BASEMENT DECOUPLING STRUCTURE IN JIANGNAN-XUEFENG——SERIES 1 OF THE SOUTHERN STRUCTURE STUDIES
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摘要: 基底拆离式构造是大陆板块边缘受到俯冲、消减、挤压和缩短作用时,在大陆板块内部的反应,即地壳内部受到水平挤压作用时,沿壳内"低速带"、"高导层"等软弱带产生多层次的拆离。这些发育在变质基底内的大型韧性剪切带把岩石圈板块的地壳拆离成若干"薄岩席",并沿拆离面发生大规模的滑移和推覆,使得板内古生界盆地的沉积盖层产生侏罗山式的褶皱与叠复,层间出现剪切与滑脱等由强及弱的递进变形改造和缩短,以达到中、上地壳剖面的平衡。文中讨论了江南—雪峰山"隆起带"的性质,认为它既不是造山带的"厚皮构造",也不属于沉积盖层褶皱的"薄皮构造"范畴,而是属于"过渡型的基底拆离式"的构造属性。它是在印支—早燕山运动期间由南东向北西(同时派生由南向北,由东向西)进行基底拆离和推覆的,成为控制整个扬子海相中古生界盆地改造变形的动力学来源和主导因素,同时也控制了海相油气的形成与聚集。Abstract: The basement decoupling structure is the reaction in continent plate when the margin of continent plate is subducted,subdued,extruded and shortened.Extruded under horizontal effect,the earth crust is decoupled along such flabby zones as "low velocity zone" and "high conductivity formation".These huge flexile shear zones in metamorphic basement divide the lithosphere plate into several "thin sheets".Along the decoupling surface,great scale slide and nappe take place,resulting in the Jura-type fold and superimposition of sedimentary cover of the Paleozoic basin within plate.Interbed shear slide and distorted rebuilding and shortening from strong to weak take place so as to balance the middle and upper crusts.It is discussed in this paper the attribute of Jiangnan-Xuefeng uplift which is neither "thick-skinned structure" of orogenic belt nor "thin-skinned structure" of sedimentary cover fold but "intergradational basement decoupling structure".From Indosinian to early Yanshanian,decoupling and nappe take place from SE to NW(S to N,E to W at the meanwhile).It is the dynamic source and domination controlling deformation of Yangtze marine facies Meso-Paleozoic basins and at the same time it controls the generation and accumulation of marine facies petroleum.
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Key words:
- basement decoupling /
- structural attribute /
- flexile shear zone /
- Jiangnan-Xuefengshan
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[1] 朱夏.中国东部板块内部盆地形成机制的初步探讨[J].石油实验地质,1978,(1):1～9 [2] Mattauer M.Intracontinental subduction.crust-mantle decollement and crustal-stacking wedge in the Himalayas and other collision belts[A].In:Coward M P,Ries A C,eds.Collision tectonics,Geological Society special publications 19[G].London:Geological Society Publishing House,1986.37～50 [3] 朱夏.活动论构造历史观[J].石油实验地质,1991,13(3):201～209 [4] 许志琴,卢一伦,汤耀庆等.东秦岭复合山链的形成—变形、演化及板块动力学[M].北京:中国环境科学出版社,1986.1～193 [5] Tapponnier P,Pehzer G,Armijo R.On the mechanics of the collision between India and Asia[A].In:Coward M P,Ries A C,eds.Collision tectonics,Geological Society special publication 19[G].London:Geological Society Publishing House,1986.115～157 [6] Tapponnier P,Molnar D P.Active faulting and tectonics in China[J].Journal of Geophysical Research,1991,82(20):2905～2930 [7] Coward M P.Thrust tectonics,thin-skinned or thick-skinned,and continuation of thrust to deep in the crust[J].Journal of Structural Geology,1983,5(2):113～124 [8] Davis G A,Lister G S,Reynolds S J.Structural evolution of the Whipple and South mountains shear zones,southwestern United States[J].Geology,1986,14:7～10 [9] 朱夏.试论古全球构造与古生代油气盆地[J].石油与天然气地质,1983,4(1):1～29 [10] 许靖华.碰撞型造山带的薄皮构造模型[J].中国科学(B辑),1980,(11):1081～1089 [11] 陈焕疆,朱夏.板块构造与中国油气矿床远景预测[A].见:李春昱,郭令智,朱夏等编.板块构造基本问题[M].北京:地震出版社,1986.427～454 [12] 黄汲清.中国主要地质构造单元[M].北京:地质出版社,1945.36～37 [13] 郭令智.华南板块构造[M].北京:地质出版社,2001.1～6 [14] 许靖华.是华南造山带而不是华南地台[J].中国科学(B辑),1987,(10):1107～1115 [15] 许靖华.弧后碰撞造山作用及其大地构造相[J].南京大学学报,1994,6(1):1～12 [16] 朱夏.朱夏论中国油气盆地构造[M].北京:石油工业出版社,1980.61～70 [17] 孙岩,施泽进,沈修志.层滑-倾滑断裂构造与油气地质研究[M].南京:南京大学出版社,1991 [18] 丁道桂,朱樱,陈凤良等.中下扬子区古生代盆地基底拆离改造与油气领域[J].石油与天然气地质,1991,12(4):376～384 [19] 丁道桂.基底拆离与多层次盖层滑脱的盆地改造作用[A].见:孙肇才,张渝昌编.中国油气盆地分析:朱夏学术思想研究论文集[G].北京:石油工业出版社,1993.153～159 [20] 刘宝珺.中国南方古陆沉积地壳演化与成矿[M].北京:科学地质出版社,1993 [21] 丘元禧,张渝昌,马文璞等.雪峰山的构造性质与演化:一个陆内造山带的形成与演化模式[M].北京:地质出版社,1999 [22] 蒋洪堪,战双庆,王洪勋.四川大足-福建泉州深部地电特征[J].地球物理学报,1992,35(2):214～222 [23] 王懋基.黑水-泉州地学断面的重磁解释[J].地球物理学报,1994,37(3):321～329 -
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