扬子陆核与陆缘新元古代岩浆事件对比及其构造意义——来自黄陵和汉南侵入杂岩ELA-ICPMS锆石U-Pb同位素年代学的约束
Neoproterozoic magmatic events within the Yangtze continental interior and along its northern margin and their tectonic implication: constraint from the ELA-ICPMS U-Pb geochronology of zircons from the Huangling and Hannan complexes
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摘要: 本文报道分别位于扬子克拉通核部和北缘的黄陵及汉南新元古代侵入杂岩体的惰性气体激光剥蚀-等离子体质谱(ELA-ICPMS)锆石U-Pb年代学研究及其构造意义分析.定年数据显示,黄陵地区的三斗坪、大老岭岩套分别形成于794±7和795±8Ma;晓峰浅成岩岩套形成于744±22Ma,不仅与震旦系莲沱组底部火山岩年龄相同,且同期热事件普遍记录于杂岩体内其它岩套.汉南杂岩体中五堵门岩体形成于789±10Ma,在分析误差范围内与三斗坪、大老岭岩套相同;天平河岩形成于863±10Ma,这是在扬子北缘首次识别出这期岩浆作用.在扬子陆核和北缘侵入杂岩中还分别发现了≈860Ma和945～931Ma的捕获锆石.此外,740Ma的后期热事件同样记录于汉南杂岩体,表明扬子陆块内部和北缘共同经历了790Ma的峰期中酸性岩浆作用和≈740Ma的后期强烈热改造事件,即事件具有克拉通范围的性质.与天平河岩体岩性相似、年龄相同的侵入岩体已在攀西多处地区发现,说明空间上860Ma岩浆作用在扬子北缘和西缘可能具延续性.作者认为,"晋宁期"具造山性质的构造运动开始的时间应以830Ma为限,于≈790Ma达到了以壳内物质重熔为主的大规模岩浆侵入事件的峰期,并在≈740Ma以短期内地壳运动由剧烈抬升向快速沉降的构造转换为造山作用结束的标志.本次研究成果为探讨扬子克拉通新元古代大规模岩浆作用与同期全球构造事件的相互关系提供了重要的同位素年代学约束.
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[1] Andersen T.2002. Correction of common lead in U-Pb analyses that do not report 204Pb.Chem.Geol.,192:59 -79
[2] Condie KC.1998. Episodic continental growth and supercontinents:a mantle avalanche connection? Earth Planet.Sci.Lett.,163:97 -108
[3] Condie KC.2002. The supercontinental cycle:are there two patterns of cyclicity? J.African Earth Sci.,35:179-183
[4] Feng R,Machado N and Ludden J.1993. Lead geochronology of zircon by LaserProbe-Inductively Coupled Plasma Mass Spectrometry (LPICPMS).Geochim.Cosmochim.Acta.,57:3479-3486
[5] Fryer BJ,Jackson SE and Longerich HP.1993. The application of laser ablation microprobe-inductively coupled plasma-mass spectrometry(LAM-ICP-MS) to in-situ (U)-Pb geochronology.Chem.Geol.,109:1-8
[6] Gao S,Zhang BR and Li ZJ.1990. Geochemical evidence for Proterozoic continental arc and continental-margin rift magmatism along the north margin of the Yangtze Craton,South China,Precambrian Res.,47:205-221
[7] Li XH,Li ZX,Ge W,Zhou H,Li W,Liu Y and Wingate MTD.2003. Neoproterozoic granitoids in South China:crustal melting above a mantle plume at ca.825 Ma? Precambrian Res.,122:45 -83
[8] Li XH,Liang XR,Sun M,Guan H and Malpas JG.2001. Precise 206pb/238 U age determination on zircons by laser ablation microprobe-inductively coupled plasma-mass spectrometry using continuous linear ablation.Chem.Geol.,175:209-219
[9] Li ZX,Li XH,Kinny PD,Zhou H,Wang J and Zhang S.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.Precambrian Res.,122:85-109
[10] Li ZX,Li XH,Zhou H and Kinny PD.2002. Grenvillian continental collision in South China:new SHRIMP U Pb zircon results and implications for the configuration of Rodinia.Geology,30:163 -166
[11] Liang XR,Li XH,Liu YK,Zhu BQ and Zhang HX.2000. U-Pb isotopic dating of young zircons by laser ablation microprobeinductively coupled plasma mass spectrometry (LAM-ICPMS).Geochimica,29(1):1 -5 (in Chinese with English abstract)
[12] 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
[13] Ling WL,Gao S,Ouyang JP,Zhang BR and Li HM.2002. Time and tectonic setting of the Xixiang Group:Constraints from zircon U-Pb geochronology and geochemistry.Science in China (D),45 (9):818 -831
[14] Ling WL,Gao S,Zhang BR,Li HM,Liu Y and Cheng JP.2003. Neoproterozoic tectonic evolution of the northwestern Yangtze craton,South China:implications for amalgamation and break-up of Rodinia Supercontinent.Precamb.Res.,122:111-140
[15] Liu HC,Zhu BQ and Zhang ZX.1998. A study on single zircon dating using LAM-ICPMS.Chin.Sci.Bull.,43 (10):1103-1106.(in Chinese)
[16] Liu HY.1991. The Sinian System in China.Beijing:Science Press,236(in chinese)
[17] Ludwig KR.2001. Users manual for Isoplot/Ex rev.2.49. Berkeley Geochronology Centre Special Publication No.1 a:56 pp
[18] Ma DQ,Du SH and Xiao ZF.2002. The origin of Huangling granite batholith.Acta Petrologica et Mineralogica,21 (2):151-161 (in Chinese with English abstract)
[19] Ma GG,Li HQ and Zhang ZC.1984. A study on the geochronological rang of the Sinian period in South China.Journal of Yichang Institute of Geology and Mineral Resources.8:1 -30 (in Chinese with English abstract)
[20] McCulloch MT and Bennett VC.1994. Progressive growth of the Earth\'s continental crust and depleted mantle:geochemical constraints.Geochim.Cosmochim.Acta,58:4717-4738
[21] Stein M and Hofmann AW.1994. Mantle plumes and episodic crustal growth.Nature,372:63-68
[22] Yan X,Chu ZY,Sun M,Xu P and Zhou XH.1998. A primary study on micro analysis of zircon 207 pb/206 Pb ratio using laser probe plasma mass spectrometer.Chin.Sci.Bull.,43(19):2101-2105.(in Chinese)
[23] Yuan HL.2002. Application of solution Nebulization and laser ablation ICP-MS in Geosciences.Ph D thesis.Wuhan:Graduate School,China University of Geosciences
[24] Zhang ZQ,Zhang,GW,Tang SH,Zhang QD and Zhang JH.2000. Geochronology of the Hannan intrusive complex to adjoin the Qinling orogen and its rapid cooling reason,Chin.Sci.Bull.,46(8):685-689
[25] Zhou MF,Kennedy AK,Sun M,Malpas J and Lesher CM.2002a.Neoproterozoic arc-related mafic intrusions along the northern margin of South China:Implications for the accretion of Rodinia.J.Geology,110:611 -618
[26] Zhou MF,Yan DP,Kennedy AK,Li Y and Ding J.2002b.SHRIMP U Pb zircon geochronological and geochemical evidence for Neoproterozoic arc-magmatism along the western margin of the Yangtze Block,South China.Earth Planet.Sci.Lett.,196:51 -67
[27] 梁细荣,李献华,刘永康,朱炳泉,张海祥.2000.激光探针等离子体质谱法(LAM-ICPMS)用于年轻锆石U-Pb定年.地球化学,29(1):.1-5
[28] 刘海臣,朱炳泉,张展霞.1998 LAM-ICPMS法用于单颗粒锆石定年研究.科学通报,43(10):1103-1106
[29] 刘鸿允.1991.中国震旦系.北京:科学出版社,p236
[30] 马大铨,杜绍华,肖志发.2002.黄陵花岗岩基的成因.岩石矿物学杂志21(2):151-161
[31] 马国干,李华芹,张自超.1984.华南地区震旦纪时限范围的研究.中国地质科学院宜昌地质矿产研究所所刊,8:1-30
[32] 阎欣,储著银,孙敏,徐平,周新华.1998.激光探针等离子体质谱法锆石微区207pb206Pb测定尝试.科学通报,43(19):2101-2105
[33] 袁洪林.2002.溶液进样和激光剥蚀等离子体质谱在地球化学中的应用.博士学位论文,武汉:中国地质大学研究生院
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