唐河—栗园—泌阳断层的几何学和运动学特征——兼论桐柏造山带与泌阳凹陷的盆—山关系  

Geometry and kinematics of the Tanghe‑Liyuan‑Biyang fault and its implication on the relationship between Tongbai orogenic belt and Biyang Depression

作　　者：李智 张志业 何登发[1] 李岩[2] 黎腾[2] 熊健 王雪梅[2] 王雷[2] 应森群 Li Zhi;Zhang Zhiye;He Dengfa;Li Yan;Li Teng;Xiong Jian;Wang Xuemei;Wang Lei;Ying Senqun(School of Energy Resources,China University of Geosciences,Beijing 100083;SINOPEC Henan Oilfield Company,Nanyang,Henan 473400)

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]中石化河南油田分公司,河南南阳473400

出　　处：《地质科学》2020年第3期921-938,共18页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家科技重大专项(编号:2017ZX05001-001);国家重点研发计划项目(编号:2017YFC0601405-03)资助。

摘　　要：唐河—栗园—泌阳断层位于南襄盆地泌阳凹陷南部,是分隔泌阳凹陷与桐柏造山带的伸展拆离型控凹边界断裂,其几何学和运动学特征对分析泌阳凹陷的形成演化过程和研究泌阳凹陷与桐柏造山带的盆—山关系均具有重要意义。本文以区域露头、岩石测年、地震、钻井分层资料为基础,精细刻画断层的几何学特征,恢复其运动学过程并探讨泌阳凹陷与桐柏造山带的盆—山关系。根据断层走向、倾向和距离—位移曲线,将断层分为西段、中段、东1段和东2段,各段的断面形态、滑脱深度、沉积地层均有差异;认为断层是一个复杂曲面,可由3个横向轴面和3个纵向轴面分割为15个等倾角区。根据演化复原,认为断层西段在晚白垩世开始活动,中段在玉二段沉积期开始活动,东1段在玉一段沉积期开始活动,东2段在大仓房组沉积期开始活动,整体呈现由西向东逐渐活化扩展的趋势。断面及上盘地层旋转程度在中段最大,向两侧减弱;后期隆升剥蚀强度在中段最弱,东段次之,西段最强。前晚白垩世,泌阳凹陷基底与桐柏造山带经历了相似的构造演化过程;晚白垩世—始新世,泌阳凹陷扬子板块向华北板块俯冲碰撞后岩石圈拆沉的地幔热流作用,早期NW-SE向逆冲断裂反转沉降形成凹陷雏形,盆—山关系具耦合特征;渐新世以来,受太平洋板块向欧亚大陆俯冲碰撞的弧后拉张作用,凹陷沉降—沉积逐渐受NE-SW向断裂控制,盆—山关系具脱耦特征。Tanghe-Liyuan-Biyang fault is located in the south of Biyang Depression,Nanxiang Basin,which is an extensional detachment-controlled depression fault separating Biyang Depression and Tongbai Mountain.Its geometric and kinematic characteristics are of great significance to the analysis of the formation and evolution of Biyang Depression and the study of the basin-mountain relationship between Biyang Depression and Tongbai Mountain.Based on the regional outcrop,geochemical data,seismic and drilling data,this paper describes the three-dimensional geometric characteristics of the boundary fault,recovers its kinematic process and discusses the basin-mountain relationship between Biyang Depression and Tongbai Mountain.According to the trend and distance-displacement curve of the fault,it is divided into four sections,i.e.West,Middle,East 1 and East 2.The section shape,detachment depth and sedimentary strata of each section are different.In space,the boundary fault is a complex curved surface composed of 15 equal dip angle areas.According to the results of evolution restoration,it is considered that the western segment active in the Late Cretaceous,the middle segment active in the sedimentary period of lower Yuhuangding Formation,the eastern 1 started to move in the sedimentary period of Upper Yuhuangding Formation,and the eastern 2 started to move in the sedimentary period of Dachanfang Formation.The fault as a whole showed a trend of gradual activation and expansion from west to east.The rotation degree of fault and hanging wall strata is largest in the middle section,and decreases to both sides;the reverse erosion intensity is the smallest in the middle section,followed by the east section,and the largest in the west section.In the Pre-Cretaceous,the basement of Biyang Depression and Tongbai Mountain experienced similar tectonic evolution.During the Late Cretaceous-Eocene,the Biyang Depression was subjected to mantle heat flow caused by lithospheric delamination after subduction and collision of the Yangtze Plate and

关 键 词：泌阳凹陷 桐柏造山带 边界断层 几何学 运动学 盆山关系 

分 类 号：P542[天文地球—构造地质学]