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首页> 外文期刊>Journal of Asian earth sciences >U-Pb ages of detrital zircon from Cenozoic sediments in the southwestern Tarim Basin, NW China: Implications for Eocene-Pliocene source-to-sink relations and new insights into Cretaceous-Paleogene magmatic sources
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U-Pb ages of detrital zircon from Cenozoic sediments in the southwestern Tarim Basin, NW China: Implications for Eocene-Pliocene source-to-sink relations and new insights into Cretaceous-Paleogene magmatic sources

机译：中国西北塔里木盆地新生代沉积物中碎屑锆石的U-Pb年龄：对始新世-上新世烃源关系的启示和对白垩纪-古近纪岩浆源的新见解

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摘要

A detailed investigation of potential provenance is still lacking in the southwestern Tarim Basin, which restricts our complete understanding of Cenozoic source-to-sink relations between the basin interior and the Pamir salient - western Kunlun Mountain Range. Debate also exists concerning the potential sources of the Paleogene and Cretaceous igneous detritus present in the Cenozoic sedimentary sequences. Here, we present U-Pb (LA-ICP-MS) ages of detrital zircons from the continuous Eocene-Pliocene sediment series in the well-exposed Aertashi section to investigate changes in sediment provenance through time. The U-Pb detrital zircon ages range widely from 45 to 3204 Ma and can be divided into seven main groups: 45-65 Ma (sub-peak at 49 Ma), 67-103 Ma (sub-peak at 95 Ma), 196-251 Ma (sub-peak at 208 Ma), 252-416 Ma (sub-peak at 296 Ma), 417-540 Ma (sub-peak at 446 Ma), 550-1429 Ma (sub-peaks at 614 Ma, 828 Ma and 942 Ma) and 1345-3204 Ma (sub-peaks at 1773 Ma and 2480 Ma). These zircons were mainly derived from the western Kunlun Mountain Range and northern Pamir salient to the west and south. The evolution of the provenance and source-to-sink relationship patterns in the southwestern Tarim Basin can be divided into three stages: (1) The Middle Eocene to Lower Oligocene sediments display a wide variety of detrital zircon ages, suggesting that the source area was extensive. (2) A major change in provenance occurred during the Late Oligocene to Early Miocene and was characterized by an abrupt increase in the proportion of Triassic and Lower Paleozoic igneous components, implying a significant adjustment in topography induced by the initial uplift and exhumation of the western Kunlun Mountain Range and northern Pamir salient. (3) In the Late Miocene, the source-to-sink system transformed again, and contributions of Triassic to Lower Paleozoic material weakened substantially due to the sufficient indentation of the Pamir salient. Our integrated analyses of zircon geochronology indicate that the main source terranes of the Paleogene and Cretaceous igneous detritus are the central and southern Pamir salient, respectively, which are speculated to have been continuously connected to the study area during Eocene-Pliocene times, although such detritus is scarce in certain formations and has not yet been detected.
机译：塔里木盆地西南部仍缺乏对潜在物源的详细研究，这限制了我们对盆地内部与帕米尔凸部-昆仑山脉西部之间新生代的源-汇关系的完整理解。关于新生代沉积序列中存在的古近纪和白垩纪火成岩碎屑的潜在来源也存在争论。在这里，我们从暴露良好的Aertashi剖面中的始新世-上新世沉积物系列的连续碎屑锆石的U-Pb（LA-ICP-MS）年龄中来调查随时间变化的沉积物来源的变化。 U-Pb碎屑锆石的年龄范围从45到3204 Ma，可以分为七个主要组：45-65 Ma（低于49 Ma的峰值），67-103 Ma（低于95 Ma的峰值），196 -251 Ma（子峰值在208 Ma），252-416 Ma（子峰值在296 Ma），417-540 Ma（子峰值在446 Ma），550-1429 Ma（子峰值在614 Ma， 828 Ma和942 Ma）和1345-3204 Ma（子峰值分别为1773 Ma和2480 Ma）。这些锆石主要来自昆仑山脉西部和北部和南部的帕米尔凸起。塔里木盆地西南部的物源演化和源-汇关系模式可分为三个阶段：（1）中始新世至下渐新世沉积物具有广泛的碎屑锆石年龄，表明其源区为广泛。 （2）始新世发生了重大变化，始于中新世晚期至中新世，其特征是三叠纪和下古生界火成岩成分的比例突然增加，这意味着由于西部的最初隆升和掘出而引起的地形发生了重大变化。昆仑山脉和帕米尔北部突出。 （3）在中新世晚期，源-汇系统再次转变，由于帕米尔凸起的充分压痕，三叠纪对下古生界的贡献大大减弱。我们对锆石年代学的综合分析表明，古近纪和白垩纪火成岩碎屑的主要来源地层分别是中部和南部的帕米尔凸起，据推测，它们在始新世-上新世时期一直与研究区保持着连续联系，尽管这些碎屑在某些编队中稀缺，尚未被发现。

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  • 来源
    《Journal of Asian earth sciences》 |2018年第may1期|26-40|共15页
  • 作者

    Yang Wei; Fu Ling; Wu Chaodong; Song Yan; Jiang Zhenxue; Luo Qun; Zhang Ziya; Zhang Chen; Zhu Bei;

  • 作者单位

    China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China;

    PetroChina, RIPED, Beijing 100083, Peoples R China;

    Peking Univ, Sch Earth & Space Sci, Minist Educ, Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China;

    China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China;

    China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China;

    China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China;

    China Geol Survey, Oil & Gas Survey, Beijing 100029, Peoples R China;

    China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China;

    Southwest Petr Univ, Sch Geosci & Technol, Chengdu 610500, Sichuan, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Detrital zircon; U-Pb; Provenance; southwestern Tarim Basin; Pamir salient; Western Kunlun Mountain Range;

    机译：碎屑锆石;U-Pb;物源;塔里木盆地西南部;帕米尔高原;西昆仑山脉;

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