论构造耦合作用  

DISCUSSION ON THE STRUCTURAL COUPLING

作　　者：郭令智[1] 朱文斌[1] 马瑞士[1] 孙岩[1] 王锋[1] 

机构地区：[1]南京大学地球科学系,江苏南京210093

出　　处：《大地构造与成矿学》2003年第3期197-205,共9页Geotectonica et Metallogenia

基　　金：国家自然科学基金资助项目(批准号:40173001和40172067).

摘　　要：构造耦合作用是一种普遍存在的地质现象。现今东、西太平洋的构造差异及古太平洋和现今太平洋大陆边缘构造差异与俯冲的洋壳板块性状有关,即:①俯冲角度;②俯冲角度的改变;③俯冲速率;④俯冲速率的改变;⑤俯冲深度;⑥俯冲板块前缘与海沟间的水平距离;⑦俯冲板块在670km上、下地幔界线处的构造形态;⑧俯冲板块的位移及位移方向。这种深部构造活动对浅部构造形成的制约和影响,是活动大陆边缘构造耦合现象的具体表现。中国西北部的盆山耦合现象是大陆内部的构造耦合作用,印度板块与欧亚板块碰撞产生的远距离效应,导致中亚地区产生陆内A型俯冲,A型俯冲是造成盆地消亡、山系形成的重要因素。The structural coupling is a common g eological phenomenon.The structur al differences between the eastern and western active continen tal margins of the modern Pacific and between paleo-Pacific and modern-P acific continental margins have relationship with the nature and appearance of subducted oceanic plate,namely,1.subducting angle;2.change in sub ducting angle;3.subducting velocity;4.change in subducting velocity;5.subducting depth;6.horizontal d istance between the front of the subd ucted plate and trench;7.structura l appearance of the subducted plate at the 670km boundary of upper and lower mantle and;8.the displacement and the direction of the subducted plate.The control and affection of deep-level structural activity to shallow-level structural formation is an actual behavior of structural coupling in the active continental margin.The basin-mount ain coupling phenomenon is an intrac ontinental structural coupling.The far-field effect of collision of In dia-Eurasia results in the intracontinental A-type subduction in central Asia.The A-type subduction is a key factor of van-ishing of a basin and the formation of mountain system.

关 键 词：构造耦合作用 太平洋 中国西北部 活动大陆边缘 大陆内部 

分 类 号：P541[天文地球—构造地质学]