安徽藕塘-滁县-上腰铺一带构造演化的磷灰石裂变径迹年代学约束
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1.山西工程技术学院;2.中国地质大学;3.中国科学技术大学;4.中国地质调查局烟台海岸带地质调查中心,山东烟台 264004

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国家自然科学基金项目(项目号:42127801,42030801);自然资源部同位素地质重点实验室开放课题基金资助;山西省教育厅项目(批准号:2022L593);山西工程技术学院科技资助项目 (批准号:2021QD-21);来晋工作优秀博士资助项目(批准号:2022PT-03)


Multi-stage tectonic events constrained by apatite fission-track thermochronology in the Outang-Chuxian-Shangyaopu, Anhui Province
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1.The Cultivation Base of Shanxi Key Laboratory of Mining Area Ecological Restoration and Solid Wastes Utilization,Shanxi Institute of Technology,Yangquan;2.Institute of Earth Science,China University of Geosciences,Beijing;3.University of Science and Technology of China;4.Yantai Center of Coastal Zone Geological Survey, China Geological Survey, Yantai, 264000

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    摘要:

    安徽藕塘-滁县-上腰铺一带位于华北克拉通东南缘、长江中下游成矿带北缘,秦岭—大别造山带北部前锋带、郯庐断裂带东侧,是周边多种大型区域动力学系统交汇、过渡部位,且周边发育大量铜矿床具重要经济价值,但区域内低温热历史研究程度较低,对该区进行磷灰石裂变径迹热史分析对认识区域构造演化具有重要意义。我们利用磷灰石裂变径迹对藕塘-滁县-上腰铺一带的构造活动展开研究,获得9件磷灰石裂变径迹分析结果,中心年龄最大值为113.2±7.8 Ma,最小值为78.6±5.3 Ma。热史模拟研究结果显示郯庐断裂带周边经历了多期次热事件:藕塘-滁县-上腰铺一带在130~100 Ma体现出快速降温,其动力背景与伊泽纳崎板块的高速斜向俯冲相关;100~60 Ma 研究区降温较缓慢,直至~60 Ma在安徽藕塘-上腰铺一带出现较快速降温,为印度板块与欧亚板块碰撞远程效应的体现。热历史较清晰的反映了印度板块与欧亚板块硬碰撞(55~52 Ma)对研究区热史的影响,印度板块与欧亚板块硬碰撞开始后造成了藕塘-上腰铺一带较快速降温,至此研究区受控于太平洋板块俯冲和印度板块与欧亚板块碰撞远程效应两大构造体系。

    Abstract:

    The Outang-Chuxian-Shangyaopu area in Anhui is located in the southeastern margin of the North China Craton, the northern margin of the Middle-Lower Yangtze River Ore Belt, the northern frontal belt of the Qinling-Dabie orogenic belt, and the east side of the Tanlu fault zone (TLFZ). The study area is located at the intersection and transition of various large-scale regional dynamical systems, and a large number of copper deposits are developed around it, which has important economic value. However, the degree of low-temperature thermal history research in the region is low, and the analysis of the thermal history of apatite fission track in this region is of great significance for understanding the regional tectonic evolution. We used apatite fission track to study the tectonic activities in the area of Outang-Chuxian-Shangyaopu. In this paper, we obtained nine apatite fission track results with central age between 113.2±7.8 Ma and 78.6±5.3 Ma. The study reveals the TLFZ has experienced multi-phase thermal events. The Outang-Chuxian-Shangyaopu area showed rapid exhumation at 130~100 Ma, possibly related to the high-speed oblique subduction of the Izanagi plate. The exhumation of the study area was relatively slow from ~100 Ma, until ~60 Ma when the far-field effect of the Indian plate and the Eurasian plate was reflected in the Outang-Shangyaopu area. After the hard collision between the Indian plate and the Eurasian plate started, the Outang-Shangyaopu area was exhumated rapidly. Especially, the thermal history clearly reflects the impact of the hard collision between the Indian and Eurasian plates (55~52 Ma) on the thermal history of the study area, and then the study area was controlled by two tectonic systems, which are the subduction of the Pacific plate and the long-range effect of the collision between the Indian plate and the Eurasian plate.

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  • 收稿日期:2024-01-09
  • 最后修改日期:2024-02-25
  • 录用日期:2024-03-12
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