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首页> 外文期刊>Radiation measurements >Mesozoic cooling history of the 'Bachu Uplift' in the Tarim Basin, China:Constraints from zircon fission-track thermochronology
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Mesozoic cooling history of the 'Bachu Uplift' in the Tarim Basin, China:Constraints from zircon fission-track thermochronology

机译：塔里木盆地“巴楚隆起”的中生代冷却历史：锆石裂变径迹热年代学的约束

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摘要

We applied zircon fission-track analysis to outcrop and borehole samples to study the Mesozoic cooling history of the Bachu Uplift, the Central Uplift of the Tarim Basin. Zircon fission-track (ZFT) ages of 182 Ma - 249 Ma are younger than the sample depositional ages indicating substantial post burial thermal annealing and can effectively reveal cooling events in the Bachu Uplift. The strong correlation between single grain ZFT age and U content indicates that most of the zircon grains represent ages that have been partially annealed and so the age is not directly indicative of the time of cooling. The youngest ZFT age populations with modal peak ages of 151 ± 8 Ma (Well HT1 samples), 126 ± 6 Ma (Well T1 samples) and 192 ± 10 Ma (Xiaohaizi Reservoir profile samples) from the decomposition of the ZFT single-grain ages represent the onset of cooling events in the Bachu Uplift, which were related to the collisions of the Qiangtang Terrane and Lhasa Block with the southern margin of the Eurasia continent, respectively. This study provides new insights into the tectonic and sedimentary evolution of the Tarim Basin and even Central Asia by constraining the higher temperature (c. 250-180℃) part of the basin thermal history.
机译：我们将锆石裂变径迹分析应用于露头和钻孔样品，以研究巴楚隆起，塔里木盆地中央隆升的中生代冷却历史。锆石裂变径迹（ZFT）年龄为182 Ma-249 Ma，比样品沉积年龄年轻，这表明埋藏后发生了大量的热退火，并且可以有效地揭示巴楚隆起的冷却事件。单晶ZFT年龄与U含量之间的强相关性表明，大多数锆石晶粒代表已部分退火的年龄，因此该年龄并不直接指示冷却时间。 ZFT单粒年龄分解产生的模式峰值年龄分别为151±8 Ma（HT1井），126±6 Ma（T1井）和192±10 Ma（小海子水库剖面样品）的最年轻ZFT年龄种群。代表巴楚隆起的降温事件的发生，这分别与the塘地带和拉萨地块与欧亚大陆南缘的碰撞有关。通过限制盆地热史的较高温度（约250-180℃），该研究为塔里木盆地乃至中亚的构造和沉积演化提供了新的见解。

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