中阿尔泰造山带北缘早泥盆世构造环境探讨:来自托普色克他乌地区过铝质花岗岩年代学和地球化学的制约
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摘要
中阿尔泰造山带北缘早泥盆世花岗岩的年代学和地球化学研究,对探讨该地区早泥盆世构造格架和演化过程具有重要意义。针对侵入于喀纳斯群哲里开特组的托普色克他乌花岗闪长岩体进行LA-ICP-MS锆石U-Pb定年,获得其~( 206)Pb/~(238)U加权平均年龄为404 Ma±3.2 Ma(MSWD=0.32),为早泥盆世岩浆活动的产物。全岩地球化学分析表明,岩石具有高硅(w_(SiO2)
Geochronological and geochemical studies of Early Devonian granitoids in the northern margin of the central Altai orogenic belt are significant for the investigation of early Paleozoic tectonic framework and evolution. In this paper,LA-ICP-MS zircon U-Pb dating for granodiorite that intruded into the Zhelikaite formation of the Kanasi Group in northern margin of the central Altai orogenic belt yielded a ~(206)Pb/~(238)U age of 404 Ma±3.2 Ma(MSWD=0.32),which represented the formation time of the early Devonian granodiorite. Whole-rock geochemical results show that the granodiorite is characterized by high silicon(w_(SiO2)
Geochronological and geochemical studies of Early Devonian granitoids in the northern margin of the central Altai orogenic belt are significant for the investigation of early Paleozoic tectonic framework and evolution. In this paper,LA-ICP-MS zircon U-Pb dating for granodiorite that intruded into the Zhelikaite formation of the Kanasi Group in northern margin of the central Altai orogenic belt yielded a ~(206)Pb/~(238)U age of 404 Ma±3.2 Ma(MSWD=0.32),which represented the formation time of the early Devonian granodiorite. Whole-rock geochemical results show that the granodiorite is characterized by high silicon(w_(SiO2)
引文
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[16] 王涛,李彬,陈静,等.东昆仑五龙沟地区早志留世花岗岩锆石年代学、地球化学特征及其地质意义[J].矿物岩石,2016,36(02):62-70.
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[20] Boztug D,Harlavan Y,Arehart G B, et al.K-Ar age,whole-rock and isotope geochemistry of A-type granitoids in the Divrigi-Sivas Region,easern-central Anatoli,Turkey[J].Lithos,2007,97(1-2):193-218.
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[22] Schiano P,Monzier M,Eissen J P, et al.Simple mixing as the major control of the evolution of volcanic suites in the Ecuadorian Andes[J].Contrib Mineral Petrol,2010,160(2):297-312.
[23] 邹瑜,农军年,郭尚宇,等.桂东南上木水岩体的成因:地球化学、锆石U-Pb年龄及Hf同位素制约[J].矿物岩石,2017,37(02):52-62.
[24] Ryerson F J,Watson E B.Rutile saturation in magmas:implications for Ti,Nb,Ta depletion in island-arc basalts[J].Earth & Planetary Science Letters,1987,86(2-4):225-239.
[25] 朱弟成,莫宣学,王立全,等.西藏冈底斯东部察隅高分异I型花岗岩的成因:锆石U-Pb年代学、地球化学和Sr-Nd-Hf同位素约束[J].中国科学(D辑:地球科学),2009,39(07):833-848.
[26] Harris N B W,Marzouki F M H,Ali S.The Jabel Sayd complex,Arabian shield:geochemical constraints on the origin of peralkaline and related granites[J].Journal of the Geological Society London,1986,143:287-295.
[27] Pearce J A,Harris N B,Tindle A G.Trace Element Discrimination Diagrams for the Tectonic Interpretation of Granitic Rocks[J].Journal of Petrology,1984,25(4):956-983.
[2] 邹天人,曹惠志,吴柏青.新疆阿尔泰造山花岗和非造山花岗岩及其判别标志[J].地质学报,1988,3:228-243.
[3] 袁超,孙敏,肖文交,等.阿尔泰山南缘花岗岩的锆石U-Pb年代学及其地球化学特征[A].全国岩石学与地球动力学研究会论文摘要集[C].杭州:2005.
[4] 王中刚,赵振华,邹天人.阿尔泰花岗岩类地球化学[M].北京:科学出版社,1998,1-152.
[5] Zhang Z C,Yan S H,Chen B L, et al.SHRIMP zircon U-Pb dating for subduction-related granitic rocks in the northern part of east junggar,Xinjiang[J].Chinese Science Bulletin,2006,51(8):952-962.
[6] 王涛,洪大卫,童英,等.中国阿尔泰造山带后造山喇嘛昭花岗岩体锆石SHRIMP年龄、成因及陆壳垂向生长意义[J].岩石学报,2005,21(3):640-650.
[7] 童英,王涛,洪大卫,等.阿尔泰造山带西段同造山铁列克花岗岩体锆石U-Pb年龄及构造意义[J].地球学报,2005,26(增刊):74-77.
[8] Windlely B F,Kr?ner A,Guo J, et al.Neoproterozoic to Paleozoic geology of the Altai orogen,NW China:New zircon age data and tectonic evolution[J].The Journal of Geology,2002,110:719-737.
[9] Anderson T.Correction of common Pb in U-Pb analyses that do not report 204Pb[J].Chemical Geology,2002,192(1-2):59-79.
[10] 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.
[11] 吴元保,郑永飞.锆石成因矿物学研究及其对U-Pb年龄解释的制约[J].科学通报,2004,16:1 589-1 604.
[12] Sun S S,Mcdonough W F.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes[M].London:Special Publications,1989,316-345.
[13] 黄博涛,董增产,潘峰,等.阿尔泰造山带青河地区早泥盆世和寒武纪末花岗岩的年代学、岩石成因及其地质意义[J].岩石矿物学杂志,2017,36(4):458-472.
[14] 童英,王涛,洪大卫,等.中国阿尔泰北部山区早泥盆世花岗岩的年龄、成因及构造意义[J].岩石学报,2007,23(8):1 933-1 944.
[15] Wang T,Hong D W,Jahn B M, et al.Timing,Petrogenesis,and setting of Paleozoic synorogenic intrusions from the Altai Mountains,northwest China:Implications for the tectonic evolution of an accretionary orogen[J].The Journal of Geology,2006,114:735-751.
[16] 王涛,李彬,陈静,等.东昆仑五龙沟地区早志留世花岗岩锆石年代学、地球化学特征及其地质意义[J].矿物岩石,2016,36(02):62-70.
[17] Barth M G,Mcdonough W F,Rudnick R L.Tracking the budget of Nb and Ta in the continental crust[J].Chemical Geology,2000,156(3-4):197-213.
[18] Dostal J,Chatterjee A K.Contrasting behaviour of Nb/Ta and Zr/Hf ratios in a peraluminous granitic pluton Nova Scoyia,Canada[J].Chemical Geology,2000,163(1-4):207-218.
[19] Sylvester P J.Post-collisinal strongly peraluminous granites[J].Lithos,1998,45(1-4):29-44.
[20] Boztug D,Harlavan Y,Arehart G B, et al.K-Ar age,whole-rock and isotope geochemistry of A-type granitoids in the Divrigi-Sivas Region,easern-central Anatoli,Turkey[J].Lithos,2007,97(1-2):193-218.
[21] Kaygusuz A,Siebel W,Sen C, et al.Petrochemistry and Petrology of I-Type Granitoids in an Arc Setting:the Composite Torul Pluton,Eastern Pontides,NE Turkey[J].International Journal of Earth Sciences,2008,97(4):739-764.
[22] Schiano P,Monzier M,Eissen J P, et al.Simple mixing as the major control of the evolution of volcanic suites in the Ecuadorian Andes[J].Contrib Mineral Petrol,2010,160(2):297-312.
[23] 邹瑜,农军年,郭尚宇,等.桂东南上木水岩体的成因:地球化学、锆石U-Pb年龄及Hf同位素制约[J].矿物岩石,2017,37(02):52-62.
[24] Ryerson F J,Watson E B.Rutile saturation in magmas:implications for Ti,Nb,Ta depletion in island-arc basalts[J].Earth & Planetary Science Letters,1987,86(2-4):225-239.
[25] 朱弟成,莫宣学,王立全,等.西藏冈底斯东部察隅高分异I型花岗岩的成因:锆石U-Pb年代学、地球化学和Sr-Nd-Hf同位素约束[J].中国科学(D辑:地球科学),2009,39(07):833-848.
[26] Harris N B W,Marzouki F M H,Ali S.The Jabel Sayd complex,Arabian shield:geochemical constraints on the origin of peralkaline and related granites[J].Journal of the Geological Society London,1986,143:287-295.
[27] Pearce J A,Harris N B,Tindle A G.Trace Element Discrimination Diagrams for the Tectonic Interpretation of Granitic Rocks[J].Journal of Petrology,1984,25(4):956-983.