| 山东招远九曲金矿床成矿流体地球化学特征 |
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| 引用本文： | 丛智超,孙丰月,王力,杨桂彬.山东招远九曲金矿床成矿流体地球化学特征[J].世界地质,2015,34(2):362-371. |
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| 作者姓名： | 丛智超 孙丰月 王力 杨桂彬 |
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| 作者单位： | 1. 吉林大学 地球科学学院，长春 130061; 2. 山东黄金矿业 (玲珑) 有限公司，山东 招远 265419 |
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| 摘 要： | 九曲金矿位于招远—平度成矿带内,地处胶东金矿集中区的西北部。矿区内出露的岩浆岩为黑云母二长花岗岩、浅色细粒花岗岩及似斑状花岗闪长岩,矿体受断裂构造控制,属石英脉型金矿床。矿化分为四个阶段:石英-黄铁矿阶段、黄铁矿-石英阶段、石英-多金属硫化物阶段及碳酸盐阶段。流体包裹体研究表明,矿体中含金石英脉发育含CO2三相包裹体(Ⅰ型)、气液两相包裹体(Ⅱ型)和纯CO2包裹体(Ⅲ型)3种类型。成矿流体具有由早阶段到晚阶段,温度从中高温(301℃~365℃)到中低温(200℃~256℃)逐渐降低,CO2从富到贫逐渐减少,整体上具有低盐度(3.53%~10.74%Na Cleqv)和低密度(0.55~0.96 g·cm-3)的特点,成矿压力为75~129 MPa,成矿深度为7.04~9.46 km,成分以CO2、H2O为主。δD=-51×10-3~-64.2×10-3,δ18O水=0.9×10-3~7.1×10-3。笔者认为成矿流体以地幔流体为主,后期有大气降水参与;δ34S变化范围为6.4×10-3~7.4×10-3,显示成矿物质为深源含矿岩浆,上涌过程中与赋矿围岩发生重熔。矿床属幔源流体参与成矿的中温热液脉型金矿床。
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| 关 键 词： | 流体包裹体 成矿流体 地球化学特征 山东招远 |
Geochemical characteristics of ore-forming fluds of Jiuqu gold deposit in Zhaoyuan,Shandong |
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| CONG Zhi-Chao,SUN Feng-Yue,WANG Li,YANG Gui-Bin.Geochemical characteristics of ore-forming fluds of Jiuqu gold deposit in Zhaoyuan,Shandong[J].World Geology,2015,34(2):362-371. |
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| Authors: | CONG Zhi-Chao SUN Feng-Yue WANG Li YANG Gui-Bin |
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| Institution: | 1. College of Earth Sciences，Jilin University，Changchun 130061，China; 2. Shandong Gold Mining (Linglong) Co．，Ltd．，Zhaoyuan 265419，Shandong，China |
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| Abstract: | Jiuqu gold deposit is a quartz vein- altered type gold deposit，located at Zhaoyuan- - Pingdu metallo- genic belt in the northwest of eastern Shandong gold concentration area． The igneous rocks exposed in the deposit are mainly composed of biotite monzogranites，light fine- grained granites and porphyry- like granodiorites． Four sta- ges of mineralization were identified，which are quartz- pyrite stage，pyrite- quartz stage，quartz- polymetallic sulfide stage and carbonate stage． The study of fluid inclusion shows that CO2 - bearing three- phase inclusions (type I)， gas- liquid two- phase inclusions (type II) and pure CO2 inclusions (type III) developed in quartz of the main min- eralization． From early to late stage the mineralization fluids demonstrate from low- medium (301℃ ～ 365℃) to medium- high (200℃ ～256℃) in temperature，and CO2 changes from rich to poor in value，and gnerally have the charactes of low salinity (3. 53% ～ 10. 74% NaCleqv) and density (0. 55 ～ 0. 96 g·cm-3 )，with metallogenic pressure and depth of 75 ～129 MPa and 7. 04 ～9. 46 km，respectively． In addition，mineralization fluids have δ18O (0. 9 ×10-3 ～7. 1 ×10-3 ) and δD ( －51 ×10-3 ～ －64. 2 ×10-3) magma and ore- hosting rock in the up- welling process． It is suggested that mantle- derived fluids contribute to mineralization． And the Jiuqu gold deposit should be the mesothermal vein- type gold deposit in genesis． |
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| Keywords: | fluid inclusion ore- forming fluid geochemical characteristics Zhaoyuan of Shandong |
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