Late Mesozoic tectonic extension in SE China: Evidence from the basic dike swarms in Hainan Island, China
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摘要: 在系统地分析了海南岛文市、叉河、三亚地区的三处基性岩墙群的LA-ICP-MS锆石U-Pb年代学和元素地球化学特征的基础上,探讨了岩墙群的来源和其反映的地球动力学背景。文市岩墙群形成于约101Ma,叉河和三亚岩墙群形成于约93Ma; 主量元素化学特征显示它们属碱性系列,微量元素化学特征为富集轻稀土元素和大离子亲石元素(Sr、K、Rb、Ba、Th),亏损高场强元素(Nb、Ta、Ti); Sr-Nd同位素组分显示其源区具有EMⅡ特征。这两期岩墙群的存在,显示了海南岛地区在早白垩世晚期和晚白垩世早期存在两次构造伸展事件。海南岛90Ma左右的岩墙群与广东、福建同时代的岩墙群构成中国东南沿海90Ma广泛发育的、呈近北北东向展布的岩墙群带,它们具有相同成因机制,指示中国东南部在90Ma左右时经历了强烈区域性拉张作用; 这些岩墙群虽来源于不同的地幔源区,但均与俯冲流体交代作用有关。Abstract: Systematically LA-ICP-MS zircons U-Pb chronology and geochemistry research on dike swarms from Wenshi, Chahe and Sanya were analyzed in this paper, and then the source and dynamics background of these dike swarms were discussed. The Wenshi dikes were emplaced at 101Ma, while the Chahe and Sanya dike swarms were emplaced at 93Ma. They belongs to alkaline series, characterized by enrichment in LILE (Sr, K, Rb, Ba and Th) and LREE; depletion in HFSE (Nb, Ta and Ti ), and the mantle source shows an EMⅡsignature according to Sr-Nd isotope. The forming of Wenshi dikes show the extensional tectonic of Hainan Island at about 90Ma, while Chahe and Sanya dikes show the tectonic extension at 101Ma. The dike swarms from Hainan Island at about 90Ma and the coevality dikes from Guangdong, Fujian provinces constitute dikes strip which is NNE orientated at about 90Ma of SE China, and they have the same cause of formation , show that it was at strong lithosphere extension stage at about 90Ma. Though these dike swarms were from different mantle source, they were related to subducted liquid replacement.
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Key words:
- U-Pb zircon dating /
- Geochemistry /
- Basic dike swarm /
- Late Cretaceous /
- Hainan Island
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[1] Boynton WV.1984. Geochemistry of the rare earth elements:Meteorite studies.In:Henderson P(ed.).Rare Earth Element Geochemistry.Elservier,63-114
[2] Chen YL,Luo ZH,Zhao JX et al.2005. Petrogenesis and dating of the Kangding complex,Sichuan Province.Science in China(Series D),48(5):622-634
[3] Dong CW,Zhang DR,Xu XS et al.2006. SHRIMP U-Pb dating and litho-geochemistry of basic-intermediate dike swarms from Jinjiang,Fujian Province.Acta Petrologica Sinica,22(6):1696-1702(in Chinese with English abstract)
[4] Ge XY,Li XH and Zhou HW.2003. Geochronologic,geochemistry and Sr-Nd isotopes of the Late Cretaceous marie dike swarms in southern Hainan Island.Geochimica,32(1):11-20(in Chinese with English abstract)
[5] Gill JB.1981. Orogenic Andesites and Plate Tectonics.Berlin:Springer-Verlag,358-360
[6] Hoek JD and Seitz HM.1995. Continental mafic dyke swarms as tectonic indicators:An example from the Vestfold Hills,East Antarctica.Precambrian Research,75(3-4):121-139
[7] Hoffman AW,Jochum KP,Seufert M et al.1986. Nd and Pb in oceanic basahs:New constraints on mantle evolution.Earth Planet.Sci.Lett.,79:33-45
[8] Hou GT,Liu YL,Li JH and Jin AW.2005. The SHRIMP U-Pb chronology of mafic dyke swarms:A case study of Laiwu diabase dykes in western Shandong.Acta Petrologica Et Mineralogica,24(3):81-481(in Chinese with English abstract)
[9] Hou GT,Liu YL and Li JH.2006a.Evidence for~1.8 Ga extension of the Eastern Block of the North China Craton from SHRIMP U-Pb dating of mafic dyke swarms in Shandong Province.Journal of Asian Earth Science,27(4):392-401
[10] Hou GT,Wang CC,Li JH and Qian XL.2006b.Late Paleoproterozoic extension and a paleostress field reconstruction of the North China Craton.Tectonophysics,422:89-98
[11] Jackson SE,Pearson N J,Griffin WL et al.2004. The application of laser ablation-inductively coupled plasma-mass spectrometry to in situ U-Pb zircon geochronology.Chemical Geology,211(1-2):47-69
[12] Lan CY,Chung SL,mertzam SA et al.1995. Mafic dikes from Chimen and Liehyu off southeast China:Petrochemical characteristics and tectonic implications.J.Geol.Soc.China,38(3):183-213
[13] Langmuir CH,Vocke RD,Hanson GN and Hart SR.1978. A general mixing eqution with applications to Icelandic basalts.Earth Planet.Sci.Lett.,37:380-392
[14] Le Bas MJ,LeMaitre RW and Streckelsen A.1986. A chemical classification of volcanic rocks based on the total alkli-slica diagram.J.Petrology,27(6):745-750
[15] Li XH,Hu RZ and Rao B.1997. Geochronology and geochemistry of cretaceous mafic dikes from northern Guangdong SE China.Geochimica,26(2):14-30(in Chinese with English abstract)
[16] Li XH.2000. Cretaceous magmatism and lithospheric extension in Southeast China.J.Asian Earth Sci.,18:293-305
[17] Liu HL,Yan P,Liu YC and Dang H.2006. The existence of South Hainan Island suture in the Northern margin of the South Sea.Chinese Science Bulletin,51(Suppl.Ⅱ):92-100(in Chinese)
[18] Mactin H,Bonin B,Capdevila R et al.1994. The Kuiipe alkline granitic complex(SE China):Petrology and geochemistry.J.Petrology,35:983-1015
[19] Meschede M.1986. A method of discriminating between different type of mid-ocean ridge basalts and continental tholeiites with the Nb-Zr-Y diagram.Chem.Geol.,56:207-218
[20] Pearce JA and Norry MJ.1979. Petrogenetic implications of Ti,Zr,Y and Nb variations in volcanic rocks.Contrib.Mineral.Petrol.,69:33-47
[21] Pearce JA.1982. Trace element characteristics of lavas from destructive plate boundaries.In:Thrope RS(ed.).Andesites.New York:Wiley,525-548
[22] Pearce JA.1983. Role of the sub-continental lithosphere in magma genesis at active continental margins.In:Hawkewprth CJ and Norry MJ(eds.).Continental Basalt and Mantle Xenoliths.Nantwich Shiva,230-249
[23] Pang P,Zhai MG,Ernst R,Gun JH,Liu F and Hu B.2008. A 1.78 Ga Large Igneous Province in the North China Craton:The Xiong ˊer Volcanic Province and the North China dyke swarm.Lithos,101(3-4):260-280
[24] Sun SS and Mcdonough WF.1989. Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes.In:Saundeis AD and Norry MJ(eds.).Magmatism in the Ocean Basins.Geol.Soc.Spec.Publ.,(42):313-345
[25] Weaver BL and Tamey J.1981. The Scourie dake suite:Petrogenesis and geochemical nature of the Proterozoic subcontinental mantle.Contrib.Mineral.Petrol.,78:175-188
[26] Xie GQ,Hu RZ and Jia DC.2002. Geological and geochemical characteristics and its significance of mafic dikes from Northwest Jiangxi Province.Geochimica,31(4):229-337(in Chinese with English abstract)
[27] Xu YG,Ma JL,Frey FA,Feigenson MD and Liu JF.2005. Role of lithosphere-asthenosphere interaction in the genesis of Quaternary alkali and tholeiitic basalts from Datong,western North China Craton.Chemical Geology,224:247-271
[28] Yun P,Lei YH and Lv CY.2005. Sr and Nd isotopic constraints on the source regions of the Triassic granitoids in central-northern Hainan Island and their significance.Geotectonica Et Metallogenia,29 (2):243-141(in Chinese with English abstract)
[29] Zhang GS,Wen HJ and Qiu YZ.2004. Geochemistry of the Late Mesozoic marie dikes in western Fujian Province.Geochimica,33(3):243-253(in Chinese with English abstract)
[30] Zhang GS,Wen HJ,Hu RZ,Qiu YZ and Xu C.2007. Genesis and dynamic setting of marie dikes in southeastern Fujian evidence from Sr-Nd isotopic and major and trace element geochemistry.Acta Petrologica Sinica,23(4):794-803(in Chinese with English abstract)
[31] Zhao JH.2004. Chronology and geochemistry of mafic rocks from Fujian Province:Implications for the mantle evolution of SE China since Late Mesozoic.Ph.D.Dissertation.Guiyang:Institute of geochemistry,Chinese Academy of Sciences,1-107(in Chinese with English summary)
[32] Zhou XM and Li WX.2000. Origin of Late Mesozoic igneous racks in southeastern China:Implications for lithosphere subduction and underplating of marie magmas.Tectonophysics,326:269-287
[33] Zhou XR and Wu KL.1994. Zhangzhou I-A Type Granite.Beijing:Science Press,1-148
[34] Zhu B,Hong LF,Shen WZ,Lu JJ,Dang P and Tan Z.2008. Geochemical characteristics of Late Cretaceous diabase porphyrite dikes in the Xiazhuang uranium orefield,northern Guangdong Province and its tectonic significance.Geological Review,54(1):27-25(in Chinese with English abstract)
[35] 董传万,张登荣,徐夕生,闫强,竺国强.2006.福建晋江中-基性岩墙群的锆石SHRIMP U-Pb定年和岩石地球化学.岩石学报,22(6):1969-1701
[36] 葛小月,李献华,周汉文.2003.琼南晚白垩世基性岩墙群的年代学、元素地球化学和Sr-Nd同位素研究.地球化学,32(1):11-20
[37] 侯贵廷,刘玉琳,李江海,金爱文.2005.关于基性岩墙群的U-Pb SHRIMP地质年代学的探讨--以鲁西莱芜辉绿岩岩墙为例.岩石矿物学杂志,24(3):81-481
[38] 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):14-30
[39] 刘海龄,阎贫,刘迎春,邓辉.2006.南海北缘琼南缝合带的存在.科学通报,51(增刊Ⅱ):92-100
[40] 谢桂青,胡瑞忠,贾大成.2002.赣西北基性岩脉的地质地球化学特征及其意义.地球化学,31(4):229-337
[41] 云平,雷裕红,吕嫦艳.2005.海南岛中北部三叠纪花岗岩源区的锶、钕同位素制约及其意义.大地构造与成矿学,29(2):243-141
[42] 张贵山,温汉捷,裘愉卓.2004.闽西晚中生代基性岩脉的地球化学研究.地球化学,33(3):243-253
[43] 张贵山,温汉捷,胡瑞忠,裘愉卓,许成.2007.闽东南基性岩脉成因及动力学背景研究:Sr-Nd同位素、元素地球化学.岩石学报,23(4):794-803
[44] 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,1-107
[45] 周询若,吴克隆.1994.漳洲I-A型花岗岩.北京:科学出版社,1-148
[46] 朱捌,凌洪飞,沈渭洲,陆建军,邓平,谭正.2008.粤北下庄矿田晚白垩世辉绿玢岩的地球化学特征及其构造意义.地质论评,54(1):27-25
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