从裂变径迹分析新疆阿尔泰南部地区构造活动与古地形的变化

赵文菊, 袁万明, 刘海涛, 宋高

赵文菊, 袁万明, 刘海涛, 宋高. 从裂变径迹分析新疆阿尔泰南部地区构造活动与古地形的变化[J]. 原子能科学技术, 2013, 47(8): 1458-1467. DOI: 10.7538/yzk.2013.47.08.1458
引用本文: 赵文菊, 袁万明, 刘海涛, 宋高. 从裂变径迹分析新疆阿尔泰南部地区构造活动与古地形的变化[J]. 原子能科学技术, 2013, 47(8): 1458-1467. DOI: 10.7538/yzk.2013.47.08.1458
ZHAO Wen-ju, YUAN Wan-ming, LIU Hai-tao, SONG Gao. Apatite Fission Track Analysis on Tectonic Activities and Paleotopography in Southern Altai Region, Xinjiang, China[J]. Atomic Energy Science and Technology, 2013, 47(8): 1458-1467. DOI: 10.7538/yzk.2013.47.08.1458
Citation: ZHAO Wen-ju, YUAN Wan-ming, LIU Hai-tao, SONG Gao. Apatite Fission Track Analysis on Tectonic Activities and Paleotopography in Southern Altai Region, Xinjiang, China[J]. Atomic Energy Science and Technology, 2013, 47(8): 1458-1467. DOI: 10.7538/yzk.2013.47.08.1458

从裂变径迹分析新疆阿尔泰南部地区构造活动与古地形的变化

Apatite Fission Track Analysis on Tectonic Activities and Paleotopography in Southern Altai Region, Xinjiang, China

  • 摘要: 对阿尔泰东南部地区磷灰石样品进行裂变径迹年龄分析及热历史演化模拟,分析计算岩体的隆升剥蚀速率及隆升剥蚀幅度,力求恢复古地形。裂变径迹年龄在(59.4±5.8)~(109.7±8.1) Ma之间变化,径迹长度为(12.0±2.5)~(13.7±1.5) μm。从热历史模拟结果可看出,总体上经历了三阶段的隆升-剥露热演化模式:108 Ma之前的初始整体隆升阶段;108~28 Ma的缓慢冷却阶段;28 Ma以来的快速冷却过程,冷却速率为1.25~1.61 ℃/Ma,剥蚀量为1.17~1.50 km,是本区剥露最快时期。对所有样品单颗粒年龄及混合年龄进行分析统计得到4组年龄,这种年龄不均匀分布亦是不均匀构造抬升的一种反映,主要受抬升速率差异的影响。90 Ma至今,古地形高度变化为3 895~821、2 250~762 m等,变化幅度高达3 300~1 400 m,研究区可见高山成谷,谷地抬升的现象,各阶段古地形情况显而易见。反演古地形并进行均衡校正可知,均衡回弹在阿尔泰地区造山后期的岩石抬升中起重要作用。

     

    Abstract: This work engages apatite fission track evidences on thermotectonic history, rock uplift rate, denudation extent in southeastern Altai region. Fission track ages of 14 samples range from (59.4±5.8) Ma to (109.7±8.1) Ma and the length is between (12.0±2.5) μm and (13.7±1.5) μm. Thermal modeling reveals that the samples have a three-stage of uplift-cooling history. The first stage is in an overall initial uplift before 108 Ma, the second stage from 108 Ma to 28 Ma experiences a slow cooling phase, and the last stage through a rapid-cooling process since 28 Ma with a cooling rate 1.25-1.61 ℃/Ma and denudation amount 1.17-1.50 km, the fast exhumation period in the area. The sample ages could be divided into 4 age groups, reflecting multiple tectonic events with different uplift rates. The paleotopography altitude changes from 3895 m to 821 m, 2250 m to 762 m etc., and the amplitude of changes reaches to 3300-1400 m since 90 Ma. The phenomenon of Alpine turning to valley and valley uplifting is visible in the studied area, indicating various stages of paleotopography. Based on inversion of ancient landform and equilibrium correction, the equilibrium rebound would play an important role in the rock uplift during the Altai post-orogenic period.

     

  • [1] 左国朝,张淑玲,何国琦,等. 北山地区早古生代板块构造特征[J]. 地质科学,1990(4):305-314.ZUO Guozhao, ZHANG Shuling, HE Guoqi, et al. Early Paleozoic plate tectonics in Beishan Area[J]. Scientia Geologica Sinica, 1990(4): 305-314(in Chinese).
    [2] 李锦轶,肖序常. 对新疆地壳结构与构造演化几个问题的简要评述[J]. 地质科学,1999,34(4):405-419.LI Jinyi, XIAO Xuchang. Brief reviews on some issues of framework and tectonic evolution of Xinjiang crust[J]. Scientia Geologica Sinica, 1999, 34(4): 405-419(in Chinese).
    [3] 童英. 阿尔泰造山带晚古生代花岗岩年代学成因及其地质意义[D]. 北京:中国地质科学院,2006.
    [4] CARTER A, ROQUES D, BRISTOW C S. Denudation history of onshore central Vietnam: Constraints on the Cenozoic evolution of the western margin of the South China Sea[J]. Tectonophysics, 2000, 322: 265-277.
    [5] KOHN B P, GLEADOW A J W, BROWN R W, et al. Visualizing thermotectonic and denudation histories using apatite fission track thermochronology[J]. Reviews in Mineralogy and Geochemistry, 2005, 58: 567-588.
    [6] 李天德,波里扬斯基B H. 中国和哈萨克斯坦阿尔泰大地构造及地壳演化[J]. 新疆地质,2001,19(1):27-33. LI Tiande, POLIYANGSIJI B H. Tectonics and crustal evolution of Altai in China and Kazakhstan[J]. Xinjiang Geology, 2001, 19(1): 27-33(in Chinese).
    [7] 成守德,王元龙. 新疆大地构造演化基本特征[J]. 新疆地质,1998,16(2):97-106.CHENG Shoude, WANG Yuanlong. Basic characteristics of geotectonic evolution of Xinjiang[J]. Xinjiang Geology, 1998, 16(2): 97-106(in Chinese).
    [8] 袁万明,董金泉,保增宽,等. 新疆阿尔泰造山带构造作用的锆石裂变径迹分析[J]. 地学前缘,2005,26(增刊):239-243.YUAN Wanming, DONG Jinquan, BAO Zengkuan, et al. Fission track evidences for tectonic activity in Altay Mountains, Xinjiang, North-Western China[J]. Earth Science Frontiers, 2005, 26(Suppl.): 239-243(in Chinese).
    [9] 李江风. 新疆近40年来的冬春气温变化和环流特征[J]. 干旱区地理,1991,14(4):36-41.LI Jiangfeng. Change of temperature and circulation characteristics in winter and spring for the recent 40-years in Xinjiang[J]. Arid Land Geography, 1991, 14(4): 36-41(in Chinese).
    [10] 祁志明,李天德. 中国和哈萨克斯坦阿尔泰有色金属成矿带的划分和对比[J]. 有色金属矿产与勘查,1996,5(5):265-272.QI Zhiming, LI Tiande. The division of nonferrous metallogenetic belts of Altay in China and Kazakhstan and comparison between these tow regions[J]. Geological Exploration for Non-ferrous Metals, 1996, 5(5): 265-272(in Chinese).
    [11] BELLEMANS F, de CORTE F, van DENHAUTE P. Composition of SRM and CN U-doped glasses: Significance for their use as thermal neutron influence monitors in fission track dating[J]. Radiation Measurements, 1994, 24(2): 153-160.
    [12] GLEADOW A J W, DUDDY I R, GREEN P F, et al. Confined fission track lengths in apatite: A diagnostic tool for thermal history analysis[J]. Contributions to Mineralogy and Petrology, 1986, 94(4): 405-415.
    [13] GREEN P F. On the thermo-tectonic evolution of Northern England: Evidence from fission track analysis[J]. Geology, 1986, 5: 493-506.
    [14] HURFORD A J. Standardization of fission track dating-calibration: Recommendation by the fission track working group of the IUGS, sub-commission on geochronology[J]. Chem Geol, 1990, 80: 171-178.
    [15] BRANDON M T. Decomposition of fission-track grain-age distributions[J]. Radiation Measurements, 1992, 292: 535-564.
    [16] BRANDON M T. Probability density plots for fission-track grain age distribution[J]. Radiation Measurements, 1996, 296: 663-676.
    [17] 吴堑虹,刘顺生,JONCKHEERE R. 东大别地区磷灰石裂变径迹年龄的构造意义初析[J]. 地质科学,2002,37(3):36-41.WU Qianhong, LIU Shunsheng, JONCKHEERE R. Primary analysis on tectonic implication of apatite fission track ages from Eastern Dabie Area, China[J]. Scientia Geologica Sinica, 2002, 37(3): 36-41(in Chinese).
    [18] 杨牧,彭省临,杨斌,等. 新疆北部壳体大地构造演化与运动初步研究[J]. 大地构造与成矿学,2005,29(1):113-121.YANG Mu, PENG Shenglin, YANG Bin, et al. Crust body’s movement and evolution in Northern Xinjiang[J]. Geotectonica Et Metallogenia, 2005, 29(1): 113-121(in Chinese).
    [19] 袁万明,王世成,李胜荣,等. 西藏冈底斯带构造活动的裂变径迹证据[J]. 科学通报,2001,46(20):1739-1742.
    [20] KETCHAM R A, DONELICK R A, CARLSON W D. Variability of apatite fission-track annealing kinetics Ⅲ: Extrapolation to geological time scales[J]. American Mineralogist, 1999, 84: 1235-1255.
    [21] ZEITLER P K, TAHIRKHELI R A K, NAESER C W, et al. Unroofing history of a suture zone in the Himalaya of Pakistan by means of fission-track annealing ages[J]. Earth Planetary Sci Lett, 1982, 57: 227-240.
    [22] WAGNER G A, van den HAUTE P. Fission-track dating[M]. Dordrecht: Kluwer Academic Publisher, 1992.
    [23] YUAN W M, YANG Z Q, ZHANG Z C. The uplifting and denudation of main Huangshan Mountains, Anhui Province, China[J]. Sci China Earth Sci, 2011, 54(8): 1168-1176.
    [24] HAY W W, SHAW C A, WOLD C N. Mass-balanced paleogeographic reconstruction[J]. Geologische Rundschau, 1989, 78: 207-242.
    [25] METIVER F, GAUDEMER Y. Mass transfer between eastern Tianshan and adjacent basins (Central Asia): Constraints on regional tectonics and topography[J]. Geophysical Journal International, 1997, 128: 1-17.
    [26] 丁汝鑫. 大别造山带晚白垩世以来的剥露作用及古地形再造[D]. 上海:同济大学,2007.
    [27] 贾振远,杨家,李志明,等. 中国古大陆及其边缘早古生代层序地层及海平面变化的基本特征[J]. 地球科学——中国地质大学学报,1997,22(5):544-551.JIA Zhenyuan, YANG Jia, LI Zhiming, et al. Sedimentary stratigraphy and sea level changes on Early Paleozoic paleocontinents and their margins in China[J]. Earth Science—Journal of China University of Geosciences, 1997, 22(5): 544-551(in Chinese).
    [28] 赵文金. 西藏岗巴晚白垩世有孔虫动物群与海平面变化[J]. 高校地质学报,2001,7(1):106-114.ZHAO Wenjin. Late Cretaceous foraminiferal faunas and eustatic change in Gamba Area, Southern Tibet[J]. Geological Journal of China Universities, 2001, 7(1): 106-114(in Chinese).
    [29] 万晓樵. 从有孔虫分析西藏南部白垩世海平面升降[J]. 现代地质,1992,6(4):392-398.WAN Xiaoqiao. Cretaceous foraminifera from Southern Xizang (Tibet): A study on eustatic change[J]. Geoscience, 1992, 6(4): 392-398(in Chinese).
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  • 刊出日期:  2013-08-19

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