桂北新元古代强过铝花岗岩的成因:锆石年代学和Hf同位素制约
Petrogenesis of the Neoproterozoic strongly peraluminons granitoids from Northern Guangxi:constraints from zircon geochronology and Hf isotopes.
-
摘要: 处于江南造山带的西端的桂北发育有大量前寒武纪火成岩,其中,强过铝花岗岩所占面积大于90%,镁铁-超镁铁质岩大约为8%。强过铝的花岗岩在地球化学特征上可分为花岗闪长岩和花岗岩两种类型。一些学者认为它们的形成与(超级)地幔柱活动和Rodinia超大陆的裂解有关。本文对桂北地区的花岗岩进行了La-ICP-MS锆石U-Pb年代学和La-MC-ICP- MS锆石Hf同位素研究,寨滚、本洞、峒马、三防和田朋岩体的形成年龄分别为835.8±2.5 Ma,822.7±3.8 Ma,824±13 Ma,804.3±5.2 Ma和794.2±8.1 Ma。定年结果表明,地球化学特征不同的两类花岗岩成岩年龄也不相同:花岗闪长岩的年龄为835~820 Ma,花岗岩则形成于810~800 Ma期间。锆石核部8个分析点和捕获锆石2个分析点给出了870 Ma到950 Ma的新元古代早期年龄值,可能记录了本区与江南造山带东部对应的950~870 Ma期间俯冲或碰撞导致的岩浆事件。本洞、三防和田朋岩体锆石的(~(196)Hf/~(177)Hf)_i比值分别为0.282176±0.000021、0.282149±0.000021和0.282175±0.000030。其ε(?)(t)值、Hf模式年龄与它们的ε_(Nd)(t)值、Nd模式年龄所展现出来的特征一致,表明桂北强过铝花岗岩主要是由基底沉积岩系部分熔融形成的,花岗闪长岩的源区有相对更多的幔源镁铁质组分。桂北这些花岗岩的年龄揭示了一个大约35Ma的岩浆事件,其形成不能用岩浆活动周期短(通常为1~5Ma)的地幔柱模型解释。这些花岗岩在构造判别图解中也位于碰撞和后碰撞区,形成于扬子和华夏板块间的碰撞高峰(约870Ma)之后,应属后碰撞花岗岩类。在俯冲板片折断和岩石圈拆沉之后,深部地幔的上涌和所伴随的拉张作用可能会导致基底岩石部分熔融产生了这些强过铝花岗岩。
-
[1] Amelin Y,Lee DC,Halliday AN.2000. Early-middle Archean crustal evolution deduced from Lu-Hf and U-Pb isotopic studies of single zircon grains.Geochim.Cosmochim.Acta,64:4205-4225
[2] Andersen T.2002. Correction of common lead in U-Pb analyses that do not report 204pb.Chem.Geol.,192:59-79
[3] BGMRGX (Bureau of Geology and Mineral Resources of Guangxi province),1985. Regional Geology of Guangxi Autonomous Region.Beijing:Geological Publishing House,pp.1 -853 (in Chinese with English abstract)
[4] Black LP,Kamo SL,Williams IS,Mundil R,Davis DW,Korsch RJ and Foudoulis C.2003. The application of SHRIMP to Phanerozoic geochronology:a critical appraisal of four zircon standards.Chem.Geol.,200:171 -188
[5] Blichert-Toft J,Chauvel C and Albarede F.1997. Separation of Hf and Lu for high-precision isotope analysis of rock samples by magnetic sector-multiple collector ICP MS.Contrib.Mineral.Petrol.,127:248-260
[6] Bonin B.2004. Do coeval mafic and felsic magmas in post-collisional to within-plate regimes necessarily imply two contrasting,mantle and crustal,sources? A review.Lithos,78:1-24
[7] Bonin B,Sekkal AA,Bussy F and Ferrag S.1998. Alkali-calcic and alkaline post-orogenic granite magmatism:Petrologic constraints and geodynamic settings.Lithos,45:45 -70
[8] Campbell IH and Griffiths RW.1990. Implications of mantle plume structure for the evolution of flood basalts.Earth Planet.Sci.Lett.,99:79-93
[9] Chappell BW and White A JR.1974. Two contrasting granite types.Pac.Geol.,3:173-174
[10] Chen JF,Folan KA,Xing FM,Xu X and Zhou TX.1991. Magmatism along the southeast margin of the Yangtze block:Precambrian collision of the Yangtze and Cathysia blocks of China.Geology,19:815 -818
[11] Chen JF and Jahn BM.1998. Crustal evolution of southeastern China:evidence from Sr,Nd and Pb isotopic compositions of granitoids and sedimentary rocks.Tectonophysics,284:101-133
[12] Chen YC,Mao JW,et al.1995. Metallogenic series of ore deposits and metallogenic evolution through geological history in North Guangxi.Nanning:Guangxi Science and Technology Press,pp.1 -433 (in Chinese)
[13] Clemens JD.2003. S-type granitic magmas-petrogenetic issues,models and evidence.Earth Sci.Rev.,61:1-18
[14] Condie KC.2001. Mantle plumes and their records in Earth history.Cambridge University Press,Oxford,UK,pp.1-306
[15] Davies JH and Blanckenburg FV.1995. Slab breakoff:A model of lithosphere detachment and its test in the magmatism and deformation of collisional orogens.Earth Planet.Sci.Lett.,129:85-102
[16] De SK,Chacko T,Creaser RA and Muehlenbachs K.2000. Geochemical and Nd-Pb-O isotope systematics of granites from the Taltson Magmatic zone,NE Alberta:Implications for early Proterozoic tectonics in western Laurentia.Precam.Res.,102:221 -249
[17] Ge WC,Li XH,Li ZX,Wang J,Zhou HW and Li JY.2000. Geological and geochemical evidence for the genesis of the tremolitized mafic rocks from Baotan in northern Guangxi.Geochimica,29:253 -258(in Chinese with English Abstract)
[18] Ge WC,Li XH,Li ZX,Zhou HW and Li JY.2001. Geochemical studies on two types of Neoproterozoic peraluminous granitoids in northern Guangxi.Geochimica,30 (1):24-34 (in Chinese with English Abstract)
[19] Goolaerts A,Mattielli N,de Jong J,Weis D and Scoates JS.2004. Hf and Lu isotopic reference values for the zircon standard 91500 by MC-ICP-MS.Chem.Geol.,206:1 -9
[20] Guo LZ,Shi YS and Ma RS.1980. The geotectonic framework and crustal evolution of South China.In:Scientific paper on geology for international exchange.Beijing:Geological Publishing House,pp.109 -116 (in Chinese with English Abstract)
[21] Hames WE,Renne PR and Ruppel C.2000. New evidence for geologically instantaneous emplacement of earliest Jurassic Central Atlantic magmatic province basalts on the North American margin.Geology,28:859-862
[22] Hamilton MA,Pearson DG,Thompson RN,Kelley SP and Emeleus CH.1998. Rapid eruption of Skye lavas inferred from precise U-Pb and Ar-Ar dating of the Rum and Cuillin plutonic complexes.Nature,394:260-263
[23] Harris NBW,Pearce JA and Tindle AG.1986. Geochemical characteristics of collision-zone magmatism.In:Coward MP,Ries A C (eds.),Collision Tectonics,Vol.19. Geol.Soc.Spec.Publ.,67-81
[24] Hofmann C,Féraud G and Courtillot V.2000.40Ar/39 Ar dating of mineral separates and whole rocks from the western Ghats lava pile:further constraints on duration and age of the Deccan traps.Earth Planet.Sci.Lett.,180:13-27
[25] Jackson SE,Pearson NJ,Griffin WL and Belousova EA.2004. The application of laser ablation-inductively coupled plasma-mass spectrometry to in situ U-Pb zircon geochronology.Chemical Geology,211:47 -69
[26] Li XH.1999. U-Pb zircon ages of granites from the southern margin of the Yangtze margin:timing of Neoproterozoic Jinning Orogen in SE China and implication for Rodinia assembly.Precam.Res.,97:43-57
[27] Li XH,Li ZX,Ge WC,Zhou HW,Li WX,Liu Y and Wingate MTD.2003. Neoproterozoic granitoids in South China:crustal melting above a mantle plume at ca.825Ma? Precam.Res.,122:45 -83
[28] Li XH,Zhao ZH,Gui XT and Yu JS.1991. Sm-Nd isotopic and zircon U-Pb constraints on the age of formation of the Precambrian crust in southeast China.Geochimica,(3):255-264 (in Chinese with English Abstract)
[29] Li ZX,Li XH,Kinny PD and Wang J.1999. The breakup of Rodinia:Did it start with a mantle plume beneath South China.? Earth Planet.Sci.Lett.,173:171 -181
[30] Li ZX,Li XH,Kinny PD,Wang J,Zhang S and Zhou HW.2003. Geochronology of Neoproterozoic syn-rift magmatism in the Yangtze Craton,South China and correlations with other continents:evidence for a mantle superplume that broke up Rodinia.Precam.Res.,122:85-109
[31] Liégeois JP.1998. Some words on the post-collisional magmatism.Lithos,45:XV-Xvii
[32] Ling HF,Shen WZ,Wang RC and Xu SJ.2001. Geochemical characteristics and genesis of Neoproterozoic granitoids in the northwestern margin of the Yangtze block.Phys.Chem.Earth (A),26:805-819
[33] Liu HY.1991. Sinian System of China.Beijing:Geological Publishing House (in Chinese)
[34] Ludwig KR.1991. ISOPLOT:A plotting and regression program for radiogenic-isotope data.U.S.Geological Survey Open-file Report,39
[35] MacKenzie DP and Bickle MJ.1988. The volume and composition of melt generated by extension of the lithosphere.J.Petrol.,29:625-679
[36] Maniar PD and Piccolli PM.1989. Tectonic discrimination of granitoid.Geol.Soc.Am.Bull.,101:635-643
[37] Middlemost EAK.1994. Naming materials in the magma/ igneous rock system.Earth-Sci.Rev.,37:215-224
[38] Patino Douce AE and McCarthy TC.1998. Melting of crustal rocks during continental collision and subduction.In:Hacker BR and Liou JG(eds).1998. When continents collide:geodynamics and Geochemistry of ultrahigh-pressure rocks.Kluwer Academic Publishers
[39] Pearce JA.1996. Sources and settings of granitic rocks.Episodes,19:120-125
[40] Pearce JA,Harris NBW and Tindle AG.1984. Trace element discrimination diagrams for the tectonic interpretation of granitic rocks.J.Petrol.,25:956-983
[41] Qiu JS,Zhou JC,Zhang GH and Ling WL.2002. Geochemistry and petrogenesis of Precambrian granitoid rocks in Northern Guangxi.Acta Petrologica et Mineraligica,21:197-208 (in Chinese with English Abstract)
[42] Scherer E,Munker C and Mezger K.2001. Calibration of the lutetiumhafnium clock.Science,293:683 -687
[43] Shu LS,Shi YS,Guo LZ,Charvet J and Sun Y(eds).1995. Plate tectonic evolution and the kinematics of collisional orogeny in the Middle Jiangnan,Eastern China.Nanjing University Publ.(in Chinese with English Abstract)
[44] Shu LS,Zhou GQ,Shi YS and Yin J.1994. Study of high pressure metamorphic blueschist and its late Proterozoic age in the eastern Jiangnan belt.Chin.Sci.Bull.,39:1200-1204
[45] Sylvester PJ.1998. Post-collisional strongly peraluminous granites.Lithos,45:29-44
[46] Vernikovsky VA,Pease VL,Vernikovskaya AE,Romanov AP and Gee DG,Travin AV.2003. First report of early Triassic A-type granite and syenite intrusions from Taimyr:product of the northern Eurasian superplume? Lithos,66:22-36
[47] Vervoort JD,Patchett PJ,Sodedund U and Baker M.2004. Isotopic composition of Yb and the determination of Lu concentrations and Lu/Hf ratios by isotopic dilution using MC-ICPMS.G3 5,2004 GC000721
[48] Wang J.2000. Neoproterozoic rifting history of south China:significance to Rodinia breakup.Beijing:Geological Publishing House (in Chinese with English Abstract)
[49] Wang XL,Zhou JC,Qiu JS and Gao JF.2004a.Comment on Neoproterozoic granitoids in South China:crustal melting above a mantle plume at ca.825Ma?\' by Xian-Hua Li et al.(PR 122:45-83,2003).Precam.Res.,132:401 -403
[50] Wang XL,Zhou JC,Qiu JS and Gao JF.2004b.Geochemistry of the Meso-to Neoproterozoic basic-acid rocks from Hunan Province,South China:implications for the evolution of the western Jiangnan orogen.Precam.Res.,135:79-103
[51] Wang XL,Zhou JC,Qiu JS and Gao JF,2004c.Petrogenesis of Neoproterozoic peraluminous granites from Northeastern Hunan Province:chronological and geochemical constraints.Geological Review,50:65 -76 (in Chinese with English Abstract)
[52] White RS and McKenzie D.1995. Mantle plumes and flood basalts.J.Geophys.Res.,100:543 -585
[53] Williamson BJ,Shaw A,Downes H and Thirwall MF.1996. Geochemical constrains on the genesis of Hercynian two-mica leucogranites from the Massif Central France.Chem.Geol.,127:25-42
[54] Wu RX,Zheng YF and Wu YB.2005. Zircon U-Pb age,element and oxygen isotopic geochemistry of Neoproterozoic granodiorites in South Anhui.Acta Petrologica Sinica,21:587-606 (in Chinese with English Abstract)
[55] Xu P,Wu FY,Xie LW,Yang YH.2004. Hf isotopic compositions of the standard zircons for U-Pb dating.Chin.Sci.Bull.,49:1642-1648
[56] Xu XS and Zhou XM.1992. Precambrian S-type granitoids in South China and their geological significance.Journal of Nanjing University(Natural Sciences Edition),28:423 -430 (in Chinese with English Abstract)
[57] Yuan HL,Wu FY,Gao S,Liu XM,Xu P and Sun DY.2003. Determination of U-Pb age and rare earth element concentrations of zircons from Cenozoic intrusions in northeastern China by laser ablation ICP-MS.Chin.Sci.Bull.,48:2411 -2421
[58] Zhao GC and Cawood PA.1999. Tectonothermal evolution of the Mayuan assemblage in the Cathaysia Block:implications for Neoproterozoic collision-related assembly of the South China craton.Am.J.Sci.,299:309-339
[59] Zhao ZJ,Ma DQ,Lin HK,Yuan CL and Zhang XH.1987. A study on the Precambrian granitoids from Bendong and Sanfang massifs,Northern Guangxi,In:Yichang Institute of Geology and Mineral Resources.Research Reports of the Geology and Mineral,pp.1-27 (in Chinese with English Abstract)
[60] Zhou JC,Wang XL,Qiu JS and Gao JF.2004. Geochemistry of Mesoand Neoproterozoic mafic-ultramafic rocks from northern Guangxi,China:arc or plume magmatism? Geochemical Journal,38:139 -152
计量
- 文章访问数: 8322
- PDF下载数: 7149
- 施引文献: 0