CAJ | 학술논문

从北部湾盆地的区域地质构造背景、几何形态、边界断裂及内部断裂特征解析，综合沉积中心迁移规律及盆内构造研究，提出北部湾盆地为右行右阶走滑拉分成因。盆地的形成和发展受控于合浦北流、信宜廉江、吴川四会和阳江河源4条深大断裂带，这4条主干断裂带构成右阶断裂格架。古近系出现的花状构造等表现出典型的张扭特征，新近系受到压扭作用改造发生挤压反转，该盆地构造演化过程与华南大陆中、新生代拉分盆地具有同期性和相似性。中生代基底中先存的深大走滑断裂带是新生代北部湾盆地形成的先决地质条件。而印度澳大利亚板块对欧亚板块碰撞挤压作用的逐渐增强和太平洋板块俯冲方向的改变及俯冲作用的衰减是控制北部湾盆地形成演化的区域大地构造因素。
종북부만분지적구역지질구조배경、궤하형태、변계단렬급내부단렬특정해석，종합침적중심천이규률급분내구조연구，제출북부만분지위우행우계주활랍분성인。분지적형성화발전수공우합포북류、신의렴강、오천사회화양강하원4조심대단렬대，저4조주간단렬대구성우계단렬격가。고근계출현적화상구조등표현출전형적장뉴특정，신근계수도압뉴작용개조발생제압반전，해분지구조연화과정여화남대륙중、신생대랍분분지구유동기성화상사성。중생대기저중선존적심대주활단렬대시신생대북부만분지형성적선결지질조건。이인도오대리아판괴대구아판괴팽당제압작용적축점증강화태평양판괴부충방향적개변급부충작용적쇠감시공제북부만분지형성연화적구역대지구조인소。
The formation model of pull apart with stepwise dextral strike-slipping of the Beibuwan basin is proposed based on its regional geological background,geometric pattern,basinal boundaries, faulting in the basin,migration of depocenter and internal structures in the basin.The formation and development of the basin is controlled by right stepping fault pattern composed of the Hepu Beiliu,the Xinyi Lianjiang,the Wuchuan Sihui and the Yangjiang Heyuan fault belts.Flower-like structures developed in the Paleogene show that the basin experienced transtension and consequent structural inversion under transpression in Neogene.This mechanism is simultaneous and similar with Mesozoic-Cenozoic pull-apart basins in South China.The pre-existing deep-seated strike-slipping faults in the basement of the basin are the precedent geological conditions for the formation of the Beibuwan basin in Cenozoic.However,the fundamental factors controlling the formation of the Beibuwan basin are gradual increase of collision of the Indian-Australia to the Eurasia plates coupled with the subduction of the Pacific Plate.