赣南沙地花岗岩体LA-ICP-MS锆石U-Pb年龄、地球化学特征及构造意义
LA-ICP-MS Zircon U-Pb Ages and Geochemical Characteristics of the Shadi Granitic Pluton in Southern Jiangxi and Their Tectonic Significance
DOI: 10.12677/AG.2017.73045, PDF, HTML, XML, 下载: 1,682  浏览: 3,935  国家科技经费支持
作者: 罗春林, 刘高峰：江西省地质调查研究院，江西 南昌
关键词: LA-ICP-MS锆石U-Pb定年；地球化学；S型花岗岩；加里东运动；沙地花岗岩体；赣南；LA-ICP-MS Zircon U-Pb Dating； Geochemistry； S-Type Granite； Caledonian Movement； Shadi Granitic Pluton； Southern Jiangxi
摘要: 本文对赣南沙地地区沙地花岗岩体中的正长花岗岩进行了LA-ICP-MS锆石U-Pb定年、岩石学和地球化学研究。结果表明：正长花岗岩锆石U-Pb年龄为428.3 ± 5.9Ma，表明沙地花岗岩体形成于早志留世；地球化学特征显示：沙地花岗岩体的铝饱和指数为1.07~1.19, K2O/Na2O为1.07~1.73，属过铝质岩石；稀土元素总量为(169~244) × 10−6，轻稀土元素富集，稀土配分模式呈明显的右倾型；δEu为0.10~0.40，Eu亏损中等偏高；岩体中Rb、Th、U、La、Ce、Nd、Zr、Hf及Sm相对富集，Ba、Sr及Ti相对亏损；岩体Rb/Sr为2.90~7.28，平均值为5.12，明显高于大陆地壳平均值和上地壳平均值，具壳源花岗岩特征。沙地花岗岩体形成于早古生代晚期的加里东构造运动，是华夏地块与扬子地块在新元古代碰撞拼贴之后发生裂解，在奥陶纪至志留纪上地壳部分熔融形成的S型花岗质岩浆，在碰撞到后碰撞过渡期上升至上地壳形成的花岗岩体。
Abstract: This study conducted analysis on the Shadi granitic pluton in the Shadi area, southern Jiangxi Province using LA-ICP-MS zircon U-Pb dating, petrological and geochemical methods. The results show that the zircon U-Pb ages of the positive long granite in the studied areas are 428.3 ± 5.9 Ma, indicating the Shadi granitic pluton formed in Early Silurian. Geochemical result shows that the Shadi granitic pluton has ACNK of 1.07 - 1.19 and K2O/Na2O of 1.07 - 1.73, suggesting that they belong to peraluminous rock. The pluton has a total REE content of (169 - 244) × 10−6, and is enriched in LREE, with distinct right oblique REE patterns, Eu values of 0.10 to 0.40 and obvious negative Eu anomaly. The REE analysis shows the pluton is enriched in Rb, Th, U, La, Ce, Nd, Zr, Hf and Sm, and depleted in Ba, Sr and Ti, with Rb/Sr ratio of 2.90 - 7.28 (averaging 5.12) obviously higher than the average values of continental crust and the upper crust, suggesting that the pluton is of the characteristics of crust derived granite. The Shadi granite pluton might result from the Caledonian movement of late Early Paleozoic, and broke up after collision matching between Cathaysian land mass and Yangtze land mass. S-type granitic magmas, formed by partial melting of the upper crust in the period of Ordovician to Silurian, ascended to the upper crust and yielded the Shadi granite pluton in the period of collision to post-collision.
文章引用：罗春林, 刘高峰. 赣南沙地花岗岩体LA-ICP-MS锆石U-Pb年龄、地球化学特征及构造意义[J]. 地球科学前沿, 2017, 7(3): 411-422. https://doi.org/10.12677/AG.2017.73045

参考文献

[1] 徐克勤, 刘英俊, 等. 江西南部加里东期花岗岩的发现[J]. 地质论评, 1960, 20(3): 112-114.
[2] 孙涛. 新编华南花岗岩分布图及其说明[J]. 地质通报, 2006, 25(3): 332-335.
[3] 张菲菲, 王岳军, 范蔚茗, 等. 湘东–赣西地区早古生代晚期花岗岩体的LA-ICP-MS锆石U-Pb定年研究[J]. 地球化学, 2010, 39(5): 414-426.
[4] 付建明, 马昌前, 谢才富, 等. 湖南九嶷山复式花岗岩体SHRIMP锆石定年及其地质意义[J]. 大地构造成矿学, 2004, 28(4): 370-378.
[5] 张芳荣, 舒良树, 王德滋, 等. 华南东段加里东期花岗岩类形成构造背景探讨[J]. 地学前缘, 2009, 16(1): 248- 260.
[6] Wang, Y.J., Fan, W.M., Zhao, G.C., et al. (2007) Zircon U-Pb Geochronology of Gneissic Rocks in the Yunkai Massif and Its Implications on the Caledonian Enent in the South China Block. Gondwana Research, 12, 404-416.
https://doi.org/10.1016/j.gr.2006.10.003
[7] Li, Z.X., Li, X.H., Wartho, J.A., et al. (2010) Magmatic and Metamorphic Events during the Early Paleozoic Wuyi- Yunkai Orogeny, Southeastern South China: New Age Constraints and P-T Conditions. Geological Society of America Bulletin, 122, 772-793.
[8] Wan, Y.S., Liu, D.Y., Wild, S.A., et al. (2010) Evolution of the Yunkai Terrane, South China: Evidence from SHRIP Zircon U-Pb Dating, Geochemistry and NdIsotope. Journal of Asian Earth Sciences, 37, 140-153.
https://doi.org/10.1016/j.jseaes.2009.08.002
[9] 沈渭洲, 张芳荣, 舒良树, 等. 2008. 江西宁冈岩体的形成时代、地球化学特征及其构造意义[J]. 岩石学报, 24(10): 2244-2254.
[10] 舒良树. 华南前泥盆纪构造演化: 从华夏地块到加里东期造山带[J]. 高校地质学报, 2006, 12(4): 418-431.
[11] 舒良树, 于津海, 贾东, 等. 华南东段早古生代造山带研究[J]．地质通报, 2008, 27(10): 1581-1593.
[12] 舒良树. 华南构造演化的基本特征[J]. 地质通报, 2012, 31(7): 1035-1053.
[13] Li, X.H., Li, Z.X. and Li, W.X. (2014) Detrital Zircon U-Pb Age and Hf Isotope Constrains on the Generation and Reworking of Precambrian Continental Crust in the Cathaysia Block, South China: A Synthesis. Gondwana Research, 25, 1202-1215.
https://doi.org/10.1016/j.gr.2014.01.003
[14] 周新民. 对华南花岗岩研究的若干思考[J]. 高校地质学报, 2003, 9(4): 556-565.
[15] 王德滋. 华南花岗岩研究的回顾与展望[J]. 高校地质学报, 2004, 10(3): 305-314.
[16] Meert, J.G. and Liebermann, B.S. (2008) The Neoproterozoic Assembly of Gondwana and Its Relationship to the Ediacaran-Cambrian Radiation. Gondwana Research, 14, 5-21.
https://doi.org/10.1016/j.gr.2007.06.007
[17] Nance, R.D., Murphy, J.B. and Santosh, M. (2014) The Supercontinent Cycle: A Retrospective Essay. Gondwana Research, 25, 4-29.
https://doi.org/10.1016/j.gr.2012.12.026
[18] Santosh, M., Maruyama, S., Sawaki, Y., et al. (2014) The Cambrian Explosion: Plumedriven Birth of the Second EcoSystem on Earth. Gondwana Research, 25, 945-965.
https://doi.org/10.1016/j.gr.2013.03.013
[19] 陈相艳, 仝来喜, 张传林, 等. 浙江龙游石榴石角闪岩(退变榴辉岩): 华夏加里东期碰撞造山事件的新证据[J]. 科学通报, 2015, 60(13): 1207-1217.
[20] Zhang, C.L., Santosh, M., Zhu, Q.B., et al. (2014) The Gondwana Connection of South China: Evidence from Monazite and Zircon Geochronology in the Cathaysia Block. Gondwana Research, 28, 1137-1151.
https://doi.org/10.1016/j.gr.2014.09.007
[21] 江西省地质局区域地质调查大队. 1:20万井冈山幅区域地质调查报告[J]. 1974(1): 20.
[22] 杨明桂, 梅勇文, 等. 钦–杭古板块结合带与成矿带的主要特征[J]. 华南地质与矿产, 1997, 10(3): 52-58.
[23] Griffin, W.L., Belousova, E.A., Shee, S.R., Pearson, N.J. and O’Reilly, S.Y. (2004) Archean Crustal Evolution in the Northern Yilgarn Craton: U-Pb and Hf-Isotope evidence from Detrital Zircons. Precambrian Research, 131, 231-282.
https://doi.org/10.1016/j.precamres.2003.12.011
[24] Andersen, T. (2002) Correctiom of Common Pb in U-Pb Analyses that do not Report 2004Pb. Chemical Geology, 192, 59-79.
https://doi.org/10.1016/S0009-2541(02)00195-X
[25] Ludwig, K.R. (2003) Isoplot 3.00 User’s Manual: A Geochronological Toolkit for Microsoft Excel. Berkeley Eochrnological Center: Special Publication.
[26] Middlemost, A.K. (1994) Naming Materials in the Magmas/Igneous Rock System. Earth Science Reviews, 37, 215-224.
https://doi.org/10.1016/0012-8252(94)90029-9
[27] 陈小明, 王汝成, 刘昌实, 等. 广东从化佛冈(主体)黑云母花岗岩定年和成因[J]. 高校地质学报, 2002, 8(3): 293- 307.
[28] 邱检生, 胡建, 王孝磊, 等. 广东河源白石冈岩体: 一个高分异的I型花岗岩[J]. 地质学报, 2005, 79(4): 503-514.
[29] 孙涛, 周新民, 陈培荣, 等. 南岭东段中生代强过铝花岗岩成因及其大地构造意义[J]. 中国科学: Ｄ辑: 地球科学, 2003, 33(12): 1209-1218．
[30] Taylor, S.R. and McLennan, S.M. (1985) The Continental Crust: Its Composition and Evolution. Blackwell Science Publication, Oxford.
[31] Sun, S.S. and McDonough, W.F. (1989) Chemical and Isotopic Systematics of Oceanic Basalts: Implications for Mantle Composition and Processes. In: Saunders, A.D. and Norry, M.J., Eds., Magmatism in the Ocean Basins, Special Publication, London, 313-345.
https://doi.org/10.1144/gsl.sp.1989.042.01.19
[32] 周新民. 南岭地区晚中生代花岗岩成因与岩石圈动力学演化[M]. 北京：科学出版社, 2007: 630.
[33] 刘昌实, 朱金初, 沈渭洲, 等. 华南花岗岩物源成因特征与陆壳演化[J]. 大地构造与成矿学, 1990, 14(2): 125-138.
[34] 王德滋, 刘昌实, 沈渭洲, 等. 桐庐Ｉ型和相山S型两类碎斑熔岩对比[J]. 岩石学报, 1993, 9(1): 44-54.
[35] 李聪, 陈世悦, 张鹏飞, 等. 华南加里东期陆内构造属性探讨[J]. 中国石油大学学报: 自然科学版, 2010, 34(5): 18-24.
[36] 李献华, 王选策, 李武显, 李正祥. 华南新元古代玄武质岩石成因与构造意义: 从造山运动到陆内裂谷[J]. 地球化学, 2008, 37(4): 382-398.
[37] 毛景文, 陈懋弘, 袁顺达, 郭春丽, 等. 华南地区钦杭成矿带地质特征和矿床时空分布规律[J]. 地质学报, 2011, 85(5): 636-658.
[38] 余达淦, 管太阳, 黄国夫, 等. 华南(东)晋宁–加里东海盆地形成, 演化及封闭[J]. 东华理工大学学报(自然科学版) , 1993, 1993(4): 301-319.
[39] Li, Z.X., Li, X.H., Zhou, H.W., et al. (2002) Grenvillian Continental Collision in South China: New SHRIMP U-Pb Zircon Results and Implications for the Configuration of Rodinia. Geology, 30, 163-166.
https://doi.org/10.1130/0091-7613(2002)030<0163:GCCISC>2.0.CO;2
[40] 余达淦, 管太阳, 巫建华, 王勇, 吴仁贵, 等. 江西基础地质研究新进展述评[J]. 东华理工大学学报(自然科学版), 2006(s1): 1-11.
[41] Zhao, G.C. and Cawood, P.A. (2012) Precambrian Geology of China. Precambrian Research, s222-223, 13-54.
https://doi.org/10.1016/j.precamres.2012.09.017
[42] 陈国能, 张珂, 邵荣松, 等. 原地重熔及其地质效应[J]. 中山大学学报: 自然科学版, 2001, 40(3): 95-99．
[43] 陈国能. 岩石成因与岩石圈演化思考[J]. 地学前缘, 2011, 18(1): 1-8.
[44] 吴福元, 李献华, 杨进辉, 郑永飞, 等. 花岗岩成因研究的若干问题[J]. 岩石学报, 2007, 23(6): 1217-1238.