内蒙古赤峰市鸭鸡山钼铜矿成矿流体特征及矿床成因

J4 ›› 2010, Vol. 40 ›› Issue (1): 61-72.

内蒙古赤峰市鸭鸡山钼铜矿成矿流体特征及矿床成因

李碧乐¹|张娟^1|2|张晗¹|许庆林¹|于泽新³

1.吉林大学地球科学学院|长春 130061;2.辽宁省有色地勘局 |104 队|辽宁营口 115007;3.朝阳金达集团实业有限公司|辽宁朝阳 122000

收稿日期:2009-08-20 出版日期:2010-01-26 发布日期:2010-01-26
作者简介:李碧乐(1965-)|男|湖北武汉人|教授|主要从事热液矿床成矿理论及预测研究|E-mail:lbl66@sina.com
基金资助:
全国危机矿山接替资源找矿项目（200823003，200623018）

Ore-Forming Fluid Features and Metallogenesis of Yajishan Molybdenum-Copper Deposit, Chifeng Area, Inner Mongolia

LI Bi-le¹|ZHANG Juan^1,2|ZHANG Han¹|XU Qing-lin¹|YU Ze-xin³

1.College of Earth Sciences|Jilin University|Changchun 130061|China;2.No. 104 Team of Liaoning Institute, Geological Exploration for NonFerrous Metals, Yingkou|Liaoning 115007|China;3.Chaoyang |Jinda Group Co. Ltd., Chaoyang|Liaoning 122000|China

Received:2009-08-20 Online:2010-01-26 Published:2010-01-26

摘要/Abstract

摘要：

鸭鸡山钼铜矿床所处大地构造位置为蒙古-鄂霍次克造山带的温都尔庙-翁牛特旗褶皱带，该带是我国重要的有色金属成矿带之一。鸭鸡山钼铜矿床分布受控于区域EW向深断裂，矿体产于EW向主断裂F₁上盘的二长花岗岩体中，严格受东西向F₁断裂和北东向断裂控制。该矿床矿石自然类型为石英脉型和蚀变岩型，矿石中硫化物主要有黄铁矿、辉钼矿和黄铜矿。石英流体包裹体有气液两相、含子矿物三相和纯气相3种类型。流体盐度（w（NaCl））为2.06%~44.00%，集中在40%~44%和4%~8%；流体密度为0.85~1.25 g/cm³，集中在1.20~1.24 g/cm³和0.88~0.92 g/cm³；成矿温度为167~380℃，集中在320~360℃和200~220℃；流体盐度、密度、成矿温度在直方图上均表现为双峰特征。研究表明:成矿早阶段流体为高盐度、高密度和高温的岩浆流体，气相包裹体与含子晶三相包裹体共存，表明该阶段发生过强烈的沸腾或不混溶；成矿晚阶段为低盐度、低密度和中温的混合流体。通过等容线图解法估算成矿压力为274.7~368.5 MPa，用静岩压力梯度估算成矿深度为8.32~11.2 km。矿床成因类型为中成、中高温热液脉型矿床。

关键词: 流体包裹体；热液脉型矿床；鸭鸡山；赤峰;钼矿;铜矿

Abstract:

The studied area is located in the Wenduermiao-]Wengniuteqi fold belt, one of the most important nonferrous metal metallogenic belts in China. Tectonically, the belt belongs to the Mongolia-Okhotsk orogenic belt. The orebodies are hosted in the monzonitic granite in the hanging wall of EW-striked F₁, and strictly controlled by EW-and NE-striked faults. Naturally, the deposit belongs to altered rock type and quartz vein type, and the sulfides in ore veins are dominated by pyrite, chalcopyrite and molybdenite. Fluid inclusions in quartz crystals can be further classified into three subtypes; aqueous and gas two-phase，daughter crystal-bearing three-phase and pure gas phase. The salinities of fluid inclusions range from 2.06% to 44.00% NaCl eqv，concentrated in two ranges of 40%-44% NaCl eqv and 4%-8% NaCl eqv. The densities of fluid inclusions range from 0.85 to 1.25 g/cm³，concentrated in two ranges of 1.2-1.24 g/cm³ and 0.88-0.92 g/cm³. The homogenization temperatures of fluid inclusions range from 167℃ to 380℃，concentrated in two ranges of 320-360℃ and 200-220℃. The salinities，densities and homogenization temperatures of fluid inclusions are all bimodal in the histograms. During the early ore-forming stage，the ore-forming fluids are magma fluids with high temperature， salinity and density, and the coexisting fluid inclusions of daughter crystal-bearing three-phase and pure CO₂ indicate they were formed by boiling or immiscibility during the late magma crystallization. In the late ore-forming stage，the ore-forming fluids are mixed fluid with low salinity and density and moderate temperature. According to the diagram of liquid-vapor relations for the NaCl-H₂O system and coexistence surface，the ore-forming pressure is estimated in the range of 274.7-368.5 MPa, corresponding to the ore-forming depth of 8.32-11.2 km. Genetically, the Yajishan molybdenum copper deposit is defined as mesozonal，meso-hypothermal deposit.

Key words: fluid inclusion；hypothemal vein-typed deposit；Yajishan；Chifeng;molybdenum deposits;copper deposits

中图分类号:

P618.4

李碧乐, 张娟, 张晗, 许庆林, 于泽新. 内蒙古赤峰市鸭鸡山钼铜矿成矿流体特征及矿床成因[J]. J4, 2010, 40(1): 61-72.

LI Bi-le, ZHANG Juan, ZHANG Han, HU Qing-lin, XU Ze-xin. Ore-Forming Fluid Features and Metallogenesis of Yajishan Molybdenum-Copper Deposit, Chifeng Area, Inner Mongolia[J]. J4, 2010, 40(1): 61-72.

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