吕杜,艾金彪,魏宇,郭耀文.都龙锡锌多金属矿田万龙山矿区矽卡岩矿物特征及成因意义[J].地质找矿论丛,2019,34(2):201-212
都龙锡锌多金属矿田万龙山矿区矽卡岩矿物特征及成因意义
Characteristics of skarn minerals in Wanlongshan mining district of Dulong Sn-Zn polymetallic ore field and their genetic significance
投稿时间:2018-08-11  修订日期:2018-12-21
DOI:10.6053/j.issn.1001-1412.2019.02.006
中文关键词:  万龙山锡锌矿区  都龙锡锌多金属矿田  矽卡岩矿物特征  矿物组合  矿床成因  云南省
英文关键词:Wanlongshan Sn-Zn mining district  Dulong Sn-Zn polymetallic ore field  characteristics of skarn minerals  mineral assembly  genesis of the deposit  Yunnan province
基金项目:四川省冶金地质勘查局重点科研项目(编号:[2016]196)和商业地勘重点找矿勘探项目资助成果。
作者单位
吕杜 四川省冶金地质勘查院, 成都 610051 
艾金彪 四川省冶金地质勘查院, 成都 610051 
魏宇 四川省冶金地质勘查院, 成都 610051 
郭耀文 四川省冶金地质勘查院, 成都 610051 
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中文摘要:
      万龙山锌锡矿床是都龙锡矿田的一个重要矿区。通过矽卡岩岩石化学研究,认为矿区矽卡岩属于钙矽卡岩,在w(SiO2)—w(CaO)图解中,矿区矽卡岩与花岗岩、大理岩投点区呈线性展布,表明三者之间具有成因联系。对矿区主要的矽卡岩矿物石榴子石、辉石、角闪石、绿帘石和绿泥石进行了电子探针成分分析:石榴子石属于钙铝榴石-钙铁榴石系列,端元组分以钙铝榴石为主(体积分数51.02%~82.63%),钙铁榴石体积分数为12.45%~47.74%;辉石为透辉石-钙铁辉石系列,端元组分以钙铁辉石为主,明显缺乏透辉石;角闪石属于Mg-Fe-Mn-Li组,主要为镁角闪石;绿帘石中Fe的含量较;绿泥石主要为铁镁绿泥石,部分为铁斜绿泥石、密绿泥石或铁绿泥石,显示富镁铁质的特点。依据矽卡岩矿物的组分特征对矿区矽卡岩的成因、成矿条件及矿床成因等进行了讨论,认为矿区矽卡岩及金属矿化主要与晚白垩世老君山花岗岩具有成因关系,锡锌多金属矿床属于岩浆热液渗透交代型矿床。
英文摘要:
      Wanlongshan Sn-Zn polymetallic deposit is an important mining district in Dulong Sn-Zn polymetallic ore field. Skarn in the ore field is petrochemically studied showing that it is a Ca-skarn. In the plot SiO2-CaO projection points of skarn, granite and marble from the ore field are linearly distributed suggesting that they are genetically related. Electronic probe analysis is carried out on the skarn minerals of garnet, pyroxene, hornblende, epidote and chlorite. The result is that the garnet belongs to grossularite-Ca-Fe garnet series with the end component dominated by grossularite(51.02% to 82.63%), Ca-Fe garnet about 12.45% to 47.74%; pyroxene belongs to diopside-hedenburgite series with the end component dominated by hedenburgite and without diopside; hornblende belongs to Mg-Fe-Mn-Li group dominated by Mg-hornblende; Fe is higher in the epidote; chlorite is dominated by brunsvigite with some Fe-rhombic chlorite and ripidolite characterized by rich in Mg and Fe. Based on the above characteristics of the skarn minerals the ore-forming condition and genesis of the deposit are discussed and it is considered that the skarn and Sn-Zn polymetallic mineralization are genetically related to Cretaceous Laojunshan granite and the deposit is a magma hydrothermal fluid infiltrating replacement type deposit.
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