谈调整构造

ON ADJUSTMENT STRUCTURE

调整构造是伸展型沉积盆地和造山带中普遍存在的构造，它与走向构造一起，控制了沉积盆地或造山带的基本轮廓与内部结构。调整构造横切走向构造，并与之共同控盆、控岩、控矿，并间隔开两侧不同的构造样式。它以长时期、多阶段活动，具有高渗透性为主要特征，是控制矿带展布与矿床就位的重要构造，也是固定成矿预测区与找矿靶区的重要依据之一，本文以鲁西、中亚及乌拉山—大青山地区、兰坪─思茅盆地区及右江盆地区为例，论述了调整构造的基本特征及控矿作用。

Adjustment structure including transfer in extensional tectonic region and side ramp in thrust and nappe tectonic region is a kind of transverse structure which wide- ly presents in extensional sedimentary basin or orogenic belt. lt is generated from kiaematic transverse difference in extensional or contractional rate and quantity to adjust kinematic difference between its two side blocks. According to field investigations in Western Shandong, Med - Asia, Walashan - Daqingshan mountains, Lanpiag - Simao basin in Westera Yunnan and Yiojing basia, and taking some typic adjustment structure in areas metioned above as examples , fuadamenntal features of the adjustment fault and its controlling to metallogenity have been elaborated in the paper. The adjustment structure , an associated result of exteational or contractional movement of trend structure , transects the trend structure , exhibits as strike slip fault or compresso - shear fault or extensional - shear fault, and in som cases , as transverse upwarping. lt is approximatly concurrently formed with the extentional or contractional trend stracture. Major adjustment structure has had geological interval behaviour , strucural styles , sedimentary faces , kinematic characters and basement me- chanical property in its one side differed from its another one . Therefore , the major adjustment fault can be detennined from comparative analysis to sediment - structure and extensional or contractional quantity in its both sides . lt also has high pemeability for long - live activity and multiple - stages evolution, mineralized zone, ore deposits, oil and gas fields distributed along with it. Therefore, this kind of struc- ture is one of some major factors to outline forecasting prospective areas of mineralization or exploration targets.