西北地质
西北地質
서북지질
NORTHWESTERN GEOLOGY
2014年
2期
138-145
,共8页
前陆盆地%沉降动力%盆山耦合%物质交换
前陸盆地%沉降動力%盆山耦閤%物質交換
전륙분지%침강동력%분산우합%물질교환
foreland basins%subsidence dynamics%coupling%mass exchange
前陆盆地为汇聚板块边界的典型盆地代表,其沉降的动力机制主要有构造挠曲、俯冲动力以及各种重力负载。其盆山耦合可观测的表现是各种镜像或对应关系,包括造山带隆起与盆地沉降,造山带推进与前陆盆地迁移,造山作用终止与盆地消亡,幕式、韵律性的表浅层物质转移等,其根源是汇聚板块统一的区域地球动力学及运动学过程。盆山耦合过程中物质交换在表浅层完成从山到盆以碎屑物质为主的转移,在中深层表现为各种脆性断层及方式不一、方向各异的复杂的韧性流变。盆地与造山带是统一区域动力作用的不同产物,二者在形成、演化过程中表现出复杂的相互直接作用或间接影响。
前陸盆地為彙聚闆塊邊界的典型盆地代錶,其沉降的動力機製主要有構造撓麯、俯遲動力以及各種重力負載。其盆山耦閤可觀測的錶現是各種鏡像或對應關繫,包括造山帶隆起與盆地沉降,造山帶推進與前陸盆地遷移,造山作用終止與盆地消亡,幕式、韻律性的錶淺層物質轉移等,其根源是彙聚闆塊統一的區域地毬動力學及運動學過程。盆山耦閤過程中物質交換在錶淺層完成從山到盆以碎屑物質為主的轉移,在中深層錶現為各種脆性斷層及方式不一、方嚮各異的複雜的韌性流變。盆地與造山帶是統一區域動力作用的不同產物,二者在形成、縯化過程中錶現齣複雜的相互直接作用或間接影響。
전륙분지위회취판괴변계적전형분지대표,기침강적동력궤제주요유구조뇨곡、부충동력이급각충중력부재。기분산우합가관측적표현시각충경상혹대응관계,포괄조산대륭기여분지침강,조산대추진여전륙분지천이,조산작용종지여분지소망,막식、운률성적표천층물질전이등,기근원시회취판괴통일적구역지구동역학급운동학과정。분산우합과정중물질교환재표천층완성종산도분이쇄설물질위주적전이,재중심층표현위각충취성단층급방식불일、방향각이적복잡적인성류변。분지여조산대시통일구역동력작용적불동산물,이자재형성、연화과정중표현출복잡적상호직접작용혹간접영향。
As typical representatives of convergent-type basins,foreland basins subside due to compressive flexural tectonics and,dynamic subducted slabs,as well as various gravitational loads.Events observed in foreland-thrust coupling are corresponding or symmetrical phenomena phenomenon such as orogen rising and basin subsiding,orogen advancing and basin migrating, orogeny ending and basin overfilling,and rhythmic/or cyclic transfusion transfer etc..Dominated radically by entire dynamics and kinematics in convergence belts,mass exchange during foreland-thrust coupling are represented by clast transfusion transfer from orogen to basin and brittle faults in superficial layers,and heterogeneous ductile flow of multimode and multidirection in deep layers.Both foreland basins and adjacent orogens are resulted from the entire regional dynamics with complicated direct or indirect interactions.