西秦岭北缘漳县地区上新统砾岩构造节理特征及构造应力场分析
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摘要
利用共轭节理反演构造应力场是构造应力场分析的有效方法.西秦岭北缘漳县地区上新统砾岩发育有南北向、近东西向、北东向、北西向共四组构造节理.利用吴氏网投影技术对二十组共轭节理数据进行分析,其中北东向和北西向两组节理构成第一期共轭节理,而南北向和近东西向两组节理构成第二期共轭节理.其最大主应力方向分别为近S-N向和NNE-SSW向,这反映了该区域上新统砾岩构造节理的形成先后经历了近南北向和北北东向两期构造应力场作用.
Utilizing conjugate joints to inverse tectonic stress field is an effective method of tectonic stress field analysis.Based on the structural study of Hanjigou Pliocene conglomerate in Zhangxian area, the northern margin of the West Qinling,the study indicates that four sets of structural joints are developed in this conglomerates. The strikes of those four sets of structural joints are SN, EW, NE and NW respectively. We use twenty conjugate joints to inverse the tectonic stress fields by stereographic projection technique. NE and NW joints, SN and EW joints, are respectively formed in first and second stages of conjugate joints. The maximum principal compression stress directions are nearly S-N and NNE-SSW striking respectively.The study indicates that the formation of the conjugate joints of Pliocene conglomerate is affected from two stages tectonic stress field of nearly S-N and NNE-SSW striking successively and respectively.
Utilizing conjugate joints to inverse tectonic stress field is an effective method of tectonic stress field analysis.Based on the structural study of Hanjigou Pliocene conglomerate in Zhangxian area, the northern margin of the West Qinling,the study indicates that four sets of structural joints are developed in this conglomerates. The strikes of those four sets of structural joints are SN, EW, NE and NW respectively. We use twenty conjugate joints to inverse the tectonic stress fields by stereographic projection technique. NE and NW joints, SN and EW joints, are respectively formed in first and second stages of conjugate joints. The maximum principal compression stress directions are nearly S-N and NNE-SSW striking respectively.The study indicates that the formation of the conjugate joints of Pliocene conglomerate is affected from two stages tectonic stress field of nearly S-N and NNE-SSW striking successively and respectively.
引文
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[3]袁道阳,杨明.西秦岭北缘断裂带的位移累计滑动亏损特征及其破裂分段性研究[J].地震研究,1999,22(4):382-389.
[4]邵延秀,袁道阳,王爱国,等.西秦岭北缘断裂破裂分段与地震危险性评估[J].地震地质,2011,33(1):79-90.
[5]郭进京,韩文峰,赵海涛,等.西秦岭北缘漳县中-新生代红层地层格架厘定及其地质意义[J].西北地质,2016,49(1):82-91.
[6]郭进京,韩文峰,胡晓隆,等.西秦岭北缘漳县新生代伸展断陷盆地确定及其地质意义[J].地学前缘,2017,24(5):230-244.
[7]马春田,郭进京,刘林,等.西秦岭北缘漳县含盐红层盆地构造分析及古构造应力场反演[J].大地测量与地球动力学,2015,35(2):273-277.
[8]任收麦,葛肖虹,刘永江,等.柴达木盆地北缘晚中生代-新生代构造应力场——来自构造节理分析的证据[J].地质通报,2009,28(7):877-887.
[9]林逸,张长厚,李程明,等.基于断层滑动矢量反演的燕山中段中侏罗世-早白垩世构造应力场序列[J].大地构造与成矿学,2015,39(2):187-207.
[10]陈鹏,施炜,杨家喜,等.天水盆地晚新生代构造演化——对青藏高原北东向扩展的指示意义[J].大地构造与成矿学,2016,40(2):308-322.
[11]韩效忠,刘权,林建平,等.浙江新路火山岩盆地构造应力场及其对铀成矿的控制[J].大地构造与成矿学,2016,40(6):1107-1122.
[12]关宝文,郑建京,赵恒,等.博格达山地区二叠纪以来构造应力场解析及地质意义[J].大地构造与成矿学,2017,41(1):42-49.
[13]李四光.地质力学概论[M].北京:科学出版社,1973.
[14] ZHENG Yadong,WANG Tao,MA Mingbo,et al. Maximum effective moment criterion and the origin of low-angle normal faults[J]. Journal of Structure Geology,2004,26:271-285.
[15]陈鹏,施炜.古构造应力场反演的理论与实践——基于断层滑动矢量分析[J].地质论评,2015,61(3):536-546.
[16]何绍勋.构造地质学中的赤平投影技术[M].北京:地质出版社,1979.