonian post-orogenic extension-related volcano-sedimentary rocks in the northern margin of the Tibetan Plateau, NW China: Implications for the Paleozoic tectonic transition in the North Qaidam Orogen
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Devonian post-orogenic extension-related volcano-sedimentary rocks in the northern margin of the Tibetan Plateau, NW China: Implications for the Paleozoic tectonic transition in the North Qaidam Orogen

机译：中国西北青藏高原北缘泥盆纪与造山运动有关的火山沉积岩：对北柴达木造山带古生代构造过渡的启示

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摘要

The Maoniushan Formation in the northern part of the North Qaidam Orogen (NQO), NW China, contains key information on a Paleozoic change in tectonic setting of the NQO from compression to extension. Here, new zircon U-Pb, petrological, and sedimentological data for the lower molasse sequence of the Maoniushan Formation are used to constrain the timing of this tectonic transition. Detrital zircons yield U-Pb ages of 3.3-0.4 Ga with major populations at 0.53-0.4, 1.0-0.56, 2.5-1.0, and 3.3-2.5 Ga. The maximum depositional age of the Maoniushan Formation is well constrained by a youngest detrital zircon age of similar to 409 Ma. Comparing these dates with geochronological data for the region indicates that Proterozoic-Paleozoic zircons were derived mainly from the NQO as well as the Oulongbuluk and Qaidam blocks, whereas Archean zircons were probably derived from the Oulongbuluk Block and the Tarim Craton. The similar to 924, similar to 463, and similar to 439 Ma tectonothermal events recorded in this region indicate that the NQO was involved in the early Neoproterozoic assembly of Rodinia and early Paleozoic microcontinental convergence. A regional angular unconformity between Devonian and pre-Devonian strata within the NQO suggests a period of strong mountain building between the Oulongbuluk and Qaidam blocks during the Silurian, whereas an Early Devonian post-orogenic molasse, evidence of extensional collapse, and Middle to Late Devonian bimodal volcanic rocks and Carboniferous marine carbonate rocks clearly reflect long-lived tectonic extension. Based on these results and the regional geology, we suggest that the Devonian volcano-sedimentary rocks within the NQO were formed in a post-orogenic extensional setting similar to that of the East Kunlun Orogen, indicating that a major tectonic transition from compression to extension in these two orogens probably commenced in the Early Devonian.
机译：中国西北部柴达木造山带（NQO）北部的毛牛山组包含有关NQO构造环境从压缩到伸展的古生代变化的关键信息。这里，Maoniushan组下部糖蜜序列的新锆石U-Pb，岩石学和沉积学数据被用来限制这种构造转变的时间。碎屑锆石的U-Pb年龄为3.3-0.4 Ga，主要种群为0.53-0.4、1.0-0.56、2.5-1.0和3.3-2.5 Ga。Maoniushan组的最大沉积年龄受到最年轻的碎屑锆石的限制。年龄类似于409 Ma。将这些日期与该地区的年代学数据进行比较，表明元古生锆石主要来自NQO，Oulongbuluk和Qaidam块，而太古宙锆石可能来自Oulongbuluk块和Tarim Craton。该地区记录的与924相似，与463相似，以及与439 Ma相似的构造热事件表明，NQO参与了Rodinia的新元古代的早期组装和古生代的微大陆融合。 NQO内泥盆纪和前泥盆纪地层之间的区域角度不整合表明，志留纪期间在Oulongbuluk和Qaidam块之间有一段坚固的山地建设时期，而泥盆纪早期造山后的蜜糖蜜，伸展塌陷的证据以及中晚期泥盆纪双峰火山岩和石炭纪海相碳酸盐岩清楚地反映了长期的构造伸展。根据这些结果和区域地质，我们认为NQO内的泥盆纪火山沉积岩是在类似于东昆仑造山带的造山后伸展环境中形成的，这表明该地区的一个主要的构造转变是从压缩到伸展。这两个造山带可能始于泥盆纪早期。

著录项

  • 来源
    《Journal of Asian earth sciences》 |2018年第may1期|145-166|共22页
  • 作者

    Qin Yu; Feng Qiao; Chen Gang; Chen Yan; Zou Kaizhen; Liu Qian; Jiao Qianqian; Zhou Dingwu; Pan Lihui; Gao Jindong;

  • 作者单位

    Northweste Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Shaanxi, Peoples R China;

    Shandong Univ Sci & Technol, Shandong Prov Key Lab Deposit Mineralizat & Sedim, Qingdao 266590, Peoples R China;

    Northweste Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Shaanxi, Peoples R China;

    PetroChina, Qinghai Oilfield Branch, Dunhuang 736202, Peoples R China;

    PetroChina, Qinghai Oilfield Branch, Dunhuang 736202, Peoples R China;

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

    Kunming Univ Sci & Technol, Dept Earth Sci, Kunming 650093, Yunnan, Peoples R China;

    Shandong Univ Sci & Technol, Shandong Prov Key Lab Deposit Mineralizat & Sedim, Qingdao 266590, Peoples R China;

    Northweste Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Shaanxi, Peoples R China;

    Northweste Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Shaanxi, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    North Qaidam Orogen; East Kunlun Orogen; Zircon U-Pb geochronology; Tectonothermal event; Paleozoic tectonic transition;

    机译：柴达木北部造山带;东昆仑造山带;锆石U-Pb年代学;构造热事件;古生代构造转变;

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