南岭中-晚侏罗世含铜铅锌与含钨花岗岩的成因差异:以湘南铜山岭和魏家矿床为例
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摘要
南岭地区中-晚侏罗世含铜铅锌与含钨花岗岩的矿物学和地球化学特征截然不同.含铜铅锌花岗岩主要为准铝质含角闪石的花岗闪长岩,具有较高的CaO/(Na_2O+K_2O)比值、LREE/HREE比值和δEu值,较低的Rb/Sr比值,Ba、Sr、P、Ti轻微亏损,分异演化程度较低.含钨花岗岩为高分异演化的过铝质花岗岩,其CaO/(Na_2O+K_2O)比值、LREE/HREE比值和δEu值较低,Rb/Sr比值较高,Ba、Sr、P、Ti强烈亏损.含铜铅锌花岗岩主要形成于155.2~167.0Ma,峰值为160.6Ma,含钨花岗岩主要形成于151.1~161.8Ma,峰值为155.5Ma,两者存在约5Ma的时差.在湘南铜山岭含铜铅锌和魏家含钨花岗岩系统研究基础上,结合南岭地区中-晚侏罗世含铜铅锌与含钨花岗岩的对比,提出了两类含矿花岗岩的成因模式.古太平洋板块俯冲导致软流圈上涌和玄武质岩浆底侵.底侵玄武质岩浆加热促使下地壳镁铁质角闪岩相基底首先发生部分熔融,形成与铜铅锌矿化有关的花岗闪长质岩浆.随着玄武质岩浆底侵,中-上地壳富白云母变质沉积基底发生部分熔融,形成与钨矿化有关的花岗质岩浆.花岗岩源区成分的差异导致花岗岩成矿专属性不同,源区部分熔融的时间先后导致了含铜铅锌与含钨花岗岩之间存在5Ma左右的时差.
引文
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Boynton W V.1984.Cosmochemistry of the rare earth elements:Meteorite studies.In:Henderson P,ed.Rare Earth Element Geochemistry.Amsterdam:Elsevier.63-114
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Dai B Z,Jiang S Y,Jiang Y H,Zhao K D,Liu D Y.2008.Geochronology,geochemistry and Hf-Sr-Nd isotopic compositions of Huziyan mafic xenoliths,southern Hunan Province,South China:Petrogenesis and implications for lower crust evolution.Lithos,102:65-87
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Jiang Y H,Jiang S Y,Dai B Z,Liao S Y,Zhao K D,Ling H F.2009.Middle to late Jurassic felsic and mafic magmatism in southern Hunan province,southeast China:Implications for a continental arc to rifting.Lithos,107:185-204
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Vielzeuf D,Montel J M.1994.Partial melting of metagreywackes.Part I.Fluid-absent experiments and phase relationships.Contrib Mineral Petrol,117:375-393
Wang Y J,Fan W M,Guo F.2003a.Geochemistry of early Mesozoic potassium-rich diorites-granodiorites in southeastern Hunan Province,South China:Petrogenesis and tectonic implications.Geochem J,37:427-448
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董少花,毕献武,胡瑞忠,陈佑纬.2014.湖南瑶岗仙复式花岗岩岩石成因及与钨成矿关系.岩石学报,30:2749-2765
高剑锋,陆建军,赖鸣远,林雨萍,濮巍.2003.岩石样品中微量元素的高分辨率等离子质谱分析.南京大学学报(自然科学版),39:844-850
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孔华,金振民,林源贤.2000.道县玄武岩中麻粒岩包体的岩石学及年代学.长春科技大学学报,30:115-119
李晓峰,胡瑞忠,华仁民,马东升,武丽艳,齐有强,彭建堂.2013.华南中生代与同熔型花岗岩有关的铜铅锌多金属矿床时空分布及其岩浆源区特征.岩石学报,29:4037-4050
濮巍,高剑锋,赵葵东,凌洪飞,蒋少涌.2005.利用DCTA和HIBA快速有效分离Rb-Sr、Sm-Nd的方法.南京大学学报(自然科学版),41:445-450
孙涛,周新民,陈培荣,李惠民,周红英,王志成,沈渭洲.2003.南岭东段中生代强过铝花岗岩成因及其大地构造意义.中国科学D辑:地球科学,33:1209-1218
王磊.2010.粤北大宝山钼多金属矿床成矿模式与找矿前景研究.博士学位论文.武汉:中国地质大学.119
王岳军,范蔚茗,郭锋,李惠民,梁新权.2001.湘东南中生代花岗闪长岩锆石U-Pb法定年及其成因指示.中国科学D辑:地球科学,31:745-751
魏道芳,鲍征宇,付建明.2007.湖南铜山岭花岗岩体的地球化学特征及锆石SHRIMP定年.大地构造与成矿学,31:482-489
谢银财,陆建军,马东升,章荣清,高剑锋,姚远.2013.湘南宝山铅锌多金属矿区花岗闪长斑岩及其暗色包体成因:锆石U-Pb年代学、岩石地球化学和Sr-Nd-Hf同位素制约.岩石学报,29:4186-4214
张怀峰,陆建军,王汝成,马东升,朱金初,章荣清.2014.广西栗木大岐岭隐伏花岗岩的成因及其构造意义:岩石地球化学、锆石U-Pb年代学和Nd-Hf同位素制约.中国科学:地球科学,44:901-918
张文兰.2004.赣南大吉山和漂塘花岗岩特征及成矿作用研究.博士学位论文.南京:南京大学.159
章荣清.2014.湘南含钨和含锡花岗岩成因及成矿作用:以王仙岭和新田岭为例.博士学位论文.南京:南京大学.193
赵盼捞,袁顺达,原垭斌.2016.湘南魏家钨矿区祥林铺岩体锆石LA-MC-ICP-MS U-Pb测年--对南岭西端晚侏罗世钨矿成岩成矿作用的指示.中国地质,43:120-131
朱金初,陈骏,王汝成,陆建军,谢磊.2008.南岭中西段燕山早期北东向含锡钨A型花岗岩带.高校地质学报,14:474-484
左昌虎,路睿,赵增霞,徐兆文,陆建军,王汝成,陈进全.2014.湖南常宁水口山Pb-Zn矿区花岗闪长岩元素地球化学、LA-ICP-MS锆石U-Pb年龄和Hf同位素特征.地质论评,60:811-823
Altherr R,Holl A,Hegner E,Langer C,Kreuzer H.2000.High-potassium,calc-alkaline I-type plutonism in the European Variscides:Northern Vosges(France)and northern Schwarzwald(Germany).Lithos,50:51-73
Beard J S,Lofgren G E.1991.Dehydration melting and water-saturated melting of basaltic and andesitic greenstones and amphibolites at 1,3,and 6.9 kb.J Petrol,32:365-401
Boynton W V.1984.Cosmochemistry of the rare earth elements:Meteorite studies.In:Henderson P,ed.Rare Earth Element Geochemistry.Amsterdam:Elsevier.63-114
Castro A,Stephens W E.1992.Amphibole-rich polycrystalline clots in calc-alkaline granitic rocks and their enclaves.Can Mineral,30:1093-1112
Dai B Z,Jiang S Y,Jiang Y H,Zhao K D,Liu D Y.2008.Geochronology,geochemistry and Hf-Sr-Nd isotopic compositions of Huziyan mafic xenoliths,southern Hunan Province,South China:Petrogenesis and implications for lower crust evolution.Lithos,102:65-87
F鰎ster H J,Tischendorf G,Trumbull R B.1997.An evaluation of the Rb vs.(Y+Nb)discrimination diagram to infer tectonic setting of silicic igneous rocks.Lithos,40:261-293
Gardien V,Thompson A B,Grujic D,Ulmer P.1995.Experimental melting of biotite+plagioclase+quartz±muscovite assemblages and implications for crustal melting.J Geophys Res,100:15581-15591
Hine R,Williams I S,Chappell B W,White A J R.1978.Contrasts between I-and S-type granitoids of the Kosciusko Batholith.J Geol Soc Aust,25:219-234
Huang X D,Lu J J.2014.Geological characteristics and Re-Os geochronology of Tongshanling polymetallic ore field,south Hunan,China.Acta Geol Sin-Engl Ed,88:1626-1629
Jiang Y H,Jiang S Y,Dai B Z,Liao S Y,Zhao K D,Ling H F.2009.Middle to late Jurassic felsic and mafic magmatism in southern Hunan province,southeast China:Implications for a continental arc to rifting.Lithos,107:185-204
Li X H.1997.Timing of the Cathaysia Block formation:Constraints from SHRIMP U-Pb zircon geochronology.Episodes,20:188-192
Li X H,Chung S L,Zhou H W,Lo C H,Liu Y,Chen C H.2004.Jurassic intraplate magmatism in southern Hunan-eastern Guangxi:40Ar/39Ar dating,geochemistry,Sr-Nd isotopes and implications for the tectonic evolution of SE China.Geol Soc Lond Spec Publ,226:193-215
Mao J W,Chen Y B,Chen M M,Pirajno F.2013.Major types and time-space distribution of Mesozoic ore deposits in South China and their geodynamic settings.Miner Depos,48:267-294
Martin R F.2007.Amphiboles in the igneous environment.Rev Mineral Geochem,67:323-358
Middlemost E A K.1994.Naming materials in the magma/igneous rock system.Earth-Sci Rev,37:215-224
Miller C F,McDowell S M,Mapes R W.2003.Hot and cold granites?Implications of zircon saturation temperatures and preservation of inheritance.Geology,31:529-532
Pearce J A,Harris N B W,Tindle A G.1984.Trace element discrimination diagrams for the tectonic interpretation of granitic rocks.J Petrol,25:956-983
Sial A N,Ferreira V P,Fallick A E,Cruz M J M.1998.Amphibole-rich clots in calc-alkalic granitoids in the Borborema province,northeastern Brazil.J South Am Earth Sci,11:457-471
Stephens W E.2001.Polycrystalline amphibole aggregates(clots)in granites as potential I-type restite:An ion microprobe study of rareearth distributions.Aust J Earth Sci,48:591-601
Sun S S,Mcdonough W F.1989.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes.In:Saunders A D,Norry M J,eds.Magmatism in the Ocean Basins.Geol Soc Lond Spec Publ,42:313-345
Thompson A B.1982.Dehydration melting of pelitic rocks and the generation of H2O-undersaturated granitic liquids.Am J Sci,282:1567-1595
Vielzeuf D,Montel J M.1994.Partial melting of metagreywackes.Part I.Fluid-absent experiments and phase relationships.Contrib Mineral Petrol,117:375-393
Wang Y J,Fan W M,Guo F.2003a.Geochemistry of early Mesozoic potassium-rich diorites-granodiorites in southeastern Hunan Province,South China:Petrogenesis and tectonic implications.Geochem J,37:427-448
Wang Y J,Fan W M,Guo F,Peng T P,Li C W.2003b.Geochemistry of Mesozoic mafic rocks adjacent to the Chenzhou-Linwu fault,south China:Implications for the lithospheric boundary between the Yangtze and Cathaysia Blocks.Int Geol Rev,45:263-286
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