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| 东天山造山带右行剪切变形及构造演化的40Ar-39Ar年代学证据 | |
| 引用本文： | 王瑜,李锦轶,李文铅.东天山造山带右行剪切变形及构造演化的40Ar-39Ar年代学证据[J].新疆地质,2002,20(4):315-319. |
| 作者姓名： | 王瑜 李锦轶 李文铅 |
| 作者单位： | 1. 中国地质大学地质实验中心,北京,100083 2. 中国地质科学院地质研究所,北京,100037 3. 新疆维吾尔自治区地质矿产勘查局第一区域地质调查大队,新疆,乌鲁木齐,830000 |
| 基金项目： | 中国地质调查局国土资源大调查项目(DKD9902002)和科学技术部重点发展规划项目(2001CB4O9810,G1999043204)共同资助 |
| 摘 要： | 对新疆东天山觉罗格地区克孜尔塔格岩体（舌状岩体）角闪石、黑云母和钾长石进行了^40Ar/^39Ar年代学及热年代学研究，为确定该区右行走滑作用及NS向挤压作用结束的时间，提供了科学依据。研究表明，东天山造山带，NS向挤压作用结束于276Ma，右行走滑发生于276Ma至240－239Ma间，主要集中于276－253.9Ma。 |
| 关 键 词： | 东天山地区 ^40Ar／^39Ar年代学 挤压作用 氩同位素 剪切作用 变形机制 地质构造 |
| 文章编号： | 1000-8845(2002)04-315-05 |
| 修稿时间： | 2002年8月6日 |
40Ar-39Ar CHRONOLOGICAL EVIDENCE OF DEXTRAL SHEAR AND TECTONIC EVOLUTION OF THE EASTERN TIANSHAN OROGENIC BELT |
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| WANG Yu,LI Jinyi,LI Wenqian.40Ar-39Ar CHRONOLOGICAL EVIDENCE OF DEXTRAL SHEAR AND TECTONIC EVOLUTION OF THE EASTERN TIANSHAN OROGENIC BELT[J].Xinjiang Geology,2002,20(4):315-319. | |
| Authors: | WANG Yu LI Jinyi LI Wenqian |
| Abstract: | To better constrain the timing of the dextral strike-slip movement in the eastern Tianshan orogen, a 40Ar/39Ar thermochronological study has been carried out on a Jiaoluotage granitic batholith. Hornblende, biotite, quartz and k-feldspar selected from quartz-mica diorite, granodiorite and quartz veins have been analyzed. At the same time, their cooling histories have been re-constructed. Ranges of 40Ar/39Ar data indicate that hornblendes of two samples have the same cooling age (276 Ma), but biotite minerals have different ages from 261 Ma to 253.9 Ma. And k-feldspar from the two samples yields the same plateau and isochronal age (240-239 Ma). During 276 Ma to 240-239 Ma, at eastern and western parts of the tongue-shaped granitic batholith, different cooling histories had been recorded, which, perhaps, represent the beginning and ending of dextral strike-slip movement. During the time of 287 Ma (?) to 240-239 Ma, syn-deformation granite was intruded, and at the time of 240-239 Ma, k-feldspar was crystallized and granitic intrusion was completed, during which fast cooling process was developed. 40Ar/39Ar dating and related cooling paths indicate that the N-S compression in the eastern Tianshan orogen was finished before 276 Ma and dextral strike-slip movement occurred during 276 Ma to 240-239 Ma, principally from 276 Ma to 253.9 Ma. |
| Keywords: | the eastern Tianshan mountains dextral shear 40Ar-39Ar chronology erogenic evolution |
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