| 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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| 关键词:fission track uplift and denudation process Cenozoic North Altun |
| 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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| Cenozoic Uplift and Denudation of the EW-trending Range of Northern Altun Mountains: Evidence from Apatite Fission Track Data |
| 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. |
| SUN Yue,CHEN Zheng-le,CHEN Bai-lin,HAN Feng-bin,ZHOU Yong-gui,HAO Rui-xiang,LI Song-bin.2014.Cenozoic Uplift and Denudation of the EW-trending Range of Northern Altun Mountains: Evidence from Apatite Fission Track Data[J].Acta Geoscientica Sinica,35(1):67-75. |
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