内蒙古二道河子铅锌矿成因研究

J4 ›› 2011, Vol. 41 ›› Issue (6): 1745-1754.

• 兴蒙造山带及邻区中生代岩浆活动与金属成矿作用专辑 • 上一篇下一篇

内蒙古二道河子铅锌矿成因研究

李进文¹|梁玉伟²|王向阳³|张斌¹|杨郧城¹|佘宏全¹|郭志军¹

1.中国地质科学院矿产资源研究所|北京100037;
2.内蒙古第一地质矿产勘查开发院|呼和浩特010020;
3.内蒙古根河市森鑫矿业开发有限责任公司|内蒙古根河022350

收稿日期:2011-07-08 出版日期:2011-11-26 发布日期:2011-11-26
作者简介:李进文(1964-)|男|山西阳高人|研究员|主要从事矿床学和矿产勘查学研究|E-mail:lijinwen958@sohu.com
基金资助:
中国地质调查局地质调查项目（1212011085260）；国家重点自然科学基金项目(41030421);国家科技支撑计划项目（2006BAB01A10）；内蒙古地质矿产勘查开发局综合研究项目（ND2007004）

The Origin of the Erdaohezi Lead-Zinc Deposit, Inner Mongolia

LI Jin-wen¹,LIANG Yu-wei²,WANG Xiang-yang³,ZHANG Bin¹,YANG Yun-cheng¹,SHE Hong-quan¹,GUO Zhi-jun¹

1.Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing100037, China;
2.No.1 Institute of Geology and Mineral Resources Development, Huhhot010020, China;
3.Senxin Mining Development Co., Ltd.,Genhe022350, Inner Mongolia, China

Received:2011-07-08 Online:2011-11-26 Published:2011-11-26

摘要/Abstract

摘要：

基于矿床地质调查，并通过岩矿石地球化学和锆石U-Pb测年研究，探讨了二道河子铅锌矿床成因。该矿床赋存于中侏罗统塔木兰沟组中，受北西向断裂-裂隙构造控制，矿体多呈脉状，围岩以火山岩为主，夹有砾岩。据常量、微量、稀土元素和Pb、Sr、Nd同位素测试结果:火山熔岩中SiO2质量分数为48.01%～56.44%，岩屑晶屑凝灰岩中为69.09%～71.73%。前者稀土总量高于后者，两者稀土配分型式相似，均显弱负铕异常；而前者Pb、Zn、Cu等成矿元素的含量却远低于后者。火山岩富集Rb、U、Th等大离子亲石元素，Sr普遍亏损，相对亏损Nb、Ta以及Ti等高场强元素。火山岩I_Sr=0.704 925~0.706 632，ε_Nd（t）＝0.5~2.0，ε_Sr（t）＝8.5~32.8，t_DM=619~730 Ma。火山岩和矿石的Pb同位素组成十分接近，²⁰⁶Pb/²⁰⁴Pb=18.130～18.475，²⁰⁷Pb/²⁰⁴Pb=15.526～15.567，²⁰⁸Pb/²⁰⁴Pb =38.078～38.286，μ值为9.32～9.40。矿床主要围岩岩屑晶屑凝灰岩的SHRIMP锆石U-Pb年龄为(164.2±2.3) Ma,这表明火山岩为混有壳源物质的幔源岩浆形成。火山活动分为2期：早期表现为中（基）性火山喷发；晚期岩浆活动发生于中侏罗世晚期，形成酸性火山碎屑岩。成矿物质由与火山岩有关的岩浆系统提供，富集于晚期岩浆中。与成矿有关的侵入岩可能是晚期岩浆作用形成的次火山岩。矿床可能是岩浆分异的含矿热液沿火山岩中的断裂、裂隙充填交代形成，成矿时代为中侏罗世晚期-晚侏罗世。

关键词: 铅锌矿, 地球化学, SHRIMP锆石U-Pb测年, 矿床成因, 二道河子, 内蒙古

Abstract:

Controlled by NW-trending fractures, the Erdaohezi lead-zinc deposit occurs in volcanic rocks and conglomerate of the Tamulangou Formation in the Hailaer-Genhe Jurassic volcanic fault-depression basin. Its ore bodies are mainly of vein type. Based on geological and geochemical investigation of volcanic rocks and ores as well as dating of volcanic rocks, the authors studied the genesis of the ore deposit. An analysis of major elements, trace elements, rare earth elements and Pb, Sr and Nd isotopes has revealed that the content of SiO2 in the lava is 48.01%-56.44% and that of the lithic crystal tuff is 69.09%-71.73%, and that Pb, Zn and Cu values in the former are much lower than those in the latter. The two kinds of rocks have similar REE patterns, characterized by weak Eu negative anomalies. LILE such as Rb, U and Th are rich in the volcanic rocks, while Sr and such HFSE as Nb, Ta and Ti are relatively depleted. In the volcanic rocks, I_Sr=0.704 925-0.706 632, ε_Nd(t)=0.5~2.0, ε_Sr(t)=8.5-32.8 and t_DM=619-730 Ma. In addition, the composition of Pb isotopes in volcanic rocks is very close to that in sulfide ores, their ²⁰⁶Pb/²⁰⁴Pb,²⁰⁷Pb/²⁰⁴Pb and ²⁰⁸Pb/²⁰⁴Pb ratios are 18.130-18.475, 15.526-15.567 and 38.078-38.286 respectively, with μ values being 9.32-9.40. With the SHRIMP zircon U-Pb method, the lithic crystal tuff was dated at (164.2±2.3) Ma. These data indicate that the magma that formed the volcanic rocks was derived from the mantle with the mixture of a small amount of crustal materials, and the ore-forming materials came from the magma system. The volcanism had experienced two phases: early magma was mainly intermediate, whereas late magmatism occurred in late Middle Jurassic and formed acid volcanic clastic rocks. Ore-forming material was abundant in the late magma, which might have also formed sub-volcanic rocks related to the mineralization. Ore-forming fluids from late magma differentiation might have formed the ore deposit by filling and metasomatism along the fractures in volcanic rocks and conglomerate, and the mineralization occurred in late Middle Jurassic to Upper Jurassic period.

Key words: lead-zinc deposit, geochemistry, SHRIMP U-Pb dating, genesis, Erdaohezi, Inner Mongolia

中图分类号:

P618.4

李进文, 梁玉伟, 王向阳, 张斌, 杨郧城, 佘宏全, 郭志军. 内蒙古二道河子铅锌矿成因研究[J]. J4, 2011, 41(6): 1745-1754.

LI Jin-wen, LIANG Yu-wei, WANG Xiang-yang, ZHANG Bin, YANG Yun-cheng, SHE Hong-quan, GUO Zhi-jun. The Origin of the Erdaohezi Lead-Zinc Deposit, Inner Mongolia[J]. J4, 2011, 41(6): 1745-1754.

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内蒙古二道河子铅锌矿成因研究

The Origin of the Erdaohezi Lead-Zinc Deposit, Inner Mongolia

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