柴达木盆地北缘赛什腾—锡铁山新第三纪末斜冲构造及地质意义
详细信息    本馆镜像全文|  推荐本文 |  |   获取CNKI官网全文
摘要
柴达木盆地北缘赛什腾—锡铁山左行斜冲断裂研究得到国家重点基金研究发展规划项目(G1998040800)和鱼卡、绿梁山幅1:5万区域地质调查项目的资助。赛什腾——锡铁山左行斜冲断裂带呈北西—南东延伸,断裂带内部发育断层泥、断层角砾及断层带劈理等,断层上盘为赛什腾——锡铁山组成的推覆体,推覆体成右行斜列展布,下盘主要地层组成为新第三纪油沙山组。本文在对赛什腾——锡铁山斜冲断裂详细地段构造解析的基础上,结合盆地的沉积特征、地球物理资料等对该斜冲断裂的几何学、运动学及形成时代进行了研究,论文着重探讨了赛什腾——锡铁山斜冲断裂的地质意义。
     (1)对柴达木盆地北缘的赛什腾——锡铁山一带出露的地层进行了较为系统的划分,厘定了古元古代达肯大坂岩群、奥陶——志留纪滩间山(岩)群、泥盆纪上泥盆统埃姆尼克群、石炭——二叠纪中吾农山群果可山组。将本区的地层划分为两个构造层:既变质岩系构成的基底构造层;中生代、新生代的沉积岩系构成的盖层构造层。
     (2)对柴达木盆地北缘的赛什腾—锡铁山左行斜冲推覆构造的几何特征进行了系统研究,根据推覆体展布以及与凹陷关系将其分为三段,即呈斜列式展布赛什腾、绿梁山和锡铁山左行斜冲断裂。
     (3)根据断裂断裂带的宏观特征、断层带劈理特征、断裂带附近的牵引褶皱和断层下盘的平面反“S”型褶皱以及断层上盘剖面正花状构造和平面左行小型平移断层,认为赛什腾-锡铁山断裂带运动学主要表现为剖面上的逆冲、平面上的左行走滑特点,并且走滑量具有自西向东增大之势。但总体以逆冲为主。因此,将其称为左行斜冲断裂构造。
     (4)通过对赛什腾——锡铁山南侧盆地内部构造展布、盆地内地层厚度变化以及地震地质资料分析,探讨了赛什腾——锡铁山斜冲断裂作用在盆地内的响应。认为逆冲推覆构造的展布与盆地内的褶皱构造、断裂构造的展布具有一致性。逆冲推覆构造呈斜列式形展布与盆地内的也呈斜列式反“S”形展布的构造具有密切关系,都属于断裂左行斜冲的产物。
     (5)根据地震质料、沉积特征、地层的沉积接触关系、断裂切割地层关系以及与断裂相关的褶皱卷入地层的研究,认为柴达木盆地北缘的赛什腾——锡铁山逆冲推覆构造形成于中侏罗世,而左行逆冲断裂带定型于新第三纪上新世末。推覆构造的形成,导致柴达木地块下沉,推覆体持续逆冲盆地持续沉积,沉积中心也变更。
     (6)论文探讨了赛什腾——锡铁山斜向逆冲推覆构造的地质意义,认为赛什腾-锡铁山断裂斜冲作用是印度板块与欧亚板块碰撞、会聚的远程效应的结果,该认识对于研究柴北缘区域构造格局、盆山关系以及更大尺度的断裂带或造山带的斜向逆冲作用具有理论意义,对柴达木北缘的油气预测、推覆体金属矿床的分布、形成具有指导意义。通过该断裂带的研究,有利于进一步探讨青藏高原的隆升机制。
Based on the national key project for basic research on Tibetan plateau (G1998040800) and the 1:50000 regional geological survey project of Yuka and Liuliangsan area ,a Neogene Sertenshan-Xitieshan Obligue -Trusting Fault of (SXOTF) is stuied in the Northern Qaidam Basin. SXOTF is recognized in the Northern Qaidam based on the analysis of structures of area.This oblique trusting fault zone with northwestern-southeastern trending consists of Fault gouge,fault breccia and fault cleavage. Fault hanging wall consists of Sertengshan-Xitieshan napple, which is distribution in dextral en echelon. Fault footwall consists of Youcangshan Formation in Neogene. This paper emphasize the research of geometry, kinematics, age of formation of oblique-thrustin. It is discussed that geological significance of obligue -trusting.
    (1) This paper classified the strata of Sertengshan-Xitieshan in northern Qaidam basin into Daken-dabanyan group in Lower Proterozoic, Tanjianshan group in Ordovician-Silurian period, Aimunike group in Upper Devonian period and Guokesan formation of Zhongwu-nunsan group in Permo-Carboniferous. The strata of the region are divided into two structural layers: the basement rock consisting of metamorphic rock and cover layer of Mesozoic and Neozoic sedimentary rock..
    (2) The geometry of left oblique-thrust fault zone of Sertengshan-Xitieshan in northern Qaidam basin was studied systemically. According to the spread of nappe and relation between the nappe and depression, Oblique-thrust fault zone was divided into three parts in this paper: Sertengshan,Lvliangshan and Xitieshan.
    (3) According to macroscopic characteristics of fault zone, cleavage characters of fault zone, drag folds, the reverse "s" fold in the footwall, positive flower structures and small left strike-slip fault, the kinematics characters of fault zone of Sertengshan-Xitieshan are concluded: thrusting in section, left-slip fault in plane and the strike-slip displacement increasing from the west to the east. Thrusting is the main character, so it was named as left-slip oblique-thrusting fault.
    (4) Through the analysis on the spread of inner structure, thickness change of strata and seismic and geological data in the southern basin of Sertengshan-Xitieshan, this paper discussed the response of oblique-thrust effect on basin. There are coherent between the spread of oblique-thrusting structure, fold and fault structure. There were close relationships between oblique-thrust structure and the reverse "s" structure in the basin. Both of them are result of the left oblique-thrusting.
    
    
    (5) According to the study on seismicic data, sedimentary characteristics, contact relations, incision relation of the faults and strata related to the folds which are associated with the faults, this paper reached the conclusions: the oblique-thrusting structure of Sertengshan-Xitieshan in northern Qaidam basin was formed in middle Jurassic and the left-thrusting fault zone was established in the late Pliocene of Neogene. The formation of the nappe led to sinking of Qaidam massif, nappe thrusting basin depositing persistently and the sedimentary center changed.
    (6) The geological significance of oblique-thrusting fault of Sertengshan-Xitieshan was discussed in this paper. The oblique-thrusting effect of Sertengshan-Xitieshan is the result of the long distance effction of Himalayan orogenic belt intracontinent subducting, which is of great theory significance for studying regional structural framwork, relations between basins and mountains and oblique-thrusting effect of large-scale fault zone or orogen in northern Qaidam basin. Moreover, the result is of guidance significance for the forecast of combination gas, distributing and formation of nappe metal deposit in northern Qaidam basin. The study on the fault zone will promote the discussion of the rising mechanism of the Tibeteau Plateau.
引文
1.黄汲清、任纪舜、姜春发等,1977,中国大地构造基本轮廓(J),地质学报,N02,p117-135。
    2.李春昱、王荃、刘学亚等,1986,亚洲大陆构造图(M),地质出版社。
    3.王鸿祯、刘本培、李思田,1990,中国及邻区大地构造划分和构造演化阶段。中国及邻区构造古地理和生物古地理,中国地质大学出版社,p3-34。
    4.崔军文等,1999,阿尔金断裂系[M],地质出版社。
    5.姜洪训、高焕章,1989,柴达木盆地北缘逆冲推覆构造及其含油气性研究[M],西北大学出版社。
    6.狄恒怒,1984,柴达木盆地北缘逆冲断裂及其找油前景[J],石油与天然气地质,第五卷,第二期。
    7.黄汉纯、黄庆华、马演生,柴达木盆地地质与油气预测[M],北京,地质出版社。
    8.汤锡元、姜洪训、谢广成,1983,柴达木盆地的波浪状镶嵌构造特征及其对油气的控制[J],石油实验地质,第4期。
    9.胡受权、郭文平、曹运江等,2001,柴达木盆地北缘构造格局及在中新生代的演化[J],新疆石油地质,第1期,p13-16。
    10.B.Meyer,青海省地质矿产局,1991,青海省区域地质志[M],地质出版社。
    11.张恺,1993,关于柴达木盆地基底性质及深部古生界油气源的探讨,青海石油,第11卷,第四期。
    12.罗祖金、汤锡元,1986,柴达木盆地北缘断裂带石油地球化学及油源问题[J],石油实验地质,第2期,
    13.曾联波、金之钧、汤良杰等,2001,柴达木盆地北缘油气分布的构造控制作用[J],地球科学,Nol,P55-58。
    14.陈世锐、徐凤银、彭德华,2000,柴达木盆地构造特征极其控油意义[J],新疆地质,No:3,P175-180
    15. Tapponnier and P.Molnar, 1977,Active faulting and Cenozoic tectonics of China[J].Geophys. Res.,82(20),p.2905-2930.
    16. Tapponnier,G.Peltzer and R.Armijo,1986,On the mechanics of the collision between India and Asia[A]. in Collision Tectonics, edited by M.P.Coward and A.C.Ries, Geol. Soc. Spec.publ. London, 19 ,p 115 - 157.
    17.王根厚,李明,冉书明等,2001,转换断层极其地质意义—以阿尔金转换断层为例[J],成都理工学院学报,Nol,p183-186
    18.王根厚,冉书明等,2001,柴达木盆地北缘赛什腾—锡铁山左行逆冲断裂及地质意义[J],地质力学学报,Vol7,No3,224—230。
    19.赖绍聪、邓晋福、赵海玲,1996,柴达木北缘古生代蛇绿岩及其构造意义,现代地质,10(1),p18-28
    20.赖绍聪、邓晋福、赵海岭,1996,柴达木北缘奥陶纪火山作用与构造机制,西安地质学院学报,18(3),P8-14。
    21.杨明慧,1998,南祁连南缘弧形逆冲推覆构造,中国区域地质,Nol7(2),P213-217。
    
    
    22.杨经绥、许忐琴、李海兵等,1998,我国西部柴北缘地区发现榴辉岩,科学通报,43(1),P1544-1549
    23.洪流、徐志斌,1997,试论柴北缘岩浆系列及其大地构造演化,大地构造与成矿学,2(1):p41-50
    24.要惠芳,1993,祁连山南北缘逆冲推覆构造演化特征和找油方向,含油气盆地地质学研究进展(赵重远主编),P174-183
    25.杨明慧,张盆压岭型地洼盆地的基本特征及其大地构造演化——对柴达木盆地北缘德令哈地洼的实例研究,大地构造与成矿学,22(3),P198-208
    26. Wang-Ping Chen,Chu-Yung Chen,John L.Nabelek, 1999,Present-day deformation of the Qaidam basin with implications for intra-continental tectonics. Tectonophysics. 305, 165-181.
    27. Richard R. Jones , Robert E. Holdsworth and Wayne Bailey, 1999, Lateral extrusion in transpression zones: the importance of boundary conditions, Journal of Structural Geology 6, 449-458, 1984
    28. Gary S. Solar and Michael Brown, 2001, Deformation partitioning during transpression in response to Early Devonian oblique convergence, northern Appalachian orogen, USA, Journal of Structural Geology, Vol. 23 (6-7) pp. 1043-1065
    29. D. Jiang, S. Lin and P.F. Williams, 2001, Deformation path in high-strain zones, with reference to slip partitioning in transpressional plate-boundary regions, Journal of Structural Geology, Vol. 23 (6-7) pp. 991-1005
    30. Basil Tikoff and Karl Peterson,1998,Physical experiments of transpressional folding, Journal of Structural Geology, Vol. 20. P661-672
    31. A.m. Casass,D.Gapais.T.N.Nalpas.,et al,2001,Analogue model of transpressive systems, Journal of Structural Geology, Vol. 23 pp. 733-743
    32. W.Dickson Cunningham, Brian F.Windley, Lewis A.Owen,et, 1997, Geometry and style of partitioned deformation within a late Cenozoic transpressional zone in the eastern Gobi Altai Mountains,Mongolia ,Tectonophysics,277(1997)285-306.
    33. J.V.A.Keller ,S.H.Hall, K.R.Mclay, 1997,Shear fracture pattern and microstructural evolution in transpressional fault zones from field and laboratory studies, Journal of Structural Geology, Vol. 19.No.9. P1173-1187.
    34. Paul Tapponnier,Xu Zhiqin,Francose Roger,et al. 2001, Oblique Stepwise Rise and Growth of the Tibet Plateau, Science, Vol. 294.No.23.p1671-1677.
    35. B.Meyer,P.Tapponnier,L.Bourjot, et al. 1998, Crustal thickening in Gansu-Qinghai, lithospheric mantle subduction,and oblique,strike-slip controlled growth of the Tibet plateau,Geophys, 135.p 1-47.
    36. Georges Herquel, Gerard Wittlinger and Jocelyn Guilbert, 1995, Anisotropy and crustal thickness of Northern-Tibet. New Constraints for tectonic modeling.,Geophysical Research Letters, Vol. 22.No.14.p1925-1928.
    37. P.Tapponnier, B.Meyer,J.P.Avouac, et al. 1990, Actiove thrusting and folding in Qilian Shan,
    
    and decoupling between upper crust and mantle in northeastern Tibet,Earth and Planetary Science Letters,97, p382-403.
    38、 AlSaffar, A. Geometry of fault-propagation folds; Method and application. Tectonophysics 1993 (223) ,p.363-380.
    39、 Alonso, J.L. and Teixell, A. Forelimb deformation in some natural examples of fault-propagation folds. In Thrust Tectonics, Ed K.R. Mc Clay, Chapman and Hall, 1992, New York. p.175-180.
    40、 Chapman, T.J. and Williams, G.D. Displacement-distance methods in the analysis of fold-thrust structures and linked-fault systems. Journal of the Geological Society, London, 1984 (141) , p.121-128.
    41、 Cozens, B.A. and Dunne, W.M. Displacement transfer at thrust terminations: Saltville thrust and Sinking Creek anticline, Virginia, U.S.A. Journal of Structural Geology, 1994 (16) , p. 769-779.
    42、 Dominic, J. and McConnell, D.A. The influence of structural lithic units in fault-related folds, Seminoe Mountains, Wyoming, U.S.A. Journal of Structural Geology, 1994 (16) , p.769-779.
    43、 Fisher, M.P., Woodard. N.B. and Mitchell. M.M. The kinematics of break-thrust folds. Journal of Structural Geology , 1992 (14) ,p.461-460.
    44、 Fisher,D.M. and Anastasio, D.J. Kinematic analysis of a large-scale leading edge fold, Lost Range, Idaho. Journal of Structural Geology 1994 (16) , p.337-354.
    45、 Hardy, S. and Poblet, J. Geometric and numerical modei of progressive lime rotation in detachment folds. Geology 1994 (22) ,p.371-374.
    46、 Hardy,S. A method for quantifying the kinematics of fault-bend folding. Journal of Structural Geology, 1995 (17) , p.1785-1788.
    47、 Homza, T.X and Wallace, W.K. Geometric and kinematic models for detachment folds with fixed and variable detachment depths. Journal of Structural Geology, 1995 (17) , p.575-587.
    48、 Jamison,W.R. Geometric analysis of fold development in overthrust terranes. Journal of Structural Geology, 1987 (9) ,959-973.
    49、 Laubscher, H.P. Fold development in the Journal Tectonophysics, 1976 (37) , p.337-362.
    50、 Mcconnellm D., A fixed-hinge, basement-involved fault-propagation folds, Wyoming, Bulletin of the American Association of Petroleum Geologists , 1994 (77) , p.1583-1593.
    51、 Mc Doug all, J.W. and Hussain, A. Fold and thrust-propagation in the western Himalaya based on a balanced cross section of the Surghar Range and Kohat Plateau, Pakistan, Bulletin of the American Association of Petroleum Geologists, 1991 (75) p.463-478.
    52、 Mitra, S. Fault-propagation folds: Geometry, Kinematic evolution, and hydrocarbon traps. Bulletin of the American Association of Petroleum Geologists, 1990 (74) p.921-945.
    53、 Rich, J.L. Mechanics of low-angle overthrust faulting as illustrated by Cumberland thrust block, Viginia, Kentucky, and Tennessee. Bulletin of the American Association of
    
    Petroleum Geologists, 1934 (18) , p. 1584-1596.
    54、 Suppe, J. Geometry and Kinematics of fault-bend folding. American Journal of Science 1983 (283) ,p.684-721.
    55、 Suppe, J. and Medwedeff, D.A. Geometry and Kinematics of fault-propagation folding. Ecological Geological Helvetiae, 1990 (87) ,p.33-46.

© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号

地址:北京市海淀区学院路29号 邮编:100083

电话:办公室:(+86 10)66554848;文献借阅、咨询服务、科技查新:66554700