柯坪塔格山前层状地貌面与晚第四纪逆断层变形——以三岔口北西山前断错地貌为例

doi:10.3969/j.issn.0253-4967.2011.04.004

摘要/Abstract

摘要：

柯坪塔格山前三岔口北西发育了5级不同期次的冲洪积扇面,其中较年轻的3期完整地保留了断裂最新活动形成的陡坎。依据断错地貌面上砾石混合样品的¹⁰Be暴露年龄及差分GPS地形实测结果,计算出(20.22±1.91)ka以来T₁、T₂、T₃级冲洪积扇上记录的断裂垂直滑动速率分别为(0.16±0.02)、(0.17±0.02)和(0.15±0.02)mm/a。T₄、T₅级地貌面的抬升速率为(0.51±0.05)、(0.58±0.05)mm/a,稍大于T₁、T₂、T₃冲洪积扇面的结果。柯坪塔格断裂在三岔口处出露的断层倾角为20°～40°,据此计算得到(20.22±1.91)ka以来柯坪塔格的水平缩短速率为0.19～0.58mm/a。

关键词: 柯坪塔格断裂, 断错地貌, ¹⁰Be暴露年代, 滑动速率

Abstract:

There are five different levels of alluvial fans developed at Sanchakou in the south edge of the Kalpintag Mountains.Kalpintag Fault has faulted three younger alluvial fans on which fault scarps caused by the latest fault activities are perfectly retained.To estimate the vertical slip magnitude and rates of the Kalpintag Fault during the late Quaternary,we investigated the latest evidences from the topographic and geomorphic survey of the fault scarps on the fans using differential GPS and the exposure ¹⁰Be age of amalgamated samples on the surface of abandoned fans.We estimated the cosmogenic nuclide contents accumulated during the post-depositional processes in the amalgamated samples on the fans collected from nearby active gullies.The vertical displacements of fault scarps we measured on the T₁,T₂ and T₃ alluvial fans are 0.6±0.05,1.3±0.05 and 3.0±0.05m,respectively.Based on the ¹⁰Be exposure age of each alluvial fan,we calculated the vertical slip rate on T₁,T₂,T₃ alluvial fans to be 0.15±0.02,0.16±0.02 and 0.15±0.02mm/a since(20.22±1.91)ka BP,with a corresponding crustal shortening rate of the Kalpintag Fault to be 0.18～0.44mm / a.The uplift rate since the formation of the T₄ and T₅ alluvial fans is 0.51±0.05 and 0.58±0.05mm/a,respectively,which is slightly bigger than that of T₁,T₂ and T₃ alluvial fans.

Key words: Kalpintag Fault, layered landform, ¹⁰Be exposure age, slip rate

中图分类号:

P315.2

徐良鑫, 冉勇康, 刘华国, 李安. 柯坪塔格山前层状地貌面与晚第四纪逆断层变形——以三岔口北西山前断错地貌为例[J]. 地震地质, 2011, 33(4): 777-788.

XU Liang-xin, RAN Yong-kang, LIU Hua-guo, LI An. DEFORMATION OF REVERSE FAULT AND LAYERED LANDFORM IN PIEDMONT OF KALPINTAG MOUNTAINS DURING THE LATE QUATERNARY:EXAMPLE FROM THE FAULTED LANDFORM OF NORTHWESTERN SANCHAKOU[J]. SEISMOLOGY AND GEOLOGY, 2011, 33(4): 777-788.

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