Paleozoic Tian-Shan as a transitional region between the Rheic and Urals-Turkestan oceans
Paleozoic Tian-Shan as a transitional region between the Rheic and Urals-Turkestan oceans
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DOI：
10.1016/j.gr.2009.11.014
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发表时间：
2010-03-01
影响因子：
6.1
通讯作者：
Seltmann, R.
中科院分区：
文献类型：
--
作者：
Biske, Yu. S.;Seltmann, R.
吉尔吉斯斯坦南天山上古生界造山带（STS）。乌兹别克斯坦和塔吉克斯坦由两个构造域组成：北部的南向的布坎套-科克沙尔（BK），并继续进入新疆（中国），以及南部的北向的泽拉夫尚-希萨尔（ZH），塔吉克斯坦的布坎套-科克沙尔褶皱带在晚石炭世向南逆冲到克孜勒库姆-阿莱大陆和塔里木大陆上。 BK带是古生代天山最突出的与碰撞有关的高山型部分，作为天山结构的延伸，与乌拉尔山脉的西部（外部、西辐合）部分非常相似。哈萨克斯坦大陆是BK碰撞带的腹地。哈萨克斯坦是由古代（可能是冈瓦纳）大陆地体和海洋衍生地壳元素的增生过程构成的。早古生代至早石炭世发挥了作用。地体拼合的主要事件发生在中奥陶世和晚奥陶世，这似乎反映了古亚洲洋边缘发育活跃。该区域大陆地壳构造和原岩年龄的地质差异与 Pb 和 Sm-Nd 同位素数据大体一致。 Zeravshan-Hissar 和 Alai 东部（STS 西南部）相对早期（Visean）北向逆冲构造与 Rheic 起源的中欧 Hercynides 有一些相似之处，尽管该区域成为与大陆闭合相关的活动边缘构造过程的所在地。石炭纪古特提斯洋。碰撞后岩浆作用发生在约 300 至 270 Ma 之间，表现为从 A 型花岗岩到霞石正长岩的多种岩浆类型。岩体的空间分布似乎受到与东西向左旋扳手断层相关的拉张结构的控制。邻近地区同时期碱侵入和高原玄武岩的存在表明，这种岩浆活动可能与地幔柱有关 皇冠版权所有 (C) 2009 由 Elsevier B V 代表国际冈瓦纳研究协会出版 保留所有权利
The Upper Paleozoic orogenic belt of South Tian-Shan (STS) in Kyrgyzstan. Uzbekistan and Tajikistan consists of two structural domains: the south-vergent Bukantau-Kokshaal (BK) in the north and continuing into Xinjiang (China), and the north-vergent Zeravshan-Hissar (ZH) in the south, in Tajikistan The Bukantau-Kokshaal fold belt was thrust south onto the Kyzylkum-Alai and Tarim continents in the Late Carboniferous. The BK belt is the most prominent collision-related, alpine-type part of the Paleozoic Tian-Shan and, as a prolongation of the Tian-Shan structure, shows close resemblance to the western (outer, west-vergent) part of the Urals The Kazakhstan continent acts as a hinterland to the BK collision belt Kazakhstan was constructed by accretion processes in which ancient (presumably Gondwanan) continental terranes and ocean-derived crustal elements of the Early Paleozoic to Early Carboniferous age played a role. The main episode of terrane amalgamation took place during the Middle and Late Ordovician This appears to reflect active margin development in the Paleoasiatic Ocean. and resembles processes occurring in the recent Western Pacific Geological differences in construction and protolith age of continental crust in the region are in general agreement with Pb- and Sm-Nd isotopic data Relatively early (Visean) north-vergent thrust structures in Zeravshan-Hissar and eastern Alai (southwestern STS) bear some resemblance to the Central European Hercynides of Rheic origin, although this region became the location of active margin tectonic processes associated with the closure of the Paleotethys Ocean during the Carboniferous. Post-collisional magmatism occurred from ca 300 to 270 Ma and is represented by a variety of magma types from A-type granites to nepheline syenites. The spatial distribution of plutons appears to be controlled by transtensional structures associated with east-west, left-lateral wrench faulting. The presence of coeval alkali intrusions and plateau basalts in adjacent areas suggests that this magmatism may have been associated with a mantle plume Crown Copyright (C) 2009 Published by Elsevier B V on behalf of International Association for Gondwana Research All rights reserved