哈萨克斯坦Ust-Kamenogorsk地区额尔齐斯构造带构造演化的年代学制约
Tectonic Evolution of the Iritish belt in Ust-Kamenogorsk Area, Kazakhstan: New Geochronological Evidence
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摘要: 额尔齐斯构造带呈北西-南东向从西西伯利亚南缘经Ust-Kamenogorsk、斋桑进入中国的阿勒泰,向南东方向延伸进入蒙古南戈壁地区,全长超过2 000km,是中亚造山带重要的构造边界之一。对哈萨克斯坦境内Ust-Kamenogorsk地区额尔齐斯构造带的宏观岩石-构造特征和不同岩石类型锆石U-Pb定年研究表明,Ust-Kamenogorsk地区的额尔齐斯构造带的强变形片麻岩变质时间发生在460~400Ma,代表了加里东期的碰撞造山事件。侵入其中的片麻状花岗岩的结晶年龄为282Ma,而最晚期切穿构造面理的块状花岗岩的结晶年龄为252Ma。结合前人的研究成果综合分析,表明额尔齐斯构造带经历了古生代的板块拼合、二叠纪的左旋走滑以及三叠纪西伯利亚地幔柱事件导致的岩浆岩侵入等主要构造演化阶段。
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关键词:
- Ust-Kamenogorsk /
- 额尔齐斯构造带 /
- 锆石U-Pb年龄 /
- 构造演化阶段
Abstract: The Iritish belt, served as one of the most important tectonic boundary in Central Asian Orogenic Belt (CAOB), extends more than 2 000 kilometers from west Siberian, through Ust-Kamenogorsk and Zhaisang Lake in Kazakhstan, Chinese Altai and then into Mogonia. In combination with systematic geochronological data, the detailed field observation along the Iritish belt in Ust-Kamenogorsk have been reported in this paper, aiming to have a better understanding its tectonic evolution process.The data reveals that amphibolite-facies metamorphism of the gneiss in this belt took place during 460~400 Ma, representing the Caledonian orogenic event. The gneissic granitesintruded into the gneiss along the lamellar structure and crystallized at ca.282 Ma, while the massive granodiorites sharply cut across the schistosity, with crystallized age of ca.252 Ma. Based on these observations, the evolution process of the Iritish belt can be divided into three stages at least, i.e., the Caledonian orogenic event (460~400 Ma), the Permian sinistral strike-slip and the Triassic magmatic event possibly related to the Siberia mantle plume.-
Key words:
- Ust-Kamenogorsk /
- Iritish belt /
- zircon U-Pb age /
- tectonic evolution
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