Late Quaternary thrusting in the southern margin of the Chaiwopu Basin, northern Chinese Tian Shan foreland

Pang Lichen; Cheng Lu; Lu Honghua; Guan Xue; Wu Dengyun; Zheng Xiangmin

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Late Quaternary thrusting in the southern margin of the Chaiwopu Basin, northern Chinese Tian Shan foreland

机译：泰山北部泰山盆地南部边缘的晚期季度推动

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Thrusting and the associated folding are crucial geological processes accommodating the crustal shortening in a foreland setting. This work focuses on the late Quaternary thrusting of the Banfanggou fault (BF) in the southern Chaiwopu Basin, northern Chinese Tian Shan foreland. The outcrops at the Urumqi River in the western part of the southern margin of the basin show that the BF, dipping south with angle of 60-80 degrees, has thrust the Neogene mudstone onto the Quaternary gravels and has displaced the terrace surfaces. In contrast, the eastern segment of the BF exists as a blind thrust fault. By using the geomorphic surface (river terrace and alluvial fan) as the reference, the average rate of vertical slip on the western segment of the BF over the past similar to 12 ka is estimated to similar to 1.7 mm/year, and the estimated rate at the eastern segment of the fault is similar to 1.0-1.3 mm/year. Despite of the uncertainties of the rates deriving from the vertical offsets and the geomorphic ages, the resultant vertical slip rates might imply relatively high seismic risk in the southern Chaiwopu Basin.

机译：逆冲作用和相关褶皱是适应前陆环境中地壳缩短的关键地质过程。本文研究了天山前陆柴窝堡盆地南部板房沟断裂晚第四纪逆冲作用。盆地南缘西部乌鲁木齐河的露头表明，BF以60-80度的角度向南倾斜，将新近纪泥岩推到第四纪砾石上，并使阶地表面发生位移。相比之下，BF东段作为一个盲逆冲断层存在。以地貌面（河流阶地和冲积扇）为参考，BF西段过去类似于12ka的平均垂直滑动速率估计为1.7mm/年，断层东段的估计速率为1.0-1.3mm/年。尽管垂直偏移和地貌年龄产生的速率存在不确定性，但由此产生的垂直滑动速率可能意味着柴窝堡盆地南部的地震风险相对较高。

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来源
《Terra Nova》 |2021年第2期|共9页
作者
Pang Lichen; Cheng Lu; Lu Honghua; Guan Xue; Wu Dengyun; Zheng Xiangmin;
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作者单位

East China Normal Univ Sch Geog Sci Minist Educ Key Lab Geog Informat Sci Shanghai Peoples R China;

East China Normal Univ Sch Geog Sci Minist Educ Key Lab Geog Informat Sci Shanghai Peoples R China;

East China Normal Univ Sch Geog Sci Minist Educ Key Lab Geog Informat Sci Shanghai Peoples R China;

East China Normal Univ Sch Geog Sci Minist Educ Key Lab Geog Informat Sci Shanghai Peoples R China;

China Earthquake Adm Inst Geol Beijing Peoples R China;

East China Normal Univ Sch Geog Sci Minist Educ Key Lab Geog Informat Sci Shanghai Peoples R China;

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原文格式 PDF
正文语种 eng
中图分类天文学、地球科学;
关键词
Late Quaternary; slip rate; the Banfanggou fault; the Chaiwopu Basin; the Tian Shan;

机译：迟到的第四纪;滑率;班坊沟故障;柴沃府盆地;天山;

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Late Quaternary thrusting in the southern margin of the Chaiwopu Basin, northern Chinese Tian Shan foreland

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