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首页> 外文期刊>Precambrian Research >The Paleoproterozoic magmatic-metamorphic events and cover sediments of the Tiekelik Belt and their tectonic implications for the southern margin of the Tarim Craton, northwestern China
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The Paleoproterozoic magmatic-metamorphic events and cover sediments of the Tiekelik Belt and their tectonic implications for the southern margin of the Tarim Craton, northwestern China

机译：Tiekelik带的古元古代岩浆变质事件和覆盖沉积及其对中国西北塔里木克拉通南缘的构造意义

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摘要

The Tiekelik Belt in the southwestern part of the Tarim Craton, NW China, consists of Archean-Paleoproterozoic orthogneisses, and granitoids, and younger sedimentary successions. U-Pb dating of Paleoproterozoic rocks in the Tiekelik Belt has provided new information on the southwestern margin of the Tarim Craton. Two orthogneisses from the Heluositan Complex yielded crystallization ages in the interval 2310-2260 Ma and metamorphic ages of 2040-2007 Ma and 1830 Ma, respectively. Two syenogranites from the Buweituwei pluton yielded crystallization ages of 1900 and 1795 Ma. Detrital zircon analyses from sedimentary rocks nonconformably overlying the Buweituwei and Akazi plutons indicate maximum depositional ages between 1950 Ma and 1780 Ma. Major detrital inputs are from the basement in the region and form prominent peaks at 1900-1800 Ma and 2300-2200 Ma. Our new data, combined with previous results, allow us to summarize the Archean-Paleoproterozoic tectonic evolution of the Tiekelik Belt as follows: (1) Emplacement of Archean-aged TTG magmas during the 3.14-2.76 Ga interval; (2) A series of 2.41-2.26Ga magmatic events that represent an important period of crustal reworking within the Tarim craton; (3) 2.03-1.80 Ga magmatic and metamorphic events that include the emplacement of a 1.9 Ga mafic dyke suite into the Heluositan Complex along with several episodes of intraplate magmatism. The late magmatic events are coeval with metamorphism and may support an orogenic extensional model for the Tiekelik Belt during the 1.9-1.8 Ga interval; (4) post-1.8 Ga subsidence and formation of a Changcheng sequence in the Tiekelik Belt. The Paleoproterozoic ages of major tectonothermal events within the Tiekelik, North Altyn-Dunhuang block and Alashan block are almost identical and it is argued that they were connected at that time as North China and Tarim were part of the larger Columbia supercontinent.
机译：中国西北地区塔里木克拉通西南部的铁克力克带包括太古宙古古生界正片麻岩，花岗岩和较年轻的沉积演替。泰克力克带古元古代岩石的U-Pb测年提供了有关塔里木克拉通西南缘的新信息。来自Heluositan Complex的两个直生片麻岩的结晶年龄分别为2310-2260 Ma和2040-2007 Ma和1830 Ma的变质年龄。布威图维岩体中的两个辉长岩的结晶年龄分别为1900和1795 Ma。从布威图维和阿卡齐岩体不整合地上覆的沉积岩中进行的碎屑锆石分析表明，最大沉积年龄在1950 Ma至1780 Ma之间。主要的碎屑输入来自该地区的地下室，并在1900-1800 Ma和2300-2200 Ma处形成突出的峰值。我们的新数据，结合以前的结果，使我们可以概括如下泰克力克带太古宙古生代构造演化：（1）在3.14-2.76 Ga间隔内太古宙时代TTG岩浆的位置; （2）一系列2.41-2.26Ga岩浆事件，代表塔里木克拉通内地壳重做的重要时期; （3）2.03-1.80 Ga岩浆和变质事件，包括将1.9 Ga镁铁质岩脉组放入Heluositan岩体中，以及多次板内岩浆活动。晚期岩浆事件与变质同时期，并可能支持在1.9-1.8 Ga间隔内Tiekelik带的造山伸展模型。 （4）铁克力克带1.8 Ga的下沉和长城序列的形成。在铁克力克，北阿尔汀-敦煌区块和阿拉善区块内，主要构造热事件的古元古代年龄几乎相同，并且据称当时它们是相互联系的，因为华北和塔里木是哥伦比亚大大陆的一部分。

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