安徽铜陵沙滩脚岩体年代学及地球化学特征
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摘要
沙滩脚岩体位于铜陵矿集区东南部,主体为花岗闪长岩,锆石LA-ICP-MS U-Pb同位素测年结果表明,岩石侵位时代为141.4 Ma±1.1 Ma,属早白垩世,与铜陵地区其它岩体形成年代范围一致。沙滩脚花岗闪长岩的w(SiO2)在62.06%~65.53%之间、w(Al2O3)为16.05%~17.06%,Na2O/K2O比值均大于1(1.24~2.34),其属于高钾钙碱性系列。岩石稀土元素含量高,富集轻稀土和大离子亲石元素,亏损高场强元素,同时具有高Sr、低Y从而高Sr/Y比值(47.43~137.50)的特征,类似埃达克质岩石,暗示其岩浆形成于较高的压力下,为加厚的下地壳部分熔融的产物。
The precise zircon LA-ICP-MS U-Pb dating of Shatanjiao granodiorite in the southeast Tongling area gives a mean age of 141.4 Ma±1.1 Ma,belonging to early Cretaceous and having the same e ages of other plutons in Tongling area.Analysis of major and trace elements of Shatanjiao granodiorite shows that it belongs to high-K calc-alkaline series characterized by high SiO2(62.06%~65.53%) and Al2O3(16.05%~17.06%) contents,enriched in LREE and LILE,depleted in high field strength elements such as Ta and Nb as well as high Sr,low Y and high Sr/Y ratios(47.43~137.50).These features are similar to those of adakitic magmas and imply that the Shatanjiao granodiorite was derived from partial melting of thickened lower crust under the condition of higher pressure.
The precise zircon LA-ICP-MS U-Pb dating of Shatanjiao granodiorite in the southeast Tongling area gives a mean age of 141.4 Ma±1.1 Ma,belonging to early Cretaceous and having the same e ages of other plutons in Tongling area.Analysis of major and trace elements of Shatanjiao granodiorite shows that it belongs to high-K calc-alkaline series characterized by high SiO2(62.06%~65.53%) and Al2O3(16.05%~17.06%) contents,enriched in LREE and LILE,depleted in high field strength elements such as Ta and Nb as well as high Sr,low Y and high Sr/Y ratios(47.43~137.50).These features are similar to those of adakitic magmas and imply that the Shatanjiao granodiorite was derived from partial melting of thickened lower crust under the condition of higher pressure.
引文
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[6]任云生,刘连登,万相宗,等.狮子山矿田矽卡岩型金矿铋矿物与金矿化关系研究[J].矿物岩石,2004,24(2):41-45.
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[12]李献华,刘颖,涂湘林,等.硅酸盐岩石化学组成的ICP-AES和ICP-MS准确测定:酸溶与碱溶分解样品方法的对比[J].地球化学,2002,31(3):289-294.
[13]刘晔,柳小明.胡兆初,等.ICP-MS测定地质样品中37个元素的准确度和长期稳定性分析[J].岩石学报,2007,23(05):1 203-1 210.
[14]Hoskin P W O,Black L P.Metamorphic zircon formation by solid-state recrystallization of protolith igneous zircon[J].Metamorph Geol,2000,18:423-439.
[15]王强,赵振华,熊小林,等.底侵玄武质下地壳的熔融:来自安徽沙溪adakite质富钠石英闪长玢岩的证据[J].地球化学,2007,30(4):353-361.
[16]王强,赵振华,许继峰,等.扬子地块东部燕山期埃达克质(adakite-like)岩与成矿[J].中国科学,2002,32(增刊):127-136.
[17]Defant M J,Drumond M S.Derivation of modem arc magmas by melting of young subducted lithosphere[J].Nature,1990,347:662-665.
[18]Atherton M P,Petford N.Generation of sodium-rich magmas from newly underplated basaltic crost[J].Nature,1993,362:144-146.
[19]张旗,王焰,钱青,等.中国东部中生代埃达克岩的特征及其构造-成矿意义[J].岩石学报,2001a.17(2):236-244.
[20]王强,赵振华,许继峰,等.鄂东南铜山口、殷祖埃达克质(adakitic)侵入岩的地球化学特征对比:(拆沉)下地壳熔融与斑岩铜矿的成因[J].岩石学报,2004,20(4):351-360.
[21]许继峰,王强,徐义刚,等.宁镇地区中生代安基山中酸性侵人岩的地球化学亏损重稀土和钇的岩浆产生的限制[J].岩石学报,2001,17(4):576-584.
[22]朱弟成,段丽萍,廖忠礼,等.两类埃达克岩(Adakite)的判别[J].矿物岩石,2008,22(3):5-9.
[23]徐晓春,陆三明,谢巧勤,等.安徽铜陵狮子山矿田岩浆岩锆石SHRIMP定年及其成因意义[J].地质学报,2008,82(4):500-509.
[24]王彦斌,刘敦一,曾普胜.铜陵地区小铜官山石英闪长岩锆石SHRIMP的U-Pb年龄及其成因指示[J].岩石矿物学杂志,2004,23(04):298-307.
[25]张达,吴淦国,狄永军,等.铜陵凤凰山岩体SHRIMP锆石U-Pb年龄与构造变形及其对岩体侵位动力学背景的制约[J].地球科学-中国地质大学学报,2006,31(6):823-829.
[26]杨小男,徐兆文,张军,等.安徽狮子山矿田南洪冲岩体形成时代及成因机制研究[J].岩石学报,2007,23(06):1543-1550.
[27]闫峻,刘海泉,宋传中,等.长江中下游繁昌-宁芜火山盆地火山岩锆石U-Pb年代学及其地质意义[J].科学通报,2009,54(12):1716-1724.
[28]邓晋福,吴宗絮.下扬子克拉通岩石圈减薄事件与长江中下游Cu-Fe成矿带[J].安徽地质,2001,11(2):86-91.
[29]Xie G Q,Mao J W,Li R L,et al.Geochemistry and Nd-Sr isotopic studies of Late Mesozoic granitoids in the southeastern Hubei Province,Middle-Lower Yangtze River belt,Eastern China:Petrogenesis and tectonic setting[J].Lithos,2008,104:216?230.
[30]黄顺生,徐兆文,顾连兴,等,安徽铜陵狮子山矿田岩浆岩地球化学特征及成因机制[J].高校地质学报,2006,10(2):217-226.
[31]王元龙,王焰,张旗,等.铜陵地区中生代中酸性侵入岩的地球化学特征及其成矿地球动力学意义[J].岩石学报,2004,20(2):325-338.
[32]Wang Q,Derek A W,Xu J F,et al.Petrogenesis of Cretaceous adakitic and shoshonitic igneous rocks in the Luzong area,Anhui Province(eastern China):Implications for geodynamics and Cu-Au mineralization[J].Lithos,2006,89:424-446.
[33]Middlemost,E A K.Naming materials in magma/igneous rock system[J].Earth SC Rev,1994,37(2):15-224.
[34]Le Mait re R W,Bateman P,Dudek A,et al.A Classification of Igneous Rocks and Glossary of Terms[M].Oxford:Blackwell Scientific Pub-lications,1989.
[35]Maniar P D and Piccoli P M.Tectonic discrimination of granitoids[J].Geological Society of America Bulletin,1989,101:635-643.
[36]Boynton W V.Geochemistry of the rare earth elements:Meteorite studies[M].Rare Earth Elements Geochemstry.Elsevier,1984:63-114.
[37]Sun S S,McDonough W F.Chemical and isotopic systemmatics of oceanic basalts:implication for the mantle composition and process[M].Geological society of London and Blackwell Scientific Publications,1989:313-345.
[38]Defant M J,Drummond M S.Derivation of some modern arc magma by the partial melting of young subduction lithosphere[J].Nature,1990,347:662-665.
①安徽省地质局三一七地质队.铜陵幅1∶20×104地质图,1969.
②安徽省地质局三二一地质队.戴家汇幅1∶5×104地质图,1985.
[2]唐永成,吴言昌,储国正,等.安徽沿江地区铜多金属矿床地质[M].北京:地质出版社,1998.
[3]谢建成,杨晓勇,Insung Lee.安徽沿江地区燕山期含铜岩体稀土、微量地球化学特征[J].矿物岩石,2008,28(1):72-78.
[4]杜杨松,李顺庭,曹毅,等.安徽铜陵铜官山矿区中生代侵入岩的形成过程-岩浆底侵、同化混染和分离结晶[J].现代地质,2007,21(3):71-77.
[5]瞿泓滢,裴荣富,李进文,等.安徽铜陵凤凰山燕山期中酸性侵入岩地球化学特征及其与金属成矿关系[J].中国地质,2010,37(2):311-322.
[6]任云生,刘连登,万相宗,等.狮子山矿田矽卡岩型金矿铋矿物与金矿化关系研究[J].矿物岩石,2004,24(2):41-45.
[7]蒋其胜,韩长生,黄建满.姚家岭铜铅锌矿床地质背景及成因探讨[J].安徽地质,2005,14(4):265-269.
[8]Jackson S E,Pearson N J,Griffin W L,et al.The application of laser ablation-inductively coupled plasma-mass spectrometer(LA-ICP-MS)to in situ U-Pb zircon geochronology[J].Chem Geol,2004,211:47-69.
[9]Black L P,Gulson B L.The age of the Mud Tank carbonatite,Strangways Range,Northern Territory[J].BMR J Aust Geol Geophys,1978,3:227-232.
[10]Anderson.Correction of common lead in U-Pb analyses that do not report204Pb[J].Chem Geol,2002,192:59-79.
[11]Ludwig K R.Isoplot/Ex version2.3-A geochronological toolkit for Microsoft Excel[M].Berkeley:Berkeley Geochronology Center,SpecialPublication No.1a,2000.
[12]李献华,刘颖,涂湘林,等.硅酸盐岩石化学组成的ICP-AES和ICP-MS准确测定:酸溶与碱溶分解样品方法的对比[J].地球化学,2002,31(3):289-294.
[13]刘晔,柳小明.胡兆初,等.ICP-MS测定地质样品中37个元素的准确度和长期稳定性分析[J].岩石学报,2007,23(05):1 203-1 210.
[14]Hoskin P W O,Black L P.Metamorphic zircon formation by solid-state recrystallization of protolith igneous zircon[J].Metamorph Geol,2000,18:423-439.
[15]王强,赵振华,熊小林,等.底侵玄武质下地壳的熔融:来自安徽沙溪adakite质富钠石英闪长玢岩的证据[J].地球化学,2007,30(4):353-361.
[16]王强,赵振华,许继峰,等.扬子地块东部燕山期埃达克质(adakite-like)岩与成矿[J].中国科学,2002,32(增刊):127-136.
[17]Defant M J,Drumond M S.Derivation of modem arc magmas by melting of young subducted lithosphere[J].Nature,1990,347:662-665.
[18]Atherton M P,Petford N.Generation of sodium-rich magmas from newly underplated basaltic crost[J].Nature,1993,362:144-146.
[19]张旗,王焰,钱青,等.中国东部中生代埃达克岩的特征及其构造-成矿意义[J].岩石学报,2001a.17(2):236-244.
[20]王强,赵振华,许继峰,等.鄂东南铜山口、殷祖埃达克质(adakitic)侵入岩的地球化学特征对比:(拆沉)下地壳熔融与斑岩铜矿的成因[J].岩石学报,2004,20(4):351-360.
[21]许继峰,王强,徐义刚,等.宁镇地区中生代安基山中酸性侵人岩的地球化学亏损重稀土和钇的岩浆产生的限制[J].岩石学报,2001,17(4):576-584.
[22]朱弟成,段丽萍,廖忠礼,等.两类埃达克岩(Adakite)的判别[J].矿物岩石,2008,22(3):5-9.
[23]徐晓春,陆三明,谢巧勤,等.安徽铜陵狮子山矿田岩浆岩锆石SHRIMP定年及其成因意义[J].地质学报,2008,82(4):500-509.
[24]王彦斌,刘敦一,曾普胜.铜陵地区小铜官山石英闪长岩锆石SHRIMP的U-Pb年龄及其成因指示[J].岩石矿物学杂志,2004,23(04):298-307.
[25]张达,吴淦国,狄永军,等.铜陵凤凰山岩体SHRIMP锆石U-Pb年龄与构造变形及其对岩体侵位动力学背景的制约[J].地球科学-中国地质大学学报,2006,31(6):823-829.
[26]杨小男,徐兆文,张军,等.安徽狮子山矿田南洪冲岩体形成时代及成因机制研究[J].岩石学报,2007,23(06):1543-1550.
[27]闫峻,刘海泉,宋传中,等.长江中下游繁昌-宁芜火山盆地火山岩锆石U-Pb年代学及其地质意义[J].科学通报,2009,54(12):1716-1724.
[28]邓晋福,吴宗絮.下扬子克拉通岩石圈减薄事件与长江中下游Cu-Fe成矿带[J].安徽地质,2001,11(2):86-91.
[29]Xie G Q,Mao J W,Li R L,et al.Geochemistry and Nd-Sr isotopic studies of Late Mesozoic granitoids in the southeastern Hubei Province,Middle-Lower Yangtze River belt,Eastern China:Petrogenesis and tectonic setting[J].Lithos,2008,104:216?230.
[30]黄顺生,徐兆文,顾连兴,等,安徽铜陵狮子山矿田岩浆岩地球化学特征及成因机制[J].高校地质学报,2006,10(2):217-226.
[31]王元龙,王焰,张旗,等.铜陵地区中生代中酸性侵入岩的地球化学特征及其成矿地球动力学意义[J].岩石学报,2004,20(2):325-338.
[32]Wang Q,Derek A W,Xu J F,et al.Petrogenesis of Cretaceous adakitic and shoshonitic igneous rocks in the Luzong area,Anhui Province(eastern China):Implications for geodynamics and Cu-Au mineralization[J].Lithos,2006,89:424-446.
[33]Middlemost,E A K.Naming materials in magma/igneous rock system[J].Earth SC Rev,1994,37(2):15-224.
[34]Le Mait re R W,Bateman P,Dudek A,et al.A Classification of Igneous Rocks and Glossary of Terms[M].Oxford:Blackwell Scientific Pub-lications,1989.
[35]Maniar P D and Piccoli P M.Tectonic discrimination of granitoids[J].Geological Society of America Bulletin,1989,101:635-643.
[36]Boynton W V.Geochemistry of the rare earth elements:Meteorite studies[M].Rare Earth Elements Geochemstry.Elsevier,1984:63-114.
[37]Sun S S,McDonough W F.Chemical and isotopic systemmatics of oceanic basalts:implication for the mantle composition and process[M].Geological society of London and Blackwell Scientific Publications,1989:313-345.
[38]Defant M J,Drummond M S.Derivation of some modern arc magma by the partial melting of young subduction lithosphere[J].Nature,1990,347:662-665.
①安徽省地质局三一七地质队.铜陵幅1∶20×104地质图,1969.
②安徽省地质局三二一地质队.戴家汇幅1∶5×104地质图,1985.
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