安徽宁国兰花岭钨钼矿床含矿岩体的地球化学特征、LA-ICP-MS锆石U-Pb年代学研究
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摘要
兰花岭钨钼矿床为皖南山区一矽卡岩型矿床,赋矿层位主要为奥陶系印诸埠组和砚瓦山组。与成矿相关的兰花岭岩体属花岗岩,为高钾钙碱性系列岩石,Si O2含量高,Al2O3中等,Mg O较高。全碱(Na2O+K2O)含量在4.00%~7.03%之间,里特曼指数为0.51~1.92,A/NCK比值均大于1,Nb、Ta亏损,Mg#值小。稀土元素呈轻稀土富集的右倾配分模型,LREE/HREE比值和(La/Yb)N均较大,δEu异常不明显,δCe负异常较弱。微量元素地球化学研究表明大离子亲石元素(LILE)富集,高场强元素(HFSE)总体亏损。通过LA-ICP-MS锆石U-Pb法确定地表含矿岩体的年龄为148.17±0.94 Ma,属燕山期晚侏罗世。这一时期也是皖南–赣北一系列大型超大型钨矿的主要成矿期,如东源、朱溪、阳储岭、大湖塘等。岩体成因以壳源重熔为主,侵位过程中有幔源岩浆混入。兰花岭岩体为陆内挤压加厚背景下岩浆活动的产物,与旌德岩体属同期次岩浆活动的产物,结合物探资料显示兰花岭岩体在深部可能与旌德岩体相连。
The Lanhualing tungsten-molybdenum deposit is a skarn-type deposit located in Ningguo county, Anhui province. This deposit is mainly hosted in the Yinzhubu Formation and the Yanwashan Formation of Ordovician, and genetically related to the Lanhualing granite. The Lanhualing granite belongs to high-K calc-alkaline series with high alkali(Na2O+K2O=4.00%–7.03%), Si O2(67.87%–74.92%) and Mg O(0.62%–1.23%) contents. The granitic rocks show right-dipping chondrite normalized REE patterns with weak δEu anomalies. The granitic rocks are relatively enriched in large ion lithophile elements(LILE) and depleted in high field strength elements(HFSE). The ore-bearing granite was dated at 148.17±0.94 Ma by LA-ICP-MS zircon U-Pb method. The late Yanshanian is the main tungsten mineralization epoch in the South Anhui-north Jiangxi area; and indeed, the Dongyuan, Zhuxi, Yangchuling, Dahutang and other large and super-large tungsten deposits were formed in this period. Geochemical Characteristics of the Lanhualing granite indicate a crustal source but with mantle input under tectonic regime of compression thickening.
The Lanhualing tungsten-molybdenum deposit is a skarn-type deposit located in Ningguo county, Anhui province. This deposit is mainly hosted in the Yinzhubu Formation and the Yanwashan Formation of Ordovician, and genetically related to the Lanhualing granite. The Lanhualing granite belongs to high-K calc-alkaline series with high alkali(Na2O+K2O=4.00%–7.03%), Si O2(67.87%–74.92%) and Mg O(0.62%–1.23%) contents. The granitic rocks show right-dipping chondrite normalized REE patterns with weak δEu anomalies. The granitic rocks are relatively enriched in large ion lithophile elements(LILE) and depleted in high field strength elements(HFSE). The ore-bearing granite was dated at 148.17±0.94 Ma by LA-ICP-MS zircon U-Pb method. The late Yanshanian is the main tungsten mineralization epoch in the South Anhui-north Jiangxi area; and indeed, the Dongyuan, Zhuxi, Yangchuling, Dahutang and other large and super-large tungsten deposits were formed in this period. Geochemical Characteristics of the Lanhualing granite indicate a crustal source but with mantle input under tectonic regime of compression thickening.
引文
安徽省地质调查院.2009.安徽省宁国市兰花岭地区钨钼矿普查地质报告.
陈芳,杜建国,许卫.2013a.安徽青阳百丈岩钨钼矿床成矿背景与成矿模式.地质论评,59(3):437–445.
陈芳,王登红,杜建国,许卫,胡海风,余有林,汤金来.2013b.安徽绩溪伏岭花岗岩LA-ICP-MS锆石U-Pb年龄的精确测定及其地质意义.岩矿测试,32(6):970–977.
丁宁.2012.安徽省钨矿成矿规律.合肥:合肥工业大学硕士学位论文:31–40.
杜建国,戴圣潜,莫宣学,邓晋福,许卫.2003.安徽沿江地区燕山期火成岩成岩成矿地质背景.地学前缘,10(4):551–560.
侯可军,李延河,田有荣.2009.LA-MC-ICP-MS锆石微区原位U-Pb定年技术.矿床地质,28(4):481–492.
柳小明,高山,第五春荣,袁洪林,胡兆初.2007.单颗粒锆石的20μm小斑束原位微区LA-ICP-MS U-Pb年龄和微量元素的同时测定.科学通报,52(2):228–235.
钱辉,夏军.2010.皖南宁国-旌德一带花岗岩地球化学特征及成因.安徽地质,20(3):183–188.
秦燕,王登红,李延河,王克友,吴礼彬,梅玉萍.2010a.安徽青阳百丈岩钨钼矿床成岩成矿年龄测定及地质意义.地学前缘,17(2):170–177.
秦燕,王登红,吴礼彬,王克友,梅玉萍.2010b.安徽东源钨矿含矿斑岩中的锆石SHRIMP U-Pb年龄及其地质意义.地质学报,84(4):479–484.
宋彪,张玉海,万俞生,简平.2002.锆石SHRIMP样品靶制作、年龄测定及有关现象讨论.地质论评,48(增刊):26–30.
王登红,陈郑辉,陈毓川,唐菊型,李建康,应立娟,王成辉,刘善宝,李立兴,秦燕,李华芹,屈文俊,王彦斌,陈文,张彦.2010.我国重要矿产地成岩成矿年代学研究新数据.地质学报,84(7):1030–1040.
王登红,陈郑辉,黄国成,武国忠,陈芳.2012.华南“南钨北扩”、“东钨西扩”及其找矿方向探讨.大地构造与成矿学,36(3):322–329.
王登红,李华芹,屈文俊,何晗晗,秦燕,刘新星,黄凡,王成辉,李超,陈郑辉,李建康,张长青,王永磊,梅玉萍,应立娟,李立兴,赵芝,赵正,付勇,孙涛,侯可军.2014.全国成岩成矿年代谱系.北京:地质出版社:1–438.
吴元保,郑永飞.2004.锆石成因矿物学研究及其对U-Pb年龄解释的制约.科学通报,49(16):1589–1604.
徐志刚,陈毓川,王登红,陈郑辉,李厚明.2008.中国成矿区带划分方案.北京:地质出版社:133–135.
薛怀民,汪应庚,马芳,汪诚,王德恩,左延龙.2009.皖南太平-黄山复合岩体的SHRIMP年代学:由钙碱性向碱性转变对扬子克拉通东南部中生代岩石圈减薄时间的约束.中国科学(D辑),39(7):979–993.
鄢明才,迟清华.1997.中国东部地壳与岩石的化学组成.北京:科学出版社:35–36.
杨明桂.2015.中国矿产地质志·江西卷(下册).北京:地质出版社(出版中).
袁峰,周涛发,范裕,岳书仓,朱光,侯明金.2005.皖赣相邻区燕山期花岗岩类构造背景及其意义.合肥工业大学学报:自然科学版,28(9):1130–1134.
张俊杰,王光杰,杨晓勇,孙卫东,戴圣潜.2012.皖南旌德花岗闪长岩与暗色包体的成因:地球化学、锆石U-Pb年代学与Hf同位素制约.岩石学报,28(12):4047–4063.
周涛发,袁峰,侯明金,杜建国,范裕,朱光,岳书仓.2004.江南隆起带东段皖赣相邻区燕山期花岗岩类的成因及形成的地球动力学背景.矿物岩石,24(3):65–71.
周翔,余心起,王德恩,张德会,李春麟,傅建真,董会明.2011.皖南东源含W、Mo花岗闪长斑岩及成矿年代学研究.现代地质,25(2):201–210.
周翔,余心起,杨赫鸣,王德恩,杜玉雕,柯宏飙.2012.皖南绩溪县靠背尖高Ba-Sr花岗闪长斑岩年代学及其成因.岩石学报,28(10):3403–3417.
Maniar P D,Picoli P M.1992.花岗岩类的构造环境判别.国外地质,(1):12–22.
Belousova E A,Griffin W L,O’Reilly S Y and Pearson N J.2002.Igneous zircon:Trace element composition as anindicator of source rock type.Contributions toMineralogy and Petrology,143:602-622.
Liu Y S,Gao S,Hu Z C,Gao C G,Zong K Q and Wang D B.2010Continental and oceanic crust recycling-inducedmelt-peridotite interactions in the Trans-North China Orogen:U-Pb dating,Hf isotopes and trace elements in zircons frommantle xenoliths.Journal of Petrology,51:537–571.
Liu Y S,Hu Z C,Gao S,Gunther D,Xu J,Gao C and ChenH.2008.In situ analysis of major and trace elements ofanhydrous minerals by LA-ICP-MS without applyingan internal standard.Chemical Geology,257:34–43.
Midddlemost E A K.1985.Magmas and magmatic rocks.London:Longman:1–266.
Middlemost E A K.1994.Naming materials in the magma/igneous rock system.Earth-Science Review,37:215–224.
Rapp R P,Shimizu N,Norman M D and Applegate G S.1999.Reaction between slab-derived melts andperidotite in the mantle wedge:Experimental constraintsat 3.8 GPa.Chemical Geology,160(4):335–356.
Sláma J,Kosler J,Condon D J,Crowley J L,Gerdes A,Hanchar J M,Horstwood M A S,Morris G A,NasdalaL,Norberg N,Schaltegger U,Schoene B,Tubrett M Nand Whitehouse M J.2008.Pleovice zircon a newnatural reference material for U-Pb and Hf isotopicmicro analysis.Chemical Geology,249:1–35.
Song G X,Qin K Z,Li G M,Li X H,Li J X,Liu T B andChang Z S.2012.Zircon SMS U-Pb and molybden iteRe-Os ages of Baizhangyan W-Mo deposit MiddleLower Yangtze Valley:Constraints on tectonic settingof magmatism and mineralization.International GeologyReview,69:853–868.
Sun S S and Mc Donough W F.1989.Chemical and isotopicsystematics of oceanic basalts:Implications for mantlecomposition and process//Sauders A D and Norry M J.Magmatism in the Ocean Basins.Geological Society,London,Special Publication,42:313–345.
陈芳,杜建国,许卫.2013a.安徽青阳百丈岩钨钼矿床成矿背景与成矿模式.地质论评,59(3):437–445.
陈芳,王登红,杜建国,许卫,胡海风,余有林,汤金来.2013b.安徽绩溪伏岭花岗岩LA-ICP-MS锆石U-Pb年龄的精确测定及其地质意义.岩矿测试,32(6):970–977.
丁宁.2012.安徽省钨矿成矿规律.合肥:合肥工业大学硕士学位论文:31–40.
杜建国,戴圣潜,莫宣学,邓晋福,许卫.2003.安徽沿江地区燕山期火成岩成岩成矿地质背景.地学前缘,10(4):551–560.
侯可军,李延河,田有荣.2009.LA-MC-ICP-MS锆石微区原位U-Pb定年技术.矿床地质,28(4):481–492.
柳小明,高山,第五春荣,袁洪林,胡兆初.2007.单颗粒锆石的20μm小斑束原位微区LA-ICP-MS U-Pb年龄和微量元素的同时测定.科学通报,52(2):228–235.
钱辉,夏军.2010.皖南宁国-旌德一带花岗岩地球化学特征及成因.安徽地质,20(3):183–188.
秦燕,王登红,李延河,王克友,吴礼彬,梅玉萍.2010a.安徽青阳百丈岩钨钼矿床成岩成矿年龄测定及地质意义.地学前缘,17(2):170–177.
秦燕,王登红,吴礼彬,王克友,梅玉萍.2010b.安徽东源钨矿含矿斑岩中的锆石SHRIMP U-Pb年龄及其地质意义.地质学报,84(4):479–484.
宋彪,张玉海,万俞生,简平.2002.锆石SHRIMP样品靶制作、年龄测定及有关现象讨论.地质论评,48(增刊):26–30.
王登红,陈郑辉,陈毓川,唐菊型,李建康,应立娟,王成辉,刘善宝,李立兴,秦燕,李华芹,屈文俊,王彦斌,陈文,张彦.2010.我国重要矿产地成岩成矿年代学研究新数据.地质学报,84(7):1030–1040.
王登红,陈郑辉,黄国成,武国忠,陈芳.2012.华南“南钨北扩”、“东钨西扩”及其找矿方向探讨.大地构造与成矿学,36(3):322–329.
王登红,李华芹,屈文俊,何晗晗,秦燕,刘新星,黄凡,王成辉,李超,陈郑辉,李建康,张长青,王永磊,梅玉萍,应立娟,李立兴,赵芝,赵正,付勇,孙涛,侯可军.2014.全国成岩成矿年代谱系.北京:地质出版社:1–438.
吴元保,郑永飞.2004.锆石成因矿物学研究及其对U-Pb年龄解释的制约.科学通报,49(16):1589–1604.
徐志刚,陈毓川,王登红,陈郑辉,李厚明.2008.中国成矿区带划分方案.北京:地质出版社:133–135.
薛怀民,汪应庚,马芳,汪诚,王德恩,左延龙.2009.皖南太平-黄山复合岩体的SHRIMP年代学:由钙碱性向碱性转变对扬子克拉通东南部中生代岩石圈减薄时间的约束.中国科学(D辑),39(7):979–993.
鄢明才,迟清华.1997.中国东部地壳与岩石的化学组成.北京:科学出版社:35–36.
杨明桂.2015.中国矿产地质志·江西卷(下册).北京:地质出版社(出版中).
袁峰,周涛发,范裕,岳书仓,朱光,侯明金.2005.皖赣相邻区燕山期花岗岩类构造背景及其意义.合肥工业大学学报:自然科学版,28(9):1130–1134.
张俊杰,王光杰,杨晓勇,孙卫东,戴圣潜.2012.皖南旌德花岗闪长岩与暗色包体的成因:地球化学、锆石U-Pb年代学与Hf同位素制约.岩石学报,28(12):4047–4063.
周涛发,袁峰,侯明金,杜建国,范裕,朱光,岳书仓.2004.江南隆起带东段皖赣相邻区燕山期花岗岩类的成因及形成的地球动力学背景.矿物岩石,24(3):65–71.
周翔,余心起,王德恩,张德会,李春麟,傅建真,董会明.2011.皖南东源含W、Mo花岗闪长斑岩及成矿年代学研究.现代地质,25(2):201–210.
周翔,余心起,杨赫鸣,王德恩,杜玉雕,柯宏飙.2012.皖南绩溪县靠背尖高Ba-Sr花岗闪长斑岩年代学及其成因.岩石学报,28(10):3403–3417.
Maniar P D,Picoli P M.1992.花岗岩类的构造环境判别.国外地质,(1):12–22.
Belousova E A,Griffin W L,O’Reilly S Y and Pearson N J.2002.Igneous zircon:Trace element composition as anindicator of source rock type.Contributions toMineralogy and Petrology,143:602-622.
Liu Y S,Gao S,Hu Z C,Gao C G,Zong K Q and Wang D B.2010Continental and oceanic crust recycling-inducedmelt-peridotite interactions in the Trans-North China Orogen:U-Pb dating,Hf isotopes and trace elements in zircons frommantle xenoliths.Journal of Petrology,51:537–571.
Liu Y S,Hu Z C,Gao S,Gunther D,Xu J,Gao C and ChenH.2008.In situ analysis of major and trace elements ofanhydrous minerals by LA-ICP-MS without applyingan internal standard.Chemical Geology,257:34–43.
Midddlemost E A K.1985.Magmas and magmatic rocks.London:Longman:1–266.
Middlemost E A K.1994.Naming materials in the magma/igneous rock system.Earth-Science Review,37:215–224.
Rapp R P,Shimizu N,Norman M D and Applegate G S.1999.Reaction between slab-derived melts andperidotite in the mantle wedge:Experimental constraintsat 3.8 GPa.Chemical Geology,160(4):335–356.
Sláma J,Kosler J,Condon D J,Crowley J L,Gerdes A,Hanchar J M,Horstwood M A S,Morris G A,NasdalaL,Norberg N,Schaltegger U,Schoene B,Tubrett M Nand Whitehouse M J.2008.Pleovice zircon a newnatural reference material for U-Pb and Hf isotopicmicro analysis.Chemical Geology,249:1–35.
Song G X,Qin K Z,Li G M,Li X H,Li J X,Liu T B andChang Z S.2012.Zircon SMS U-Pb and molybden iteRe-Os ages of Baizhangyan W-Mo deposit MiddleLower Yangtze Valley:Constraints on tectonic settingof magmatism and mineralization.International GeologyReview,69:853–868.
Sun S S and Mc Donough W F.1989.Chemical and isotopicsystematics of oceanic basalts:Implications for mantlecomposition and process//Sauders A D and Norry M J.Magmatism in the Ocean Basins.Geological Society,London,Special Publication,42:313–345.
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