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Apatite Fission Track Analyses of Exhumation History and Antiquated Topography Reconstruction in the Southern Margin of Altai, Xinjiang
Author(s): SONG Gao, YUAN Wanming, ZHAO Wenju, LIU Haitao
Pages: 967-
978
Year: 2013
Issue:
7
Journal: Acta Geologica Sinica
Keyword: heat history; uplift and exhumation; fassion track; apatite; Altai;
Abstract: 本文应用裂变径迹技术对阿尔泰地区13个磷灰石裂变径迹样品进行分析研究,揭示了该地区的隆升剥露历史,并进行了古地形再造.热历史演化模式具有3个阶段的特征:①约120~80 Ma至70 Ma,温度较高,处于磷灰石裂变径迹退火带底部温度,主体高于100℃,晚白垩世末期和早第三纪初期,阿尔泰地区构造运动不明显,仅有微弱的升降运动,均夷作用显著;②从80~70 Ma至30~20 Ma,快速冷却,温度由85~75℃降至35~30℃,晚第三纪,自中新世起,特别是中新世中晚期,由于喜马拉雅运动的影响,块断升降运动较为加强,山区上升,盆地相对下降;③从约30~20 Ma至现今,缓慢冷却,温度由35~30℃降为现在的地表温度(平均20℃).三阶段隆升速率分别为0.025 mm/a,0.027 mm/a和0.02 mm/a;隆升幅度分别为1.14 km,1.34 km和0.43 km.地表隆升幅度变化于634~2394m之间.区内平均剥蚀量为2168m,平均隆升量3318m,二者之差1150 m便是现在的平均高程.
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