摘要
本文重点简述了特提斯构造域内古、中、新三个演化阶段的蛇绿混杂岩与岛弧带的时空展布及其为－弧－盆体系，所识别出的蛇绿混杂岩、洋中脊拉斑玄武岩、大洋沉积物和岛弧带等地质记录，提供了东特提斯早期大洋岩石圈板块运动的有力证据。同时，与岛弧有关的不同时期不同阶段的各种弧前盆地、弧间盆地和孤后盆地成为造山带板块会聚边缘特征的标志。这些类型多样的沉积盆地的形成与演化也颇有特色，它们受制于东特提斯构造域内复杂的地质构造背景的影响和控制。很明显，盆地均经历了断陷拉张－稳定沉降－挤压隆升的演化过程。断陷拉张阶段多以火山活动强烈与发育扇三角洲沉积为典型特征；稳定沉降阶段主要碳酸盐与陆源的混合和低密度浊流沉积；挤压阶段早期发育海底扇．需要强调的是，普遍存在于各种盆地中的石英质糜棱岩岩届物源是确定再旋回造山带的重要因素。典型的义敦岛弧与沙鲁里山岩浆弧之间的弧－弧碰撞模式及其外延到整个东特提斯构造域内都是很普遍的。义敦岛弧的成长是一个从早期裂谷基础上由不成熟到成熟的阶段发展起来的过程。沙鲁里山岩浆弧在一个古老陆块基础上发展而形成。它们之间的俯冲、碰撞，造成柯鹿洞－亚金带的造山并抬升。这种造山作用不仅向西提供了大量的糜棱岩岩屑，而且在它?
The spatio-temporal distribution of the ophiolitic melanges and island-arc zones is emphasized in combination with the trench-arc-basin systems in the eastern Tethyan tectonicdomain, for which three evolutionary stages of Eo-Tethys, Mid-Tethys and Neo-Tethyshave been distinguished. The geological records of the ophiolitic melanges,mid-ocean ridgebasalts,oceanic sediments and island-arc zones,which are recognized,have provided essential evidences for plate movement in the early oceanic lithosphere. The plate convergentmargins in orogenic zones are characterized by all kinds of fore--arc,inter--arc and back-arcbasins which are related with island arcs and formed in varying times and stages. Moreover,the formation and evolution of the distinctive basins are sujected to the effects andcontrols of different geological settings. It is obvious that most of the basins have experienced three stages of evolution,including rifting and extensional,steady sinking,and compressional and uplifting processes. The first stage is characterized by intense volcanic tivities and well-developed fan-deltaic sediments 3the second stage by mixed and low-density turbidity current deposits of carbonates and siliciclastics,and the early time of the thirdstage by the development of submarine fans. It is important that the features of recyclingorogenesls in many basins are indicated by the terrigenous elastic sediments of quartziticmylonite. There is a typical example for arc-arc collision between the Yidun island arc andShalulishan magmatic arc,or even throughout eastern Tethys. The growth of the Yidunisland arc records the transition from immature to mature arc on the basis of the early rift,whereas the Shalulishan magmatic arc was developed on an ancient landmass. The subduction and collision of the two arcs stimulated the uplifting of the Korlondo--Yajin zone. Theorogenesis not only brought westwards about a vast amount of mylonite clasts,but also resulted in the formation of the lag-type granitoids in the Cuojiaoma-Cuomolong zone and ofSn polymetallic metallogenic zones in the west of Yidun. Besides,the arc-continent collisionmay be served as an additional model for orogenesis. Finally,the common features are alsodescribed for the basins and island arcs on the plate convergent margins in the easternTethyan tectonic domain.
