Discovery and Its Geological Significance of Retrograde Eclogite in Jinshajiang Suture Zone in Ludian Area of West Yunnan Province
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摘要: 在滇西鲁甸地区金沙江结合带新发现退变榴辉岩，其在野外呈透镜体状产于石榴子石白云母石英片岩中.利用电子探针及激光拉曼分析发现石榴子石和锆石中残留绿辉石包体.石榴子石及基质中的白云母为多硅白云母(Si(p.f.u)=3.27~3.53)，指示岩石经历了高压变质作用过程.石榴子石发育进变质生长成分环带.岩相学及矿物化学特征显示，退变榴辉岩大致经历了进变质角闪岩相、峰期榴辉岩相、早期退变质以及晚期强退变这4个世代矿物组合，各阶段典型的矿物组合依次为Grt+AmpI+Qtz、Grt+Omp+Rt+Qtz+Phe、Pl+Di+AmpⅡ+Ilm+Spn+Qtz、AmpⅢ+Pl+Czo+Ilm+Qtz.该新发现对金沙江结合带复杂的变质演化P-T-t轨迹样式及年代格架、以金沙江洋为代表的整个西南三江地区古特提斯洋-陆俯冲-碰撞-造山的复杂构造演化历史以及微陆块的拼贴机制等关键科学问题的解决提供了极为重要的素材和更多的约束，具有重要的科学意义.Abstract: Retrograde eclogite was newly discovered in Jinshajiang suture zone in Ludian area of West Yunnan Province,which occurs as lenses in garnet muscovite quartz schist. The EPMA and LRS analyses reveal that there were residual omphacite inclusions in garnet and zircon. The muscovites developed in garnet and matrix are phengite(Si(p.f.u)=3.27-3.53),indicating that the rock has undergone a high pressure process of metamorphism. Garnets in this rock have preserved prograde metamorphic zonation. Petrographic and mineral chemical characteristics indicate that the retrograde eclogite has roughly undergone 4 generations of mineral assemblages including the progressive amphibolite facies mineral assemblage,the peak phase eclogite facies mineral assemblage,the early retrograde metamorphic mineral assemblage and the late strongly retrograde mineral assemblage. The typical paragenetic association of minerals of each stage is Grt+AmpI+Qtz,Grt+Omp+Rt+Qtz+Phe,Pl+Di+AmpⅡ+Ilm+Spn+Qtz,AmpⅢ+Pl+Czo+Ilm+Qtz,respectively. These new findings will provide important evidences and more restraints to the key scientific problems such as the complex P-T-t path style of metamorphic evolution and chronostratigraphic framework in Jinshajiang suture zone,the complex tectonic evolution history of Paleo-Tethys ocean of subduction,collision,orogenesis,and the collage mechanism of microcontinent and so on. It has important scientific significance.
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Key words:
- Jinshajiang suture zone /
- omphacite /
- petrography /
- mineral chemistry /
- retrograde eclogite /
- West Yunnan Province /
- Ludian area
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图 1 滇西鲁甸地区构造简图(a)和退变质榴辉岩出露区地质简图(b)
图b据Wang et al. (2014)修改.I.雀儿山-稻城火山岩浆弧; II.甘孜-理塘结合带; III.中咱-香格里拉地块; IV.金沙江-哀牢山结合带; V.江达-维西火山岩浆弧; VI.昌都-兰坪-普洱地块; VII.保山-镇康地块; VIII.类乌齐-左贡变质地块; IX.冈底斯-腾冲火山岩浆弧; X.印度地块; XI.察隅-盈江火山岩浆弧; XII.开心岭-竹卡火山岩浆弧
Fig. 1. Structure diagram (a) and geological sketch map of retrograde eclogite (b) in Ludian area of West Yunnan Province
图 2 滇西鲁甸地区退变榴辉岩野外、显微结构及矿物组合特征
Omp.绿辉石；Di.透辉石；Qtz.石英；Amp.角闪石；Grt.石榴子石；Pl.斜长石；Ilm.钛铁矿；Spn.榍石；Rt.金红石；Czo.斜黝帘石；Ap.凝灰石；Ep.绿帘石；Chl.绿泥石；Phe.多硅白云母
Fig. 2. The field occurrence, microstructure and mineral assemblage characteristics of retrograde eclogite in Ludian area of West Yunnan Province
图 3 滇西鲁甸地区退变榴辉岩矿物组合背散射特征
矿物代号同图 2
Fig. 3. The RBS characteristics of mineral assemblages of retrograde eclogite in Ludian area of West Yunnan Province
图 4 滇西鲁甸地区退变榴辉岩锆石中绿辉石(a)和金红石(b)包裹体激光拉曼光谱特征
矿物代号同图 2
Fig. 4. The LRS characteristics of omphacite (a) and rutile (b) inclusion in zircon of retrograde eclogite in Ludian area of West Yunnan Province
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Chen, D. L., Ren, Y. F., Gong, X. K., et al., 2015. Identification and Its Geological Significance of Eclogite in Songshugou, the North Qinling. Acta Petrologica Sinica, 31(7):1841-1854 (in Chinese with English abstract). Ji, J.Q., Zhong, D.L., Chen, C.Y., 2000. Geochemistry and Genesis of Nabang Metamorphic Basalt, Southwest Yunnan, China:Implications for the Subducted Slab Break-off. Acta Petrologica Sinica, 16(3):433-442 (in Chinese with English abstract). Jian, P., Liu, D. Y., Kröner, A., et al., 2009. Devonian to Permian Plate Tectonic Cycle of the Paleo-Tethys Orogen in Southwest China (Ⅱ):Insights from Zircon Ages of Ophiolites, Arc/Back-Arc Assemblages and Within-Plate Igneous Rocks and Generation of the Emeishan CFB Province. Lithos, 113(3-4):767-784. https://doi.org/10.1016/j.lithos.2009.04.006 Lai, S. C., Qin, J. F., Li, X. J., et al., 2010. Geochemistry and Sr-Nd-Pb Isotopic Features of the Ganlongtang-Nongba Ophiolite from the Changning-Menglian Suture Zone. Acta Petrologica Sinica, 26(11):3195-3205 (in Chinese with English abstract). Li, B.L., Ji, J.Q., Fu, X.Y., et al., 2009. Metamorphic Time Limits' Study on the Metamorphic Rocks Series of Ailao Shan-Diancang Mountain Ranges, West Yunnan. Acta Petrologica Sinica, 25(3):595-608 (in Chinese with English abstract). http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=ysxb98200903012 Li, C., Zhai, Q. G., Dong, Y. S., et al., 2009. High-Pressure Eclogite-Blueschist Metamorphic Belt and Closure of Paleo-Tethys Ocean in Central Qiangtang, Qinghai-Tibet Plateau. Journal of Earth Science, 20(2):209-218. https://doi.org/10.1007/s12583-009-0021-4 Li, J., Sun, Z.B., Xu, G.X., et al., 2015. Firstly Discovered Garnet-Amphibolite from Mengku Area, Shuangjiang County, Western Yunnan Province, China. Acta Mineralogica Sinica, 35(4):421-424 (in Chinese with English abstract). http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=kwxb201504001 Liu, F.L., Xue, H.M., Xu, Z.Q., et al., 2006. SHRIMP U-Pb Zircon Dating from Eclogite Lens in Marble, Shuanghe Area, Dabie UHP Terrane:Restriction on the Prograde, UHP and Retrograde Metamorphic Ages. Acta Petrologica Sinica, 22(7):1761-1778 (in Chinese with English abstract). Pan, G.T., Wang, L.Q., Li, R.S., et al., 2012. Tectonic Model of Archipelagic Arc-Basin Systems:The Key to the Continental Geology. Sedimentary Geology and Tethyan Geology, 32(3):1-20 (in Chinese with English abstract). Pan, G.T., Wang, L.Q., Li, X.Z., et al., 2001. The Tectonic Framework and Spatial Allocation of the Archipelagic Arc-Basin Systems on the Qinghai-Xizang Plateau. Sedimentary Geology and Tethyan Geology, 21(3):1-26 (in Chinese with English abstract). http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=yxgdl200103001 Qi, X.X., Zhu, L.H., Li, H.Q., et al., 2010. Zircon LA-ICP-MS U-Pb Dating for Mylonitized Granite from the Ailaoshan-Jinshajiang Tectonic Zone in the Eastern Qinghai-Tibet Plateau and Its Tectonic Significance. Acta Geologica Sinica, 84(3):357-369 (in Chinese with English abstract). http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=dizhixb201003005 Tang, Y., Qin, Y. D., Gong, X. D., et al., 2020. Discovery of Eclogites in Jinsha River Suture Zone, Gonjo County, Eastern Tibet and Its Restriction on Paleo-Tethyan Evolution. China Geology, 3(1):83-103. https://doi.org/10.31035/cg2020003 Wang, B. D., Wang, L. Q., Chen, J. L., et al., 2014. Triassic Three-Stage Collision in the Paleo-Tethys:Constraints from Magmatism in the Jiangda-Deqen-Weixi Continental Margin Arc, SW China. Gondwana Research, 26(2):475-491. https://doi.org/10.1016/j.gr.2013.07.023 Wang, B.D., Wang, L.Q., Qiangba, Z.X., et al., 2011. Early Triassic Collision of Northern Lancangjiang Suture:Geochronological, Geochemical and Hf Isotope Evidences from the Granitic Gneiss in Leiwuqi Area, East Tibet. Acta Petrologica Sinica, 27(9):2752-2762 (in Chinese with English abstract). Wang, B.D., Wang, L.Q., Wang, D.B., et al., 2018. Tectonic Evolution of the Changning-Menglian Proto-Paleo Tethys Ocean in the Sanjiang Area, Southwestern China. Earth Science, 43(8):2527-2550 (in Chinese with English abstract). http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=dqkx201808001 Wang, D.B., Wang, L.Q., Yin, F.G., et al., 2012. Timing and Nature of the Jinshajiang Paleo-Tethys:Constraints from Zircon U-Pb Age and Hf Isotope of the Dongzhulin Layered Gabbro from Jinshajiang Ophiolite Belt, Northwestern Yunnan. Acta Petrologica Sinica, 28(5):1542-1550 (in Chinese with English abstract). Wang, F., Liu, F.L., Xue, H.M., et al., 2011. Geochemical Characteristics of Amphibole-Bearing Metamorphic Rocks in Sanjiang Region, Southeastern Tibetan Plateau. Acta Petrologica et Mineralogica, 30(5):844-852 (in Chinese with English abstract). http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=yskwxzz201105008 Wang, L.Q., Pan, G.T., Ding, J., et al., 2013. The Geological Map and Instruction of the Qinghai-Tibet Plateau and Its Adjacent Areas (1:1 500 000). Geological Publishing House, Beijing (in Chinese). Wang, L.Q., Pan, G.T., Li, D.M., et al., 1999. The Spatio-Temporal Framework and Geological Evolution of the Jinshajiang Arc-Basin Systems. Acta Geologica Sinica, 73(3):206-218 (in Chinese with English abstract). http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=QK199900084696 Wang, L.Q., Pan, G.T., Li, D.M., et al., 2000. The Evolution and Mineralization of the Jomda-Weixi Continental Marginal Volcanic Arc, Southwestern China. Sedimentary Geology and Tethyan Geology, 20(2):1-17 (in Chinese with English abstract). http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=yxgdl200002001 Wang, M.L., Zhang, J.G., Wang, X.W., 2016. LA-ICP-MS Zircon U-Pb Dating of the Metamorphic Rocks in the Ailaoshan Tectonic Belt, Western Yunnan, and Its Geological Implications. Geological Bulletin of China, 35(5):738-749 (in Chinese with English abstract). http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=zgqydz201605010 Wang, Q.Y., Mou, C.L., He, J., et al., 2018. Provenance Analysis and Tectonic Setting Judgment in Shanglan Formation of Middle Triassic in Weixi Area. Earth Science, 43(8):2811-2832 (in Chinese with English abstract). http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=dqkx201808020 Yang, D.T., Wang, Y.B., Han, J., et al., 2013. LA-MC-ICP-MS U-Pb Zircon Dating of the Metamorphic Rocks from Geyading-Maoding Area, Jinsha Suture, Northwestern Yunnan Province:Depositional Ages of Protoliths and Provenance Characteristics. Geological Review, 59(6):1131-1142 (in Chinese with English abstract). Yang, J.S., Xu, Z.Q., Geng, Q.R., et al., 2006. A Possible New HP/UHP (?) Metamorphic Belt in China:Discovery of Eclogite in the Lasha Terrane, Tibet. Acta Geologica Sinica, 80(12):1783-1792 (in Chinese with English abstract). Yu, J.H., Wang, L.J., Wei, Z.Y., et al., 2007. Phanerozoic Metamorphic Episodes and Characteristics of Cathaysia Block. Geological Journal of China Universities, 13(3):474-483 (in Chinese with English abstract). http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=gxdzxb200703016 Zhai, M.G., Guo, J.H., Li, J.H., et al., 1995. Discovery and Implication of Retrometamorphic Eclogite in Archean Eon in North China. Chinese Science Bulletin, 40(17):1590-1594 (in Chinese). doi: 10.1360/csb1995-40-17-1590 Zhang, R. Y., Lo, C. H., Chung, S. L., et al., 2013. Origin and Tectonic Implication of Ophiolite and Eclogite in the Song Ma Suture Zone between the South China and Indochina Blocks. Journal of Metamorphic Geology, 31(1):49-62. https://doi.org/10.1111/jmg.12012 陈丹玲, 任云飞, 宫相宽, 等, 2015.北秦岭松树沟榴辉岩的确定及其地质意义.岩石学报, 31(7):1841-1854. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=ysxb98201507003 季建清, 钟大赉, 陈昌勇, 2000.滇西南那邦变质基性岩地球化学与俯冲板片裂离.岩石学报, 16(3):433-442. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=ysxb98200003017 赖绍聪, 秦江锋, 李学军, 等, 2010.昌宁-孟连缝合带干龙塘-弄巴蛇绿岩地球化学及Sr-Nd-Pb同位素组成研究.岩石学报, 26(11):3195-3205. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=ysxb98201011004 李宝龙, 季建清, 付孝悦, 等, 2009.滇西点苍山-哀牢山变质岩系变质时限研究.岩石学报, 25(3):595-608. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=ysxb98200903012 李静, 孙载波, 徐桂香, 等, 2015.滇西双江县勐库地区榴闪岩的发现与厘定.矿物学报, 35(4):421-424. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=kwxb201504001 刘福来, 薛怀民, 许志琴, 等, 2006.大别超高压变质带的进变质、超高压和退变质时代的准确限定:以双河大理岩中榴辉岩锆石SHRIMP U-Pb定年为例.岩石学报, 22(7):1761-1778. 潘桂棠, 王立全, 李荣社, 等, 2012.多岛弧盆系构造模式:认识大陆地质的关键.沉积与特提斯地质, 32(3):1-20. 潘桂棠, 王立全, 李兴振, 等, 2001.青藏高原区域构造格局及其多岛弧盆系的空间配置.沉积与特提斯地质, 21(3):1-26. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=yxgdl200103001 戚学祥, 朱路华, 李化启, 等, 2010.青藏高原东缘哀牢山-金沙江构造带糜棱状花岗岩的LA-ICP-MS U-Pb定年及其构造意义.地质学报, 84(3):357-369. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=dizhixb201003005 王保弟, 王立全, 强巴扎西, 等, 2011.早三叠世北澜沧江结合带碰撞作用:类乌齐花岗质片麻岩年代学、地球化学及Hf同位素证据.岩石学报, 27(9):2752-2762. 王保弟, 王立全, 王冬兵, 等, 2018.三江昌宁-孟连带原-古特提斯构造演化.地球科学, 43(8):2527-2550. doi: 10.3799/dqkx.2018.160 王冬兵, 王立全, 尹福光, 等, 2012.滇西北金沙江古特提斯洋早期演化时限及其性质:东竹林层状辉长岩锆石U-Pb年龄及Hf同位素约束.岩石学报, 28(5):1542-1550. 王舫, 刘福来, 薛怀民, 等, 2011.青藏高原东南缘"三江"地区含角闪石变质岩石的地球化学特征.岩石矿物学杂志, 30(5):844-852. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=yskwxzz201105008 王立全, 潘桂棠, 丁俊, 等, 2013.青藏高原及邻区地质图及说明书(1:1 500 000).北京:地质出版社. 王立全, 潘桂棠, 李定谋, 等, 1999.金沙江弧-盆系时空结构及地史演化.地质学报, 73(3):206-218. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=QK199900084696 王立全, 潘桂棠, 李定谋, 等, 2000.江达-维西陆缘火山弧的形成演化及成矿作用.沉积与特提斯地质, 20(2):1-17. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=yxgdl200002001 王明亮, 张加桂, 汪新文, 2016.滇西哀牢山构造带变质岩系LA-ICP-MS锆石U-Pb年龄及其地质意义.地质通报, 35(5):738-749. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=zgqydz201605010 王启宇, 牟传龙, 贺娟, 等, 2018.维西地区中三叠统上兰组物源分析及构造背景判断.地球科学, 43(8):2811-2832. doi: 10.3799/dqkx.2018.307 杨德庭, 王彦斌, 韩娟, 等, 2013.滇西北金沙江缝合带格亚顶-茂顶地区变质岩系的锆石LA-MC-ICP-MS U-Pb年龄:原岩的沉积时代和物源区特征.地质论评, 59(6):1131-1142. 杨经绥, 许志琴, 耿全如, 等, 2006.中国境内可能存在一条新的高压/超高压(?)变质带:青藏高原拉萨地体中发现榴辉岩带.地质学报, 80(12):1783-1792. 于津海, 王丽娟, 魏震洋, 等, 2007.华夏地块显生宙的变质作用期次和特征.高校地质学报, 13(3):474-483. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=gxdzxb200703016 翟明国, 郭敬辉, 李江海, 等, 1995.华北太古宙退变质榴辉岩的发现及其含义.科学通报, 40(17):1590-1594. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=kxtb199517016 -
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