Plate tectonic analysis of basin systems interspersed in orogenic belts requires that the effects of approximation be carefully distinguished from those of separation . 分析造山帶中盆地系的板塊構造時,需要將靠近作用與分離作用仔細區(qū)分開來。
At the same time , attained following fruits : 1 . the tectonic analysis indicated that the distortion of the foreland basin was mainly attributed to the movements of longmen mountains , the structural features , forming periods , and transformation fashions are different between the northern and southern segments 主要取得如下成果: 1 、構造研究表明川西坳陷形成與形變主要受控于龍門山造山帶,表現(xiàn)為坳陷內部南、北段構造特征、形成期及其變形方式上的差異。
Basing on the acquaintence of the stratum , the rock , the structural setting , the tectonic framework and the research in the stratum , the rock and the structure of dam area in detail , using the modern principle of tectonic analysis , this paper analyzes the geometry characteristics , the deformation characteristics , the dynamics characteristics , kinematics characteristics of the dislocation interfaces . further more this paper discuss " the structural generation , the structural sequence and the structural evolution of the dislocation interfaces 在了解區(qū)域地層、巖石、構造背景和格局等基礎上,結合對壩區(qū)地層、巖石和構造的詳細調查研究,采用現(xiàn)代構造解析的原理和方法,對壩區(qū)錯動帶幾何學特征、變形特征、動力學特征和運動學特征進行了全面的分析,并在此基礎上探討分析了壩區(qū)錯動帶的構造世代、變形序列及構造演化。
Based on the theory of plate tectonics and the new knowledge of continental dynamics , this paper starts mostly with tectonic analysis and then makes a comprehensive view on the characteristic of stratum composition , gold mine mineralized , magmatic activity as well as ruptures activity to discuss the yanshanian tectonic evolution of the xiaoqinling area under the regional tectonic framework of qinling orogenic belt 本文以板塊構造理論和大陸動力學研究的新認識為指導,采用以構造分析為主線,結合區(qū)內地層沉積、金礦成礦、巖漿活動以及南北兩側斷陷盆地形成演化等綜合分析,在秦嶺區(qū)域構造大框架下對小秦嶺燕山期的構造演化特征進行探討。
Tectonic analysis controlling gold mine mineralization in taihua group suggest that ductile fractures chang into brittle - ductile ones going with upliftling of xiaoqinling area after in - china orogeny . brittle fractures form on the basis of brittle - ductile ones that develop and inherit the characteristic of the latter stress field . folds and faults analysis in taihua group and its bilateral reveal that yanshanian tectonic evolution of xiaoqinling area undergo at least three phases of deformation 太華群內金礦成礦構造分析表明,印支期碰撞造山后小秦嶺擠壓抬升,控礦韌性剪切帶向脆韌性轉化( 207 148ma ) ,在脆韌性剪切帶基礎上疊加改造形成容礦斷裂,脆性斷裂的發(fā)育繼承了韌脆性剪切帶發(fā)育時的應力場特征。
Through the all - sided tectonic analyses , it can be deduced that there are two aspects will be the hidden defects to the dam and the engineering stability of the reservoir area . one is the dislocation interfaces resulting from the the majiaheba faultage ' s thrusting overriding and other causes of formation . the second is the region of strong deformation , such as the above of the dam , middle and high positions of the lava layers and the regions of overprint of the structure of ne to the one of nw , which should be taken into account especially 通過區(qū)域和壩區(qū)錯動帶的全面構造解析,認為由馬家河壩斷層逆沖推覆作用而在壩區(qū)形成的向金沙江下游緩傾的錯動帶以及其它成因的錯動帶是壩區(qū)和庫區(qū)工程穩(wěn)定的隱患,尤其是變形較強的壩址區(qū)上游區(qū)、中高層位以及北西向構造期的錯動帶疊加于北東向構造期錯動帶的部位,更應該引起足夠的重視。