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Relationships between Meso-Cenozoic denudation in the Eastern Tian Shan and uranium mineralization in the Turpan-Hami basin, NW China: Constraints from apatite fission track study
Ore Geology Reviews ( IF 3.3 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.oregeorev.2020.103820
Zhang Xin , Nie Fengjun , Su Xuebin , Xia Fei , Li Mangen , Yan Zhaobin , Zhang Chengyong , Feng Zhibing

Abstract The Eastern Tian Shan tectonic belt, located in the southern domain of the Central Asian Orogenic Belt, consists of the Bogda mountain range, Turpan-Hami (Tuha) basin and Choltagh mountain range from north to south. Understanding the Meso-Cenozoic denudation history of the Eastern Tian Shan is critical to unravel the genesis of sandstone-type uranium (U) mineralization in the Tuha basin. In this paper, thirteen granite and sandstone samples were collected along two north–south transects in the west of the Eastern Tian Shan for apatite fission track thermochronological study. The apatite fission track ages obtained in this study, in combination with the thermal history modeling results and previous thermochronological data, indicate three main episodes of denudation in the Eastern Tian Shan since the Mesozoic, i.e., Late Jurassic to Early Cretaceous (160–135 Ma), Late Cretaceous to Early Eocene (100–50 Ma) and Late Eocene to Early Miocene (35–20 Ma). The Late Cretaceous denudation events are related to the Kohistan-Dras arc accretion-collision that affects the Tian Shan mountain range extensively, whereas the Cenozoic ones are related to the India-Asia collision. Regional distribution of apatite fission track ages in the Eastern Tian Shan and comparison with U mineralization ages in the Tuha basin suggest that the Choltagh mountain range began to denudate in the Late Jurassic, exposing high U-bearing volcanic rocks on the surface and resulting in significant U mineralization in the southern part of the Tuha basin in the Cretaceous, whereas the Bogda mountain range in the north did not experience significant denudation until the Late Eocene. Due to the relatively low exhumation of the Bogda mountain range and limited exposure of U-bearing rocks, U mineralization in the Tuha basin is minor during the Cenozoic, but the newly deposited sediments helped the preservation of the U deposits that were formed in the Cretaceous.

中文翻译:

东天山中新生代剥蚀与吐哈盆地铀矿化的关系:磷灰石裂变径迹研究的制约

摘要 东天山构造带位于中亚造山带南域,自北向南由博格达山脉、吐哈(吐哈)盆地和乔尔塔格山脉组成。了解东天山的中新生代剥蚀历史对于解开吐哈盆地砂岩型铀矿化成因至关重要。本文在东天山西部沿南北两条横断面采集了 13 个花岗岩和砂岩样品,用于磷灰石裂变径迹热年代学研究。本研究获得的磷灰石裂变径迹年龄,结合热史模拟结果和先前的热年代学数据,表明自中生代以来东天山发生了三个主要的剥蚀事件,即 晚侏罗世至早白垩世(160-135 Ma),晚白垩世至早始新世(100-50 Ma)和晚始新世至早中新世(35-20 Ma)。晚白垩世剥蚀事件与广泛影响天山山脉的Kohistan-Dras弧增生碰撞有关,而新生代剥蚀事件与印度-亚洲碰撞有关。东天山磷灰石裂变径迹年龄区域分布与吐哈盆地U成矿年龄对比表明,乔尔塔格山脉于晚侏罗世开始剥蚀,地表出露高含U的火山岩,造成显着的白垩纪吐哈盆地南部的 U 矿化,而北部的博格达山脉直到晚始新世才经历显着剥蚀。
更新日期:2020-12-01
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