大地构造与成矿学
大地構造與成礦學
대지구조여성광학
GETECTONICA ET METALLOGENIA
2015年
4期
571-586
,共16页
安慧婷%许立青%李三忠%余珊%刘鑫%索艳慧%曹现志%赵淑娟%王鹏程%郭玲莉%戴黎明
安慧婷%許立青%李三忠%餘珊%劉鑫%索豔慧%曹現誌%趙淑娟%王鵬程%郭玲莉%戴黎明
안혜정%허립청%리삼충%여산%류흠%색염혜%조현지%조숙연%왕붕정%곽령리%대려명
太行山大断裂%太行山山前断裂%节理分析%中%新生代%应力场%转换机制
太行山大斷裂%太行山山前斷裂%節理分析%中%新生代%應力場%轉換機製
태행산대단렬%태행산산전단렬%절리분석%중%신생대%응력장%전환궤제
the Large Taihang Mountain Fault%the eastern Taihang Mountain Fault%joint analysis%Meso-Cenozoic%stress field%transition mechanism
太行山东麓NNE向断裂带，主要由太行山大断裂和太行山山前断裂组成，统称为太行山东麓断裂带。通过节理统计和野外构造观测，对太行山东麓断裂带进行了构造应力场分析，探讨其中、新生代构造应力场差异和应力场的转换机制。研究结果表明，该区自中生代以来发生了5期局部应力场的变化，其最大主压应力轴方位分别为NW向、NE向、NWW向、近SN向(NNE或NNW向)和NEE向。这5期应力场分别对应中侏罗世?早白垩世的燕山期NW-SE向挤压、古新世?始新世NE-SW向挤压、始新世?渐新世NWW向挤压、中新世?早更新世近SN向挤压以及中更新世以来NEE向挤压。区域对比表明，总体上为两大动力系统引发的应力场交替，转换机制可能为：早期挤压受太平洋板块向西俯冲到东亚安第斯型大陆边缘导致华北克拉通破坏的影响；中期受太平洋板块俯冲方向转变制约；晚期伸展则与印度和欧亚板块碰撞激发的软流圈向东的扩张效应和太平洋俯冲带跃迁式东撤的联合效应–区域性“东进西退”深部机制有关。
太行山東麓NNE嚮斷裂帶，主要由太行山大斷裂和太行山山前斷裂組成，統稱為太行山東麓斷裂帶。通過節理統計和野外構造觀測，對太行山東麓斷裂帶進行瞭構造應力場分析，探討其中、新生代構造應力場差異和應力場的轉換機製。研究結果錶明，該區自中生代以來髮生瞭5期跼部應力場的變化，其最大主壓應力軸方位分彆為NW嚮、NE嚮、NWW嚮、近SN嚮(NNE或NNW嚮)和NEE嚮。這5期應力場分彆對應中侏囉世?早白堊世的燕山期NW-SE嚮擠壓、古新世?始新世NE-SW嚮擠壓、始新世?漸新世NWW嚮擠壓、中新世?早更新世近SN嚮擠壓以及中更新世以來NEE嚮擠壓。區域對比錶明，總體上為兩大動力繫統引髮的應力場交替，轉換機製可能為：早期擠壓受太平洋闆塊嚮西俯遲到東亞安第斯型大陸邊緣導緻華北剋拉通破壞的影響；中期受太平洋闆塊俯遲方嚮轉變製約；晚期伸展則與印度和歐亞闆塊踫撞激髮的軟流圈嚮東的擴張效應和太平洋俯遲帶躍遷式東撤的聯閤效應–區域性“東進西退”深部機製有關。
태행산동록NNE향단렬대，주요유태행산대단렬화태행산산전단렬조성，통칭위태행산동록단렬대。통과절리통계화야외구조관측，대태행산동록단렬대진행료구조응력장분석，탐토기중、신생대구조응력장차이화응력장적전환궤제。연구결과표명，해구자중생대이래발생료5기국부응력장적변화，기최대주압응력축방위분별위NW향、NE향、NWW향、근SN향(NNE혹NNW향)화NEE향。저5기응력장분별대응중주라세?조백성세적연산기NW-SE향제압、고신세?시신세NE-SW향제압、시신세?점신세NWW향제압、중신세?조경신세근SN향제압이급중경신세이래NEE향제압。구역대비표명，총체상위량대동력계통인발적응력장교체，전환궤제가능위：조기제압수태평양판괴향서부충도동아안제사형대륙변연도치화북극랍통파배적영향；중기수태평양판괴부충방향전변제약；만기신전칙여인도화구아판괴팽당격발적연류권향동적확장효응화태평양부충대약천식동철적연합효응–구역성“동진서퇴”심부궤제유관。
Two important subparallel faults, namely the Large Taihang Mountain Fault and the Eastern Taihang Mountain Fault, are major faults developed in the Taihang Mountain region. To revel the differences and the transition mechanisms of Meso-Cenozoic stress fields, we studied the stress fields along the Eastern Taihang Mountain Fault Zone through combined statistics and field-based structural observations. Our results show that there are five stages of local stress fields in the area since ever Mesozoic. The directions of maximum principal stresses of the five stages are NW-directed, NE-directed, NWW-directed, NNE-NNW (near-SN)-directed, and NEE-directed, respectively. The five-stage stress fields correspond to NW-SE-directed compression in the Jurassic-Early Cretaceous-Yanshanian, NE-SW-directed compression in the Paleocene-Eocene, NWW-SEE-directed compression in the Eocene-Oligocene, near S-N-directed compression in the Pliocene-early Pleistocene, and NEE-directed compression since the middle Pleistocene, respectively. The regional dynamic correlations show that the early-stage compression may have resulted from the destruction of the North China Craton that caused by the westward subduction of the Pacific Plate to the East Asian Andean-type continental margin, and the middle-stage extension is possibly related to a direction change of subduction of the Pacific Plate, whereas the late-stage extension may have resulted from the eastward upwelling of the asthenosphere that caused by the collision of the Indian to the Eurasian plates and the eastward rollback of the Pacific subduction zone.
