Tectonic Activities in Middle and North Sections of Longmenshan Thrust Belt during Late Indosinian: Evidence from Structural Analysis and Detrital Zircon Geochronology
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摘要: 晚三叠世是四川盆地演化过程中的重要阶段，该时期盆地西部经历了从被动大陆边缘向前陆盆地的演变.为进一步厘定龙门山中北段印支晚期构造的具体活动时间及活动强度，本研究选择龙门山前中北段某地震剖面进行构造几何分析，结果显示龙门山前中北段大规模的逆冲推覆很可能在须家河组四段沉积初期就已经出现，其恢复的推覆位移量至少达到11 km；另外针对研究区晚三叠世地层开展碎屑锆石U-Pb年代学以及沉积学分析，结果显示~800 Ma主峰及沉积学响应表明须家河组三段沉积时期研究区域地层中具有大量来自龙门山中段彭灌杂岩的碎屑物质，反映龙门山中北段基底在须家河组三段沉积时期已经局部隆升并为研究区提供物源.Abstract: It is wildly shared that the western Sichuan basin changed from passive continental margin to a foreland basin during the Late Triassic. In order to depict this transition process as well as the time and intensity of the tectonic activity of Longmenshan thrust belt during Late Indosinian, a seismic section in the middle part of Longmenshan thrust belt was used to perform structural geometric analysis. The results show that the large scale thrusting of Longmenshan probably occurred during the early stage of the deposition time of T3x4 and the total displacement was at least 11 km. This is also supported by the sedimentary record of the detrital zircon U-Pb age from the synchrous strata. The major age peak of ~800 Ma shows great affinity to the Pengguan complex and Baoxing complex from the middle section of Longmenshan belt. It is concluded that the basement in the middle part of Longmenshan belt was uplifted partly during T3x3 and provided materials for the western Sichuan basin.
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图 1 地震测线（A-A’）所处的地质及大地构造位置
Fig. 1. Geological sketch and tectonic position of the seismic line A-A'
图 2 龙门山前中段地震剖面的构造解释方案
图中红色虚线表示印支晚期形成的隐伏断层，红色线条及向上箭头表示钻井位置
Fig. 2. Structural interpretation of seismic section in the fore-middle section of Longmenshan thrust belt
图 3 晚三叠世须家河组样品LMS-01镜下照片
Qm.单晶石英；Kfs.钾长石；Pl.斜长石；Lt.岩屑
Fig. 3. Microscopic photo of sample LMS-01 from Xujiahe Formation in Upper Triassic
图 4 龙门山中段须家河组以及样品古水流向图
Fig. 4. Stratigraphy of Xujiahe Formation in the middle section of Longmenshan thrust belt and the paleocurrent of the sample
图 5 样品LMS-01部分碎屑锆石CL图像
黄色数字为锆石年龄值；橙色数字为该锆石的Th/U值
Fig. 5. Cathode luminescence images of detrital zircons in the sample LMS-01
图 6 样品LMS-01碎屑锆石U-Pb年龄直方图以及谐和图
Fig. 6. Histogram diagram of all detrital zircons in sample LMS-01 and U-Pb concordia with Th/U diagram
图 7 恢复深部隐伏叠加断层转折褶皱后的地震剖面构造解释方案
Fig. 7. Interpretation of the structural section after restoration of the buried fault bend fold
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[1] Burchfiel, B.C., Chen, Z.L., Yupinc, L., et al., 1995. Tectonics of the Longmen Shan and Adjacent Regions, Central China. International Geology Review, 37(8): 661-735. https://doi.org/10.1080/00206819509465424 [2] Chen, W., Lu, H.F., Shi, Z.J., et al., 1993. Use of Forward Computation in Construction of Balanced Cross Section. Scientia Geologica Sinica, 28(2): 117-126 (in Chinese with English abstract). [3] Chen, W., Yang, K.M., Li, B.S., et al., 2009. The Geometric Simulation and Analysis of the Blind Growth Fold in the Frontier Overthrust Belt of the Southern Section of the Longmenshan during Late Triassic. Chinese Science Bulletin, 54(3): 382-386 (in Chinese). doi: 10.1360/csb2009-54-3-382 [4] Chen, Z.X., Jia, D., Wei, G.Q., et al., 2008. Characteristics of Thrust Structures in the Northern Longmenshan Front Belt. Acta Petrolei Sinica, 29(5): 657-662, 668 (in Chinese with English abstract). [5] Chen, Z.X., Jia, D., Zhang, Q., et al., 2005. Balanced Cross-Section Analysis of the Fold-Thrust Belt of the Longmen Mountains. Acta Geologica Sinica, 79(1): 38-45 (in Chinese with English abstract). [6] Dai, J.Q., 2011. Analysis on Structural Deformation Stages and Dynamic Genesis of Trust Belt in Longmen Mountain. Journal of Southwest Petroleum University, 33(2): 61-67 (in Chinese with English abstract). http://www.cqvip.com/QK/93402A/20112/37510191.html [7] Deng, S.Q., Hu, M., Yan, Q.B., et al., 2009. The Structural Pattern and Oil-Gas Exploration Direction of Northern Section of Longmen Mountain. Journal of Southwest Petroleum University, 31(4): 184-188 (in Chinese with English abstract). [8] Guo, Z.W., Deng, K.L., Han, Y.F., et al., 1996. The Formation and Development of Sichuan Basin. Geological Publishing House, Beijing, 209 (in Chinese with English abstract). [9] Jia, D., Wei, G. Q., Chen, Z. X., et al., 2006. Longmen Shan Fold-Thrust Belt and Its Relation to the Western Sichuan Basin in Central China: New Insights from Hydrocarbon Exploration. AAPG Bulletin, 90(9): 1425-1447. https://doi.org/10.1306/03230605076 [10] Jin, W.Z., Tang, L. J., Yang, K. M., et al., 2007. Deformation and Zonation of the Longmenshan Fold and Thrust Zone in the Western Sichuan Basin. Acta Geologica Sinica, 81(8): 1072-1080 (in Chinese with English abstract). http://www.cnki.com.cn/Article/CJFDTotal-DZXE200708007.htm [11] Li, P., Pei, X.Z., Li, R.B., et al., 2019. Zircon U-Pb Geochronology, Geochemistry and Geological Significance of Daan Granite in Northwestern Margin of Yangtze Block. Earth Science, 44(4): 1338-1356 (in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTotal-DQKX201904021.htm [12] Lisle, R. J., Leyshon, P. R., 2004. Stereographic Projection Techniques for Geologists and Civil Engineers. Cambridge University Press, Cambridge. https://doi.org/10.1017/cbo9781139171366 [13] Liu, Y. S., Hu, Z. C., Gao, S., et al., 2008. In Situ Analysis of Major and Trace Elements of Anhydrous Minerals by LA-ICP-MS without Applying an Internal Standard. Chemical Geology, 257(1-2): 34-43. https://doi.org/10.1016/j.chemgeo.2008.08.004 [14] Ludwig, K.R., 2008. ISOPLOT 3.6: A Geochronological Toolkit for Microsoft Excel. Berkeley Geochronology Center, Berkeley, 4. [15] Luo, L., Qi, J. F., Zhang, M. Z., et al., 2014. Detrital Zircon U-Pb Ages of Late Triassic-Late Jurassic Deposits in the Western and Northern Sichuan Basin Margin: Constraints on the Foreland Basin Provenance and Tectonic Implications. International Journal of Earth Sciences, 103(6): 1553-1568. https://doi.org/10.1007/s00531-014-1032-7 [16] Ma, Y.W., Wang, G.Z., Hu, X.W., 1996. Tectonic Deformation of Pengguan Complex as a Nappe. Acta Geologica Sichuan, 16(2): 110-114 (in Chinese with English abstract). [17] Robert, A., Pubellier, M., de Sigoyer, J., et al., 2010. Structural and Thermal Characters of the Longmen Shan (Sichuan, China). Tectonophysics, 491(1-4): 165-173. https://doi.org/10.1016/j.tecto.2010.03.018 [18] Shao, T. B., Cheng, N. F., Song, M. S., 2016. Provenance and Tectonic-Paleogeographic Evolution: Constraints from Detrital Zircon U-Pb Ages of Late Triassic-Early Jurassic Deposits in the Northern Sichuan Basin, Central China. Journal of Asian Earth Sciences, 127: 12-31. https://doi.org/10.1016/j.jseaes.2016.05.027 [19] Shaw, J., Connors, C., Suppe, J., 2005. Seismic Interpretation of Contractional Fault-Related Folds: An AAPG Seismic Atlas Studies in Geology #53. The American Association of Petroleum Geologists, Tulsa, 11-25. https://doi.org/10.1306/st531003 [20] Shen, C. B., Ge, X., Bai, X. J., 2019. Re-Os Geochronology Constraints on the Neoproterozoic-Cambrian Hydrocarbon Accumulation in the Sichuan Basin. Earth Science, 44(3): 713-726 (in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTotal-DQKX201903003.htm [21] Sun, X. M., Du, J.Y., Shan, X. L., et al., 2010. Tectonic Zonation of Front Range and Deformation Features of Foreland in Northern Longmen Mountain Thrust Zone. Journal of Jilin University (Earth Science Edition), 40(6): 1323-1332 (in Chinese with English abstract). [22] Suppe, J., 1983. Geometry and Kinematics of Fault-Bend Folding. American Journal of Science, 283(7): 684-721. https://doi.org/10.2475/ajs.283.7.684 [23] Wang, J.Q., 2003. Recognition on the Main Episode of Indo-China Movement in the Longmen Mountains—A Review on the Anxian Tectonic Movement. Acta Geologica Sichuan, 23(2): 65-69 (in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-SCDB200302000.htm [24] Wang, Z.C., Zhao, W.Z., Zhang, L., et al., 2002. Structural Sequence and Natural Gas Exploration in Sichuan Basin. Geological Publishing House, Beijing (in Chinese). [25] Yan, D. P., Zhou, M. F., Wei, G. Q., et al., 2008. The Pengguan Tectonic Dome of Longmen Mountains, Sichuan Province: Mesozoic Denudation of a Neoproterozoic Magmatic Arc-Basin System. Science China Earth Sciences, 51(11): 1545-1559. https://doi.org/10.1007/s11430-008-0126-0 [26] Yong, L., 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. https://doi.org/10.1046/j.1365-2117.2003.00197.x [27] Zhang, L. Y., Ding, L., Pullen, A., et al., 2014. Age and Geochemistry of Western Hoh-Xil-Songpan-Ganzi Granitoids, Northern Tibet: Implications for the Mesozoic Closure of the Paleo-Tethys Ocean. Lithos, 190-191: 328-348. doi: 10.1016/j.lithos.2013.12.019 [28] Zhang, Y., Jia, D., Shen, L., et al., 2015. Provenance of Detrital Zircons in the Late Triassic Sichuan Foreland Basin: Constraints on the Evolution of the Qinling Orogen and Longmen Shan Thrust-Fold Belt in Central China. International Geology Review, 57(14): 1806-1824. https://doi.org/10.1080/00206814.2015.1027967 [29] Zhang, Z. J., Yuan, X. H., Chen, Y., et al., 2010. Seismic Signature of the Collision between the East Tibetan Escape Flow and the Sichuan Basin. Earth and Planetary Science Letters, 292(3-4): 254-264. https://doi.org/10.1016/j.epsl.2010.01.046 [30] Zheng, R.C., Zhu, R.K., Zhai, W.L., et al., 2008. Tectonic Evolution and Sequence Filling Patterns in the Western Sichuan Foreland-Like Basin in the Upper Triassic Xujiahean Period. Geology in China, 35(2): 246-255 (in Chinese with English abstract). [31] Zhu, M., Chen, H. L., Zhou, J., et al., 2017. Provenance Change from the Middle to Late Triassic of the Southwestern Sichuan Basin, Southwest China: Constraints from the Sedimentary Record and Its Tectonic Significance. Tectonophysics, 700-701: 92-107. https://doi.org/10.1016/j.tecto.2017.02.006 [32] 陈伟, 卢华复, 施泽进, 等, 1993. 平衡剖面的正演计算及其应用. 地质科学, 28(2): 117-126. [33] 陈伟, 杨克明, 李书兵, 等, 2009. 龙门山南段山前印支晚期隐伏生长褶皱的构造几何模拟与分析. 科学通报, 54(3): 382-386. https://www.cnki.com.cn/Article/CJFDTOTAL-KXTB200903020.htm [34] 陈竹新, 贾东, 魏国齐, 等, 2008. 龙门山北段冲断前锋构造带特征. 石油学报, 29(5): 657-662, 668. doi: 10.3321/j.issn:0253-2697.2008.05.005 [35] 陈竹新, 贾东, 张惬, 等, 2005. 龙门山前陆褶皱冲断带的平衡剖面分析. 地质学报, 79(1): 38-45. doi: 10.3321/j.issn:0001-5717.2005.01.005 [36] 戴建全, 2011. 龙门山冲断带构造变形期次及动力学成因. 西南石油大学学报(自然科学版), 33(2): 61-67. doi: 10.3863/j.issn.1674-5086.2011.02.009 [37] 邓绍强, 胡明, 颜其彬, 等, 2009. 龙门山北段构造模式及油气勘探方向. 西南石油大学学报(自然科学版), 31(4): 184-188. doi: 10.3863/j.issn.1674-5086.2009.04.041 [38] 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, 209. [39] 金文正, 汤良杰, 杨克明, 等, 2007. 川西龙门山褶皱冲断带分带性变形特征. 地质学报, 81(8): 1072-1080. doi: 10.3321/j.issn:0001-5717.2007.08.007 [40] 栗朋, 裴先治, 李瑞保, 等, 2019. 扬子板块西北缘大安花岗岩体锆石U-Pb年代学、地球化学特征及其地质意义. 地球科学, 44(4): 1338-1356. doi: 10.3799/dqkx.2018.163 [41] 马永旺, 王国芝, 胡新伟, 1996. "彭灌杂岩"推覆体的构造变形特征. 四川地质学报, 16(2): 110-114. https://www.cnki.com.cn/Article/CJFDTOTAL-SCDB602.004.htm [42] 沈传波, 葛翔, 白秀娟, 2019. 四川盆地震旦-寒武系油气成藏的Re-Os年代学约束. 地球科学, 44(3): 713-726. doi: 10.3799/dqkx.2018.383 [43] 孙晓猛, 杜继宇, 单玄龙, 等, 2010. 龙门山冲断带北段前山带构造分带性及山前带变形特征. 吉林大学学报(地球科学版), 40(6): 1323-1332. https://www.cnki.com.cn/Article/CJFDTOTAL-CCDZ201006016.htm [44] 王金琪, 2003. 龙门山印支运动主幂辨析: 再论安县构造运动. 四川地质学报, 23(2): 65-69. doi: 10.3969/j.issn.1006-0995.2003.02.001 [45] 汪泽成, 赵文智, 张林, 等, 2002. 四川盆地构造层序与天然气勘探. 北京: 地质出版社. [46] 郑荣才, 朱如凯, 翟文亮, 等, 2008. 川西类前陆盆地晚三叠世须家河期构造演化及层序充填样式. 中国地质, 35(2): 246-255. doi: 10.3969/j.issn.1000-3657.2008.02.007 -
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