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滇西北永胜地区主要活动断裂与活动构造体系

黄小龙 吴中海 吴坤罡 周春景

黄小龙, 吴中海, 吴坤罡, 等, 2016. 滇西北永胜地区主要活动断裂与活动构造体系. 地质力学学报, 22 (3): 531-547.
引用本文: 黄小龙, 吴中海, 吴坤罡, 等, 2016. 滇西北永胜地区主要活动断裂与活动构造体系. 地质力学学报, 22 (3): 531-547.
HUANG Xiao-long, WU Zhong-hai, WU Kun-gang, et al., 2016. THE MAIN ACTIVE FAULTS AND TECTONIC SYSTEM IN YONGSHENG AREA, NORTHWESTERN YUNNAN. Journal of Geomechanics, 22 (3): 531-547.
Citation: HUANG Xiao-long, WU Zhong-hai, WU Kun-gang, et al., 2016. THE MAIN ACTIVE FAULTS AND TECTONIC SYSTEM IN YONGSHENG AREA, NORTHWESTERN YUNNAN. Journal of Geomechanics, 22 (3): 531-547.

滇西北永胜地区主要活动断裂与活动构造体系

基金项目: 

中国地质调查局地质调查项目 12120114002101

中国地质调查局地质调查项目 121201104000150010

详细信息
    作者简介:

    黄小龙(1989-), 男, 博士研究生, 从事新构造与地震地质研究。E-mail:tinyloong@163.com

  • 中图分类号: P546

THE MAIN ACTIVE FAULTS AND TECTONIC SYSTEM IN YONGSHENG AREA, NORTHWESTERN YUNNAN

  • 摘要: 位于滇西北断陷带东北部、程海-宾川断裂带北端的永胜地区上新世以来断裂活动强烈,构造地貌特征显著。永胜地区1:50000活动构造填图发现,区内共存在各类断裂14条。其中金官断裂(F1)、永胜断裂(F2)、木耳坪羊坪断裂(F3)三者规模最大,活动性亦远超其他断裂,属于程海-宾川断裂带的一级分支断裂,其他断裂为程海-宾川断裂的二级分支断裂。构造地貌特征、错断地质体及擦痕统计等均指示区内断裂现今主要以伸展正断活动为主,根据活动性的差异可将其分为强、较强、中等、弱、极弱5类,其中金官断裂的活动性最强,垂向活动速率可达0.20~0.26 mm/a。对永胜地区主要断裂几何学、运动学特征的研究及动力学机制的讨论可知,永胜地区主要断裂在平面上构成向东突出的弧形旋扭构造体系,在剖面上表现为张扭性断裂常见的负花状构造;程海-宾川断裂带现今活动主要是在近南北向主压应力作用下产生的近东西向的伸展正断,并因为叠加了旋扭作用而具有一定左旋走滑。永胜地区的弧形旋扭构造体系及滇西北断陷带等均是在川滇内弧带顺时针旋转及南汀河断裂、畹町断裂与理塘断裂的走滑拉分共同作用下形成的。

     

  • 图  1  滇西北区域活动构造简图[3]

    Figure  1.  Regional active structure schematic of northwest Yunnan

    图  2  永胜地区主要活动断裂分布及地形剖面图

    F1—金官断裂;F2—永胜断裂;F3—木耳坪羊坪断裂;F4—永胜盆地西缘断裂;F5—胡家村断裂; F6—杨家村断裂;F7—东岩子断裂;F8—梅家湾断裂;F9—洪水荡断裂;F10—凉水村断裂; F11—小甸尾断裂;F12—新营村断裂;F13—五里箐断裂;F14—羊坪水库断裂

    Figure  2.  Major active faults and topographic profile of Yongsheng area

    图  3  金官断裂及其次级断裂的地表证据

    a—金官断裂上的断崖及古地震滑坡(镜像北);b—灰岩地层中发育的断层面及断层崖(镜像北东,黄色箭头标注的为断面位置);c—被金官断裂错断的古地震滑坡体(镜像北东);d—沿金官断裂南段发育的断层崖(镜像北东);e—杨家村断裂控制的断层三角面(镜像南东);f—东岩子断裂上发育的断层破碎带(镜像南西);g—被梅家湾断层错断的上新世地层(镜像东);h—洪水荡微型断陷盆地及三刀山地貌(镜像南东)

    Figure  3.  The field evidences of Jinguan fault and its secondary faults

    图  4  永胜地区地质及地质剖面图

    Figure  4.  Geological and geological profile map of Yongsheng area with major active faults

    图  5  永胜断裂、木耳坪-羊坪断裂及其次级断裂的地表证据

    a—永胜盆地东侧线性的断层三角面(镜像南东东);b—方家村东侧断层出露面上的擦痕;c—南山店东侧被错断的阶地(镜像南);d—木耳坪盆地东侧线性的断层地貌及古地震滑坡体(镜像北);e—木耳坪—羊坪断裂上出露的断面(镜像北);f—断面上的擦痕

    Figure  5.  The field evidences of Yongsheng fault, Muerping-Yangping fault and their secondary faults

    图  6  永胜地区活动断裂弧形旋扭构造体系图

    Figure  6.  The active fault arc rotating structure system in Yongsheng area

    图  7  弧形旋扭构造体系成因模式图

    Ⅰ—川滇外弧带,Ⅰ-1—玉树-鲜水河-小江-奠边府弧形构造边界带;Ⅰ-2—雅江-楚雄-景洪断块区;Ⅱ—川滇内弧带;Ⅱ-1—理塘-大理-瑞丽弧形构造边界带;Ⅱ-2—德钦-保山断块区

    Figure  7.  Genetic model of arc rotating structure system

    表  1  永胜地区主要活动断裂及其活动性

    Table  1.   Main active faults in Yongsheng area and their activity

    断层名称断裂编号产状长度/km性质垂向位移量/m活动速率/(mm·a-1)活动性分级
    倾向倾角/(°)
    金官断裂  F1W—SW6025正断1000~13000.20~0.26
    永胜断裂  F2W—SW5435正断800~8500.16~0.17较强
    木耳坪—羊坪断裂  F3W—SW4130正断500~6000.10~0.12中等
    金官盆地西缘断裂  F4E—NE--正断--极弱
    胡家村断裂  F5W-7正断600.012
    杨家村断裂  F6-1W675正断1500.03
      F6-2E-1.3正断--极弱
    东岩子断裂  F7-1W-5正断2000.04
      F7-2E-2.5正断--极弱
    梅家湾断裂  F8-1W-4.5正断2200.044
      F8-2E654正断--极弱
    洪水荡断裂  F9W-2正断--极弱
    凉水村断裂  F10E--正断--极弱
    小甸尾断裂  F11W--正断--极弱
    新营村断裂  F12-1SE-2.5正断>60>0.012
      F12-2NW-2正断--极弱
    五里箐断裂  F13W-8正断2000.04
    羊坪水库断裂  F14-1W--正断--极弱
      F14-2E-3正断--
    下载: 导出CSV
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