冈底斯南缘变形花岗岩锆石U-Pb年龄和Hf同位素组成：新特提斯洋早侏罗世俯冲作用的证据

张宏飞 徐旺春 郭建秋 宗克清 蔡宏明 袁洪林

冈底斯南缘变形花岗岩锆石U-Pb年龄和Hf同位素组成：新特提斯洋早侏罗世俯冲作用的证据

张宏飞徐旺春郭建秋宗克清蔡宏明袁洪林

- [1]中国地质大学地质过程与矿产资源国家重点实验室和地球科学学院,武汉430074 [2]中国地质大学地质调查研究院,武汉430074 [3]西藏地质矿产勘查开发局地热地质大队,拉萨850000 [4]西北大学大陆动力学国家重点实验室,西安710069
基金项目:
国家自然科学基金（40521001）、教育部长江学者和创新团队发展计划（IRT0441）和中国地质调查局西藏冲江矿调项目资助.致谢感谢两位评审者对本文提出的宝贵意见.

修回日期: 2007-02-09

刊出日期: 2007-06-30

Zircon U-Pb and Hf isotopic composition of deformed granite in the southern margin of the Gangdise terrane, Tibet: Evidence for early Jurassic subduction of Neo-Tethyan oceanic slab

ZHANG HongFei, XU WangChun, GUO JianQiu, ZONG KeQing, CAI HongMing, and YUAN HongLin

Revised Date: 09 February 2007

Publish Date: 30 June 2007

摘要

摘要: 本文对产于冈底斯南缘一个变形花岗岩进行了主量元素、微量元素、原位锆石LA-ICP-MS U-Pb定年和锆石Hf同位素组成研究.结果表明,变形花岗岩为高硅（SiO2=73.38%～76.06%）钙碱性岩系,K2O/N%0=0.69.1.17.铝指数（A/CNK）=1.03～1.07,为弱过铝质岩石.变形花岗岩微量元素组成显示贫大离子亲石元素（e.g.Rb=47×10^-6～71×10^-6）和高场强元素（e.g.Nb=1.31×10^-6～-3.09×10^-6,Ta=0.23×10^-6 ～0.54×10^-6）,具有岛弧型花岗岩的地球化学属性.变形花岗岩锆石U-Pb年龄为178±1Ma,该年龄代表岩浆结晶年龄.锆石Hf同位素组成显示εHf（178Ma）值变化于＋14.1～＋17.7,表明变形花岗岩岩浆来自初生地壳物质的部分熔融.变形花岗岩的岩石成因与新特提斯洋向欧亚板块南缘的俯冲消减作用存在联系,其岩浆结晶年龄反映了新特提斯洋发生俯冲消减的开始时代不晚于早侏罗纪,说明了新特提斯洋经历了较长时间的演化.
- 变形花岗岩 /
- U-Pb定年 /
- Hf同位素组成 /
- 冈底斯块体 /
- 新特提斯洋
- Deformed granite /
- U-Pb zircon dating /
- Hf isotope /
- Gangdese belt. Neo-Tethyan ocean /
- Tibet

HTML全文

参考文献(32)

[1]	Altherton MP and Perford N.1993. Generation of sodium-rich magmas from newly underplated basaltic crust.Nature,362:144-146
[2]	Anderson T.2002. Correction of common lead in U Pb analyses that do not report 2004Pb.Chem.Geol.,192:59-79
[3]	Blichert-Toft J and Albarede F.1997. The Lu Hf geochemistry of chondrites and the evolution of the mantle-crust system.Earth Planet.Sci.Lett.,148:243-258
[4]	Chu MF,Chung SL,Song B,Liu DY,O\'Reilly SY,Pearson N,Ji J and Wen DJ.2006. Zircon U-Pb and Hf isotope constraints on the Mesozoic tectonics and crustal evolution of Southern Tibet.Geology,34:745-748
[5]	Chu NC,Taylor RN,Chavagnac V,Nesbitt RW,Boella RM,Milton JA,Germain CR.Bayon G and Burton K.2002. Hf isotope ratio analysis using multi-collector inductively coupled plasma mass spectrometry:An evaluation of isobaric intefference corrections.J.Anal.Atom.Spectrem.17:1567-1574
[6]	Coleman RG and Donato MM.1979. Oceanic Plagiogranite Revisited.In:Barker,F(Ed.),Trondhjemites,Dacites and Related Rocks.Elsevier.Amsterdam.149-168
[7]	DeBievre P and Taylor PDP.1993. Table of the isotopic composition of the dements.J.Mass.Spectrom.Ion Process.123:149
[8]	Geng QR,Pan GT,Wang LQ,Zhu DC and Liao ZL.2006. Isotopic geochronology of the volcanic rocks from the Yeba Formation in the Gangdise zone,Xizang.Sedimentary Geology and Tethyan Geology,26:1-7(in Chinese with English abstract)
[9]	G(o)pel C.All(e)gre CJ and Xu RH.1984. Lead isotopic study of the Xigaze ophiolite(Tibet):The problem of the relationship between magmatites (gabbros,dolerites,lavas) and tectonites (harzburgites).Earth Planet.Sci.Lett.,69:301-310
[10]	Hofmann AW.1988. Chemical difierentiation of the Earth:The relationship between mantle,continental crust.and oceanic crust.Earth Planet.Sci.Lott.,90:297-314
[11]	Jiang YH,Jiang SY,Ling HF and Dai BZ.2006. Low-degree melting of a metasomatized lithospheric mantle for the origin of Cenozoic Yulong monzogranite-porphyry.east Tibet:Geochemical and Sr Nd Pb Hf isotopic constraints.Earth Planet.Sci.Lett.,241:617-633
[12]	Liang YH,Chung SL,Liu D,O\'Reilly SY,Chu MF,Ji J,Song B and Pearson NJ.2004. Detrital zircon study along the Tsangpo River.SE Tibet:Eos,85:T53A-0466
[13]	Ludwig KR.2001. Users Mannal for Isoplot/Ex(rev.2.49):A Geochronological Toolkit for Microsoft Excel.Berkeley Geochronology Center.Special Publication No.la.55
[14]	Mah(e)o G,Bertrand H,Guiliot S,Vilia IM,Keller F and Capiez P.2004. The South Ladakh ophiolites(NW Himalaya,India):An intraoceanic theoleiitic arc origin with implication for the closure of the Neo Tethys.Chem.Geol.,203:273-303
[15]	McDermid IRC,Aitchison JC,Davis AM,Harrison TM and Grove M.2002. The Zedong terrane:A Late Jurassic intraoceanic magmatic arc with in the Yarlung-Tsangpo suture zone.southeastern Tibet.Chem.Geol.,187:267-277
[16]	Milier C,Thfni M,Frank W,Schuster R,Melcher F and Meisel T.2003. Geochemistry and tectono-magmatic affinity of the Yungbwa ophiolite,SW Tibet.Lithos.66:155-172
[17]	Mo XX,Dong GC,Zhao ZD,Zhou S,Wang L,Qiu RZ and Zhang FQ.2005. Spatial and temporal distribution and characteristics of granitoids in the Gangdese,Tibet and implication for crustal growth and evolution.Geological Journal of China Universities.11:281-290(in Chinese with English abstract)
[18]	Muir RG.Weaver SD and Bradshaw JD.1995. Geochemistry of the Cretaceous Separation Point batholiths,New Zealand:granitoid magmas formed by melting of mafic lithosphere.J.Geol.Soc.,London,152:689-701
[19]	Pan GT and Ding J.2004. Geological map of Qinghai-Tibet Plateau and its adjacent area.Chengdu:Map Press
[20]	Pearce JA,Harris NB and Tindle AG.1984. Trace element discrimination diagrams for the tectonic interpretation of granitic rocks.Jourual of Petrology,25:956-983
[21]	Petford N and Atherton M.1996. Na-rich partial melts from newly underplated basaltic crust:The Cordillera Blanca bathloith.Peru.Journal of Petrology,37:1491-1521
[22]	Scherer E.Munker C and Mezger K.2001. Calibration of the lutetiumhafnium clock.Science,293:683-687
[23]	Sun SS and MeDonough WF.1989. Chemical and isotopic systematics of oceanic basalts:implications for mantle composition and processes.In:Sunders A.D.and Norry M.J.(Eds),Magmatism in the Ocean Basins.London:Special Publications,42:313-345
[24]	Taylor SR and McLennan SM.1985. The continental Crust:Its composition and Evolution.Oxford:Blackwell Scientific Publication,1-132
[25]	Vervoort JD and Blichert-Toft J.1999. Evolution of the depleted mantle.Hf isotope evidence from juvenile rocks through time.Geochim.Cosmochim.Acta.63:533-556
[26]	Wu FY,Yang YH,Xie LW,Yang JH and Xu P.2006. Hf isotopic compositions of the standard zircons and baddeleyites used in UPb geochronology.Chem.Geol.,234:105-126
[27]	Yin A and Harrison TM.2000. Geologic evolution of the HimalayanTibetan orogen.Annu.Rev.Earth Planet.Sci.,28:211-280
[28]	Yuan HL,Gao S,Liu XM,Li HM,Gunther D and Wu FY.2004. Accurate U-Pb age and trace element determinations of zircon by laser ablation-inductively coupled plasma mass spectrometry.Geostand.Newsl.,28:353-370
[29]	Zhang HF,Gao S,Zhong ZQ,Zhang BR,Zhang L and Hu SH.2002. Geochemical and Sr Nd Pb isotopic compositions of Cretaceous granitoids:Constraints on tectonic framework and crustal structure of the Dabieshan ultrahigh pressure metamorphic belt China.Chem.Geol.,186:281-299
[30]	Zhou S.Mo XX and Mahoney JJ.2002. Geochronology and Nd and Pb isotope characteristics of gabbro dikes in the Luobusha ophiolite,Tibet.Chinese Science Bulletin,47:143-146
[31]	耿全如,潘桂棠,王立全,朱弟成,廖忠礼.2006.西藏冈底斯带叶巴组火山岩同位素地质年代.沉积与特提斯地质,26:1-7
[32]	莫宣学,董国臣,赵志丹,周肃,王亮亮,邱瑞照,张风琴.2005.西藏冈底斯带花岗岩的时空分布特征及地壳生长演化信息.高校地质学报.11:281-290

施引文献

资源附件(0)

访问统计

点击查看大图

计量

文章访问数: 10138
PDF下载数: 11709
施引文献: 0

冈底斯南缘变形花岗岩锆石U-Pb年龄和Hf同位素组成：新特提斯洋早侏罗世俯冲作用的证据

Zircon U-Pb and Hf isotopic composition of deformed granite in the southern margin of the Gangdise terrane, Tibet: Evidence for early Jurassic subduction of Neo-Tethyan oceanic slab

计量

出版历程

目录