西准噶尔谢米斯台地区双峰式火山岩的发现及其地质意义
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摘要
西准噶尔谢米斯台地区是研究准噶尔洋盆构造演化的关键地区,新发现的双峰式火山岩为开展研究提供了直接的载体,对其物质组成特征、岩石地球化学特征和锆石U-Pb年代学等进行研究,判别成因机制和大地构造环境,对恢复造山带大地构造格局有着重要的意义。本次研究获得如下认识:该套双峰式火山岩为碱性玄武岩-钙碱性流纹岩组合,流纹岩LA-ICP-MS锆石U-Pb年龄(431.8±2.3)Ma;玄武岩来源于俯冲流体交代的地幔部分熔融,流纹岩来源于地壳物质的部分熔融;双峰式火山岩形成于早志留世弧后盆地初始演化阶段;结合前人的研究成果,认为西准噶尔谢米斯台地区在早古生代存在完整的沟-弧-盆体系。
The Xiemisitai region in the Western Junggar is a key region to investigate the tectonic evolution of the Junggar ocean basin. The discovery of the Xiemisitai bimodal volcanics and their composition,petrogeochemistry,and zircon U-Pb age are important to discriminate formation mechanism and tectonic setting,reconstruct the tectonic framework of Western Junggar orogenic belt. The following acquaintances were obtained by this paper. The bimodal volcanics are composed of alkaline basalt and calc-alkaline rhyolite,and the LA-ICPMS zircon U-Pb dating of the rhyolite is( 431. 8 ± 2. 3) Ma. The mafic magma was likely derived from partial melting of the mantle metasomatized by subduction-related fluid,and the felsic magma was derived from the partial melting of crust materials. The bimodal volcanics may have formed in an early Silurian incipient back-arc basin. Combined with previous studies,we suggest that there was a complete Early Paleozoic trench-arc-basin system in the Xiemisitai region,Western Junggar.
The Xiemisitai region in the Western Junggar is a key region to investigate the tectonic evolution of the Junggar ocean basin. The discovery of the Xiemisitai bimodal volcanics and their composition,petrogeochemistry,and zircon U-Pb age are important to discriminate formation mechanism and tectonic setting,reconstruct the tectonic framework of Western Junggar orogenic belt. The following acquaintances were obtained by this paper. The bimodal volcanics are composed of alkaline basalt and calc-alkaline rhyolite,and the LA-ICPMS zircon U-Pb dating of the rhyolite is( 431. 8 ± 2. 3) Ma. The mafic magma was likely derived from partial melting of the mantle metasomatized by subduction-related fluid,and the felsic magma was derived from the partial melting of crust materials. The bimodal volcanics may have formed in an early Silurian incipient back-arc basin. Combined with previous studies,we suggest that there was a complete Early Paleozoic trench-arc-basin system in the Xiemisitai region,Western Junggar.
引文
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[20]SHEN P,SHEN Y C,LI X H,et al.Northwestern Junggar Basin,Xiemisitai Mountains,China:A geochemical and geochronological approach[J].Lithos,2012,140/141:103-118.
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[25]WANG X L,ZHOU J C,QIU J S,et al.LA-ICP-MS U-Pb zircon geochronology of the Neoproterozoic igneous rocks from Northern Guangxi,South China:Implications for tectonic evolution[J].Precambrian Research,2006,145(1/2):111-130.
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[28]GROVE T L,DONNELLY-NOLAN J M.The evolution of young silicic lavas at Medicine Lake Volcano,California:implications for the origin of compositional gaps in calc-alkaline series lavas[J].Contributions to Mineralogy and Petrology,1986,92(3):281-302.
[29]MACDONALD R.Quaternary peralkaline silicic rocks and caldera volcanoes of Kenya[M]//FITTON J G,UPTON B G J.Alkaline Igneous Rocks.London:Geological Society of London,1987:313-333.
[30]李献华,周汉文,李正祥,等.川西新元古代双峰式火山岩成因的微量元素和Sm-Nd同位素制约及其大地构造意义[J].地质科学,2002,37(3):264-276.
[31]SHINJO R,KATO Y.Geochemical constraints on the origin of bimodal magmatism at the Okinawa Trough,an incipient back-arc basin[J].Lithos,2000,54(3/4):117-137.
[32]DOE B R,LEEMAN W P,CHRISTIANSEN R L,et al.Lead and strontium isotopes and related trace elements as genetic tracers in the Upper Cenozoic rhyolite-basalt association of the Yellowstone plateau volcanic field[J].Journal of Geophysical Research Atmospheres,1982,87(B6):4785-4806.
[33]HUPPERT H E,SPARKS R S J.The generation of granitic magmas by intrusion of basalt into continental crust[J].Journal of Petrology,1988,29(3):599-624.
[34]DAVIES G R,MACDONALD R.Crustal influences in the petrogenesis of the Naivasha basalt-comendite complex:Combined trace element and Sr-Nd-Pb isotope constraints[J].Journal of Petrology,1987,28(6):1009-1031.
[35]WENDLANDT R F,ALTHERR R,NEUMANN E R,et al.Petrology,Geochemistry,isotopes[M]//OLSEN K H.Continental Rifts:Evolution,Structure,Tectonics.Amsterdam:Elsevier,1995:47-60.
[36]LIGHTFOOT P C,NALDRETT A J,GORBACHEV N S,et al.Geochemistry of the Siberian Trap of the Noril'sk area,USSR,with implications for the relative contributions of crust and mantle to flood basalt magmatism[J].Contributions to Mineralogy and Petrology,1990,104(6):631-644.
[37]周刚,秦纪华,张招崇,等.新疆富蕴苏普特一带双峰式火山岩的发现及其地质意义[J].地质论评,2007,53(3):337-348.
[38]BEN O D,WHITE W M,PATCHETT J.The geochemistry of marine sediments,island arc magma genesis,and crust-mantle recycling[J].Earth&Planetary Science Letters,1989,94(1/2):1-21.
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[40]CONDIE K C.Geochemical changes in basalts and andesites across the archaean-proterozoic boundary:identification and significance[J].Lithos,1989,23(1/2):1-18.
[41]GERTISSER R,KELLER J.Trace element and Sr,Nd,Pb and O isotope variations in medium-K and high-K volcanic rocks from Merapi volcano,Central Java,Indonesia:Evidence for the involvement of subducted sediments in Sunda Arc magma genesis[J].Journal of Petrology,2003,44(3):457-489.
[42]PEARCE J A,KEMPTON P D,NOWELL G M,et al.Hf-Nd element and isotope perspective on the nature and provenance of mantle and subduction components in Western Pacific arc-basin systems[J].Journal of Petrology,1999,40(11):1579-1611.
[43]EWART A,COLLERSON K D,REGELOUS M,et al.Geochemical evolution within the Tonga-Kermadec-Lau arc-back-arc systems:the role of varying mantle wedge composition in space and time[J].Journal of Petrology,1998,39(3):331-368.
[44]TAYLOR R N,LAPIERRE H,VIDAL P,et al.Igneous geochemistry and petrogenesis of the Izu-Bonin forearc basin[J].Proceedings of the Ocean Drilling Program,1992,126:405-430.
[45]PEARCE J A,HARRIS N B W,TINDLE A G.Trace element discrimination diagrams for the tectonic interpretation of granitic rocks[J].Journal of Petrology,1984,25(4):956-983.
[46]赵磊,何国琦,朱亚兵.新疆西准噶尔北部谢米斯台南坡蛇绿岩带的发现及其意义[J].地质通报,2013,32(1):195-205.
[47]CHEN J F,HAN B F,JI J Q,et al.Zircon U-Pb ages and tectonic implications of Paleozoic plutons in northern West Junggar,North Xinjiang,China[J].Lithos,2010,115(1/4):137-152.
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[2]HILDRETH W.Gradients in silicic magma chambers:Implications for lithospheric magmatism[J].Journal of Geophysical Research,1981,86:10153-10192.
[3]BROPHY J G.Composition gaps,critical crystallinity,and fractional crystallization in orogenic(calc-alkaline)magmatic systems[J].Contributions to Mineralogy and Petrology,1991,109(2):173-182.
[4]CHRISTIAN P,PAQUETTE J L.A mantle-derived bimodal suite in the Hercynian Belt:Nd isotope and trace element evidence for a subduction-related rift origin of the Late Devonian Brevenne metavolcanics,Massif Central(France)[J].Contributions to Mineralogy and Petrology,1997,129(2):222-238.
[5]GEIST D,HOWARD K A,LARSON P.The generation of oceanic rhyolites by crystal fractionation:the basalt-rhyolite association at Volcan Alcedo,Galapagos Archipelago[J].Journal of Petrology,1995,36(4):965-982.
[6]GARLAND F,HAVKESWORTH C J,MANTOVANI M S M.Description and petrogenesis of the Parana Rhyolites,Southern Brazil[J].Journal of Petrology,1995,36(5):1193-1227.
[7]HARRIS L.The deep layers of a Paleozoic arc geochemistry of the Copley-Balaklala series,northern California[J].Earth&Planetary Science Letters,1987,85(4):386-400.
[8]HOCHSTAEDTER A G,GILL J B,MORRIS J D.Volcanism in the Sumisu Rift,II.Subduction and non-subduction related components[J].Earth&Planetary Science Letters,1990,100(1/3):195-209.
[9]COULON C,MALUSKI H,BOLLINGER C,et al.Mesozoic and Cenozoic volcanic rocks from central and southern Tibet:39Ar-40Ar dating,petrological characteristics and geodynamical significance[J].Earth&Planetary Science Letters,1986,79(3/4):281-302.
[10]钱青,王焰.不同构造环境中双峰式火山岩的地球化学特征[J].地质地球化学,1999,27(4):29-32.
[11]王焰,钱青,刘良,等.不同构造环境中双峰式火山岩的主要特征[J].岩石学报,2000,16(2):169-173.
[12]吕晓春,任冲,武睿,等.藏南隆子地区早白垩世双峰式火山岩的发现——来自SHRIMP锆石U-Pb年代学和锆石地球化学的证据[J].地质论评,2016,62(4):945-954.
[13]陈根文,邓腾,刘睿,等.西天山阿吾拉勒地区二叠系塔尔得套组双峰式火山岩地球化学研究[J].岩石学报,2015,31(1):105-118.
[14]耿新霞,柴凤梅,杨富全,等.新疆阿尔泰南缘达拉乌兹双峰式火山岩年龄及岩石成因[J].岩石学报,2010,26(10):2967-2980.
[15]王银喜,顾连兴,张遵忠,等.博格达裂谷双峰式火山岩地质年代学与Nb-Sr-Pb同位素地球化学特征[J].岩石学报,2006,22(5):1215-1225.
[16]刘书生,范文玉,罗茂金,等.老挝南部帕莱通双峰式火山岩锆石U-Pb定年及岩石地球化学特征[J].吉林大学学报(地球科学版),2014,44(2):540-553.
[17]陈彦,张志诚,李可,等.内蒙古西乌旗地区二叠纪双峰式火山岩的年代学、地球化学特征和地质意义[J].北京大学学报(自然科学版),2014,50(5):843-856.
[18]WINDLEY B F,ALEXEIEV D,XIAO W J,et al.Tectonic models for accretion of the Central Asian Orogenic Belt[J].Journal of the Geological Society,2007,164(12):31-47.
[19]孟磊,申萍,沈远超.新疆谢米斯台中段火山岩岩石地球化学特征、锆石U-Pb年龄及其地质意义[J].岩石学报,2010,26(10):3047-3056.
[20]SHEN P,SHEN Y C,LI X H,et al.Northwestern Junggar Basin,Xiemisitai Mountains,China:A geochemical and geochronological approach[J].Lithos,2012,140/141:103-118.
[21]LUDWIG R K.ISOPLOT:A plotting and regression program for radiogenic-isotope data.Version 2.53[R].Reston:U.S.Geological Survey,1998:1-40.
[22]ANDERSEN T.Correction of common lead in U-Pb analyses that do not report204Pb[J].Chemical Geology,2002,192(1/2):59-79.
[23]VAN ACHTERBERGH E,RYAN C G,JACKSON S E,et al.Data reduction software for LA-ICP-MS[M]//SYLVESTER P J.Laser-Ablation-ICPMS in the Earth Sciences:Principles and Applications.Ottawa:Mineralogical Association of Canada,2001:239-243.
[24]YUAN H L,GAO S,LIU X M,et al.Accurate U-Pb age and trace element determinations of zircon by laser ablation inductively coupled plasma-mass spectrometry[J].Geostandards and Geoanalytical Research,2004,28(3):353-370.
[25]WANG X L,ZHOU J C,QIU J S,et al.LA-ICP-MS U-Pb zircon geochronology of the Neoproterozoic igneous rocks from Northern Guangxi,South China:Implications for tectonic evolution[J].Precambrian Research,2006,145(1/2):111-130.
[26]BOYNTON W V.Geochemistry of the rare earth elements:Meteorite studies[M]//HENDERSON P.Rare Earth Element Geochemistry.Amsterdam:Elsevier,1984:63-114.
[27]SUN S S,MCDONOUGH W F.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes[M]//SAUNDERS A D,NORRY M J.Magmatism in Oceanic Basins.London:Geological Society of London,1989:313-345.
[28]GROVE T L,DONNELLY-NOLAN J M.The evolution of young silicic lavas at Medicine Lake Volcano,California:implications for the origin of compositional gaps in calc-alkaline series lavas[J].Contributions to Mineralogy and Petrology,1986,92(3):281-302.
[29]MACDONALD R.Quaternary peralkaline silicic rocks and caldera volcanoes of Kenya[M]//FITTON J G,UPTON B G J.Alkaline Igneous Rocks.London:Geological Society of London,1987:313-333.
[30]李献华,周汉文,李正祥,等.川西新元古代双峰式火山岩成因的微量元素和Sm-Nd同位素制约及其大地构造意义[J].地质科学,2002,37(3):264-276.
[31]SHINJO R,KATO Y.Geochemical constraints on the origin of bimodal magmatism at the Okinawa Trough,an incipient back-arc basin[J].Lithos,2000,54(3/4):117-137.
[32]DOE B R,LEEMAN W P,CHRISTIANSEN R L,et al.Lead and strontium isotopes and related trace elements as genetic tracers in the Upper Cenozoic rhyolite-basalt association of the Yellowstone plateau volcanic field[J].Journal of Geophysical Research Atmospheres,1982,87(B6):4785-4806.
[33]HUPPERT H E,SPARKS R S J.The generation of granitic magmas by intrusion of basalt into continental crust[J].Journal of Petrology,1988,29(3):599-624.
[34]DAVIES G R,MACDONALD R.Crustal influences in the petrogenesis of the Naivasha basalt-comendite complex:Combined trace element and Sr-Nd-Pb isotope constraints[J].Journal of Petrology,1987,28(6):1009-1031.
[35]WENDLANDT R F,ALTHERR R,NEUMANN E R,et al.Petrology,Geochemistry,isotopes[M]//OLSEN K H.Continental Rifts:Evolution,Structure,Tectonics.Amsterdam:Elsevier,1995:47-60.
[36]LIGHTFOOT P C,NALDRETT A J,GORBACHEV N S,et al.Geochemistry of the Siberian Trap of the Noril'sk area,USSR,with implications for the relative contributions of crust and mantle to flood basalt magmatism[J].Contributions to Mineralogy and Petrology,1990,104(6):631-644.
[37]周刚,秦纪华,张招崇,等.新疆富蕴苏普特一带双峰式火山岩的发现及其地质意义[J].地质论评,2007,53(3):337-348.
[38]BEN O D,WHITE W M,PATCHETT J.The geochemistry of marine sediments,island arc magma genesis,and crust-mantle recycling[J].Earth&Planetary Science Letters,1989,94(1/2):1-21.
[39]PEARCE J A,LIPPARD S J,ROBERTS S.Characteristics and tectonic significance of supra-subduction zone ophiolites[M]//KOKELAAR B P,HOWELLS M F.Marginal Basin Geology.London:Geological Society of London,1984:77-94.
[40]CONDIE K C.Geochemical changes in basalts and andesites across the archaean-proterozoic boundary:identification and significance[J].Lithos,1989,23(1/2):1-18.
[41]GERTISSER R,KELLER J.Trace element and Sr,Nd,Pb and O isotope variations in medium-K and high-K volcanic rocks from Merapi volcano,Central Java,Indonesia:Evidence for the involvement of subducted sediments in Sunda Arc magma genesis[J].Journal of Petrology,2003,44(3):457-489.
[42]PEARCE J A,KEMPTON P D,NOWELL G M,et al.Hf-Nd element and isotope perspective on the nature and provenance of mantle and subduction components in Western Pacific arc-basin systems[J].Journal of Petrology,1999,40(11):1579-1611.
[43]EWART A,COLLERSON K D,REGELOUS M,et al.Geochemical evolution within the Tonga-Kermadec-Lau arc-back-arc systems:the role of varying mantle wedge composition in space and time[J].Journal of Petrology,1998,39(3):331-368.
[44]TAYLOR R N,LAPIERRE H,VIDAL P,et al.Igneous geochemistry and petrogenesis of the Izu-Bonin forearc basin[J].Proceedings of the Ocean Drilling Program,1992,126:405-430.
[45]PEARCE J A,HARRIS N B W,TINDLE A G.Trace element discrimination diagrams for the tectonic interpretation of granitic rocks[J].Journal of Petrology,1984,25(4):956-983.
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