| 天山山脉中新生代差异隆升及其机制探讨 |
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| 引用本文： | 孙岳,陈正乐,王永,韩凤彬,吴玉,孟令通,张昊.天山山脉中新生代差异隆升及其机制探讨[J].大地构造与成矿学,2016(2):335-343. |
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| 作者姓名： | 孙岳 陈正乐 王永 韩凤彬 吴玉 孟令通 张昊 |
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| 作者单位： | 1. 东华理工大学地球科学学院，江西南昌 330013; 中国地质科学院地质力学研究所，北京 100081; 中国地质大学 北京 地球科学与资源学院，北京 100083;2. 东华理工大学地球科学学院，江西南昌 330013; 中国地质科学院地质力学研究所，北京 100081;3. 中国地质科学院地质力学研究所,北京,100081;4. 中国地质大学 北京 地球科学与资源学院,北京,100083 |
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| 基金项目： | 国家自然科学基金新疆联合重点基金(U1403292)，国家科技支撑计划项目(2015BAB0613-4)，中国地质调查局地质大调查项目(12120115033801)，公益性行业科研专项(201411024-3)联合资助。 |
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| 摘 要： | 为了揭示长约2500 km的天山山脉中新生代隆升特征,本文系统梳理分析了已发表的磷灰石裂变径迹数据和本次野外采样测得磷灰石裂变径迹数据约460个,岩性以花岗岩和砂岩为主。结果显示整个天山山脉隆升具有明显的时空差异性。白垩纪以前记录的径迹数据约占14%,白垩纪以来的数据约占86%,晚古生代末天山已有径迹年龄记录,到晚侏罗世天山部分地区发生隆升,整体隆升不明显,早白垩世以来整个天山普遍隆升,且存在多期隆升事件,但隆升剥蚀速率存在明显差异。南北方向上,自南向北径迹年龄有减小的趋势,揭示山脉隆升自南天山向北天山扩展;东西方向上,西天山隆升时限较东天山隆升早,但白垩纪以来东、西天山均有隆升记录。天山山脉差异性隆升是不同陆块对亚洲板块南缘碰撞增生作用的共同结果,其内部块体的结构特征和力学性质是差异隆升的基础和前提。
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| 关 键 词： | 天山山脉 差异隆升 裂变径迹 中新生代 |
Mechanisms of Meso-Cenozoic Differential Uplift of Tianshan Mountains |
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| Abstract: | This paper discusses the characteristics of the Meso-Cenozoic uplift and exhumation of the about 2500 km long Tianshan Mountains, on the basis of more than 460 ages of apatite fission track including our own work and those in the literatures. The results show that the uplift and exhumation history of whole Tianshan Mountains is obviously differential both temporally and spatially. About 14% of apatite fission track datas record the uplift before Cretaceous, and 86% for the uplift since Cretaceous. Local uplift of the Tianshan Mountains took place at the end of Late Paleozoic, and more in Late Jurassic, whereas uplift the whole Tianshan Mountains occurred since Early Cretaceous. The periodic uplift and exhumation of the Tianshan Mountain are heterogeneous. The northward decrease of fission track ages reveals a south to north uplifting. The west Tianshan Mountain uplifted earlier than the east Tianshan Mountain, however, Cretaceous and Cenozoic uplifts were recorded in the whole Tianshan Mountains. The differential uplifting of the Tianshan Mountains is likely the result of collisions of continental blocks and the accretion to the southern Asia plate. The internal structural characteristics and mechanical properties of the Tianshan Mountains are causes of differential uplift and exhumation. |
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| Keywords: | Tianshan Mountains differential uplifting fission track Meso-Cenozoic |
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