马尼拉俯冲带中段增生楔精细构造特征及微型圈闭盆地发育模式探讨
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摘要
对马尼拉俯冲带中段高精度地形数据编辑后绘制成图,联合之前所获取的地震剖面数据,对俯冲带增生楔的精细构造地貌特征及发育模式进行了深入探讨.在增生楔下构造区发现了大量狭长的微型圈闭盆地,经过对其平面断裂特点与深部应力状态的分析,发现增生楔从俯冲前缘到脊顶区其构造特点的转变对应着微型圈闭盆地4个完整的发育阶段,即初期的加积断裂阶段、中期的圈闭成盆阶段、后期的挤压消亡阶段乃至最终的隆升推覆阶段,揭示出一种新型的俯冲带增生楔发育模式,并推断其本质是深部板片俯冲活动所产生的压应力在海底面的表现.
High-precision large-scale multi-beam topographic data was edited carefully and used to plot submarine geomorphic shadow graph finally.The fine tectonic features of accretionary wedges and developing patterns of the minisize trapped basins at middle part of Manila Subduction Zone were discussed deeply associating with a seismic profile crossing the study area collected before.Multiple long and narrow minisize trapped basins were identified in lower tectonic zone of accretionary wedge.After analyzing the planar break feature and its deep stress status, we proved that the change of tectonic features from lower tectonic zone to top of the wedge was corresponding to a complete developing process of the minisize trapped basin, that is, from accretion and break stage at start to trap and basin formation in middle stage, extrusion and extinction during late stage, and elevation and nappe stage at last.A new type of developing pattern for accretionary wedges was disclosed during the process and the essence of it was manifested to be the expression of compressive stress on sea floor which was produced by subduction activities of deep plate.
High-precision large-scale multi-beam topographic data was edited carefully and used to plot submarine geomorphic shadow graph finally.The fine tectonic features of accretionary wedges and developing patterns of the minisize trapped basins at middle part of Manila Subduction Zone were discussed deeply associating with a seismic profile crossing the study area collected before.Multiple long and narrow minisize trapped basins were identified in lower tectonic zone of accretionary wedge.After analyzing the planar break feature and its deep stress status, we proved that the change of tectonic features from lower tectonic zone to top of the wedge was corresponding to a complete developing process of the minisize trapped basin, that is, from accretion and break stage at start to trap and basin formation in middle stage, extrusion and extinction during late stage, and elevation and nappe stage at last.A new type of developing pattern for accretionary wedges was disclosed during the process and the essence of it was manifested to be the expression of compressive stress on sea floor which was produced by subduction activities of deep plate.
引文
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[10] Schellart W P.Quantifying the net slab pull force as a driving mechanism for plate tectonics.Geophys.Res.Lett.,2004,31,L07611,doi:10． 1029/2004GL019528
[11] Schellart W P,Freeman J,Stedman D R,et al.Evolution and diversity of subduction zones controlled by slab width.Nature,2007,446 :308 ～ 311
[12] Ienaga M,McNeill L C,Mikada H.Borehole image analysis of the Nankai Accretionary Wedge,ODP Leg 196:Structural and stress studies.Tectonophysics,2006,426 (1 2) :207 ～ 220
[13] Schnurle P,Liu C S,Lallemand S E,et al.Structural insight into the south Ryukyu margin:Effects of the subducting Gagua Ridge.Tectonophysics,1998,288:237～250
[14] Dominguez S,Lallemand S E,Malavieille J,et al.Upper plate deformation associated with seamount subduction.Tectonophysics,1998,293 :207～224
[15] Ranero C R,Huene R.Subduction erosion along the Middle America convergent margin.Nature,2000,404 :748 ～ 752
[16] Eric J Phinneya,Paul Mannb,Millard F Coffinb,et al.Sequence stratigraphy,structural style,and age of deformation of the Malaita accretionary prism (Solomon arc-Ontong Java Plateau convergent zone).Tectonophysics,2004,389:221～246
[17] 李家彪,金翔龙,阮爱国等.马尼拉增生楔中段的挤入构造.科学通报,2004,49(10) :1000～1008 Li J B,Jin X L,Ruan A G,et al.Indentation tectonics in the accretionary wedge of middle Manila Trench.Chinese Science Bulletin(in Chinese),2004,49(10) :1000～1008
[2] 臧绍先,宁杰远.菲律宾海板块与欧亚板块的相互作用及其对东亚构造运动的影响.地球物理学报,2002,45(2) :188～197 Zang S X, Ning J Y. Interaction between Philippine Sea Plate (PH) and Eurasia (EU) Plate and its influence on the movement eastern Asia. Chinese J. Geophysics ( in Chinese), 2002, 45(2) :188～197
[ 3 ] Brias A, Pautot G. Reconstructions of the South China Sea from structural data and magnetic anomalies. In: Jin X, Kudrass H R, Pautot G, eds. Marine Geology and Geophysics of the South China Sea. Proc. Symp. on Recent Contributions to the Geological History of the South China Sea (in Chinese). Beiiing: China Ocean Press, 2000． 60～70
[4] 丁巍伟,杨树锋,陈汉林等.台湾岛以南海域新近纪的弧-陆碰撞造山作用.地质科学,2006,41(2) :195～201 Ding W W , Yang S F, Cheng H L, et al. Arc-continent collision orogeny in offshore Taiwan during Neogene. Chinese Journal of Geology (in Chinese),2006,41 (2) :195～201
[5] Gutscher M A,Kukowski N,Malavieille J,Lallemand S.Material transfer in accretionary wedges from analysis of a systematic series of analog experiments.Journal of Structural Geology ,1998,20(4) :407～416
[6] Huene R von,Weinrebe W,Heeren F.Subduction erosion along the North Chile margin.Geodynamics,1999,27 :345～358
[7] Soh W,Tokuyama H.Rejuvenation of submarine canyon associated with ridge subduction.Tenryu Canyon,off Tokai,Central Japan.Mar Geol,2002,187 :203 ～ 220
[8] 张健,石耀霖.东亚陆缘带构造扩张的深部热力学机制.大地构造与成矿学,2003,27(3) :222～227 Zhang J,Shi Y L.Thermodynamics mechanism of the marginal extensional belt of East Asia.Geotectonica Et Metallogenia (in Chinese),2003,27(3) :222～227
[9] 吴时国,刘文灿.东亚大陆边缘的俯冲带构造.地学前缘,2004,11(3) :16～22 Wu S G,Liu W C.Tectonics of subduction zone in the East Asia continental margin.Earth Sciences Frontiers (in Chinese),2004,11(3) :16～22
[10] Schellart W P.Quantifying the net slab pull force as a driving mechanism for plate tectonics.Geophys.Res.Lett.,2004,31,L07611,doi:10． 1029/2004GL019528
[11] Schellart W P,Freeman J,Stedman D R,et al.Evolution and diversity of subduction zones controlled by slab width.Nature,2007,446 :308 ～ 311
[12] Ienaga M,McNeill L C,Mikada H.Borehole image analysis of the Nankai Accretionary Wedge,ODP Leg 196:Structural and stress studies.Tectonophysics,2006,426 (1 2) :207 ～ 220
[13] Schnurle P,Liu C S,Lallemand S E,et al.Structural insight into the south Ryukyu margin:Effects of the subducting Gagua Ridge.Tectonophysics,1998,288:237～250
[14] Dominguez S,Lallemand S E,Malavieille J,et al.Upper plate deformation associated with seamount subduction.Tectonophysics,1998,293 :207～224
[15] Ranero C R,Huene R.Subduction erosion along the Middle America convergent margin.Nature,2000,404 :748 ～ 752
[16] Eric J Phinneya,Paul Mannb,Millard F Coffinb,et al.Sequence stratigraphy,structural style,and age of deformation of the Malaita accretionary prism (Solomon arc-Ontong Java Plateau convergent zone).Tectonophysics,2004,389:221～246
[17] 李家彪,金翔龙,阮爱国等.马尼拉增生楔中段的挤入构造.科学通报,2004,49(10) :1000～1008 Li J B,Jin X L,Ruan A G,et al.Indentation tectonics in the accretionary wedge of middle Manila Trench.Chinese Science Bulletin(in Chinese),2004,49(10) :1000～1008
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