吕梁地区宁家湾岩体锆石U-Pb年代学、地球化学特征及地质意义
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摘要
对呈小规模岩株状产出的宁家湾岩体进行野外地质、岩石学、岩石地球化学、锆石U-Pb同位素年代学和Hf同位素组成研究,目的是确定其岩石成因及地球动力学意义。两件样品的LA-ICP-MS锆石U-Pb定年结果分别为2364±6 Ma (MSWD=0.13)和2360±23 Ma (MSWD=4.0),属古元古代岩浆活动的产物。研究结果表明,宁家湾岩体富碱、高K和Si,具有高FeOT/MgO比值和高的高场强元素(HFSE)含量,富集Rb,Ba,Th和U等元素,具有低的Ca和Mg含量,明显亏损P和Ti,具弱轻重稀土分异和强Eu负异常(δEu=0.13～0.36)的海鸥型稀土分配模式,显示高分异I型花岗岩的特征。较高的Y/Nb值(1.2～2.8)、锆石的εHf(t)均为正值(+1.6～+6.4)以及单阶段模式年龄tDM1(Hf)和二阶段模式年龄tDM2(Hf)分别为2449～2629 Ma和2474～2711Ma的特点,表明源区可能为壳幔混合。明显的Nb,P和Ti负异常及Ce,Nd和Zr正异常,反映出大陆边缘弧岩浆岩的特征。结合区域地质背景,认为宁家湾岩体很可能形成于岛弧构造环境。
Field investigations, petrology, geochemistry, zircon U-Pb geochronology and Hf isotope analysis were performed to investigate the petrogenesis of Ningjiawan pluton, in an attempt to shed light on its geodynamic significance. LA-ICP-MS zircon U-Pb dating from two samples yielded ages of 2364±6 Ma(MSWD=0.13) and 2360±23 Ma(MSWD=4.0) respectively, indicating that the magma emplaced and crystalized in Paleoproterozoic. The pluton contains high concentrations of alkaline, K and Si, had elevated FeOT/MgO ratios and high field strength element(HFSE) contents, was enriched in Rb, Ba, Th and U elements, was depleted in Ca, Mg, P and Ti, and possessed a "seagull-type" chondrite-normalied REE pattern with significantly negative Eu anomalies(δEu =0.13-0.36) and enrichment in the LREE relative to the HREE, exhibiting the traits of the highly fractionated Itype granite. Relatively high whole-rock Y/Nb values(1.2-2.8), together with positive εHf(t) values(+1.6-+6.4), and tDM1(Hf) and tDM2(Hf) ages of 2449-2629 Ma and 2474-2711 Ma respectively on the zircon grains, signified that they were products derived from magma mixing between crust and depleted mantle sources. Moreover, distinctive negative Nb, P and Ti anomalies and positive Ce, Nd and Zr anomalies, characteristics of continental margin arc, combining with the regional geological background, indicate that Ningjiawan pluton is very likely to form in island arc setting.
Field investigations, petrology, geochemistry, zircon U-Pb geochronology and Hf isotope analysis were performed to investigate the petrogenesis of Ningjiawan pluton, in an attempt to shed light on its geodynamic significance. LA-ICP-MS zircon U-Pb dating from two samples yielded ages of 2364±6 Ma(MSWD=0.13) and 2360±23 Ma(MSWD=4.0) respectively, indicating that the magma emplaced and crystalized in Paleoproterozoic. The pluton contains high concentrations of alkaline, K and Si, had elevated FeOT/MgO ratios and high field strength element(HFSE) contents, was enriched in Rb, Ba, Th and U elements, was depleted in Ca, Mg, P and Ti, and possessed a "seagull-type" chondrite-normalied REE pattern with significantly negative Eu anomalies(δEu =0.13-0.36) and enrichment in the LREE relative to the HREE, exhibiting the traits of the highly fractionated Itype granite. Relatively high whole-rock Y/Nb values(1.2-2.8), together with positive εHf(t) values(+1.6-+6.4), and tDM1(Hf) and tDM2(Hf) ages of 2449-2629 Ma and 2474-2711 Ma respectively on the zircon grains, signified that they were products derived from magma mixing between crust and depleted mantle sources. Moreover, distinctive negative Nb, P and Ti anomalies and positive Ce, Nd and Zr anomalies, characteristics of continental margin arc, combining with the regional geological background, indicate that Ningjiawan pluton is very likely to form in island arc setting.
引文
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(1)据中华人民共和国地质图(1:200000)静乐幅(山西省地质局测绘队, 1971)修改
[2]Zhai M G,Santosh M.The Early Precambrian odyssey of the North China Craton:a synoptic overview.Gondwana Research,2011,20(1):6?25
[3]Zhao G C,Wilde S A,Cawood P A,et al.Archean blocks and their boundaries in the North China Craton:lithological,geochemical,structural and P-Tpath constraints and tectonic evolution.Precambrian Research,2001,107(1/2):45?73
[4]Zhao G C,Sun M,Wilde S A,et al.Late Archean to Paleoproterozoic evolution of the North China Craton:key issues revisited.Precambrian Research,2005,136(2):177?202
[5]Wilde S A,Zhao G C,Sun M.Development of the North China Craton during the Late Archaean and its final amalgamation at 1.8 Ga:some speculations on its position within a global Palaeoproterozoic supercontinent.Gondwana Research,2002,5(1):85?94
[6]Kr?ner A,Wilde S A,Li J H,et al.Age and evolution of a Late Archean to Paleoproterozoic upper to lower crustal section in the Wutaishan/Hengshan/Fuping terrain of northern China.Journal of Asian Earth Sciences,2005,24(5):577?595
[7]Kr?ner A,Wilde S A,O’Brien P J,et al.Field relationships,geochemistry,zircon ages and evolution of a Late Archaean to Palaeoproterozoic lower crustal section in the Hengshan terrain of Northern China.Acta Geologica Sinica(English Edition),2005,79(5):605?632
[8]Wilde S A,Zhao G C.Archean to Paleoproterozoic evolution of the North China Craton.Precambrian Research,2005,24(5):519?522
[9]Zhang J,Zhao G C,Li S W,et al.Deformation history of the Hengshan complex:implications for the tectonic evolution of the Trans-North China Orogen.Journal of Structural Geology,2007,29(6):933?949
[10]Kusky T M,Li J H.Paleoproterozoic tectonic evolution of the North China Craton.Journal of Asian Earth Sciences,2003,22(4):383?397
[11]Polat A,Herzberg C,Munker C,et al.Geochemical and petrological evidence for a suprasubduction zone origin of Neoarchean(ca.2.5 Ga)peridotites,central orogenic belt,North China Craton.Geological Society of America Bulletin,2006,118(7):771?784
[12]Li J H,Kusky T M.A Late Archean foreland fold and thrust belt in the North China Craton:implications for early collisional tectonics.Gondwana Research,2007,12(1):47?66
[13]Faure M,Trap P,Lin W,et al.Polyorogenic evolution of the Paleoproterozoic Trans-North China Beltnew insights from Lüliangshan-Hengshan-Wutaishan and Fuping massifs.Episode,2007,30(2):95?106
[14]Trap P,Faure M,Lin W,et al.Paleoproterozoic tectonic evolution of the Trans-North China Orogen:toward a comprehensive model.Precambrian Research,2012,222/223:191?211
[15]Zhao G C,Wilde S A,Cawood P A,et al.Thermal evolution of Archean basement rocks from the eastern part of the North China Craton and its bearing on tectonic setting.International Geology Review,1998,40(8):706?721
[16]耿元生,杨崇辉,万渝生.吕梁地区古元古代花岗岩浆作用--来自同位素年代学的证据.岩石学报,2006,22(2):305?314
[17]Zhao G C,Wilde S A,Sun M,et al.SHRIMP U-Pb zircon ages of granitoid rocks in Lüliang complex:implications for the accretion and evolution of the Trans-North China Orogen.Precambrian Research,2008,160(3/4):213?226
[18]王玺.华北中部吕梁地区古元古代构造演化的年代学与地球化学制约[D].南京:南京大学,2014
[19]赵娇,张成立,郭晓俊,等.华北吕梁地区2.4 Ga A型花岗岩的确定及地质意义.岩石学报,2015,31(6):1606?1620
[20]Whalen J B,Currie K L,Chappell B W.A-type granites:geochemical characteristics,discrimination and petrogenesis.Contributions to Mineralogy and Petrology,1987,95(4):407?419
[21]Nelson E G.Chemical subdivision of the A-type granitoids:petrogenetic and tectonic implications.Geology,1992,20(7):641?644
[22]吴福元,李献华,杨进辉,等.花岗岩成因研究的若干问题.岩石学报,2007,23(6):1217?1238
[23]李献华,李武显,李正祥.再论南岭燕山早期花岗岩的成因类型与构造意义.科学通报,2007,52(9):981?991
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[25]Andersen T.Correction of common lead in U-Pb analyses that do not report Pb-204.Chemical Geology,2002,192:59?79
[26]Hu Z C,Liu Y S,Gao S,et al.Improved in situ Hf isotope ratio analysis of zircon using newly designed X skimmer cone and jet sample cone in combination with the addition of nitrogen by laser ablation multiple collector ICP-MS.Journal of Analytical Atomic Spectrometry,2012,27(9):1391?1399
[27]Maniar P D,Piccoli P M.Tectonic discrimination of granitoids.Geological Society of America Bulletin,1989,101(5):635?643
[28]Peccerillo A,Taylor S R.Geochemistry of eocene calc-alkaline volcanic rocks from the Kastamonu area,Northern Turkey.Contributions to Mineralogy&Petrology,1976,58(1):63?81
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(1)据中华人民共和国地质图(1:200000)静乐幅(山西省地质局测绘队, 1971)修改
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