辉南新生代玄武岩中橄榄岩捕虏体矿物化学与华北岩石圈地幔演化
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摘要
利用电子探针和LA-ICPMS对吉林辉南新生代玄武岩中橄榄岩捕虏体的矿物进行了主、微量元素分析,讨论了辉南陆下岩石圈地幔的性质及其在华北克拉通破坏过程中的意义。橄榄石、单斜辉石和尖晶石的Mg#和Cr#均表明该区陆下岩石圈地幔主体是饱满的,同时也存在少量过渡和难熔型地幔。单斜辉石球粒陨石标准化的REE配分形式包括LREE亏损、倒U字型REE和LREE富集等不同类型,这些特征说明辉南陆下岩石圈地幔经历了低于10%的分离部分熔融作用,并遭受后期硅酸盐熔体交代作用,但个别样品有碳酸岩熔体交代的残留。橄榄石Mg#和平衡温度无相关性,说明辉南陆下岩石圈地幔不存在明显的分层而是交叉并置的。这些地幔特征和华北东部其他地区新生代的主体地幔性质相似,显示饱满地幔和难熔地幔的共存,可能是熔-岩反应、侵蚀作用和上涌软流圈物质冷却转变置换的综合结果。
A suite of peridotite xenoliths from the Huinan Cenozoic basalts in Jilin Province was studied to provide constraints on the nature and evolution of subcontinental lithospheric mantle(SCLM)beneath this region using electron microprobe and LA-ICPMS.Mg# and Cr# of olivines,clinopyroxenes and spinels from the Huinan peridotite xenoliths show the SCLM beneath this region is mainly fertile mantle with minor transitional/refractory relics.Chondrite-normalized REE patterns of clinopyroxenes vary widely from LREE-depleted,through convex-upward to LREE-enriched,indicating the SCLM have undergone lower than 10% fractional partial melting from primitive mantle and later silicate melt metasomatism with only a little carbonatitic melt metasomatism overprinting.No correlation between Mg# in olivine and equilibration temperature suggests that there is no obvious stratification within the Huinan SCLM.These mantle characteristics,similar with that of dominate Cenozoic mantle beneath other parts of the eastern North China,reveal the coexistence of fertile and transitional lithospheric mantle beneath this region and represent comprehensive results that newly accreted materials replace the aged lithospheric mantle through melt-rock interaction /erosion and the cooling of the upwelled asthenoshpere.
A suite of peridotite xenoliths from the Huinan Cenozoic basalts in Jilin Province was studied to provide constraints on the nature and evolution of subcontinental lithospheric mantle(SCLM)beneath this region using electron microprobe and LA-ICPMS.Mg# and Cr# of olivines,clinopyroxenes and spinels from the Huinan peridotite xenoliths show the SCLM beneath this region is mainly fertile mantle with minor transitional/refractory relics.Chondrite-normalized REE patterns of clinopyroxenes vary widely from LREE-depleted,through convex-upward to LREE-enriched,indicating the SCLM have undergone lower than 10% fractional partial melting from primitive mantle and later silicate melt metasomatism with only a little carbonatitic melt metasomatism overprinting.No correlation between Mg# in olivine and equilibration temperature suggests that there is no obvious stratification within the Huinan SCLM.These mantle characteristics,similar with that of dominate Cenozoic mantle beneath other parts of the eastern North China,reveal the coexistence of fertile and transitional lithospheric mantle beneath this region and represent comprehensive results that newly accreted materials replace the aged lithospheric mantle through melt-rock interaction /erosion and the cooling of the upwelled asthenoshpere.
引文
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吴福元,徐义刚,高山,郑建平.2008.华北岩石圈减薄与克拉通破坏研究的主要学术争论.岩石学报,24(6):1145～1174.
徐义刚.1999.岩石圈的热-机械侵蚀和化学侵蚀与岩石圈减薄.矿物岩石地球化学通报,18:1～5.
徐义刚,黄小龙,Thirl wall MF,陈小明.2003.吉林辉南“反应”成因方辉橄榄岩包体及其深部动力学意义.岩石学报,19(1):19～26.
袁学诚.1996.中国地球物理图集.北京:地质出版社,59～62.
袁学诚.2007.再论岩石圈地幔蘑菇云构造及其深部成因.中国地质,34(5):737～758.
张宏福.2006.橄榄岩-熔体的相互作用:岩石圈地幔组成转变的重要方式.地学前缘,13(2):65～75.
张志海,郑建平,马鸿文.2006.吉林汪清-辉南地幔透辉石微量元素及其记录的地幔熔融和交代作用.地质科技情报,25(6):9～16.
郑建平.1999.中国东部地幔置换作用与中新生代岩石圈减薄.武汉:中国地质大学出版社,1～112.
郑建平,路凤香,O’Reilly S Y,Griffin WL,张明.2000.华北东部地幔改造作用和置换作用:单斜辉石激光探针研究.中国科学,30(4):373～382.
郑建平,路凤香,O’Relly S Y,罗照华.2001.新疆托云地幔单斜辉石微量元素与西南天山岩石圈深部过程.科学通报,46(6):497～501.
郑建平,余淳梅,路凤香,张志海,汤华云.2007.华北东部大陆岩石圈地幔组成、年龄与岩石圈减薄.地学前缘,14(2):87～97.
郑建平.2009.不同时空背景幔源物质对比与华北深部岩石圈破坏和增生过程.科学通报,54(1):1～18.
周新华.2006.中国东部中、新生代岩石圈转型与减薄研究若干问题.地学前缘,13:50～64.
Blusztajn J,Shimizu N.1994.The trace-element variations inclinopyroxenes fromspinel peridotite xenoliths from southwestPoland.Chemical Geology,111:227～243.
Brey G P,Kohler T.1990.Geothermobarometry in four-phaselherzolites II.Newthermobarometers and practical assessmentof existing thermobarometers.Journal of Petrology,31:1352～1378.
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Fan Q C,Sui J L,Liu R X,Wei H Q,Li N.2000.Petrology andgeochemistry of Jinlongdingzi active volcano-the most recentbasaltic explosive volcano at Longgang.Chinese Journal ofGeochemistry,19(4):312～317.
Fan W M,Menzies M A.1992.Destruction of aged lowerlithosphere and accretion of asthenosphere mantle beneatheastern China.Geotectonica et Metallogenia,16:171～180.
Gao S,Liu X M,Yuan H L,Hattendorf B,Gunther D,Chen L,Hu S H.2002.Determination of forty two major and traceelements in USGS and NIST SRM glasses by laser ablation-inductively coupled plasma-mass spectrometry.GeostandardsNewsletter,26(2):181～196.
Gao S,Rudnick R L,Yuan HL,Liu X M,Liu YS,Xu WL,LingWL,Ayers J,Wang X C,Wang Q H.2004.Recyclinglowercontinental crust in the North China craton.Nature,432:892～897.
Griffin W L,Zhang A D,O’Reilly S Y,Ryan C G.1998.Phanerozoic evolution of the lithosphere beneath the Sino-Korean Craton.In:Flower Met al.(eds.),Mantle Dynamicsand Plate Interactions in East Asia.Amecian GeophysicalUnion,Washington,DC,107～126.
Hellebrand E,Snow J E,Dick H J B,Hof mann A W.2001.Coupled major and trace elements as indicators of the extent ofmeltingin mid-ocean-ridge peridotites.Nature,410:677～681.
Johnson K T M,Dick H J B,Shimizu N.1990.Melting in theoceanic upper mantle:an ion microprobe study of diopsides inabyssal peridotites.Journal of Geophysical Research,95:2661～2678.
Liu D Y,Nut man A P,Compston W,Wu J S,Shen Q H.1992.Remnants of≥3800Ma crust in the Chinese part of the Sino-Korean craton.Geology,20:339～342.
McDonough WF,Sun S S.1995.The composition of the Earth.Chemical Geology,120:223～253.
Meen J K.1987.Mantle metasomatism and carbonates:anexperimental study of a complex relationship.Geol.Soc.Am.Spec.Pap,215:91～100.
Menzies M A.1990.Continental Mantle.London:Oxford SciencePublications,1～184.
Menzies M A,Fan W M,Zhang M.1993.Paleozoic and Cenozoiclithoprobes and the loss of>120km of Archaean lithosphere,Sino-Korean craton,China.In:Prichard H Met al.(eds.),Magmatic Processes and Plate Tectonics.Geological SocietySpecial Publication,76:71～81.
Nixon P H.1987.Kimberlitic xenoliths and their cratonic setting.In:Nixon P H(eds.),Mantle Xenoliths.Wiley Chichester,215～239.
Norman M D.1998.Melting and metasomatismin the continentallithosphere:laser ablation ICPMS analysis of minerals in spinellherzolites fromeastern Australia.Contributions to Mineralogyand Petrology,130:240～255.
O'Reilly S Y,Griffin W L.1996.4-D lithosphere mapping:methodology and examples.Tectonophysics,262:3～18.
Sachtleben T,Seck H A.1981.Chemical control of Al-solubilityinorthopyroxene and its implications on pyroxenegeothermometry.Contributions to Mineralogy and Petrology,78:157～165.
Stalder R,Foley S F,Brey G P,Horn I.1998.Mineral-aqueousfluid partitioning of trace elements at900～1200℃and3.0～5.7Gpa:newexperimental data for garnet,clinopyroxene,andrutile,and implications for mantle metasomatism.Geochimicaet Cosmochimica Acta,62:1781～1801.
Wells P R A.1977.Pyroxene thermometry in simple and complexsystems.Contributions to Mineralogy and Petrology,62:129～139.
Wang J Y,Chen MX,Wang J A,Deng X.1985.On the evolutionof the geothermal regime of the North China basin.Journal ofGeodynamics,4:133～148.
Xu J W,Zhu G.1994.Tectonic models of the Tanlu fault zone,eastern China.International Geology Review,36:771～784.
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