| 东昆仑野马泉地区磷灰石裂变径迹热年代学及构造意义 |
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| 引用本文： | 朱传宝,孙非非,袁万明,张爱奎,张大明,马忠元,周青禄,王生明,赵梦琪,刘光莲.东昆仑野马泉地区磷灰石裂变径迹热年代学及构造意义[J].地球科学,2018,43(6):2019-2028. |
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| 作者姓名： | 朱传宝 孙非非 袁万明 张爱奎 张大明 马忠元 周青禄 王生明 赵梦琪 刘光莲 |
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| 作者单位： | 1.青海省第三地质矿产勘查院, 青海西宁 810029 |
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| 基金项目： | 国家自然科学基金项目41172088柴达木盆地南北缘成矿系统与勘查开发示范项目2016-SF-A3国家重点基础研究发展规划项目2015CB452606国土资源部公益性行业科研专项经费项目201411025国家自然科学基金项目41730427 |
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| 摘 要： | 通过对东昆仑西段野马泉地区所获得的5个磷灰石样品的裂变径迹分析, 探讨该地区构造演化特征.磷灰石裂变径迹年龄分为153.8 Ma、106.8~81.0 Ma、48.7~44.4 Ma 3个年龄组, 其中153.8 Ma记录了班公湖-怒江洋闭合事件; 106.8~81.0 Ma是拉萨地块与羌塘地块碰撞拼合事件对东昆仑地区的远程效应; 48.7~44.4 Ma是印度-欧亚大陆碰撞之后伸展事件的体现.野马泉地区热历史分为3个阶段:第1阶段(130~110 Ma)持续隆升, 对应班公湖-怒江洋闭合后拉萨地块与羌塘地块拼合事件; 第2阶段(110~14 Ma)持续隆升, 90 Ma之前隆升速度较快, 与阿尔金断裂走滑及西大滩断裂韧性变形有关, 90 Ma之后进入一个时间较长的平稳抬升期; 第3阶段(14 Ma至今)受青藏高原新近纪以来强烈构造活动的影响, 快速隆升.3个阶段的隆升速率和隆升量分别0.021 mm/a和0.42 km、0.01 mm/a和1.0 km、0.1 mm/a和1.43 km, 平均隆升速率为0.028 mm/a, 总隆升量为2.86 km.
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| 关 键 词： | 裂变径迹 构造 热历史模拟 岩石隆升 磷灰石 东昆仑 |
| 收稿时间： | 2018-01-17 |
Apatite Fission Track Thermochronology and Tectonic Significance in Yemaquan Area,East Kunlun |
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| Abstract: | We present the tectonic evolution characteristics of Yemaquan area, which is located in west of the East Kunlun Mountains, according to apatite fission track thermochronology analysis.The results show that apatite fission track ages mainly are divided into three groups, including 153.8 Ma, 106.8 to 81.0 Ma, and 48.7 to 44.4 Ma, respectively.The Bangonghu-Nujiang ocean closure event happened in 153.8 Ma, then the collision and combination of Lhasa block and Qiangtang block on the East Kunlun area mainly ranged from 106.8 to 81.0 Ma, and post-orogenic stretching events after the collision between the India-Eurasia occurred during 48.7 Ma and 44.4 Ma.In addition, the analysis results also indicate that three stages of thermal history of Yemaquan area are mainly ranged from 130 to 110 Ma, 110 to 14 Ma, and 14 Ma to now, respectively.The first stage, 130-110 Ma, corresponds to collision activity between the Lhasa and the Qiangtang block after the closed up of the Bangonghu-Nujiang oceanic basin.The second stage, 110-14 Ma, rised continuously, with strike-slip movement of Alkin fault and the ductile deformation of the Xidatan fault occurred during 110-90 Ma.And the last stage, 14 Ma to now, uplifted rapidly, and affected by strong tectonic activity of Tibetan plateau since Neogene.Uplift rates and uplift ranges for these three stages are estimated of 0.021 mm/a and 0.42 km, 0.01 mm/a and 1.0 km, and 0.1 mm/a and 1.43 km, respectively, with the average uplift rate and the total uplift height of 0.028 mm/a, and 2.86 km, respectively. |
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