博—阿断裂带中东段晚第四纪以来滑动速率
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摘要
通过对新疆博—阿断裂带中东段的实地调查,发现断裂在吐鲁番盆地西南山前冲洪积扇上形成了冲沟右旋错动、断层陡坎、挤压隆起等与断裂活动相关的典型断错地貌。对比区域地貌面的分布和年龄,并结合测年结果,认为研究区内主要分布了3期冲洪积扇,并对应3级河流阶地。实测Fan3冲洪积扇上冲沟的最大右旋位错达40.8 m,其余分布在22～27 m区间内,Fan2冲洪积扇上冲沟的右旋位错达26.5 m,结合光释光年代样品的测试结果,得到1.8万年以来断裂平均右旋走滑速率为(1.42±0.18)mm/a。
The Bolokenu-Aqikekuduke fault is a large right-lateral strike-slip fault. There are many geomorphic features related to fault activities in southwest of Turpan basin, such as gully right lateral displacement, fault scarp, pressure ridge.Though field geomorphology investigation,it has been found that three periods of alluvial-pluvial fans are distributed in front of Jueluotage mountain. The largest right-lateral displacement is about 40.8 m on the Fan3 alluvial-pluvial fan, majority of the values is between 22～27 m, the right-lateral displacement is about 26.5 m on the Fan2 alluvial-pluvial fan, taking the results from the OSL dating,it concludes that the minimum right-lateral slip rate is(1.42±0.18) mm/a since 18 ka BP.
The Bolokenu-Aqikekuduke fault is a large right-lateral strike-slip fault. There are many geomorphic features related to fault activities in southwest of Turpan basin, such as gully right lateral displacement, fault scarp, pressure ridge.Though field geomorphology investigation,it has been found that three periods of alluvial-pluvial fans are distributed in front of Jueluotage mountain. The largest right-lateral displacement is about 40.8 m on the Fan3 alluvial-pluvial fan, majority of the values is between 22～27 m, the right-lateral displacement is about 26.5 m on the Fan2 alluvial-pluvial fan, taking the results from the OSL dating,it concludes that the minimum right-lateral slip rate is(1.42±0.18) mm/a since 18 ka BP.
引文
[1] 杨晓平,沈军.天山内部博罗可努断裂精河一阿拉山口段晚更新世以来的活动特征[J].地震地质,2000,22(3):305-315.
[2] Molnar, P.Brown .E.T.,Buchfiel.B .C,et al.Quaternary Climate Change And The Formation Of River Terraces Across Growing Anticlines On The North Flank Of The Tianshan,China[J].The Geology,1994,102:583-602.
[3] 沈军,杨晓平.博罗可努断裂带西北段古地震形变带的初步研究[J].内陆地震,1998,12(3): 248-257.
[4] Campbell,G. E. , R. T. Walker, K. Abdrakhmatov et al .The Dzhungarian Fault: Late Quaternary Tectonics And Slip Rate Of A Major Right-Lateral Strike-Slip Fault In The Northern TianShan Region[J].Journal of Geophysical Research,2013,118:5 681-5 698.
[5] Rockwell, T., Keller, E., Dembroff, G. Quaternary Rate Of Folding Of The Ventura Avenue Anticline, Western Transverse Ranges, Southern California[J]. Geological Society of America Bulletin, 1988,100:850-858.
[6] 潘家伟,李海兵.西昆仑山前冲断带晚新生代构造地貌特征[J].地质通报,2007,26(10):138-149.
[7] 李跃华,吴中海,叶培盛,等.玉树断裂带左旋走滑活动标志及其几何学与运动学特征[J].地质通报,2013,32(9):1 410-1 422.
[8] 付碧宏,张松林. 阿尔金断裂系西段—康西瓦断裂的晚第四纪构造地貌特征研究[J].第四纪研究,2006,26(2):229-235
[9] 云龙,杨晓平.青藏高原北缘三危山断裂晚第四纪以来的左旋走滑活动[J].地震地质,2016,38(2):434-446.
[10] 邓起东,冯先岳,张培震,等.天山活动构造[M].北京:地震出版社,2002:20-320.
[2] Molnar, P.Brown .E.T.,Buchfiel.B .C,et al.Quaternary Climate Change And The Formation Of River Terraces Across Growing Anticlines On The North Flank Of The Tianshan,China[J].The Geology,1994,102:583-602.
[3] 沈军,杨晓平.博罗可努断裂带西北段古地震形变带的初步研究[J].内陆地震,1998,12(3): 248-257.
[4] Campbell,G. E. , R. T. Walker, K. Abdrakhmatov et al .The Dzhungarian Fault: Late Quaternary Tectonics And Slip Rate Of A Major Right-Lateral Strike-Slip Fault In The Northern TianShan Region[J].Journal of Geophysical Research,2013,118:5 681-5 698.
[5] Rockwell, T., Keller, E., Dembroff, G. Quaternary Rate Of Folding Of The Ventura Avenue Anticline, Western Transverse Ranges, Southern California[J]. Geological Society of America Bulletin, 1988,100:850-858.
[6] 潘家伟,李海兵.西昆仑山前冲断带晚新生代构造地貌特征[J].地质通报,2007,26(10):138-149.
[7] 李跃华,吴中海,叶培盛,等.玉树断裂带左旋走滑活动标志及其几何学与运动学特征[J].地质通报,2013,32(9):1 410-1 422.
[8] 付碧宏,张松林. 阿尔金断裂系西段—康西瓦断裂的晚第四纪构造地貌特征研究[J].第四纪研究,2006,26(2):229-235
[9] 云龙,杨晓平.青藏高原北缘三危山断裂晚第四纪以来的左旋走滑活动[J].地震地质,2016,38(2):434-446.
[10] 邓起东,冯先岳,张培震,等.天山活动构造[M].北京:地震出版社,2002:20-320.