Mantle Source Lithology of Late Mesozoic Mafic Dikes in Southeastern China
-
摘要: 中国东南部晚中生代的岩浆活动被认为与古太平洋板块的俯冲作用密切相关，而板块的俯冲作用又势必会对地幔的性质产生重要影响.晚中生代基性岩脉在中国东南部尤其是沿海地区广泛分布，为揭示中国东南部地幔演化历史及其与古太平洋板块俯冲之间的潜在成因联系提供了理想的研究对象.因此，对湘、赣、浙、闽、粤五省基性岩脉的年代学和地球化学数据进行了总结，通过恢复它们的原始岩浆组成，厘定其地幔源区岩性，揭示了研究区地幔的岩性演化历史.研究发现，中国东南部晚中生代基性岩脉的源区岩性在地域上没有显著差异，在时间尺度上表现出明显变化.在150~110 Ma期间，中国东南部地幔源区的岩性包含富硅辉石岩和贫硅辉石岩两类；而在110~64 Ma期间，地幔源区的主体岩性转变为贫硅辉石岩，伴随部分橄榄岩.基于上述地幔岩性的演化规律，并结合前人对研究区基性玄武岩的研究工作，认为研究区晚中生代地幔的岩性转变主要受控于古太平洋板块的俯冲过程，是板块俯冲角度改变的结果.Abstract: Late Mesozoic magmatism in southeastern China was controlled by the subduction of paleo-Pacific plate, and the mantle beneath the area should also have been affected by such process.Late Mesozoic mafic dikes are widely distributed in southeastern China, especially in the coastal areas, which provide an ideal setting for studying the mantle evolution and subduction process of paleo-Pacific plate. Here it summarizes the chronological and geochemical data of mafic dikes in Hunan, Jiangxi, Zhejiang, Fujian and Guangdong provinces. Source lithologies of these rocks are identified by the compositions of fractionation-corrected primary magmas. The study indicates that the mantle lithologies of these mafic dikes in southeastern China do not show obvious differences in space, but significant changes with time. The source lithologies of mafic dikes during the period of 150-110 Ma are composed of SiO2-rich pyroxenite and SiO2-poor pyroxenite, whereas the source lithologies during 110-64 Ma are primarily composed of SiO2-poor pyroxenite, with minor peridotite. Therefore, it is suggested that the lithological variation of Late Mesozoic mantle beneath southeastern China is controlled by the subduction of paleo-Pacific plate via the variation of the subduction angle.
-
Key words:
- mafic dike /
- primary magma /
- source lithology /
- paleo-Pacific plate /
- southeastern China /
- petrology
-
图 1 中国东南部晚中生代基性岩脉分布
Fig. 1. Distribution of the Late Mesozoic mafic dikes in southeastern China
图 2 中国东南部晚中生代基性岩脉全岩MgO与CaO/Al2O3协变图
基性岩脉数据来源已在文中列出，黑色十字表示用“Petrolog 3”软件(Danyushevsky and Plechov, 2011)模拟的分离结晶过程，初始熔体1、2分别为Xyk4和ZHC-13的原始岩浆成分，潜在结晶矿物相为橄榄石(Ol)和单斜辉石(Cpx)，“L-Ol”表示橄榄石分离结晶，“L-Ol-Cpx”表示橄榄石和单斜辉石分离结晶，“L+Ol”表示橄榄石堆晶
Fig. 2. Variations of CaO/Al2O3 versus MgO for Late Mesozoic mafic dikes in southeastern China
图 3 中国东南部晚中生代基性岩脉全岩SiO2与K2O/TiO2协变图
其中经历过单斜辉石分离结晶的样品(MgO < 7.5%，图中半透明符号所示)已被排除；中国东部大陆地壳数据引自Gao et al.(1998)
Fig. 3. Variations of K2O/TiO2 versus SiO2 for the Late Mesozoic mafic dikes in southeastern China
图 4 中国东南部晚中生代基性岩脉原始岩浆成分相图(a); MgO与CaO协变图(b); MgO与SiO2协变图(c)
图a为以摩尔比例从Diopside向CATS-Olivine-Quartz平面投影的假三元相图(Herzberg, 2011)，箭头表示温度降低方向；图b中黑色分离结晶趋势线以及橄榄岩实验熔体(2~7 GPa)区域据Herzberg (2011)；图c中贫硅辉石岩、富硅辉石岩及橄榄岩实验熔体区域，华南晚中生代玄武岩原始岩浆数据均据Zeng et al.(2016)，缩写：Ol.橄榄石；Cpx.单斜辉石；Opx.斜方辉石、Qz.石英；Grt.石榴子石；Plag.斜长石
Fig. 4. Phase diagram of primary magmas for Late Mesozoic mafic dikes in southeastern China (a), variations of CaO versus MgO (b), variations of SiO2 versus MgO (c)
图 5 中国东南部晚中生代基性岩脉Fe/Mn与FeOT/CaO-3MgO/SiO2协变图
橄榄岩熔体推荐FC3MS值上限(0.65)、橄榄岩和辉石岩实验熔体数据引自Yang et al.(2016)
Fig. 5. Variations of FeOT/CaO-3MgO/SiO2 versus Fe/Mn for the Late Mesozoic mafic dikes in southeastern China
-
Alt, J.C., Teagle, D.A.H., 1999.The Uptake of Carbon during Alteration of Ocean Crust.Geochimica et Cosmochimica Acta, 63(10):1527-1535. https://doi.org/10.1016/s0016-7037(99)00123-4 Beattie, P., 1994.Systematics and Energetics of Trace-Element Partitioning between Olivine and Silicate Melts:Implications for the Nature of Mineral/Melt Partitioning.Chemical Geology, 117(1-4):57-71. https://doi.org/10.1016/0009-2541(94)90121-x Cao, J.J., Hu, R.Z., Xie, G.Q., et al., 2009.Geochemistry and Genesis of Mafic Dikes from the Coastal Areas of Guangdong Province, China.Acta Petrologica Sinica, 25(4):984-1000(in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTotal-YSXB200904023.htm Chen, C.H., Lee, C.Y., Shinjo, R., 2008.Was There Jurassic Paleo-Pacific Subduction in South China?:Constraints from 40Ar/39Ar Dating, Elemental and Sr-Nd-Pb Isotopic Geochemistry of the Mesozoic Basalts.Lithos, 106(1-2):83-92. https://doi.org/10.1016/j.lithos.2008.06.009 Danyushevsky, L.V., Plechov, P., 2011.Petrolog3:Integrated Software for Modeling Crystallization Processes.Geochemistry, Geophysics, Geosystems, 12(7):Q07021. https://doi.org/10.1029/2011gc003516 Dasgupta, R., Jackson, M.G., Lee, C.T.A., 2010.Major Element Chemistry of Ocean Island Basalts:Conditions of Mantle Melting and Heterogeneity of Mantle Source.Earth and Planetary Science Letters, 289(3-4):377-392. https://doi.org/10.1016/j.epsl.2009.11.027 Dong, C.W., Yan, Q., Zhang, D.R., et al., 2010.Late Mesozoic Extension in the Coastal Area of Zhejiang and Fujian Provinces:A Petrologic Indicator from the Dongji Island Mafic Dike Swarms.Acta Petrologica Sinica, 26(4):1195-1203(in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTotal-YSXB201004018.htm Gao, S., Luo, T.C., Zhang, B.R., et al., 1998.Chemical Composition of the Continental Crust as Revealed by Studies in East China.Geochimica et Cosmochimica Acta, 62(11):1959-1975. https://doi.org/10.1016/s0016-7037(98)00121-5 Gerbode, C., Dasgupta, R., 2010.Carbonate-Fluxed Melting of MORB-Like Pyroxenite at 2-9 GPa and Genesis of HIMU Ocean Island Basalts.Journal of Petrology, 51(10):2067-2088. https://doi.org/10.1093/petrology/egq049 He, Z.Y., Xu, X.S., 2012.Petrogenesis of the Late Yanshanian Mantle-Derived Intrusions in Southeastern China:Response to the Geodynamics of Paleo-Pacific Plate Subduction.Chemical Geology, 328:208-221. https://doi.org/10.1016/j.chemgeo.2011.09.014 Herzberg, C., 2011.Identification of Source Lithology in the Hawaiian and Canary Islands:Implications for Origins.Journal of Petrology, 52(1):113-146. https://doi.org/10.1093/petrology/egq075 Hill, E., Blundy, J.D., Wood, B.J., 2011.Clinopyroxene-Melt Trace Element Partitioning and the Development of a Predictive Model for HFSE and Sc.Contributions to Mineralogy and Petrology, 161(3):423-438. https://doi.org/10.1007/s00410-010-0540-0 Huang, S., Frey, F.A., 2003.Trace Element Abundances of Mauna Kea Basalt from Phase 2 of the Hawaii Scientific Drilling Project:Petrogenetic Implications of Correlations with Major Element Content and Isotopic Ratios.Geochemistry, Geophysics, Geosystems, 4(6):8711. https://doi.org/10.1029/2002gc000322 Jia, D.C., Hu, R.Z., Xie, G.Q., 2002.Trace Element Geochemical Characteristics and Genesis of Mesozoic Mafic Dikes in Northeast Hunan Province.Geology-Geochemistry, 30(3):33-39(in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-DZDQ200203005.htm John, B.M., Zhou, X.H., Li, J.L., 1990.Formation and Tectonic Evolution of Southeastern China and Taiwan:Isotopic and Geochemical Constraints.Tectonophysics, 183(1-4):145-160. https://doi.org/10.1016/0040-1951(90)90413-3 Li, F.L., Zhou, H.W., Tang, Z.C., et al., 2011.U-Pb Ages, Geochemistry and Tectonic Implications of Mafic Dyke Swarms in Mugua, Chun'an County, Zhejiang Province.Geochimica, 40(1):22-34(in Chinese with English abstract). Li, X.H., Hu, R.Z., Rao, B., 1997.Geochronology and Geochemistry of Cretaceous Mafic Dikes from Northern Guangdong, SE China.Geochimica, 26(2):14-31(in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-DQHX702.003.htm Li, Z.X., Li, X.H., 2007.Formation of the 1 300 km-Wide Intracontinental Orogen and Postorogenic Magmatic Province in Mesozoic South China:A Flat-Slab Subduction Model.Geology, 35(2):179-182. https://doi.org/10.1130/g23193a.1 Liu, L., Xu, X.S., Xia, Y., 2014.Cretaceous Pacific Plate Movement beneath SE China:Evidence from Episodic Volcanism and Related Intrusions.Tectonophysics, 614:170-184. https://doi.org/10.1016/j.tecto.2013.12.007 Pertermann, M., Hirschmann, M.M., 2003.Anhydrous Partial Melting Experiments on MORB-Like Eclogite:Phase Relations, Phase Compositions and Mineral-Melt Partitioning of Major Elements at 2-3 GPa.Journal of Petrology, 44(12):2173-2201. https://doi.org/10.1093/petrology/egg074 Pilet, S., Baker, M.B., Stolper, E.M., 2008.Metasomatized Lithosphere and the Origin of Alkaline Lavas.Science, 320(5878):916-919. https://doi.org/10.1126/science.1156563 Qi, Y.Q., Hu, R.Z., Liu, S., et al., 2012.Geochemical and Sr-Nd-Pb Isotopic Compositions of Mesozoic Mafic Dikes from the Gan-Hang Tectonic Belt, South China:Petrogenesis and Geodynamic Significance.International Geology Review, 54(8):920-939. https://doi.org/10.1080/00206814.2011.588820 Qin, S.C., Fan, W.M., Guo, F., et al., 2010.Petrogenesis of Late Mesozoic Diabase Dikes in Zhejiang-Fujian Provinces:Constraints from Ar-Ar Dating and Geochemistry.Acta Petrologica Sinica, 26(11):3295-3306 (in Chinese with English abstract). Roeder, P.L., Emslie, R.F., 1970.Olivine-Liquid Equilibrium.Contributions to Mineralogy and Petrology, 29(4):275-289. https://doi.org/10.1007/bf00371276 Sobolev, A.V., Hofmann, A.W., Kuzmin, D.V.et al., 2007.The Amount of Recycled Crust in Sources of Mantle-Derived Melts.Science, 316(5823):412-417. https://doi.org/10.1126/science.1138113 Spandler, C., Yaxley, G., Green, D.H., et al., 2008.Phase Relations and Melting of Anhydrous K-Bearing Eclogite from 1 200 to 1 600 ℃ and 3 to 5 GPa.Journal of Petrology, 49(4):771-795. https://doi.org/10.1093/petrology/egm039 Sun, Y., Ma, C.Q., Liu, B., 2017.Record of Late Yanshanian Mafic Magmatic Activity in the Middle-Lower Yangtze River Metallogenic Belt.Earth Science, 42(6):891-908(in Chinese with English abstract). http://www.en.cnki.com.cn/Article_en/CJFDTOTAL-DQKX201706004.htm Tang, Z.C., Zhou, H.W., Hu, K.M., et al., 2019.Petrogenesis of Late Mesozoic Granites in Northwestern Zhejiang.Earth Science, 44(4):1278-1294 (in Chinese with English abstract). Walter, M.J., 1998.Melting of Garnet Peridotite and the Origin of Komatiite and Depleted Lithosphere.Journal of Petrology, 39(1):29-60. https://doi.org/10.1093/petrology/39.1.29 Wang, Y.J., Fan, W.M., Guo, F., et al., 2003.Geochemistry of Mesozoic Mafic Rocks Adjacent to the Chenzhou-Linwu Fault, South China:Implications for the Lithospheric Boundary between the Yangtze and Cathaysia Blocks.International Geology Review, 45(3):263-286. https://doi.org/10.2747/0020-6814.45.3.263 Xie, G.Q., 2003.Late Mesozoic Mafic Dikes (Body) from Southeastern China: Geological and Geochemical Characteristics and Its Geodynamics—A Case of Jiangxi Province (Dissertation).Institute of Geochemistry, Chinese Academy of Sciences, Guiyang (in Chinese with English abstract). Xu, Y.G., Zhang, H.H., Qiu, H.N., et al., 2012a.Oceanic Crust Components in Continental Basalts from Shuangliao, Northeast China:Derived from the Mantle Transition Zone? Chemical Geology, 328:168-184. https://doi.org/10.1016/j.chemgeo.2012.01.027 Xu, Z., Zhao, Z.F., Zheng, Y.F., 2012b.Slab-Mantle Interaction for Thinning of Cratonic Lithospheric Mantle in North China:Geochemical Evidence from Cenozoic Continental Basalts in Central Shandong.Lithos, 146-147:202-217. https://doi.org/10.1016/j.lithos.2012.05.019 Yang, Y.F., 2008.Chronology and Geochemistry of Late Mesozoic Basic-Intermediate Dike Swarms from the Coastland of Fujian Province (Dissertation).Zhejiang University, Hangzhou (in Chinese with English abstract). Yang, Z.F., Li, J., Liang, W.F., et al., 2016.On the Chemical Markers of Pyroxenite Contributions in Continental Basalts in Eastern China:Implications for Source Lithology and the Origin of Basalts.Earth-Science Reviews, 157:18-31. https://doi.org/10.1016/j.earscirev.2016.04.001 Zeng, G., Chen, L.H., Xu, X.S., et al., 2010.Carbonated Mantle Sources for Cenozoic Intra-Plate Alkaline Basalts in Shandong, North China.Chemical Geology, 273(1-2):35-45. https://doi.org/10.1016/j.chemgeo.2010.02.009 Zeng, G., He, Z.Y., Li, Z., et al., 2016.Geodynamics of Paleo-Pacific Plate Subduction Constrained by the Source Lithologies of Late Mesozoic Basalts in Southeastern China.Geophysical Research Letters, 43(19):10189-10197. https://doi.org/10.1002/2016gl070346 Zhang, G.S., 2006.Chronology, Geochemistry, and Geodynamic Significance of the Mafic-Ultramafic Rocks in Fujian Province since Late Mesozoic (Dissertation).Institute of Geochemistry, Chinese Academy of Sciences, Guiyang (in Chinese with English abstract). Zhao, J.H., 2004.Chronology and Geochemistry of Mafic Rocks from Fujian Province: Implications for the Mantle Evolution of SE China since Late Mesozoic (Dissertation).Institute of Geochemistry, Chinese Academy of Sciences, Guiyang (in Chinese with English abstract). Zhou, X.M., Li, W.X., 2000.Origin of Late Mesozoic Igneous Rocks in Southeastern China:Implications for Lithosphere Subduction and Underplating of Mafic Magmas.Tectonophysics, 326(3-4):269-287. https://doi.org/10.1016/s0040-1951(00)00120-7 曹建劲, 胡瑞忠, 谢桂青, 等, 2009.广东沿海地区基性岩脉地球化学及成因.岩石学报, 25(4):984-1000. http://d.old.wanfangdata.com.cn/Periodical/ysxb98200904023 董传万, 闫强, 张登荣, 等, 2010.浙闽沿海晚中生代伸展构造的岩石学标志:东极岛镁铁质岩墙群.岩石学报, 26(4):1195-1203. http://d.old.wanfangdata.com.cn/Periodical/ysxb98201004017 贾大成, 胡瑞忠, 谢桂青, 2002.湘东北中生代基性岩脉微量元素地球化学特征及岩石成因.地质地球化学, 30(3):33-39. doi: 10.3969/j.issn.1672-9250.2002.03.006 李福林, 周汉文, 唐增才, 等, 2011.浙江淳安木瓜基性岩墙群U-Pb年龄、地球化学特征及意义.地球化学, 40(1):22-34. http://d.old.wanfangdata.com.cn/Periodical/dqhx201101003 李献华, 胡瑞忠, 饶冰, 1997.粤北白垩纪基性岩脉的年代学和地球化学.地球化学, 26(2):14-31. doi: 10.3321/j.issn:0379-1726.1997.02.004 秦社彩, 范蔚茗, 郭锋, 等, 2010.浙闽晚中生代辉绿岩脉的岩石成因:年代学与地球化学制约.岩石学报, 26(11):3295-3306. http://d.old.wanfangdata.com.cn/Periodical/ysxb98201011011 孙洋, 马昌前, 刘彬, 2017.长江中下游地区燕山晚期基性岩浆活动的记录.地球科学, 42(6):891-908. http://earth-science.net/WebPage/Article.aspx?id=3586 唐增才, 周汉文, 胡开明, 等, 2019.浙西北地区晚中生代花岗岩的岩石成因.地球科学, 44(4):1278-1294. http://earth-science.net/WebPage/Article.aspx?id=4195 谢桂青, 2003.中国东南部晚中生代以来的基性岩脉(体)的地质地球化学特征及其地球动力学意义初探——以江西省为例(博士学位论文).贵阳: 中国科学院地球化学研究所. http://d.wanfangdata.com.cn/Thesis/Y540868 杨永峰, 2008.福建沿海地区晚中生代中-基性岩墙群的年代学和岩石地球化学(硕士学位论文).杭州: 浙江大学. http://cdmd.cnki.com.cn/Article/CDMD-10335-2009024628.htm 张贵山, 2006.福建晚中生代以来基性-超基性岩的年代学、地球化学及其地球动力学意义(博士学位论文).贵阳: 中国科学院地球化学研究所. http://cdmd.cnki.com.cn/Article/CDMD-80065-2006161421.htm 赵军红, 2004.福建省基性岩的年代学和地球化学: 晚中生代以来中国东南部地幔演化(博士学位论文).贵阳: 中国科学院地球化学研究所. http://cdmd.cnki.com.cn/Article/CDMD-80065-2004082730.htm -
下载:
点击查看大图
图(6)
计量
- 文章访问数: 5755
- HTML全文浏览量: 2350
- PDF下载量: 87
- 被引次数: 0
