摘要:
根据地质、地球物理和地貌等资料,系统分析了洞庭盆地与雪峰、幕阜造山带之间的结构样式、变形特征及形成演化,认为该区中、新生代造山带与盆地之间存在极其明显的耦合关系:1)燕山早中期(晚侏罗世—早白垩世),研究区的物源来自周边的山地,盆—山耦合所表现的只是地表高处剥蚀、低处堆积的填平补齐关系。2)燕山晚期的盆山耦合(晚白垩世早中期),洞庭盆地的形成与当时雪峰、幕阜造山带后期的伸展塌陷构成盆山耦合现象,此期由于受到太平洋板块向欧亚大陆板块作斜向俯冲作用影响,造山带的快速隆升造成沿着扭张性断层的走向发育一系列的雁行断块,控制着盆地的发展,二者之间形成耦合作用。3)早喜马拉雅期(晚白垩世晚期—早第三纪),受张裂的大地构造环境的影响,盆内被强烈的伸展变形,箕状断陷盆地的特征更加明显,湖盆扩大。4)晚喜山期(晚第三纪—第四纪),自渐新世喜马拉雅运动主幕以来,雪峰、幕阜造山带总体表现为弱挤压—压扭造山隆升及逐渐被剥蚀,并为洞庭盆地晚第三纪—第四纪坳陷型沉积提供物源。
Abstract:
According to the data of geology, physical geography, the structural physiognomy and so on, the style of the structure, the feature of the transmutation and formation between Dongting basin and Xuefeng -Mufu Orogenic belt are completely analyzed, it is considered that there is extreme coupling between the Orogenic belt and basins in the different periods of Meso-Cenozoic:1）The early and metaphase stage of Yansha（J3—K1-2），the resources of the study area is from the mountain around, the coupling of mountainbasin only indicates the filling and leveling up relation of the erosion of high area ,accumulation of low area. 2）The late stage of Yanshan（K31-2），Due to the effect of the Pacific Ocean plate causing the sidelong nose down the Eurasia plate in this period，Xuefeng-Mufu Orogenic belt was quickly uplifting and forming a series of fault blocks which controlled the development of Dongting basin along the extension-compression fault. The formation of Dongting basin and the stretching and sinking of later time of Xuefeng-Mufu Orogenic belt.3）The early stage of Himalayan movement（the late stage of the late Cretaceous to the Paleogene）the period of which Xuefeng-Mufu Orogenic belt the extension environment is the main reason that Dongting basin are extremely extention and transmutation, tenso-shear rift basin are more dustpan-shaped. 4）The late stage of Himalayan movement（Neogene-Quaternary）, the Xuefeng-Mufu Orogenic Belt since the main episode of the Himalayan movement in the Oligocene totally displaing weakly compressive and comresso-shear orogenic uplifting and being gradually denuded and leveled,and providing material sorces for the down-warped deposition of the Dongting Basin in the Neogene-Quaternary.
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