吉林大学学报(地球科学版) ›› 2017, Vol. 47 ›› Issue (3): 760-774.doi: 10.13278/j.cnki.jjuese.201703110

• 地质与资源 • 上一篇    下一篇

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

杨启军1,2, 秦亚1,2, 王泰山3, 张青伟1,2   

  1. 1. 桂林理工大学广西矿冶与环境科学实验中心, 广西 桂林 541004;
    2. 桂林理工大学广西隐伏金属矿产勘查重点实验室, 广西 桂林 541004;
    3. 青海省地质调查院, 西宁 810012
  • 收稿日期:2016-09-07 出版日期:2017-05-26 发布日期:2017-05-26
  • 作者简介:杨启军(1964-),男,副教授,主要从事岩石学及构造地质学的科研及教学工作,E-mail:qijunyang@glut.edu.cn
  • 基金资助:
    广西壮族自治区国土资源厅找矿突破战略行动地质矿产勘查项目（桂国土资函[2016]429）；广西自然科学基金项目（2014GXNSFBA118230）

Chronology and Geochemical Characteristics of Monzogranitic Porphyry from Fozichong Ore Field in Guangxi Province and Their Geological Implication

Yang Qijun1,2, Qin Ya1,2, Wang Taishan3, Zhang Qingwei1,2   

  1. 1. Guangxi Scientific Experiment Center of Mining, Metallurgy and Environment, Guilin University of Technology,Guilin 541004,Guangxi, China;
    2. Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration, Guilin University of Technology, Guilin 541004, Guangxi, China;
    3. Qinghai Geological Survey Institute, Xining 810012, China
  • Received:2016-09-07 Online:2017-05-26 Published:2017-05-26
  • Supported by:
    Supported by Geology and Mineral Resources Exploration Project of Prospecting Breakthrough Strategic Action of Department of Land and Resources of Guangxi Zhuang Autonomous Region (G.G.T.Z.H. No.[2016]429) and Natural Science Foundation of Guangxi Province (2014GXNSFBA118230)

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摘要： 佛子冲铅锌矿田位于广西岑溪市诚谏镇境内，从北向南主要由古益、河三、龙湾3个铅锌矿床组成。矿田内发育有三期花岗质侵入岩及两期火山岩，其中二长花岗斑岩与成矿关系密切，是本文研究的重点。通过对二长花岗斑岩的野外地质、岩相学、地球化学特征的研究，结合矿田内控岩控矿构造的研究，探讨二长花岗斑岩的成因，确定佛子冲铅锌矿的成矿地质体及成矿构造。利用LA-ICP-MS对采自古益、河三、龙湾的二长花岗斑岩进行锆石U-Pb定年，获得加权平均年龄分别为（105.1±1.7）、（105.2±0.5）、（104.2±1.5） Ma。主量元素成分显示，二长花岗斑岩为准铝—弱过铝高钾钙碱性I型花岗岩。球粒陨石稀土元素模式图特征显示，轻稀土强烈富集，具有显著的Eu负异常。在微量元素原始地幔标准化蛛网图中，显示强烈的Ti、P负异常和Pb的正异常。主微量元素特征显示二长花岗斑岩起源于地壳，并经历了同化混染和分离结晶作用（ACF）过程。二长花岗斑岩的εSr（t）为78.98~162.66、εNd（t）为-10.4~-8.3，亏损地幔模式年龄为1.424~1.672 Ga，进一步表明二长花岗斑岩来自中—古元古代基底的部分熔融，进而可能暗示佛子冲矿田与云开古陆具有相同的前寒武纪基底，是云开古陆的组成部分。二长花岗斑岩的空间展布、断裂构造的控岩控矿特征显示，二长花岗斑岩侵位中心位于矿田南部的新塘，向北进行岩墙扩展式侵位，是太平洋板块向欧亚板块俯冲的产物。二长花岗斑岩是龙湾、河三矽卡岩型矿床相关的花岗岩体，也是古益岩浆热液型矿床的成矿地质体，从河三、龙湾的矽卡岩型矿床，到古益岩浆热液充填型矿床，构成了同时同成因的热液矿床系列。

关键词: 佛子冲矿田, 二长花岗斑岩, 年代学, 地球化学, 成矿作用

Abstract: The Fozichong lead-zinc ore field is located in Cenxi County, Guangxi Province. From south to north, there occur Guyi, Hesan and Longwan ore deposit. Three periods of granitic rock and two periods of volcanic rock develop in the ore field. Among them, the monzogranitic porphyry played very important role in the mineralization, and has been researched in this paper. It crops out as stock and dyke along NNE-extending to SN-extending faults.To determine the petrogenesis of the monzogranitic porphyry, the metallogenic intrusion and structures of the Fozichong ore field, geologic features, petrography and geochemistry of the monzogranitic porphyry have been involved. The LA-ICP-MS zircon U-Pb dating of monzogranitic porphyry from the three ore deposits reveals that the monzogranitic porphyry in Hesan, Guyi and Longwan simultaneously emplaced at late period of Early Cretaceous, with the duration of (104.2~105.2) Ma. Its geochemical characteristics indicate that the monzogranitic porphyry is high-K, calc-alkaline, metaluminous I-type monzogranitic.The value of εSr(t) varies from 77.98 to 162.66, and that of εNd(t) from -10.4 to -8.3. The depleted mantle model age of monzogranitic porphyry is 1.424~1.672 Ga. The isotope trace suggests that the magma was resulted from the partial melting of Meso-proterozoic meta-igneous rock in middle crust, which implies that the Fozichong ore field has same Precambrian basement as the adjacent Yunkai blok.The Fozichong ore field maybe the part of Yunkai block.The monzogranitic porphyry was induced by the subduction of Pacific Ocean plate to Euro-Asia plate. Besides, Hesan and Longwan ore deposits are skarn-type related to monzogranitic porphyry and carbonate rock. The Guyi deposit belongs to hydrothermal-type related to marble and the‘green rock',a kind of skarn too.The monzogranitic porphyry is not only the ore-forming materials source but also the dynamic source of ore-forming process, composing a typical metallogenic system from skarn-type to hydrothermal-type.

Key words: Fozichong ore field, monzogranitic porphyry, chronology, geochemistry characyeristic, ore-forming process

中图分类号: 

  • P588.12
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