藏东母拉同铅锌矿地质特征及控矿因素
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摘要
母拉同矿床大地构造位置处于班公湖—怒江蛇绿混杂岩带北东侧边界处,属三江成矿带中北段,区内成矿地质条件良好。分别从地层、构造、岩浆岩、1∶5万水系沉积物测量等方面总结了矿区成矿地质背景,分析了水系沉积物异常特征及岩石地球化学剖面特征,总结了矿床控矿因素。研究表明:(1)母拉同铅锌矿床具有良好的找矿潜力,区内NW向2组次级断裂破碎带的交汇部位为主要的容矿空间;(2)成矿有利地段具有明显的Ag、As、Cu、Pb、Sb、Sn等元素异常组合,且异常浓集中心较为突出;(3)成矿物质来源与超基性岩块无明显的成因联系,而与中酸性闪长玢岩脉存在成因关系;(4)硅化、褐铁矿化为矿区重要的间接找矿标志,地表铅锌矿(化)体露头、褐铁矿带为矿区的直接找矿标志;(5)矿石以侵染状、脉状为主,团块状、角砾状矿石主要分布于破碎带中。上述分析对于进一步在班公湖—怒江蛇绿混杂岩带东段寻找铜、铅、锌等有色金属矿产资源具有一定的参考价值。
The tectonic position of Mulatong Deposit is located at the north eastern boundary of Bangong-Nujiang ophiolite belt,belonging to the northern part of Sanjiang Metallogenic Belt,and the metallogenic geological conditions are good in the area. The metallogenic geological background of the mining area is summarized from four aspects,such as strata,structure,magmatic rock,1∶ 50 000 stream sediment survey,and the anomalous characteristics of stream sediment survey and geochemical profile of the rocks are discussed,besides that,the ore-controlling factors are summarized. The study results show that:(1)Mulatong Pb-Zn Deposit has good prospecting potential,the intersection of the two groups of NW trending secondary faults in the area is the main ore-holding space;(2)favorable sections of the ore-forming zone has obvious abnormal combination of Ag,As,Cu,Pb,Sb,Sn and other elements,and the anomaly concentration center is more prominent;(3)there is no obvious genetic relation between the source of metallogenic materials ultrabasic rock blocks,but genetic relationship with the porphyrite dike and the source of metallogenic materials is existed;(4)silicification and ferritization are the important indirect prospecting indicators,and the Pb-Zn ore( melt) outcrop and limonite ore belt in the surface of mining area are the direct prospecting indicators;(5)the ore shapes are mainly for invaded and veined,the ores with the shapes of crumby and breccia are mainly distributed in the fractured zone. The above study results related to Mulatong Pb-Zn Deposit can provide reliable reference for the further prospecting work of nonferrous metal mineral resources such as copper,lead and zinc in the east section of Bangong-Nujiang ophiolite belt.
The tectonic position of Mulatong Deposit is located at the north eastern boundary of Bangong-Nujiang ophiolite belt,belonging to the northern part of Sanjiang Metallogenic Belt,and the metallogenic geological conditions are good in the area. The metallogenic geological background of the mining area is summarized from four aspects,such as strata,structure,magmatic rock,1∶ 50 000 stream sediment survey,and the anomalous characteristics of stream sediment survey and geochemical profile of the rocks are discussed,besides that,the ore-controlling factors are summarized. The study results show that:(1)Mulatong Pb-Zn Deposit has good prospecting potential,the intersection of the two groups of NW trending secondary faults in the area is the main ore-holding space;(2)favorable sections of the ore-forming zone has obvious abnormal combination of Ag,As,Cu,Pb,Sb,Sn and other elements,and the anomaly concentration center is more prominent;(3)there is no obvious genetic relation between the source of metallogenic materials ultrabasic rock blocks,but genetic relationship with the porphyrite dike and the source of metallogenic materials is existed;(4)silicification and ferritization are the important indirect prospecting indicators,and the Pb-Zn ore( melt) outcrop and limonite ore belt in the surface of mining area are the direct prospecting indicators;(5)the ore shapes are mainly for invaded and veined,the ores with the shapes of crumby and breccia are mainly distributed in the fractured zone. The above study results related to Mulatong Pb-Zn Deposit can provide reliable reference for the further prospecting work of nonferrous metal mineral resources such as copper,lead and zinc in the east section of Bangong-Nujiang ophiolite belt.
引文
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[3]李玉龙,杨竹森,田世洪,等.“三江”中段两类碳酸盐岩容矿铅锌矿化成因的相关性——来自稀土元素地球化学研究的启示[J].岩石矿物学杂志,2015,34(5):648-664.
[4]刘长征,陈岳龙,许光,等.地球化学块体理论在青海沱沱河地区铅锌资源潜力预测中的应用[J].地学前缘,2011,18(5):271-282.
[5]潘桂棠,李兴振,王立全,等.青藏高原及邻区大地构造单元初步划分[J].地质通报,2002,21(11):701-708.
[6]潘桂棠,莫宣学,侯增谦,等.冈底斯造山带的时空结构及演化[J].岩石学报,2006(3):521-533.
[7]肖霞,倪师军,白涛,等.西藏妥坝地区水系沉积物地球化学特征及找矿靶区[J].矿物岩石地球化学通报,2016(3):570-575.
[8]肖霞,倪师军,冯德新,等.西藏察雅县大木南铅锌多金属矿地质特征及找矿前景[J].有色金属工程,2016(2):75-79.
[9]蒋光武,谢尧武,白珍平,等.青藏高原班公湖—怒江缝合带丁青—碧土段大地构造演化[J].地质通报,2009,28(9):1259-1266.
[10]樊炳良.丁青缝合带东段超基性岩块含矿性评价[D].成都:成都理工大学,2016.
[11]樊炳良,白涛,冯德新,等.丁青宗白蛇绿混杂岩岩石地球化学及Sr-Nd-Pb同位素特征[J].有色金属工程,2018(1):111-116.