YAN Zhao-Kun,
WANG Xu-Ben,
LI Yong et al
.2017.Coupling between the dynamic processes at depth and geologic processes on the surface of the Longmenshan thrust belt.Chinese Journal Of Geophysics,60(7): 2744-2755,doi: 10.6038/cjg20170720
Coupling between the dynamic processes at depth and geologic processes on the surface of the Longmenshan thrust belt
YAN Zhao-Kun1,2, WANG Xu-Ben1,3, LI Yong1, LUO Wei1,3, YANG Yi-Hai1,3, WANG Xing-Jian1, SHAO Chong-Jian1, YAN Liang1
1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China; 2. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China; 3. Key Lab of Earth Exploration and Information Techniques of Ministry of Education, Chengdu 610059, China
Abstract：The 2008 Wenchuan great earthquake triggered the coseismic vertical displacements on the surface of the Longmenshan and foreland region. Based on the theory of elastic flexure model for thrust belts and foreland basins, this study conducted elastic flexure modeling for inversion of deformation data. Combining with the study on the deep geophysical characteristics (Poisson ratio, electrical structure), we determined the spatial distribution features of the effective elastic thickness (Te) in the Longmenshan foreland basin:the Te decrease from east to west, its values in the western Sichuan basin (10~20 km) are obviously smaller than the middle Sichuan basin (30~40 km). Based on the theoretical elastic flexure model and the structure of the Longmenshan foreland basin since Late Triassic, the changing trend of Te was inverted. It has decreased in the foredeep (the western Sichuan basin) of the Longmenshan foreland basin since Late Triassic. This change may be related with the long-term fusion in response to heating of the asthenosphere matter under the Songpan-Garzê block, and reflects the coupling relationship between the dynamic processes of earth's deep interior and the surface evolution of the basin.
Burchfiel B C, Royden L H, Van Der Hilst R D, et al. 2008. A geological and geophysical context for the Wenchuan earthquake of 12 May 2008, Sichuan, People's Republic of China. GSA Today, 18(7):4-11. Burov E B, Michel D. 1995. The effective elastic thickness (Te) of continental lithosphere:What does it really mean? Journal of Geophysical Research:Solid Earth, 100(B3):3905-3927. Cardozo N, Jordan T. 2001. Causes of spatially variable tectonic subsidence in the Miocene Bermejo Foreland Basin, Argentina. Basin Research, 13(3):335-357. Chen B, Chen C, Kaban M K, et al. 2013. Variations of the effective elastic thickness over China and surroundings and their relation to the lithosphere dynamics. Earth and Planetary Science Letters, 363:61-72. Chen S, Xu W M, Shi L, et al. 2013. Gravity field and lithospheric mechanical properties of Longmenshan fault zone and its surrounding areas. Acta Seismologica Sinica (in Chinese), 35(5):692-703. Clark M K, Royden L H. 2000. Topographic ooze:Building the eastern margin of Tibet by lower crustal flow. Geology, 28(8):703-706. De Michele M, Raucoules D, De Sigoyer J, et al. 2010. Three-dimensional surface displacement of the 2008 May 12 Sichuan earthquake (China) derived from Synthetic Aperture Radar:evidence for rupture on a blind thrust. Geophysical Journal International, 183(3):1097-1103. Densmore A L, Li Y, Ellis M A, et al. 2005. Active tectonics and erosional unloading at the eastern margin of the Tibetan Plateau. Journal of Mountain Science, 2(2):146-154. Enkelmann E, Ratschbacher L, Jonckheere R, et al. 2006. Cenozoic exhumation and deformation of northeastern Tibet and the Qinling:Is Tibetan lower crustal flow diverging around the Sichuan Basin? Geological Society of America Bulletin, 118(5-6):651-671. Flemings P B, Jordan T E. 1989. A synthetic stratigraphic model of foreland basin development. Journal of Geophysical Research:Solid Earth, 94(B4):3851-3866. Flemings P B, Jordan T E. 1990. Stratigraphic modeling of foreland basins:Interpreting thrust deformation and lithosphere rheology. Geology, 18(5):430. Fu B H, Shi P L, Guo H D, et al. 2011. Surface deformation related to the 2008 Wenchuan earthquake, and mountain building of the Longmen Shan, eastern Tibetan Plateau. Journal of Asian Earth Sciences, 40(4):805-824. Guo Z W, Deng K L, Han Y H, et al. 1996. The Formation and Development of Sichuan Basin (in Chinese). Beijing:Geological Publishing House. Hu M Q, Liu S F. 2012. 3-D modeling for flexural subsidence and deposition process of foreland basin. Acta Geologica Sinica (in Chinese), 86(1):181-187. Hubbard J, Shaw J H. 2009. Uplift of the Longmen Shan and Tibetan plateau, and the 2008 Wenchuan (M=7.9) earthquake. Nature, 458(7235):194-197. Li S T. 1995. Geodynamics of sedimentary basins-the main trend of basin research. Earth Science Frontiers (in Chinese), 2(3-4):1-8. Li S T. 2015. Advancement, trend and new challenges in basin geodynamics. Earth Science Frontiers (in Chinese), 22(1):1-8. Li Y, Allen P A, Densmore A L, et al. 2003. Evolution of the Longmen Shan foreland basin (western Sichuan, China) during the Late Triassic Indosinian orogeny. Basin Research, 15(1):117-138. Li Y, Densmore A L, Allen P A, et al. 2001. Sedimentary responses to thrusting and strike-slipping of Longmen Shan along eastern margin of Tibetan Plateau, and their implication of Cimmerian continents and India/Eurasia collision. Scientia Geologica Sinica, 10(4):223-243. Li Y, He P, Yan Z K, et al. 2010. Dynamics of Late Triassic Longmenshan foreland basin, China. Journal of Chengdu University of Technology (Science & Technology Edition) (in Chinese), 37(4):401-411. Li Y, Li B, Zhou R J, et al. 2007. The quantitative correlation between denudation volume and sedimentary flux in the denudation-accumulation system:examples from Minjiang river drainage system. Acta Geologica Sinica (in Chinese), 81(3):332-343. Li Y, Xu G D, Zhou R J, et al. 2005. Isostatic gravity anomalies in the Longmen Mountains and their constraints on the crustal uplift below the mountains on the eastern margin of the Qinghai-Tibet Plateau. Regional Geology of China (in Chinese), 24(12):1162-1168. Li Y D, Zheng Y, Xiong X, et al. 2013. Lithospheric effective elastic thickness and its anisotropy in the northeast Qinghai-Tibet plateau. Chinese Journal of Geophysics (in Chinese), 56(4):1132-1145,doi:10.6038/cjg20130409. Liu J, Zhang Z H, Wen L, et al. 2008. The MS8.0 Wenchuan earthquake co-seismic rupture and its tectonic implications-an out-of-sequence thrusting event with slip partitioned on multiple faults. Acta Geologica Sinica (in Chinese), 82(12):1707-1722. Liu Q Y, Li Y, Chen J H, et al. 2009. Wenchuan MS8.0 earthquake:preliminary study of the S-wave velocity structure of the crust and upper mantle. Chinese Journal of Geophysics (in Chinese), 52(2):309-319. Liu S F. 1995. The theoretical models for simulating the flexural process of foreland basin. Earth Science Frontiers (in Chinese), 2(3-4):69-77. Liu S F. 2008. Dynamic subsidence, another kind of subsidence superposed on flexural subsidence of retroarc foreland basin. Earth Science Frontiers (in Chinese), 15(3):178-185. Lou H, Wang C Y, Lv Z Y, et al. 2009. Deep tectonic setting of the 2008 Wenchuan MS8.0 earthquake in southwestern China-Joint analysis of teleseismic P-wave receiver functions and Bouguer gravity anomalies. Science in China Series D:Earth Sciences,52(2):166-179. Molnar P. 2012. Isostasy can't be ignored. Nature Geoscience, 5(2):83. Royden L H, Burchfiel B C, King R W, et al. 1997. Surface deformation and lower crustal flow in eastern Tibet. Science, 276(5313):788-790. Shan X J, Qu C Y, Song X G, et al. 2009. Coseismic surface deformation caused by the Wenchuan MS8.0 earthquake from InSAR data analysis. Chinese Journal of Geophysics (in Chinese), 52(2):496-504. Sinclair H D, Coakley B J, Allen P A, et al. 1991. Simulation of foreland basin stratigraphy using a diffusion model of mountain belt uplift and erosion:an example from the central Alps, Switzerland. Tectonics, 10(3):599-620. Tesauro M, Kaban M K, Cloetingh S A P L. 2009a. A new thermal and rheological model of the European lithosphere. Tectonophysics, 476(3-4):478-495. Tesauro M, Kaban M K, Cloetingh S A P L. 2009b. How rigid is Europe's lithosphere? Geophysical Research Letters, 36(16):1-6. Tian Y T, Kohn B P, Gleadow A J W, et al. 2013. Constructing the Longmen Shan eastern Tibetan Plateau margin:insights from low-temperature thermochronology. Tectonics, 32(3):576-592. Tong X P, Sandwell D T, Fialko Y. 2010. Coseismic slip model of the 2008 Wenchuan earthquake derived from joint inversion of interferometric synthetic aperture radar, GPS, and field data. Journal of Geophysical Research:Solid Earth, 115(B4):B04314, doi:10.1029/2009JB006625. Turcotte D L, Schubert G. 2014. Geodynamics. 3rd ed. Cambridge:Cambridge University Press. Unsworth M J, Jones A G, Wei W, et al. 2005. Crustal rheology of the Himalaya and Southern Tibet inferred from magnetotelluric data. Nature, 438(7064):78-81. Wang Q L, Cui D X, Zhang X, et al. 2009. Coseismic vertical deformation of the MS8.0 Wenchuan earthquake from repeated levelings and its constraint on listric fault geometry. Earthquake Science, 22(6):595-602. Wang Q, Qiao X J, Lan Q G, et al. 2011. Rupture of deep faults in the 2008 Wenchuan earthquake and uplift of the Longmen Shan. Nature Geoscience, 4(9):634-640. Wang X B, Luo W, Zhang G, et al. 2013. Electrical resistivity structure of Longmenshan crust-mantle under sector boundary. Chinese Journal of Geophysics (in Chinese), 56(8):2718-2727, doi:10.6038/cjg20130820. Wang X B, Zhang G, Fang H, et al. 2014. Crust and upper mantle resistivity structure at middle section of Longmenshan, eastern Tibetan plateau. Tectonophysics, 619-620:143-148. Wang Z, Su J R, Liu C X, et al. 2015. New insights into the generation of the 2013 Lushan Earthquake (MS7.0), China. Journal of Geophysical Research:Solid Earth, 120(5):3507-3526. Wang Z, Zhao D P, Wang J. 2010. Deep structure and seismogenesis of the north-south seismic zone in southwest China. Journal of Geophysical Research:Solid Earth, 115(B12):B12334, doi:10.1029/2010JB007797. Watts A B. 1951. An analysis of isostasy in the world's oceans 1. Hawaiian-Emperor Seamount Chain. Journal of Geophysical Research:Solid Earth, 83(B12):5989-6004. Watts A B, Karner G D, Steckler M S. 1982. Lithospheric flexure and the evolution of sedimentary basins. Philosophical Transactions of the Royal Society A:Mathematical, Physical and Engineering Sciences, 305(1489):249-281. Wei W, Sun R M, Shi Y L. 2010. P-wave tomographic images beneath southeastern Tibet:Investigating the mechanism of the 2008 Wenchuan earthquake. Science China Earth Sciences, 53(9):1252-1259. Xu Z Q, Li H Q, Hou L W, et al. 2007. Uplift of the Longmen-Jinping orogenic belt along the eastern margin of the Qinghai-Tibet Plateau:Large-scale detachment faulting and extrusion mechanism. Geological Bulletin of China (in Chinese), 26(10):1262-1276. Yan Z K, Li Y, Li H B, et al. 2015. Application of the material balance method in paleoelevation recovery:a case study of the Longmen mountains foreland basin on the eastern margin of the Tibetan Plateau. Acta Geologica Sinica, 89(2):598-609. Yan Z K, Li Y, Shao C J, et al. 2016. Interpreting the coseismic uplift and subsidence of the Longmen Shan foreland basin system during the Wenchuan earthquake by a elastic flexural model. Acta Geologica Sinica, 90(2):555-566. Yang S M, Lan Q G, Nie Z S, et al. 2012. Coseismic displacement caused by the 2008 great Wenchuan earthquake derived from various types of geodetic data. Chinese Journal of Geophysics (in Chinese), 55(8):2575-2588, doi:10.6038/j.issn.0001-5733.2012.08.009. Yuan B Q, Djomani Y H P, Wang P, et al. 2002. Effective lithospheric elastic thickness of southeastern part of Arctic Ocean-Eurasia Continent-Pacific Ocean geoscience transect. Earth Science-Journal of China University of Geosciences (in Chinese), 27(4):397-402. Zhang J S, Gao R, Ceng L L, et al. 2009. Relationship between characteristics of gravity and magnetic anomalies and the earthquakes in Longmenshan range and adjacent areas. Chinese Journal of Geophysics (in Chinese), 52(2):572-578. Zhang P. 2008. Coseismic displacement field of the 2008 MS8.0 Wenchuan earthquake determined by GPS. Sci. China (Ser. D), 38(10):1195-1206. Zhu J. 2008. The Wenchuan earthquake occurrence background in deep structure and dynamics of lithosphere. Journal of Chengdu University of Technology (Science & Technology Edition) (in Chinese), 35(4):348-356. 陈石, 徐伟民, 石磊等. 2013. 龙门山断裂带及其周边地区重力场和岩石层力学特性研究. 地震学报, 35(5):692-703. 郭正吾, 邓康龄, 韩永辉等. 1996. 四川盆地形成与演化. 北京:地质出版社. 胡明卿, 刘少峰. 2012. 前陆盆地挠曲沉降和沉积过程3-D模型研究. 地质学报, 86(1):181-187. 李思田. 1995. 沉积盆地的动力学分析——盆地研究领域的主要趋向. 地学前缘, 2(3-4):1-8. 李思田. 2015. 沉积盆地动力学研究的进展、发展趋向与面临的挑战. 地学前缘, 22(1):1-8. 李勇, 徐公达, 周荣军等. 2005. 龙门山均衡重力异常及其对青藏高原东缘山脉地壳隆升的约束. 地质通报, 24(12):1162-1168. 李勇, 黎兵, 周荣军等. 2007. 剥蚀-沉积体系中剥蚀量与沉积通量的定量对比研究——以岷江流域为例. 地质学报, 81(3):332-343. 李勇, 贺佩, 颜照坤等. 2010. 晚三叠世龙门山前陆盆地动力学分析. 成都理工大学学报(自然科学版), 37(4):401-411. 李永东, 郑勇, 熊熊等. 2013. 青藏高原东北部岩石圈有效弹性厚度及其各向异性. 地球物理学报, 56(4):1132-1145, doi:10.6038/cjg20130409. 刘静, 张智慧, 文力等. 2008. 汶川8级大地震同震破裂的特殊性及构造意义——多条平行断裂同时活动的反序型逆冲地震事件. 地质学报, 82(12):1707-1722. 刘启元, 李昱, 陈九辉等. 2009. 汶川MS8.0地震:地壳上地幔S波速度结构的初步研究. 地球物理学报, 52(2):309-319. 刘少峰. 1995. 前陆盆地挠曲过程模拟的理论模型. 地学前缘, 2(3-4):69-77. 刘少峰. 2008. 叠加于弧后前陆盆地挠曲沉降之上的另一类沉降——动力沉降. 地学前缘, 15(3):178-185. 楼海, 王椿镛, 吕智勇等. 2008. 2008年汶川MS8.0级地震的深部构造环境——远震P波接收函数和布格重力异常的联合解释. 中国科学:地球科学, 38(10):1207-1220. 单新建, 屈春燕, 宋小刚等. 2009. 汶川MS8.0级地震InSAR同震形变场观测与研究. 地球物理学报, 52(2):496-504. 王绪本, 罗威, 张刚等. 2013. 扇形边界条件下的龙门山壳幔电性结构特征. 地球物理学报, 56(8):2718-2727, doi:10.6038/cjg20130820. 韦伟, 孙若昧, 石耀霖. 2010. 青藏高原东南缘地震层析成像及汶川地震成因探讨. 中国科学:地球科学, 40(7):831-839. 许志琴, 李化启, 侯立炜等. 2007. 青藏高原东缘龙门-锦屏造山带的崛起——大型拆离断层和挤出机制. 地质通报, 26(10):1262-1276. 杨少敏, 兰启贵, 聂兆生等. 2012. 用多种数据构建2008年汶川特大地震同震位移场. 地球物理学报, 55(8):2575-2588, doi:10.6038/j.issn.0001-5733.2012.08.009. 袁炳强, Djomani Y H P, 王平等. 2002. 北冰洋-欧亚大陆-太平洋地学断面东南段岩石圈有效弹性厚度. 地球科学——中国地质大学学报, 27(4):397-402. 张季生, 高锐, 曾令森等. 2009. 龙门山及邻区重、磁异常特征及与地震关系的研究. 地球物理学报, 52(2):572-578. 张培震. 2008. GPS测定的2008年汶川MS8.0级地震的同震位移场. 中国科学D辑:地球科学, 38(10):1195-1206. 朱介寿. 2008. 汶川地震的岩石圈深部结构与动力学背景. 成都理工大学学报(自然科学版), 35(4):348-356.
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