山东玲珑金矿床成矿流体地球化学特征

山东玲珑金矿床成矿流体地球化学特征

王可勇¹, 张春燕², 樊岳铭²，张晓东³

1.吉林大学地球科学学院，长春 130061;2.山东招远玲珑金矿，山东招远 265400;3.辽宁五龙四道沟金矿，辽宁丹东 118000

收稿日期:2007-06-25 修回日期:1900-01-01 出版日期:2008-03-26 发布日期:2008-03-26
通讯作者: 王可勇

Geochemical Characteristics of Ore-Forming Fluids of the Linglong Gold Deposit in Shandong Province

WANG Ke-yong¹,ZHANG Chun-yan²，FAN Yue-ming²，ZHANG Xiao-dong³

1.College of Earth Sciences, Jilin University, Changchun 130061, China;2.Linglong Gold Mine, Zhaoyuan, Shandong 265400, China;3.Sidaogou Gold Mine, Dandong, Liaoning 118000, China

Received:2007-06-25 Revised:1900-01-01 Online:2008-03-26 Published:2008-03-26
Contact: WANG Ke-yong

摘要/Abstract

摘要： 玲珑金矿床第一成矿阶段与含金黄铁矿共生的石英中主要发育4种类型的原生流体包裹体：Ⅰ气液两相，Ⅱ含CO₂三相，ⅢCO₂，Ⅳ单液相包裹体。流体包裹体成分激光拉曼光谱分析及测温结果显示：①Ⅰa型包体，气液比10%～15%，均一温度为162.7～235.6℃，w（NaCl）（盐度）为4.65%～7.59%，气相平均摩尔分数为：H₂O 96.48%，CO₂ 2.4%；②Ⅰb型包体，气液比30%～45%，均一温度266.9～349.2℃，w（NaCl）为10.8%～13.4%，气相平均摩尔分数为H₂O 69.75%，CO₂ 24.74%；③Ⅱ型含CO₂包体，CO₂相所占比例为20%～90%，其均一温度为193.5～321.6℃，w（NaCl）2.9%～5.3%，CO₂相中，H₂O的摩尔分数为27.72%，CO₂为70.6%。包裹体成分分析及测温结果综合研究认为，玲珑金矿成矿过程中存在大气降水热液与地幔来源流体的混合作用，前者与从流体中分离出的富CO₂流体混合，以不同比例被捕获形成Ⅱ型包体；而与分异出CO₂后的CO₂不饱和地幔流体混合，被捕获形成Ⅰb型包体。两种流体混合导致的含矿热液物化条件变化对金的沉淀成矿具有重要意义。

关键词: 山东玲珑金矿床, 流体混合作用, 流体包裹体测温, 激光拉曼光谱分析

Abstract: Four types of primary fluid inclusions developed in quartz that intergrowth with goldbearing pyrite in the Linglong gold deposit, namely, Ⅰ aqueous two-phase; Ⅱ carbon dioxide-bearing three-phase; Ⅲ carbon dioxide and Ⅳ only liquid aqueous phase, respectively. The laser Roman spectroscopic analysis for composition and the microthermometric study of fluid inclusions indicate that: ①type Ⅰa fluid inclusions, in which the vapor volumes occupy 10%-15%, their homogenization temperature is 162.7-235.6℃, salinity is 4.65%-7.59% NaCl, the average composition of vapor phase is 96.48 mol% H₂O and 2.4 mol% CO₂; ② type Ⅰb fluid inclusions, in which the vapor volumes occupy 30%-45% , their homogenization temperature is 266.9-349.2℃, salinity is 10.8%-13.4% NaCl, the average composition of vapor phase is 69.75 mol% H₂O and 24.74 mol% CO₂; ③ type Ⅱ fluid inclusions, with a wide range of 20%-90% for the carbon dioxide volumes in fluid inclusions, their homogenization temperature is 193.5-321.6℃, salinity is 2.9%-5.3% NaCl, the average composition of the carbon dioxide phase is 27.72 mol% H₂O and 70.60 mol% CO₂. Comprehensive study of compositional and microthermometric analysis of fluid inclusions leads to the conclusion that fluid mixing between meteoric water-derived and mantle-derived hydrothermal solutions existed in the metallogenetic process of Linglong gold deposit. The former are mixed with CO₂-rich fluids separated from mantle-derived solutions and then captured at different ratios formed type Ⅱ fluid inclusions; whereas mixed with CO₂-unsaturated fluids which was the remnants of mantle-derived solutions after CO₂ separation, could be captured to form type Ⅰb fluid inclusions. The changes in physico-chemical conditions of ore-forming solutions resulted from two kinds of fluid mixing have great significances to gold mineralization.

Key words: Linglong gold deposit of Shandong Province, fluid mixing, microthermometry of fluid inclusion, Laser Roman spectroscopic analysis of composition

中图分类号:

P618.51

王可勇, 张春燕, 樊岳铭，张晓东. 山东玲珑金矿床成矿流体地球化学特征[J]. J4, 2008, 38(2): 194-0201.

WANG Ke-yong,ZHANG Chun-yan，FAN Yue-ming，ZHANG Xiao-dong. Geochemical Characteristics of Ore-Forming Fluids of the Linglong Gold Deposit in Shandong Province[J]. J4, 2008, 38(2): 194-0201.

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