广西佛子冲铅锌矿田火成岩的时空序列及其对成矿时限的约束
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摘要
广西佛子冲铅锌矿田火成岩的主要岩石类型有花岗岩、花岗斑岩、花岗闪长岩(石英闪长岩)、花岗闪长斑岩、少斑花岗斑岩、英安斑岩和凝灰岩等。本文共进行了14件火成岩样品的LA-ICP-MS锆石UPb测年,其中大冲石英闪长岩侵位于海西期二叠纪((256.8±2.0)Ma),糯垌岩体((152.6±1.2)Ma)和广平岩体((152.9±2.9)Ma)形成于燕山早期晚侏罗世,花岗斑岩、少斑花岗斑岩、花岗闪长斑岩、英安斑岩和火山角砾凝灰岩形成于燕山晚期早白垩世(约100Ma)。结合前人的研究成果及14件火成岩样品的测年结果,构建该区火成岩的年代学序列,确定其侵位时代主要集中在志留纪(约440Ma)、二叠纪末期(约256Ma)、晚侏罗世(约152Ma)、早白垩世晚期(约100Ma)。根据佛子冲铅锌矿的空间展布、矿体特征以及与火成岩的关系,确定花岗斑岩为成矿地质体,进而限定其成矿时代为早白垩世晚期(约100Ma)。
The main rock types of igneous rocks in Fozichong ore field are granite,granite porphyry,granodiorite(quartz diorite),granodiorite porphyry,dacite porphyry and tuff.We measured the ages of14 igneous rock samples in this area by LA-ICP-MS zircon U-Pb dating.The Dachong quartz diorite was formed in Permian((256.8±2.0)Ma);Nuodong Pluton((152.6±1.2)Ma)and Guangping Pluton((152.9±2.9)Ma)were formed in the Late Jurassic of Yanshanian;granite porphyry,granite diorite porphyry,less spot granite porphyry,granite diorite porphyry,dacite porphyry and tuff were formed in the Early Cretaceous of Yanshanian(100 Ma±).The ages of the igneous rocks in Fozichong ore field are mainly concentrated in Silurian(440 Ma±),Late Permian(256 Ma±),Late Jurassic(152 Ma±),and late Early Cretaceous(100 Ma±).According to the spatial distribution,ore body characteristics and the relationship with igneous rocks,the granite porphyry is considered to be the metallogenic geological body,and the metallogenic age is defined as the late Early Cretaceous(about 100 Ma).
The main rock types of igneous rocks in Fozichong ore field are granite,granite porphyry,granodiorite(quartz diorite),granodiorite porphyry,dacite porphyry and tuff.We measured the ages of14 igneous rock samples in this area by LA-ICP-MS zircon U-Pb dating.The Dachong quartz diorite was formed in Permian((256.8±2.0)Ma);Nuodong Pluton((152.6±1.2)Ma)and Guangping Pluton((152.9±2.9)Ma)were formed in the Late Jurassic of Yanshanian;granite porphyry,granite diorite porphyry,less spot granite porphyry,granite diorite porphyry,dacite porphyry and tuff were formed in the Early Cretaceous of Yanshanian(100 Ma±).The ages of the igneous rocks in Fozichong ore field are mainly concentrated in Silurian(440 Ma±),Late Permian(256 Ma±),Late Jurassic(152 Ma±),and late Early Cretaceous(100 Ma±).According to the spatial distribution,ore body characteristics and the relationship with igneous rocks,the granite porphyry is considered to be the metallogenic geological body,and the metallogenic age is defined as the late Early Cretaceous(about 100 Ma).
引文
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[15]雷良奇,宋慈安,冯佐海.佛子冲火山岩区隐伏铅锌矿床的类型归属及成矿远景[J].地质与勘探,2002,38(1):8-14.Lei Liangqi,Song Ci’an,Feng Zuohai.The Types of Hidden Lead-Zinc Deposits and the Exploration Prospect in the Volcanic Cover Terrain of Fozichong Belt,Southeastern Guangxi,China[J].Geology and Prospecting,2002,38(1):8-14.
[16]程顺波,付建明,马丽艳,等.广西佛子冲矿田大冲花岗闪长岩锆石SHRIMP U-Pb定年及其地质意义[J].华南地质与矿产,2012,28(4):315-320.Cheng Shunbo,Fu Jianming,Ma Liyan,et al.Zircon SHRIMP U-Pb Dating of Dachong Granodioritic Stock and Its Geological Significance in Fozichong Deposit,Guangxi Province[J].Geology and Mineral Resources of South China,2012,28(4):315-320.
[17]杨启军,秦亚,王泰山,等.广西佛子冲矿田二长花岗斑岩的年代学、地球化学特征及其意义[J].吉林大学学报(地球科学版),2017,47(3):760-774.Yang Qijun,Qin Ya,Wang Taishan,et al.Chronology and Geochemical Characteristics of Monzogranitic Porphyry from Fozichong Ore Field in Guangxi Province and Their Geological Implication[J].Journal of Jilin University(Earth Science Edtion),2017,47(3):760-774.
[18]广西壮族自治区地质矿产局.广西壮族自治区区域地质志[M].北京:地质出版社,1985:1-853.Bureau of Geology and Mineral Resources of Guangxi Zhuang Autonomous Region.Regional Geology of Guangxi Zhuang Autonomous Region[M].Beijing:Geological Publishing House,1985:1-853.
[19]张伯友,赵振华,石满全,等.岑溪二叠纪岛弧型玄武岩的首次厘定及大地构造意义:两广交界古特提斯构造带的重要证据[J].科学通报,1997,42(4):413-416.Zhang Boyou,Zhao Zhenhua,Shi Manquan,et al.First Discovery of Permisn Island-Arc Basalts in Cenxi:Important Evidence of the Palco-Tethyan Orogenic Belt on the Guangdong-Guangxi Border Region,South China[J].Chinese Science Bulletin,1997,42(4):413-416.
[20]彭松柏,刘松峰,林木森,等.华夏古生代俯冲作用:Ⅰ:来自糯垌蛇绿岩的新证据[J].地球科学,2016,41(5):765-778.Peng Songbai,Liu Songfeng,Lin Musen,et al.Early Paleozoic Subduction in Cathaysia:Ⅰ:New Evidence from Nuodong Ophiolite[J].Earth Science,2016,41(5):765-778.
[21]彭松柏,刘松峰,林木森,等.华夏古生代俯冲作用:Ⅱ:大爽高镁-镁质安山岩新证据[J].地球科学,2016,41(6):931-947.Peng Songbai,Liu Songfeng,Lin Musen,et al.Early Paleozoic Subduction in Cathaysia:Ⅱ:New Evidence from the Dashuang High Magnesian-Magnesian Andesite[J].Earth Science,2016,41(6):931-947.
[22]覃小锋,王宗起,宫江华,等.云开地块北缘加里东期中-基性火山岩的厘定:钦-杭结合带南西段早古生代古洋盆存在的证据[J].岩石学报,2017,33(3):791-809.Qin Xiaofeng,Wang Zongqi,Gong Jianghua,et al.The Confirmation of Caledonian Intermediate-Mafic Volcanic Rocks in Northern Margin of Yunkai Block:Evidence for Early Paleozoic Paleo-Ocean Basin in Southweatern Segment of Qinzhou-Hangzhou Joint Belt[J].Acta Petrologica Sinica,2017,33(3):791-809.
[23]Liu Yongsheng,Gao Shan,Hu Zhaochu,et al.Continental and Oceanic Crust Recycling-Induced Melt-Peridotite Interactions in the Trans-North China Orogen:U-Pb Dating,Hf Isotopes and Trace Elements in Zircons from Mantle Xenoliths[J].Journal of Petrology,2010,51(1):537-571.
[2]杨斌,刘兴德,刘建明.广西佛子冲铅锌矿田两种矿石类型及其成因意义[J].桂林工学院学报,2002,22(2):109-113.Yang Bin,Liu Xingde,Liu Jianming.Two Kinds of Ore and Their Genesis in Fozichong Lead-Zinc Orefield,Guangxi[J].Journal of Guilin Institute of Technology,2002,22(2):109-113.
[3]徐海.广西佛子冲地区成矿模式与找矿模式研究[J].有色金属矿产与勘查,1995,4(6):341-345.Xu Hai.A Study on Metallogenetic Model and Prospecting Model for Pb-Zn Deposit in the Fozichong Area,Guangxi Zhuang Autonomous Region[J].Geological Exploration for Non-Ferrous Metals,1995,4(6):341-345.
[4]徐海.广西佛子冲铅锌矿田地质特征及找矿前景[J].广西地质,1996,9(4):43-52.Xu Hai.Geological Characteristics and Exploration Prospects for Fozichong Pb-Zn Ore Field,Guangxi[J].Guangxi Geology,1996,9(4):43-52.
[5]潘烨,刘炜,江河,等.广西佛子冲铅锌矿床地质地球化学特征[J].华南地质与矿产,2012,28(2):160-167.Pan Ye,Liu Wei,Jiang He,et al.Geological and Geochemical Characteristics of Fozichong Lead-Zinc Ore Field,Guangxi Province[J].Geology and Mineral Resources of South China,2012,28(2):160-167.
[6]蔡锦辉,韦昌山,王猛,等.广西佛子冲铅锌矿田地质特征及找矿模式[J].华南地质与矿产,2007,23(3):12-18.Cai Jinhui,Wei Changshan,Wang Meng,et al.The Geological Characteristics and Prospecting Mode of the Fozichong Pb-Zn Ore Field,Guangxi[J].Geology and Mineral Resources of South China,2007,23(3):12-18.
[7]熊险峰.广西佛子冲铅锌矿床地球化学特征[D].荆州:长江大学,2013.Xiong Xianfeng.The Geochemical Characteristics of Fozichong Pb-Zn Ore Field,Guangxi[D].Jingzhou:Yangtze University,2013.
[8]王猛.广西佛子冲铅锌矿床的控矿条件研究[D].北京:中国地质科学院,2007.Wang Meng.Research on Ore Controlling Conditions in Fozichong Pb-Zn Ore Field,Guangxi[D].Beijing:Chinese Academy of Geological Sciences,2007.
[9]李玉平,陈世益,彭柏兴.广西佛子冲铅锌矿田含矿围岩稀土元素地球化学特征与矿床成因探讨[J].广西地质,1993,6(1):53-61.Li Yuping,Chen Shiyi,Peng Baixing.On the Features of REE Geochemistry of Ore-Bearing Country Rocks and the Genesis of Fozichong Pb-Zn Ore Field,Guangxi[J].Guangxi Geology,1993,6(1):53-61.
[10]吴烈善,彭省临,覃宗光,等.广西佛子冲铅锌矿田喷流沉积岩地球化学特征[J].矿物岩石地球化学通报,2004,23(4):26-31.Wu Lieshan,Peng Shenglin,Qin Zongguang,et al.Geochemical Characteristics of Spout-Sedimentary Rock of the Fozichong Lead-Zinc Ore Field in Guangxi[J].Bulletin of Mineralogy,Petrology and Geochemistry,2004,23(4):26-31.
[11]杨斌,骆良羽,罗世金.广西佛子冲铅锌矿田成因刍议[J].广西地质,2000,13(1):21-27.Yang Bin,Luo Liangyu,Luo Shijin.Discussion on the Genesis of Fozichong Lead-Zinc Ore Field[J].Guangxi Geology,2000,13(1):21-27.
[12]翟丽娜,王建辉,韦昌山,等.广西佛子冲铅锌矿田成岩成矿时代研究[J].华南地质与矿产,2008,24(3):46-49.Zhai Lina,Wang Jianhui,Wei Changshan,et al.Reaearching on the Age of Rock-Forming and Metallogenic Epoch of Focichong Ore Field in Guangxi[J].Geology and Mineral Resources of South China,2008,24(3):46-49.
[13]雷良奇.广西佛子冲铅锌(银)矿田岩浆岩的时代及地球化学特征[J].岩石学报,1995,11(1):77-82.Lei Liangqi.Age and Geochemical Character of Magmatites in Fozichong Pb-Zn(Ag)Ore Field,Guangxi,China[J].Acta Petrologica Sinica,1995,11(1):77-82.
[14]雷良奇,宋慈安,冯佐海.广西佛子冲铅锌(银)成矿带多元素富集特征及矿床成因[J].矿床地质,2002,21(1):74-82.Lei Liangqi,Song Ci’an,Feng Zuohai.Discussion on Multi-Element Enrichment Characteristics and Genesis of Fozichong Pb-Zn(Ag)Metallogenic Belt,Guangxi[J].Mineral Deposits,2002,21(1):74-82.
[15]雷良奇,宋慈安,冯佐海.佛子冲火山岩区隐伏铅锌矿床的类型归属及成矿远景[J].地质与勘探,2002,38(1):8-14.Lei Liangqi,Song Ci’an,Feng Zuohai.The Types of Hidden Lead-Zinc Deposits and the Exploration Prospect in the Volcanic Cover Terrain of Fozichong Belt,Southeastern Guangxi,China[J].Geology and Prospecting,2002,38(1):8-14.
[16]程顺波,付建明,马丽艳,等.广西佛子冲矿田大冲花岗闪长岩锆石SHRIMP U-Pb定年及其地质意义[J].华南地质与矿产,2012,28(4):315-320.Cheng Shunbo,Fu Jianming,Ma Liyan,et al.Zircon SHRIMP U-Pb Dating of Dachong Granodioritic Stock and Its Geological Significance in Fozichong Deposit,Guangxi Province[J].Geology and Mineral Resources of South China,2012,28(4):315-320.
[17]杨启军,秦亚,王泰山,等.广西佛子冲矿田二长花岗斑岩的年代学、地球化学特征及其意义[J].吉林大学学报(地球科学版),2017,47(3):760-774.Yang Qijun,Qin Ya,Wang Taishan,et al.Chronology and Geochemical Characteristics of Monzogranitic Porphyry from Fozichong Ore Field in Guangxi Province and Their Geological Implication[J].Journal of Jilin University(Earth Science Edtion),2017,47(3):760-774.
[18]广西壮族自治区地质矿产局.广西壮族自治区区域地质志[M].北京:地质出版社,1985:1-853.Bureau of Geology and Mineral Resources of Guangxi Zhuang Autonomous Region.Regional Geology of Guangxi Zhuang Autonomous Region[M].Beijing:Geological Publishing House,1985:1-853.
[19]张伯友,赵振华,石满全,等.岑溪二叠纪岛弧型玄武岩的首次厘定及大地构造意义:两广交界古特提斯构造带的重要证据[J].科学通报,1997,42(4):413-416.Zhang Boyou,Zhao Zhenhua,Shi Manquan,et al.First Discovery of Permisn Island-Arc Basalts in Cenxi:Important Evidence of the Palco-Tethyan Orogenic Belt on the Guangdong-Guangxi Border Region,South China[J].Chinese Science Bulletin,1997,42(4):413-416.
[20]彭松柏,刘松峰,林木森,等.华夏古生代俯冲作用:Ⅰ:来自糯垌蛇绿岩的新证据[J].地球科学,2016,41(5):765-778.Peng Songbai,Liu Songfeng,Lin Musen,et al.Early Paleozoic Subduction in Cathaysia:Ⅰ:New Evidence from Nuodong Ophiolite[J].Earth Science,2016,41(5):765-778.
[21]彭松柏,刘松峰,林木森,等.华夏古生代俯冲作用:Ⅱ:大爽高镁-镁质安山岩新证据[J].地球科学,2016,41(6):931-947.Peng Songbai,Liu Songfeng,Lin Musen,et al.Early Paleozoic Subduction in Cathaysia:Ⅱ:New Evidence from the Dashuang High Magnesian-Magnesian Andesite[J].Earth Science,2016,41(6):931-947.
[22]覃小锋,王宗起,宫江华,等.云开地块北缘加里东期中-基性火山岩的厘定:钦-杭结合带南西段早古生代古洋盆存在的证据[J].岩石学报,2017,33(3):791-809.Qin Xiaofeng,Wang Zongqi,Gong Jianghua,et al.The Confirmation of Caledonian Intermediate-Mafic Volcanic Rocks in Northern Margin of Yunkai Block:Evidence for Early Paleozoic Paleo-Ocean Basin in Southweatern Segment of Qinzhou-Hangzhou Joint Belt[J].Acta Petrologica Sinica,2017,33(3):791-809.
[23]Liu Yongsheng,Gao Shan,Hu Zhaochu,et al.Continental and Oceanic Crust Recycling-Induced Melt-Peridotite Interactions in the Trans-North China Orogen:U-Pb Dating,Hf Isotopes and Trace Elements in Zircons from Mantle Xenoliths[J].Journal of Petrology,2010,51(1):537-571.
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