地震研究

根据野外调查结果,重点阐述了维西—乔后断裂南段的活动特征。研究表明,维西—乔后断裂南段在第四纪表现出明显的活动特征,运动性质以正断层作用为主。维西—乔后断裂南段对巍山第四纪盆地有着明显的控制作用,因受其影响盆地内阶地不对称发育。箐门口、佛堂村、洗澡塘探槽揭示该断裂断错了晚更新世堆积,被错最新地层¹⁴C年龄(15 430±60)a B.P.,OSL年龄为(11.6±1.6)ka,表明其最新活动时代在晚更新世末期。洗澡塘村断层地貌清晰,西河Ⅱ级阶地上发育高2 m左右的断层陡坎。根据阶地断层陡坎高度和阶地面形成年龄估算,晚更新世以来该断裂段垂直滑动速率约为0.18～0.32 mm/a。

According to geological and geomorphic field observations,we mainly elaborate the active feature of the southern segment of Weixi-Qiaohou Fault.It is revealed that the fault is apparently active in Quaternary,behaving normal faulting primarily.The Weishan quaternary basin is apparently controlled by the fault,and the terraces in the basin have developed asymmetrically under its influence.It is documented that late Pleistocene accumulations with ¹⁴C age(1 5430±60)a B.P and OSL age(11.6±1.6)ka has been displaced by the fault,revealed by the exploratory trenches at Qingmenkou,Fotang and Xizaotang villages.Therefore,it suggests that the fault is newly active in late Pleistocene.The fault landform is clear at Xizaotang village,there is a 2 m high fault scarp on the T₂ terrace of the Xihe river.It is estimated the fault has a average vertical slip rate of 0.18～0.32 mm/a since late Pleistocene,based on displaced magnitude of the river terraces and their ages formed.

引言
1 断裂对巍山盆地的控制作用
2 探槽揭示的断层活动特征
3 结语

图1 维西—乔后断裂及邻区构造图<br/>Fig.1 Structures map of the Weixi-Qiaohou Fault and its adjacent area

图1 维西—乔后断裂及邻区构造图
Fig.1 Structures map of the Weixi-Qiaohou Fault and its adjacent area

图2 维西—乔后断裂南段构造图<br/>Fig.2 Structures map of the southern segment of Weixi-Qiaohou Fault

图2 维西—乔后断裂南段构造图
Fig.2 Structures map of the southern segment of Weixi-Qiaohou Fault

图3 巍山盆地阶地剖面图(a)A-B测线剖面;(b)C-D测线剖面; (c)E-F测线剖面(位置参见图2)
Fig.3 Terrace profiles across the Weishan basin(a)the profile of A-B measuring line;(b)the profile of C-D measuring line;(c)the profile of E-F measuring line(the location see Fig.2)

图4 箐门口探槽NW壁剖面(a)地貌部位;(b)NW向小断层;(c)探槽揭示的断层剖面;(d)探槽NW壁素描图
Fig.4 The profile of the NW wall of exploratory trench at Qingmenkou(a)topography position;(b)small faults in NW;(c)the profile revealed by exploratory trench; (d)sketch map of NW wall of exploratory trench

图5 图4剖面西15 m探槽NW壁断层剖面
Fig.5 The profile of NW wall of exploratory trench at 15 m west of the Fig.4 profile

图6 佛堂村探槽地貌与断层(a)断层槽地和断层陡坎;(b)探槽布置;(c)SE壁断层;(d)炭粒取样点;(e)NW壁断层;(f)断层擦痕<br/>Fig.6 The landforms of the exploratory trench and the fault situation at Fotang Village(a)the fault trench and fanlt scrap;(b)the layout of trench;(c)SE wall fault;(d)the sample point of carbon particle;(e)NW wall fault;(f)the fault scratch

图6 佛堂村探槽地貌与断层(a)断层槽地和断层陡坎;(b)探槽布置;(c)SE壁断层;(d)炭粒取样点;(e)NW壁断层;(f)断层擦痕
Fig.6 The landforms of the exploratory trench and the fault situation at Fotang Village(a)the fault trench and fanlt scrap;(b)the layout of trench;(c)SE wall fault;(d)the sample point of carbon particle;(e)NW wall fault;(f)the fault scratch

图7 佛堂村探槽SE壁素描图
Fig.7 The sketch map of the SE wall profile of the exploratory trench at Fotang Village

图8 洗澡塘断层地貌(a)及探槽SE壁剖面(b)(c)
Fig.8 The fault landforms(a)and the profile of exploratory trench(b)(c)at Xizaotang Village

图9 贝忙一带Ⅳ级阶地断层陡坎(a)第四纪断层;(b)断层陡坎及断塞塘地貌<br/>Fig.9 The fault scarp on terrace Ⅳ nearby Beimang Village(a)Quaternary fault;(b)the fault scarp and the landform of Duansaitang

图9 贝忙一带Ⅳ级阶地断层陡坎(a)第四纪断层;(b)断层陡坎及断塞塘地貌
Fig.9 The fault scarp on terrace Ⅳ nearby Beimang Village(a)Quaternary fault;(b)the fault scarp and the landform of Duansaitang

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备注

引言

1 断裂对巍山盆地的控制作用

2 探槽揭示的断层活动特征

3 结语

期刊信息