| 阿尔金北缘EW向山脉新生代隆升剥露的裂变径迹证据 |
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| 引用本文：孙岳,陈正乐,陈柏林,韩凤彬,周永贵,郝瑞祥,李松彬.2014.阿尔金北缘EW向山脉新生代隆升剥露的裂变径迹证据[J].地球学报,35(1):67-75. |
| DOI：10.3975/cagsb.2014.01.09 |
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| 基金项目:国家自然科学基金项目(编号: 41072071);中国地质调查局地质大调查项目(编号: 1212011220936);国土资源部公益性行业科研专项(编号: 2011311191-02) |
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| 中文摘要:本文主要利用磷灰石裂变径迹测年技术探讨了阿尔金北缘EW向山脉隆升的时空差异特征。22个岩体分别采自阿尔金北缘EW向山体中的卓尔布拉克、大平沟和喀腊大湾地区。裂变径迹测试结果显示, 样品的径迹年龄介于(62.6±3.5)~(28.3±1.7) Ma, 平均径迹长度均介于(13.25±0.15)~(14.29±0.1) μm之间。进一步根据裂变径迹长度和温度数据, 开展了磷灰石温度-时间的反演模拟。结果表明, 阿尔金北缘山体的隆升呈现一定的规律: 在南北方向上, 南部率先隆升并向北部扩展, 东西方向上, 山脉中段大平沟样品径迹年龄较其他样品年龄大且时间局限在古新世和始新世, 呈现中间向两侧隆升趋势。所有样品热史模拟曲线形态相对一致, 径迹长度分布呈单峰式, 表明阿尔金北缘地区可能仅仅新生代经历了古新世—渐新世 (65—28 Ma)的快速隆升-剥露事件, 中新世及后期的构造隆升-剥露事件在本区不发育。对比分析阿尔金地区的隆升剥露热事件可知, 阿尔金山脉新生代的隆升-剥露整体性和差异性共存: 古近纪阿尔金山脉隆升具有普遍性和区域性, 而中新世至今的隆升和剥露仅仅存在于NEE走向阿尔金主断裂带旁侧的山体和NE向的山体, 推测中新世以来阿尔金主断裂带的快速走滑并没有影响阿尔金北缘EW向山体的隆升和剥露。 |
| 中文关键词:裂变径迹 隆升与剥露过程 新生代 阿尔金北缘 |
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| Cenozoic Uplift and Denudation of the EW-trending Range of Northern Altun Mountains: Evidence from Apatite Fission Track Data |
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| Abstract:This paper mainly presents analytical results of apatite fission-track ages to constrain the uplifting characteristics of EW-trending range of Northern Altun Mountains. 22 rock mass samples were collected from Zhuoerbulake, Dapinggou, and Kaladawan in EW-trending mountain range of Northern Altun Mountains. Fission-track ages for these samples range from (62.6±3.5) to (28.3±1.7) Ma with mean track lengths varying from (13.25±0.15) to (14.29±0.1) μm. According to track lengths and measured age data, the authors carried out the inversion simulation on temperature and age of apatite. The results show a specific regularity of the uplifting of Northern Altun Mountains. In the SN direction, the fission-track ages display a uplifting trend from south to north. In the EW direction, the ages of Dapinggou area in the middle mountains were older than those of other areas and confined to Paleocene and Eocene, and imply an uplifting trend from the middle outwards. The similar thermal history simulation lines of all samples and the single peak of track lengths are considered to have been caused by rapid uplifting during the Paleocene-Eocene (63~28 Ma) and steadiness during the Miocene and later periods in the Northern Altun Mountains. A comparative study of the uplifting and exhumation of the whole Altun area shows that the mountains uplifting and denudation of this region had both global and unique features in Cenozoic: the uplifting of the Altun Mountains had universality and regional features in Paleogene, but uplifting and exhumation existed in NEE-trending and NE-trending mountain ranges in Miocene and subsequent period. It is held that the rapid strike-slip Altun fault has had no influence on uplifting and denudation of EW-trending mountain ranges in Northern Altun Mountains since Miocene. |
| keywords:fission track uplift and denudation process Cenozoic North Altun |
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