【作者】 王东安； 陈瑞君；

【Author】 Wang Dongan Chen Ruijun Institute of Geology,Chinese Academy of Sciences,Beijing 100029

【机构】 中国科学院地质研究所；

【摘要】 <正> 多条不同时代的缝合带把昆仑山西段和喀喇昆仑山由北向南分为四个地体(潘裕生,1992).为了便于研究和对比,以这四个地体为基础划分为相应的沉积区,即西昆仑北沉积区,西昆仑南沉积区、塔什库尔干-甜水海沉积区和喀喇昆仑沉积区(图1).更多还原

【Abstract】 With reference to the suture zone boundaries of the terranes, West Kunlun-Kara Kunlun region can be divided into four sedimentary areas from the north to the south, corresponding to the 4 different terranes.Their major sedimentary features are as follows: (1) North West Kunlun sedimentary area, it mainly develops clastic rock-carbonate rock formation.Before Permian, continuous thalassogeic formation was developed.This kind of stable sedimentary series is located at the north margin of Paleo-Tethys, and belongs to typical platformal shallow-water sedimentary facies, representing inner continental shelf sedimentary features.After late Permian, thick continental coarse-clasticrocks were formed.(2) South West Kunlun sedimentary area, beginning in Cretaceous , these sedimentary beds mainly consist of greywacke (rich in tuffaceous, siliceous and volcanic debris), shale and deep water carbonate rocks with intecalations of calc-alkaline island-arc volcanics, representing typical products of outer continental shelf margin and mobile zones of back-arc basins, and showing back-arc extensional bathyal sedimentary features.From late Devonian to Triassic, continuous marine facies deposition took place.In late Triassic, this area was abruptly changed into a fault basin, and continental molasse deposition began.(3) Tashikurgan-Tianshuihai sedimentary area.Before Permian, shallow-water continental shelf carbonate formation was developed, reflecting typical inner continental shelf deposition, After Triassic, the deposition gradually extended to outer continental basin, developed into gravity flow deposition with typical flysch marks.In early Jurassic, this area was abruptly changed into continental molasse to coal-bearing limnetic sedimentary environment, developed geo-cratic formation.(4) Kara Kunlun sedimentary area.Except for local bathyal siliceous rock-pelite-clastic rock flysch formation and siliceous rock-volcanic rock sedimentary formation in Triassic and Permian systems, the Permian and Jurassic systems show shallow-water facies fine-clastic to carbonate rock formation.From early Cretaceous, this area abruptly began to develop continental red coarse-clastic rocks, developed geo-cratic formation.A series of vertical changes in each sedimentary area, especially the big or the abrupt changes within continuous deposition, indicate the important, geologic events during the geologic evolution of each terrane, and can be regarded as important marks and evidences which reflect their turning stages.更多还原