陕西省洛南县长岭碱性杂岩体锆石U-Pb年代学及岩石地球化学特征
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摘要
长岭碱性杂岩体位于华北陆块南缘洛南台缘褶皱带,侵位于中元古界长城系熊耳群和高山河群,主要岩石类型为石英正长岩和霓辉正长岩。开展了石英正长岩主量元素、稀土元素、微量元素分析和LA-ICP-MS锆石U-Pb定年。研究结果显示:岩石为过碱质系列。稀土元素具有弱Eu正异常,表现出轻稀土富集,重稀土亏损。微量元素具有亏损Ti、Ce、Ta、Nb、相对亏损P等高场强元素,富集大离子亲石元素的特点。δEu-(La/Yb)N图解中,两类岩石样品落在壳幔型区域,说明岩浆起源可能与壳幔相互作用有关;LA-ICP-MS锆石U-Pb表明其形成年龄为(265.3±1.5)Ma,为晚二叠世早期岩浆活动产物。长岭正长岩形成于拉张的构造环境,由受俯冲组分改造的岩石圈地幔物质与部分熔融的地壳物质混合形成。
Changling alkaline complex is located in Luonan platform margin fold belt at the southern edge of the North China Craton,invading in Mesoproterozoic strata of Xiong'er and Gaoshanhe Group of Changcheng System.The complex mainly includes quartz syenite and aegirite syenite.Whole-rock major,rare,trace elements and zircon LA-ICP-MS U-Pb age of quartz-syenite are analyzed in this study.The result of the study indicated that the rock belong to weakly peralkaline rock;the quartz-syenite has∑REE positive Eu anomalies,with relative LREE enrichment and HREE depletion.All the rocks are enriched in LILEs and depleted in HFSEs(Ti,Ce,Ta,Nb,P)compared to the primitive mantle values.In theδEu-(La/Yb)Ndiagram,the projections of the rocks from the two types fall in the crust-mantle type region,suggested that the origin of magma may be related to crust-mantle interaction.Combined with former's researches,we concluded that the quartz-syenite formed in an extensional tectonic setting,and was a product of mixing of lithospheric mantle material and magma(derived from partial melting of crust).
Changling alkaline complex is located in Luonan platform margin fold belt at the southern edge of the North China Craton,invading in Mesoproterozoic strata of Xiong'er and Gaoshanhe Group of Changcheng System.The complex mainly includes quartz syenite and aegirite syenite.Whole-rock major,rare,trace elements and zircon LA-ICP-MS U-Pb age of quartz-syenite are analyzed in this study.The result of the study indicated that the rock belong to weakly peralkaline rock;the quartz-syenite has∑REE positive Eu anomalies,with relative LREE enrichment and HREE depletion.All the rocks are enriched in LILEs and depleted in HFSEs(Ti,Ce,Ta,Nb,P)compared to the primitive mantle values.In theδEu-(La/Yb)Ndiagram,the projections of the rocks from the two types fall in the crust-mantle type region,suggested that the origin of magma may be related to crust-mantle interaction.Combined with former's researches,we concluded that the quartz-syenite formed in an extensional tectonic setting,and was a product of mixing of lithospheric mantle material and magma(derived from partial melting of crust).
引文
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[25]郭波,朱赖民,李犇,等.华北陆块南缘华山和合峪花岗岩岩体锆石U-Pb年龄、Hf同位素组成与成岩动力学背景[J].岩石学报,2009,25(2):265-281.
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[27]高昕宇,赵太平,高剑峰,等.华北陆块南缘小秦岭地区早白垩世埃达克质花岗岩的LA-ICP-MS锆石U-Pb年龄Hf同位素和元素地球化学特征[J].地球化学,2012,41(4):303-325.
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[2]MENG Q R,ZHANG G W.Geologic framew ork and tectonic evolution of the Qinling orogen,central China[J].Tectonophysics,2000,323(3/4):183-196.(in Chinese with English abstract)
[3]卢欣祥.秦岭花岗岩大地构造图(附说明书)[M].西安:地图出版社,2000:33.
[4]王晓霞,王涛,齐秋菊,等.秦岭晚中生代花岗岩时空分布、成因演变及构造意义[J].岩石学报,2011,27(6):1573-1593.
[5]WANG X X,WANG T,ZHANG C L.Neoproterzoic,Paleozoic,and M esozoic granitoid magmatism in the Qinling Orogen,China:Constraints on orogenic process[J].Journal of Asian Earth Sciences(in Chinese with English abstract),2013,72:129-151.
[6]卢欣祥.龙王(石童)A型花岗岩地质矿化特征[J].岩石学报,1989(1):67-77.
[7]陆松年,李怀坤,陈志宏,等.秦岭中-新元古代地质演化及对RODINLA超级大陆事件的响应[M].北京:地质出版社,2003:194.
[8]段友强.华北陆块南缘碱性岩地球化学研究及其大地构造意义)[D].合肥:中国科学技术大学,2016:40-52.
[9]张正伟,朱炳泉,常向阳.东秦岭北部富碱侵入岩带岩石地球化学特征及构造意义[J].地学前缘,2003(4):507-519.
[10]曹晶,叶会寿,李正远,等.东秦岭磨沟碱性岩体年代学、地球化学及岩石成因[J].岩石矿物学杂志,2015,34(5):665-684.
[11]喻学惠.秦巴地区碱性岩与造山带构造演化关系及其特征[J].中国区域地质,1992(3):233-240.
[12]曾广策.河南嵩县南部碱性正长岩类的岩石特征及构造环境[J].地球科学,1990(6):635-642.
[13]吴成斌,侯广顺,向世红,等.东秦岭鱼池正长岩体岩石地球化学特征及稀有金属元素、稀土元素矿化[J].地质科技情报,2017,36(2):58-64.
[14]包志伟,王强,资锋,等.龙王(石童)A型花岗岩地球化学特征及其地球动力学意义[J].地球化学,2009,38(6):509-522.
[15]叶会寿,毛景文,徐林刚,等.豫西太山庙铝质A型花岗岩SHRIMP锆石U-Pb年龄及其地球化学特征[J].地质论评,2008(5):699-711.
[16]段友强,张正伟,杨晓勇.华北克拉通南缘张士英岩体大陆动力学背景:来自地球化学、锆石U-Pb年龄和Hf同位素的证据[J].岩石学报,2015,31(7):1995-2008.
[17]柳晓艳.华北克拉通南缘古-中元古代碱性岩岩石地球化学与年代学研究及其地质意义[D].北京:中国地质科学院,2011.
[18]WIEDENBECK M,ALLE P,CORFU F,et al.Three natural zirconstandards for U-Th-Pb,Lu-Hf,traceelement and REEanalyses[J].Geostandardsnewsletter,1995,19(1):1-23.
[19]ANDERSEN T.Correction of common lead in U-Pb analysesthatdonotreport204Pb[J].Chemical Geology,2002,192(1):59-79.
[20]苏蔷薇,张静,王文博.陕西秦岭梁岩体LA-ICP-MS锆石U-Pb年龄及其地质意义[J].现代地质,2016,30(5):994-1003.
[21]WU Y B,ZHENG Y F.Genesis of zircon and its constraints on interpretation of U-Pb age[J].Chinese Science Bulletin,2004,49(15):1554-1569.
[22]SUN S S,MCDONOUGH F W.Chemical and isotopic systematics of oceanic basalts:implications for mantle compostion and processes[J].Geological Society,London,Special Publications,1989,42(1):313-345.
[23]刘英俊.元素地球化学导论[M].北京:地质出版社,1987:23-44.
[24]孙书勤,张成江,赵松江.大陆板内构造环境的微量元素判别[J].大地构造与成矿学,2007,31(1):104-109.
[25]郭波,朱赖民,李犇,等.华北陆块南缘华山和合峪花岗岩岩体锆石U-Pb年龄、Hf同位素组成与成岩动力学背景[J].岩石学报,2009,25(2):265-281.
[26]王义天,叶会寿,叶安旺,等.小秦岭文峪和娘娘山花岗岩体锆石SHRIMP U-Pb年龄及其意义[J].地质科学,2010,45(1):167-180.
[27]高昕宇,赵太平,高剑峰,等.华北陆块南缘小秦岭地区早白垩世埃达克质花岗岩的LA-ICP-MS锆石U-Pb年龄Hf同位素和元素地球化学特征[J].地球化学,2012,41(4):303-325.
[28]HALLS H C,FAHRIG W F.Mafic dyke swarms[J].Geology Assoc Can Spec Paper,1987,34:331-348.
[29]邵济安,张履桥.华北北部中生代岩墙群[J].岩石学报,2002,18(3):312-318.
[30]FOLEY S,PECCERILLO A.Potassic and ultrapotassic magmas and their origin[J].Lithos,1992,28(3/6):181-185.
[31]MLLER D,GROVES D I.Potassic igneous rocks and associated gold-copper mineralization[M].Berlin,Springer-Verlag,1995:1-210.
[32]ROCK N M S.Lamprophyes[M].Glasgow:Blackie,1991:1-285.、