Geochemical Characteristics of Eclogite Xenoliths in Mesozoic Intrusive Complex from Xu-Huai Area and Its Tectonic Significance
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摘要: 利用X-荧光光谱和ICPMS测试了徐淮地区中生代侵入杂岩中榴辉岩类捕虏体的组成.主量元素为: SiO2的含量为40.88%~47.82%, TiO2为0.78%~2.00%, Al2O3为11.72%~16.08%, FeO (全铁) 为12.77%~20.29%, MgO为5.23%~11.47%, CaO为7.80%~13.11%, Na2O为0.30%~2.09%, K2O为0.13%~0.69%.榴辉岩类捕虏体具有较低的稀土元素丰度(ΣREE= (34.26~115.51) ×10-6), 且具有明显的Nb、P、Zr和Ti的负异常.捕虏体的I(Sr) 和ε(Nd, t) 值分别为0.7042~0.7085和-5.77~2.99 (L-4为-13.05).上述特征暗示本区榴辉岩类捕虏体的原岩具有岛弧拉斑玄武岩的特征.榴辉岩类捕虏体Nd的模式年龄和其中锆石SHRIMPUPb年龄显示它们应属于华北克拉通的基底物质.华北克拉通基底物质发生的榴辉岩相变质作用暗示中生代早期华北克拉通东部曾存在一次重要的陆壳加厚过程, 这应与扬子克拉通沿北西或北西西方向深俯冲于华北克拉通之下有关.Abstract: Using X-fluorecence spectrum and ICP-MS tests eclogite xenoliths components in Mesozoic intrusive complex from Xu-Huai area.The major element components are as following, SiO2: 40.88%~47.82%, TiO2: 0.78%~2.00%, Al2O3: 11.72%~16.08%, FeO (total iron) : 12.77%~20.29%, MgO: 5.23%~11.47%, CaO: 7.80%~13.11%, Na2O: 0.30%~2.09%, K2O: 0.13%~0.69%.Eclogite xenoliths have a relatively low REE abundance [ΣREE= (34.26~115.51) ×10-6] and obvious Nb, P, Zr and Ti negative anomaly.The I(Sr) and ε(Nd, t) values of eclogite xenoliths are 0.704 2~0.708 5 and-5.77~2.99 (L-4:-13.05) respectively.These characteristics indicate that their protoliths could be the tholeiitic rocks formed in an island arc environment.The Nd model ages and zircon SHRIMP U-Pb dating of the eclogite xenoliths suggest that they should belong to the basement of the North China craton (NCC).The eclogite phase metamorphism of the basement of the NCC implies that an important continental crustal thickening could have taken place in the eastern part of the NCC in early Mesozoic, which could be attributed to the deep subduction of the Yangtze craton beneath the NCC in an NW or NWW direction.
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Key words:
- Xu-Huai area /
- Mesozoic /
- eclogite /
- xenolith /
- geochemistry /
- tectonic significance
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图 1 徐淮地区中生代侵入杂岩体分布
1.高温(超) 高压变质带; 2.低温高压变质带; 3.秦岭-桐柏深变质杂岩; 4.北淮阳浅变质杂岩; 5.古生代; 6.断层; 7.闪长斑岩和二长闪长斑岩岩体
Fig. 1. Distribution of Mesozoic intrusive complex in Xu-Huai area
图 3 榴辉岩类捕虏体的原始地幔标准化痕量元素蛛网
1.榴辉岩(603-2-2, B1-10);2.石榴石辉石岩(L-4, 603-2-1, J-21, J-22, JG1-8, JG2-11, JG2-22)
Fig. 3. Primitive mantle-normalized trace element spider diagram of eclogite xenoliths
图 4 榴辉岩类捕虏体的稀土元素球粒陨石标准化配分模式
1.榴辉岩(603-2-2, B1-10);2.石榴石辉石岩(L-4, 603-2-1, J-21, J-22, JG1-8, JG2-11, JG2-22)
Fig. 4. Chondrite-normalized REE patterns of eclogite xenoliths
图 5 榴辉岩类捕虏体的I (Sr)-ε(Nd, t) 关系
1.榴辉岩(603-2-2, B1-10);2.石榴石辉石岩(L-4, 603-2-1, J-21, J-22, JG1-8, JG2-11, JG2-22)
Fig. 5. I (Sr) vs.ε(Nd, t) diagram of eclogite xenoliths
表 1 徐淮地区侵入杂岩中榴辉岩类捕虏体的主量(%)、微量元素(10-6) 和Sr-Nd同位素组成
Table 1. Major, trace elements and Sr-Nd isotopic compositions of eclogite xenoliths in Mesozoic intrusive complex
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Ames, L., Tilten, G.R., Zhou, G., 1996.Geochronology and isotopic character of ultrahigh-pressure metamorphism with implications for collision of the Sino-Korean and Yangtze cratons, Central China.Tectonic, 15: 472-489. doi: 10.1029/95TC02552 Ames, L., Tilton, G.R., Zhou, G.Z., 1993.Timing of collision of the Sino-Korean and Yangtze cratons: U-Pb zircon dating of coesite-bearing eclogites.Geology, 21: 339 -342. Boynton, W.V., 1984.Geochemistry of the rare earth elements: Meteorite studies.In: Henderson, P., ed., Rare earth element geochemistry.Elsevier, 63-114. Chavagnac, V., Jahn, B.M., 1996.Coesite-bearing eclogites from the Bixiling complex, Dabie Mountains, China: SmNd ages, geochemical characteristics and tectonic implications.Chem.Geol., 133: 29-51. doi: 10.1016/S0009-2541(96)00068-X Gao, S., Qiu, Y., Ling, W., et al., 2002.SHRIMP single zircon U-Pb dating of the Kongling high-grade metamorphic terrain: Evidence for 3.2 Ga old continental crust in the Yangtze craton.Science in China(Series D), 44: 326-335. Guo, J.H., Chen, F.K., Siebel, W., et al., 2004.Crustal structure and tectonics in post UHP collisional environment of the Sulu orogen, eastern China: Implications for SHRIMP zircon U-Pb dating on Jurassic granites.Terra Nova. Guo, J.H., Zhai, M.G., Ye, K., et al., 2002.The petrology and geochemistry of the high pressure metamorphic basite in Haiyangsuo of the eastern part of Shandong Province.Science in China(Series D), 32(5): 394-404 (in Chinese). Huang, X.L., Xu, Y.G., Liu, D.Y., et al., 2003.Paleoprotorozoic lower crust beneath Nushan in Anhui Province: Evidence from zircon SHRIMP U-Pb dating on granulite xenoliths in Cenozoic alkali basalt.Chinese Science Bulletin, 48(10): 1082-1086(in Chinese). doi: 10.1360/csb2003-48-10-1082 Jahn, B.M., 1998.Geochemical and isotopic characteristics of UHP eclogites and ultramafic rocks of the Dabie orogen: Implications for continental subduction and collisional tectonics.In: Hacker, B.R., Liou, J.G., eds., When continents collide: Geodynamics and geochemistry of ultrahigh-pressure rocks.Kluwer Academic Publishers, Dordrecht, Boston, London, Primed in the Netherlands, 203-239. Li, J.Y., 2001.The time limit and manner of collision between Sino-Korean block and Yangtz block.Acta Geoligica Sinica, 75(1): 25-33(in Chinese with English abstract). Li, S.G., Hart, S.R., Zhang, S.G., 1989.The collision time between North China block and South China block: Evidence from Sm-Nd isotopic age.Science in China(Series B), (3): 312-319(in Chinese). Li, S.G., Jagoutz, E., Lo, C.H., et al., 1999.Sm/Nd, Rb/ Sr, and 40Ar/39Ar isotopic systematics of ultrahigh pressure metamorphic rocks from the Dabie-Sulu belt in central China: A retrospective review.International Geology Review, 41: 1114-1124. doi: 10.1080/00206819909465195 Li, Z.X., Li, X.H., Kinny, P.D., 1999.The breakup of Rodinia: Did it start with a mantle plume beneath South China.Earth and Planet.Sci.Lett., 173: 171-181. doi: 10.1016/S0012-821X(99)00240-X Li, Z.X., 1994.Collision between the north and south blocks: A crust-detachment model for suturing in the region east of the Tan-Lu fault.Geology, 22: 739-742. Liu, Y.C., Xu, S.T., Li, S.G., et al., 2000.Geochemistry feature, Sr-Nd isotope component and geotectonic sense of eclogite in the northern part of Dabie mountain.Science in China(Series D), 30(Suppl.): 99-107(in Chinese). Liu, Z.G., Zhang, R.Y., Jahn, B.M., 2000.Petrological and geochemical characteristics of ultrahigh-pressure metamorphic rocks from the Dabie-Sulu terrane, east-central China.International Geology Review, 42: 328-352. doi: 10.1080/00206810009465086 Luo, Z.K., Miao, L.C., 2002.Granites and gold deposits in Zhaoyuan-Laizhou area, eastern Shandong Province.Metallurgical Industry Press, Beijing, 20-57(in Chinese). Ma, X., Bai, J., 1998.Precambrian crustal evolution of China.Geological Publication House, Springer, Berlin, 1331. Okay, A.I., Xu, S., Sengor, A.M.C., 1989.Coesite from the Dabie Shan eclogites, central China.Eur.Jour.Mineral, 1: 595-598. doi: 10.1127/ejm/1/4/0595 Okay, A.I., Sengor, A.M.C., 1993.Tectonics of an ultrahigh-pressure metamorphic terrane: The Dabie Shan/ Tongbai Shan orogen, China.Tectonics, 12: 1320-1334. doi: 10.1029/93TC01544 Qiao, X.F., Gao, L.Z., Peng, Y., et al., 2001.Seismic event, sequence and tectonic significance in Early Cambrian Canglangpu Stage in paleo-Tancheng-Lujiang fault.Science in China(Series D), 31(11): 911-918 (in Chinese). Shervais, J.W., 1982.Ti-V plots and the petrogenesis of modern and opiolitic lavas.Earth Planet.Sci.Lett., 59: 101-118. doi: 10.1016/0012-821X(82)90120-0 Tang, J.F., Xu, W., 2002.No huge strike slip in the southern sector of the Tancheng-Lujiang fault—Tectonic evidence from Anhui Province.Geological Review, 48(5): 449-456(in Chinese with English abstract). Wang, G.L., Jiang, B., Cao, D.Y., et al., 1998.On the Xuzhou-Suzhou arcuate duplex-imbricate fan thrust system.Acta Geologica Sinica, 72(3): 228-236(in Chinese with English abstract). Wang, Q.H., Xu, W.L., Wang, D.Y., et al., 2003.Composition and thermal state of Mesozoic deep crust in XuHuai area: Evidence from deep-seated xenoliths.Geotectonica et Metallogenia, 27(4): 362-371(in Chinese with English abstract). Xiao, W.J., Zhou, Y.X., Yang, Z.Y., et al., 2000.Multiple rotation and amalgamation processes of Dabie-TanluSulu orogen.Advance in Earth Science, 15(2): 147-153(in Chinese with English abstract). Xu, J.W., Zhu, G., 1994.Tectonic models of the Tan-Lu fault zone, eastern China.International Geology Review, 36: 771-784. doi: 10.1080/00206819409465487 Xu, W.L., Wang, D.Y., Wang, Q.H., et al., 2003.Petrology and geochemistry of two types of mantle-derived xenoliths in Mesozoic diorite from western Shandong Province.Acta Petrologica Sinica, 19(4): 623-636(in Chinese with English abstract). Xu, W.L., Wang, Q.H., Liu, X.C., et al., 2004.Chronology and sources of Mesozoic intrusive complex in Xu-Huai region, central China: Constraints from SHRIMP zircon U-Pb dating.Acta Geologica Sinica, 78(1): 96-106. Xu, W.L., Wang, D.Y., Liu, X.C., et al., 2002.Discovery of eclogite inclusions and its geological significance in early Jurassic intrusive complex in Xuzhou-northern Anhui, eastern China.Chinese Science Bulletin, 47(14): 1212-1216. Yang, J.J., 1991.Eclogite and relevant ultrabasic rocks in Shandong Province and the northern part of Jiangsu Province in eastern part of the North China block.Geological Publishing House, Beijing(in Chinese). Yang, J.S., Xu, Z.Q., Wu, C.L., et al., 2002.SHRIMP UPb dating on coesite-bearing zircon: Evidence for Indosinian ultrahigh-pressure metamorphism in Su-Lu, East China.Acta Geologica Sinica, 76(3): 354-372(in Chinese with English abstract). Yin, A., Nie, S., 1993.An indentation model for the North China and the South China collision and the development of Tanlu and Honam fault system, eastern Asia.Tectonics, 12: 801-813. doi: 10.1029/93TC00313 Zhang, K.J., 1997.North and South China collision along the eastern and Southern North China margins.Tectonophysics, 270: 145-156. doi: 10.1016/S0040-1951(96)00208-9 Zhang, R.Y., Liu, J.G., Cong, B.L., 1995.Talc-, magnesite and Ti-clinochromite-bearing ultrahigh-pressure metamafic and ultramafic complex in the Dabie Mountains.J.Petrol., 36: 1011-1037. doi: 10.1093/petrology/36.4.1011 Zhao, G., Wilde, S.A., Cawood, P.A., et al., 2001.Archean blocks and their boundaries in the North China craton: Lithological, geochemical, structural and P-T path constraints and tectonic evolution.Precambrian Res., 107: 45-73. doi: 10.1016/S0301-9268(00)00154-6 郭敬辉, 翟明国, 叶凯, 等, 2002.胶东海阳所高压变质基性岩的岩石化学和地球化学.中国科学(D辑), 32(5): 394-404. https://www.cnki.com.cn/Article/CJFDTOTAL-JDXK200205005.htm 黄小龙, 徐义刚, 刘敦一, 等, 2003.安徽女山早元古代下地壳: 新生代碱性玄武岩中麻粒岩包体锆石SHRIMP UPb年龄证据.科学通报, 48(10): 1082-1086. doi: 10.3321/j.issn:0023-074X.2003.10.019 李锦轶, 2001.中朝地块与扬子地块碰撞的时限与方式.地质学报, 75(1): 25-33. doi: 10.3321/j.issn:0001-5717.2001.01.003 李曙光, Hart, S.R., 郑双根, 1989.中国华北、华南陆块碰撞时代的Sm-Nd同位素年龄证据.中国科学(B辑), (3): 312-319. https://www.cnki.com.cn/Article/CJFDTOTAL-JBXK198903011.htm 刘贻灿, 徐树桐, 李曙光, 等, 2000.大别山北部榴辉岩的地球化学特征和Sr、Nd同位素组成及其大地构造意义.中国科学(D辑), 30(增刊): 99-107. https://www.cnki.com.cn/Article/CJFDTOTAL-JDXK2000S1012.htm 罗振宽, 苗来成, 2002.胶东招莱地区花岗岩和金矿床.北京: 冶金工业出版社, 20-57. 乔秀夫, 高林志, 彭阳, 等, 2001.古郯庐带沧浪铺阶地震事件、层序及构造意义.中国科学(D辑), 31(11): 911-918. https://www.cnki.com.cn/Article/CJFDTOTAL-JDXK200111004.htm 汤加富, 许卫, 2002.郯庐断裂带南段并无巨大平移———来自安徽境内的证据.地质论评, 48(5): 449-456. doi: 10.3321/j.issn:0371-5736.2002.05.001 王桂梁, 姜波, 曹代勇, 等, 1998.徐州-宿州弧形双冲-叠瓦扇逆冲断层系统.地质学报, 72(3): 228-236. doi: 10.3321/j.issn:0001-5717.1998.03.004 王清海, 许文良, 王冬艳, 等, 2003.徐淮地区中生代深部地壳的物质组成及热状态———深源捕虏体证据.大地构造与成矿, 27(4): 362-371. doi: 10.3969/j.issn.1001-1552.2003.04.007 肖文交, 周姚秀, 杨振宇, 等, 2000.大别-郯庐-苏鲁造山带复合旋转拼贴作用.地球科学进展, 15(2): 147-153. doi: 10.3321/j.issn:1001-8166.2000.02.005 许文良, 王冬艳, 刘晓春, 等, 2002.徐淮地区早侏罗世侵入杂岩体中榴辉岩类包体的发现及其地质意义.科学通报, 47(8): 618-622. doi: 10.3321/j.issn:0023-074X.2002.08.014 许文良, 王冬艳, 王清海, 等, 2003.鲁西中生代闪长岩中两类幔源捕虏体的岩石学和地球化学.岩石学报, 19(4): 623-636. https://www.cnki.com.cn/Article/CJFDTOTAL-YSXB200304003.htm 杨建军, 1991.中国东部山东和江苏北部的榴辉岩和有关的超基性岩.北京: 地质出版社. 杨经绥, 徐志琴, 吴才来, 等, 2002.含柯石英锆石的SHRIMP U-Pb定年: 胶东印支期超高压变质作用的证据.地质学报, 76(3): 354-372. doi: 10.3321/j.issn:0001-5717.2002.03.008 -
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