四川盆地北部米仓山冲断带多层滑脱系统构造分析
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摘要
根据野外地质、地震地质资料及平衡复原技术对米仓山山前二维构造特征进行解析,通过三维可视化分析对米仓山山前各断层的空间组合方式进行研究。结果表明,米仓山山前构造特征具有分层性:深部构造由震旦系滑脱层控制,发育基底逆冲断层;中部构造由震旦系与三叠系嘉陵江组滑脱层共同控制,具双重构造;浅层构造受三叠系嘉陵江组滑脱层影响,呈单斜构造。由于三叠系嘉陵江组顶部滑脱层向东逐渐抬升,导致了米仓山山前由西向东缩短率逐渐减小,中部双重构造中的断层主要呈5种组合特征:断层上发育次一级的调节断层,断层间彼此保持平行向两侧延展,断层与断层发生相交,断层逐渐向上抬升最终消亡,断层内部产生新的调节断层。
Micangshan mountain located in the southern margin of Qinling orogenic belt was subject to squeezing action from north to south since the Indosinian,thus developing multiple sets of detachment structures that led to complex deformation features in the piedmont of Micangshan mountain.By means of field geologic sections,seismogeology profiles and balance recover,this paper analyzes the 2D-structural characteristics of it,researches the spatial assemblage patterns of faults of 3D visualization in it.The result shows that the structures in the piedmont are of stratification: the deep structure was controlled by Sinian detachment zone,developing basement thrust fault;the middle structure was controlled by both Sinian and Triassic Jialingjiang detachment zones,and the shallow structure appeared a monocline controlled by the Jialingjiang detachment zone.The eastward gradual upraising of the top detachment zone of Jialingjiang formation resulted in decrease of shortening rate from west to east of the piedmont of Micangshan mountain.There exist five patterns of dual-structural fault combinations in the middle detachment zone: the secondary accommodate fault;a fault keeping parallel with other one and extending toward the two sides of it;a fault intersecting with other one;fault upraising gradually and subduction;generating new accommodate faults within original faults.
Micangshan mountain located in the southern margin of Qinling orogenic belt was subject to squeezing action from north to south since the Indosinian,thus developing multiple sets of detachment structures that led to complex deformation features in the piedmont of Micangshan mountain.By means of field geologic sections,seismogeology profiles and balance recover,this paper analyzes the 2D-structural characteristics of it,researches the spatial assemblage patterns of faults of 3D visualization in it.The result shows that the structures in the piedmont are of stratification: the deep structure was controlled by Sinian detachment zone,developing basement thrust fault;the middle structure was controlled by both Sinian and Triassic Jialingjiang detachment zones,and the shallow structure appeared a monocline controlled by the Jialingjiang detachment zone.The eastward gradual upraising of the top detachment zone of Jialingjiang formation resulted in decrease of shortening rate from west to east of the piedmont of Micangshan mountain.There exist five patterns of dual-structural fault combinations in the middle detachment zone: the secondary accommodate fault;a fault keeping parallel with other one and extending toward the two sides of it;a fault intersecting with other one;fault upraising gradually and subduction;generating new accommodate faults within original faults.
引文
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[2]李亚林,李三忠,张国伟.秦岭勉略缝合带组成与古洋盆演化[J].中国地质,2002,29(2):129-134.
[3]刘树根,邓宾,李智武,等.盆地结构与油气分布——以四川盆地为例[J].岩石学报,2011,27(3):621-635.
[4]吴磊,钱俊锋,肖安成,等.扬子地块西侧米仓山基底卷入式冲断带的构造分析[J].岩石学报,2011,27(3):681-688.
[5]吴世祥,马永生,金之钧,等.米仓山前陆盆地东段构造演化模式与油气聚集[J].石油勘探与开发,2006,33(1):14-16.
[6]李岩峰,曲国胜,刘殊,等.米仓山、南大巴山前缘构造特征及其形成机制[J].大地构造与成矿学,2008,32(3):285-292.
[7]Ma Y,Guo X,Guo T,et al.The Puguang gas field:newgiant discovery in the mature Sichuan basin,Southwest Chi na[J].AAPG Bulletin,2007,91:627-643.
[8]颜丹平,金哲龙,刘少峰,等.川渝湘鄂薄皮构造带多层拆离滑脱系的岩石力学性质及其对构造变形样式的控制[J].地质通报,2008,27(10):1687-1697.
[9]夏在连,徐国强,刘树根,等.米仓山东段—大巴山前缘圈闭构造样式分析[J].成都理工大学学报(自然科学版),2008,35(1):41-47.
[10]Suppe J.Geometry and kinematics of fault bend folding[J].Amer.Jour.Sci.,1983,283:684-721.
[11]Donatella Massoli H A K,Barchi M R.Structural evolutionof a fold and thrust belt generated by multiple decolle ments:analogue models and natural examples from thenorthern Apennines(Italy)[J].Journal of Structural Geolo gy,2006,28:185-199.
[12]管树巍,汪新,杨树锋,等.南天山库车秋里塔格褶皱带三维构造分析[J].地质评论,2003,49(5):464-473.
[13]管树巍,Plesch A,李本亮,等.基于地层力学结构的三维构造恢复及其地质意义[J].地学前缘,2010,17(4):140-150.
[14]贾东,李一泉,王毛毛,等.断层相关褶皱的三维构造几何学分析:以川西三维地震工区为例[J].岩石学报,2011,27(3):732-740.
[15]管树巍,汪新,杨树锋,等.位移转换的两种概念模型与实例[J].中国科学D辑:地球科学,2004,34(9):807-817.
[16]苗继军,贾承造,王招明.塔里木盆地北部库车地区秋里塔格构造带地层结构及其对构造变形的制约[J].地质科学,2005,40(4):558-569.
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