| 南岭地区钨锡铌钽花岗岩及其成矿作用 |
| |
| 引用本文： | 陈骏,陆建军,陈卫锋,王汝成,马东升,朱金初,张文兰,季峻峰.南岭地区钨锡铌钽花岗岩及其成矿作用[J].高校地质学报,2008,14(4):459-473. |
| |
| 作者姓名： | 陈骏 陆建军 陈卫锋 王汝成 马东升 朱金初 张文兰 季峻峰 |
| |
| 作者单位： | 南京大学 地球科学与工程学院，成矿作用国家重点实验室，南京 210093 |
| |
| 基金项目： | 中国地质调查局地质调查项目
，
国家自然科学基金
|
| |
| 摘 要： | 在晚侏罗世时，南岭地区发生了与花岗岩有关的钨锡铌钽大规模成矿作用。依据花岗岩的岩石学、地球化学及其矿化特征，可将南岭地区含钨锡铌钽花岗岩划分为三个主要类型：含钨花岗岩、含锡钨花岗岩和含钽铌花岗岩。含钨花岗岩的地球化学特征可归纳为铝过饱和，低Ba+Sr 和TiO2，轻重稀土比值低，铕亏损强烈，富Y 和Rb，Rb/Sr 比值高，分异强烈。含锡钨花岗岩总体特征表现为TiO2 含量高，准铝质—弱过铝质，轻重稀土比值和CaO/(K2O+Na2O)比值高，富高场强元素、稀土、Ba+Sr 和Rb，低Rb/Sr 比值，分异演化程度较低。含钽铌花岗岩的地球化学特征主要为TiO2 含量和CaO/(K2O+Na2O)比值低，Al2O3/TiO2 和Rb/Sr 比值明显偏高，强过铝质，贫Ba+Sr、稀土和高场强元素，铕亏损强烈，明显富Rb 和Nb，高度分异演化。三类含矿花岗岩具有明显不同的演化特征，成矿作用与它们的演化密切相关。黑云母花岗岩主要与锡成矿作用有关，二云母花岗岩和白云母花岗岩主要产生钨矿化或锡钨共生矿化，钠长石花岗岩主要与钽铌或锡（钨）钽铌矿化有关。总结了南岭锡钨钽铌矿床的重要类型，提出了绿泥石化花岗岩型锡矿新类型，指出南岭地区要特别注意在含锡钨花岗岩中寻找此类锡矿和云英岩- 石英脉型锡钨矿。
|
| 关 键 词： | 含矿花岗岩 地球化学 花岗岩演化 钨-锡-铌-钽矿床类型 南岭 |
| 修稿时间： | 2008-12-20 |
W-Sn-Nb-Ta-Bearing Granites in the Nanling Range and Their Relationship to Metallogengesis |
| |
| CHEN Jun,LU Jian-Jun,CHEN Wei-Feng,WANG Ru-Cheng,MA Dong-Sheng,ZHU Jin-chu,ZHANG Wen-lan,JI Jun-Feng.W-Sn-Nb-Ta-Bearing Granites in the Nanling Range and Their Relationship to Metallogengesis[J].Geological Journal of China Universities,2008,14(4):459-473. |
| |
| Authors: | CHEN Jun LU Jian-Jun CHEN Wei-Feng WANG Ru-Cheng MA Dong-Sheng ZHU Jin-chu ZHANG Wen-lan JI Jun-Feng |
| |
| Institution: | School of Earth Sciences and Engineering, State Key Laboratory of Mineral Deposits Research,Nanjing University, Nanjing 210093, China |
| |
| Abstract: | The large-scale mineralizations of W, Sn, Nb and Ta related to granites took place in the Late Jurassic period in Nanling Range, South China. According to the petrological and geochemical features of ore-bearing granites and their relationship to mineralizations, they can be grouped into the following three major types: W-bearing granites, Sn-W-bearing granites and Ta-Nb-bearing granites. The W-bearing granites show low TiO2 and Ba Sr contents and LREE/HREE ratios, intensive Eu depletion, high Rb and Y abundances and Rb/Sr ratios, and oversaturation in Al. They commonly underwent intensive differentiation and evolution. The Sn-W-bearing granites are characterized by enrichment of TiO2, total REE, HFSEs, Ba Sr and Rb, higher CaO/(K2O Na2O) and LREE/HREE ratios, metaluminous-weakly peraluminous feature and lower Rb/Sr ratios, and weaker differentiation and evolation. The Ta-Nb-bearing granites have very low TiO2, Ba Sr, total REE and HFSEs contents and CaO/(K2O Na2O) ratios, higher Al2O3/TiO2 and Rb/Sr ratios, higher Rb and Nb contents, and ACNK values. They are highly evolved. Good discrimination can be obtained between these three types of W-Sn-Nb-Ta-bearing granites on plots employing Nb-Y-Ce, (Ba Sr)-Rb-(Zr Nb Ce Y), LREE/HREE-Rb/Sr and LREE/HREE-(Zr Nb Ce Y) diagrams. These three types of ore-bearing granites have obviously different evolutional trends. Metallogenesis is intimately related to the evolution of the ore-bearing granites. Mineralizations of Sn, W or W-Sn and Nb-Ta or Sn-W-Nb-Ta are closely related to biotite granites, two-mica granites or muscovite granites and albite granites respectively. The important deposit types of W, Sn, Nb and Ta and their major features in the Nanling Range are summarized in the paper. The chloritized granite type tin deposit is proposed. This paper indicates that an attention to searching for both the chloritzed granite type tin deposits and greisen-quartz vein type W-Sn deposits in W-Sn-bearing granites in the Nanling Range should be especially paid. |
| |
| Keywords: | ore-bearing granite types geochemisty evolution of granites W-Sn-Nb-Ta deposit types Nanling Range |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《高校地质学报》浏览原始摘要信息 |
| 点击此处可从《高校地质学报》下载免费的PDF全文 |
|
