滇西地区临沧花岗岩成因及地质意义
Genesis and Geological Significance of Lincang Granite in Western Yunnan
摘要: 三江地区临沧花岗岩基是研究古特提斯洋俯冲和闭合的关键所在，然而其岩浆成因和构造属性一直存在较大的争议，严重制约了我们对古特提斯洋与保山地块和思茅地块构造耦合关系的认识。本文对临沧花岗岩基的总体侵位时代、构造背景及侵位驱动机制进行了讨论。在上述基础上提出临沧晚三叠世花岗岩形成于思茅地块与保山地块的后碰撞伸展阶段，板片断离是这一岩浆活动的驱动机制，为古特提斯洋闭合时间提供了新的约束。
Abstract: The Lincang granite foundation in Sanjiang area is the key to the study of the subduction and closure of the ancient Tethys Ocean. However, its magmatic origin and tectonic properties have been greatly disputed, which seriously restricts our understanding of the structural coupling relationship between the Ancient Tethys Ocean and the Baoshan Block and the Simao Block. This paper discusses the overall emplacement age, tectonic setting and emplacement driving mechanism of Lincang granite base. On the basis of the above, it is proposed that the Late Triassic granite in Lincang was formed in the post-collision extension stage of Simao Block and Baoshan Block, and the Slab break-off is the driving mechanism of this magmatic activity, which provides a new constraint for the closing time of the ancient Tethys Ocean.
文章引用：陈开煌. 滇西地区临沧花岗岩成因及地质意义[J]. 地球科学前沿, 2024, 14(12): 1489-1496. https://doi.org/10.12677/ag.2024.1412139

参考文献

[1] Brown, M. (2013) Granite: From Genesis to Emplacement. Geological Society of America Bulletin, 125, 1079-1113. [Google Scholar] [CrossRef] 
[2] 肖倩茹. 滇西临沧花岗岩时空格架与岩石序列及成因[D]: [博士学位论文]. 成都: 成都理工大学, 2019.
[3] Hennig, D., Lehmann, B., Frei, D., Belyatsky, B., Zhao, X.F., Cabral, A.R., et al. (2009) Early Permian Seafloor to Continental Arc Magmatism in the Eastern Paleo-Tethys: U-Pb Age and Nd-Sr Isotope Data from the Southern Lancangjiang Zone, Yunnan, China. Lithos, 113, 408-422. [Google Scholar] [CrossRef] 
[4] Deng, J., Wang, C., Zi, J., Xia, R. and Li, Q. (2018) Constraining Subduction-Collision Processes of the Paleo-Tethys along the Changning-Menglian Suture: New Zircon U-Pb Ages and Sr-Nd-Pb-Hf-O Isotopes of the Lincang Batholith. Gondwana Research, 62, 75-92. [Google Scholar] [CrossRef] 
[5] Wang, C., Li, G., Liu, Z., Liu, J., Xu, Z. and Li, W. (2024) Spatio-Temporal Variations of Late Triassic Granitic Magmatism in the Lincang Batholith and Implications for Post-Collisional Process along the Paleo-Tethys Suture in SW China. International Geology Review, 66, 3141-3161. [Google Scholar] [CrossRef] 
[6] Wang, H., Liu, F., Li, J., Sun, Z., Ji, L., Tian, Z., et al. (2018) Petrology, Geochemistry and p-t-t Path of Lawsonite‐bearing Retrograded Eclogites in the Changning-Menglian Orogenic Belt, Southeast Tibetan Plateau. Journal of Metamorphic Geology, 37, 439-478. [Google Scholar] [CrossRef] 
[7] Wu, H., Li, C., Chen, J. and Xie, C. (2015) Late Triassic Tectonic Framework and Evolution of Central Qiangtang, Tibet, SW China. Lithosphere, 8, 141-149. [Google Scholar] [CrossRef] 
[8] 丁林, 钟大赉. 滇西昌宁-孟连带古特提斯洋硅质岩稀土元素和铈异常特征[J]. 中国科学(B辑∙化学∙生命科学∙地学), 1995(1): 93-100.
[9] 王保弟, 王立全, 王冬兵, 等. 三江昌宁-孟连带原-古特提斯构造演化[J]. 地球科学, 2018, 43(8): 2527-2550.
[10] 甘正勤. 昌宁-孟连特提斯洋演化研究——来自地层学和沉积学约束[D]: [博士学位论文]. 北京: 中国地质大学, 2023.
[11] Peng, T., Wilde, S.A., Wang, Y., Fan, W. and Peng, B. (2013) Mid-Triassic Felsic Igneous Rocks from the Southern Lancangjiang Zone, SW China: Petrogenesis and Implications for the Evolution of Paleo-Tethys. Lithos, 168, 15-32. [Google Scholar] [CrossRef] 
[12] 苑新晨, 杨启军, 吕勇, 潘明, 高爱洋, 徐放. 滇西昌宁-孟连古特提斯闭合的岩浆活动响应——来自临沧岩体南段花岗岩的地质地球化学证据[J]. 地质通报, 2021, 40(1): 125-137.
[13] 范蔚茗, 彭头平, 王岳军. 滇西古特提斯俯冲-碰撞过程的岩浆作用记录[J]. 地学前缘, 2009, 16(6): 291-302.
[14] Whalen, J.B., Currie, K.L. and Chappell, B.W. (1987) A-Type Granites: Geochemical Characteristics, Discrimination and Petrogenesis. Contributions to Mineralogy and Petrology, 95, 407-419. [Google Scholar] [CrossRef] 
[15] Eby, G.N. (1992) Chemical Subdivision of the A-Type Granitoids: Petrogenetic and Tectonic Implications. Geology, 20, 641-644. [Google Scholar] [CrossRef] 
[16] Huang, K. and Opdyke, N.D. (2016) Paleomagnetism of the Upper Triassic Rocks from South of the Ailaoshan Suture and the Timing of the Amalgamation between the South China and the Indochina Blocks. Journal of Asian Earth Sciences, 119, 118-127. [Google Scholar] [CrossRef] 
[17] 从柏林, 吴根耀, 张旗, 等. 中国滇西古特提斯构造带岩石大地构造演化[J]. 中国科学(B辑∙化学∙生命科学∙地学), 1993(11): 1201-1207.
[18] 方念乔, 刘本培, 冯庆来. 滇西南牡音河组的沉积特征、环境意义及与之相关的若干地质问题[J]. 地球科学, 1996(1): 14-21+117.
[19] 王慧宁. 昌宁-孟连造山带榴辉岩、蓝片岩和变沉积岩的岩石学、变质演化及其对古特提斯洋-陆俯冲造山的制约[D]: [博士学位论文]. 北京: 中国地质科学院, 2020.
[20] Wu, H., Liu, X., Chen, J., Li, C., Yang, R. and Jiang, Z. (2023) Tectono-Magmatic Response to the Geometric Evolution of Slab Breakoff in the Paleo-Tethys Ocean: Constraints from Late Triassic Granites in the Qiangtang Block, Northern Tibet. GSA Bulletin, 136, 447-460. [Google Scholar] [CrossRef] 
[21] van den Beukel, J. (1992) Some Thermomechanical Aspects of the Subduction of Continental Lithosphere. Tectonics, 11, 316-329. [Google Scholar] [CrossRef] 
[22] Von Blanckenburg, F. and Davies, J.H. (1995) Slab Breakoff: A Model for Syncollisional Magmatism and Tectonics in the Alps. Tectonics, 14, 120-131. [Google Scholar] [CrossRef] 
[23] Huang, X., Dou, J., Wu, G., He, J., Siebel, W. and Chen, F. (2021) Source Rocks Control the Geochemical Diversity of Granite: The Lincang Pluton in the Western Yunnan Tethyan Belt, SW China. Lithos, 382-383, Article ID: 105950. [Google Scholar] [CrossRef] 
[24] 曾文涛, 孙载波, 周坤, 等. 滇西双江县勐库地区临沧花岗岩中暗色包体锆石U-Pb年代学及其地质意义[J]. 沉积与特提斯地质, 2018, 38(1): 23-36.
[25] Zhao, F., Li, G., Wang, Q. and Xue, S. (2021) Discovery of Multi-Crustal Rejuvenations for the Formation of the Lincang Granitic Batholith, Southwest China: Magmatism Relating to Changning-Menglian Paleo-Tethyan Termination. International Geology Review, 64, 970-986. [Google Scholar] [CrossRef]