伊犁盆地南缘沉积构造演化与砂岩型铀矿化的关系——来自磷灰石裂变径迹的证据  

The Coupling Relationship Between Sandstone Type Uranium Mineralization and Sedimentary tectonic Evolution in the South Margin of Yili Basin---Evidence from Apatite Fission Track

作　　者：潘澄雨[1] 刘红旭[1] 陈正乐[2] 张晓[1] 王永文[1] 孟云飞[1] 丁波[1] 

机构地区：[1]核工业北京地质研究院,北京100029 [2]中国地质科学院地质力学研究所,北京100081

出　　处：《铀矿地质》2015年第A01期206-212,共7页Uranium Geology

摘　　要：盆山耦合研究是大陆动力学研究的一个重要组成部分。笔者主要通过磷灰石裂变径迹测年结果来限定西天山山脉的隆升剥露过程，探讨盆山耦合及其对成矿的控制作用。野外样品系统采集于西天山山脉及伊犁盆地南缘钻孔中，选磷灰石开展了裂变径迹测试分析，并开展了磷灰石的温度时间反演模拟研究。结果表明，西天山至少存在4个阶段的构造隆升剥露事件，时间上分别为：三叠纪末侏罗纪早期（220-180Ma）、侏罗纪中期（170-140Ma），白垩纪中期（110-80Ma）和新生代期间（24Ma 以来）。根据盆地钻孔样品测试结果，结合区域资料分析和伊犁盆地沉积构造演化过程、伊犁盆地砂岩型铀矿成矿阶段研究，表明西天山山脉的构造隆升剥露过程与伊犁盆地南缘沉积构造演化、砂岩型铀矿成矿作用具有很好的耦合关系。Study of mountain basin coupling is an important part of continental dynamics research.This paper mainly presented the analyses results of apatite fission track both from western Tianshan range and the Yili basin to reveal the up roofing history of the western Tianshan and to explore the control effect of mountain basin coupling to mineralization.25 samples, including granite, volcanics, sandstones from middle western Tianshan,Chabuchaer mountain and the drilling wells in southern part of the Yili basin were collected,and apatite was selected for fission track dating in the lab.Temperature time modeling of apatite was also completed based on data measurements of fission track length and age.Analyses results revealed that the western Tianshan has probably experienced four phases of rapid cooling events during the Mesozoic to Cenozoic, i.e.from Late Triassic to Early Jurassic （220 -180Ma）,Middle Jurassic （1 70 - 140Ma ）, Middle Cretaceous （110 - 80Ma ）, and Late Cenozoic （since 24 Ma）.Combined with regional data analysis,basin sedimentary tectonic evolution process, and basin sandstone type uranium mineralization stage research,samples test results in basin drilling revealed that sedimentary tectonic evolution and sandstone type uranium mineralization of Yili basin have good coupling relationship with tectonic uplift and denudation processes of western Tianshan.

关 键 词：裂变径迹 伊犁盆地南缘 盆山耦合 成矿作用 

分 类 号：P598[天文地球—地球化学]