Investigation on evaluation for mineralization potential of magmatic hydrothermal systems

岩浆热液系统成矿潜力评价研究

• 批准号: 10305076
• 负责人: IZAWA Eiji
• 金额: $ 20.17万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10305076/
• 关键词: mineralization potential; magmatic hyrdrothermal systems; Hishikari; alteration zoning; age determination; boiling zones; autoclave experiments; adsorption experiments; シンター; 金の吸着実験; レーザーラマン分光法; 沸騰帯; 流通式オートクレーブ; アダカイト; XRF; 菱刈; 金鉱床

To develop the evaluation procedure for the mineralization potential of magmatic hydrothermal systems the evolution of systems and factors controlling concentration of metals were examined on several important systems, emphasizing three dimensional structures, distribution of the boiling zone and information of the shallow part of systems. Major areas include Lepanto/FSE-Victoria, Kasuga, Hishikari, Kushikino, Fuke, Cibaliung, Iwami, Northern Queensland, Hoshino and Noya. Together with some experimental works the following important results were obtained.1. Adakitic volcanic rocks were found in the areas of Kushikino, Hoshino and Iwami.2. Age determination using fission track, K-Ar and ^<40>Ar/^<39>Ar methods for volcanic rocks and ores clearly showed that in a certain area the hydrothermal activity starts about 500,000 years after the commencement of the volcanic activity, and continues about 500,000 years with intermittent fracture formation.3. If shallow part of a system is preserved, sinters may exist and the higher gold content of sinters indicates the possible gold mineralization.4. The regional thermal structure of a hydrothermal system is constructed by hydrothermal alteration zoning. The area bounded by 150-200 C isotherms indicates the fracture system and extends for 3 km by 4 km.5. Boiling zones are indicated by occurrence of bladed calcite/quartz, adularia and truscottite, and also by characteristics of fluid inclusions.6. Flow-through type autoclave experiments indicate that concentrations of Si, Al and Ca in hydrothermal waters increase transiently during fracture formation.7. Adsorption experiments of gold on Al and Fe(III) hydroxides suggest that deposition of gold is strongly controlled by adsorption process.

为了建立岩浆热液系统的成矿潜力评价方法，对几个重要系统进行了系统演化和金属浓度控制因素的研究，重点研究了系统的三维结构、沸腾区分布和系统浅部的信息。主要地区包括乐班东/FSE-Victoria、Kasuga、Hishikari、Kushikino、Fuke、Cibaliung、Iwami、北昆士兰、星野和Noya。结合一些实验工作，得到了以下重要结果：在Kushikino、Hoshino和iwami地区发现了埃达基火山岩。2 .利用裂变径迹法、K-Ar法和^<40>Ar/^<39>Ar法对火山岩和矿石进行年龄测定，清楚地表明某地区在火山活动开始后约50万年开始了热液活动，并持续了约50万年，间歇性地形成裂缝。如果系统的浅层部分保存完好，则可能存在烧结矿，烧结矿含金量较高，表明可能存在金矿化。热液系统的区域热结构是由热液蚀变分带构造的。以150 ~ 200℃等温线为界的区域为裂缝系，延伸3 ~ 4 km。沸点区由叶状方解石/石英、阿胶石和长链长岩的出现以及流体包裹体的特征来指示。流动型高压釜实验表明，在裂缝形成过程中，热液中Si、Al和Ca的浓度会短暂升高。金在Al和Fe（III）氢氧化物上的吸附实验表明，金的沉积受吸附过程的强烈控制。

项目成果

Agung HARIJOKO: "Hydrothermal alteration in the Francis Creek area, North Queensland, Australia"Proc. Int. Symp. On Gold and Hydrothermal Systems. 135-140 (2001)

Agung HARIJOKO：“澳大利亚北昆士兰州弗朗西斯溪地区的热液蚀变”Proc。

Akiko USHIDA: "Gold content in siliceous deposits formed from acidic and iron-rich geothermal waters at Hatchobaru, central Kyushu, Japan"Resource Geology. Vol.51. 269-271 (2001)

Akiko USHIDA：“日本九州中部八丁原的酸性和富含铁的地热水形成的硅质沉积物中的金含量”资源地质学。

Nanshi ZENG et al.: "Silver mineralogy and paragenesis in the Kangjiawan Pb-Zn-Ag-Au deposit of the Shuikoushan Mineral District, Hunan Province, China"The Canadian Mineralogist. Vol.38. 11-22 (2000)

Nanshi Zeng等：“中国湖南省水口山矿区康家湾铅锌银金矿床的银矿物学和共生”加拿大矿物学家。

Takushi YOKOYAMA et al.: "Uptake of Au (III) Ions by Aluminum Hydroxide and Their Spontaneous Reduction to Elemental Gold (Au(0))"Jour.Colloid & Interface Science. Vol.233. 112-116 (2001)

Takushi YOKOYAMA 等人：“氢氧化铝吸收 Au (III) 离子及其自发还原为元素金 (Au(0))”Jour.Colloid

Satoshi KAJINO: "Spatial Varialion in Major VeinMinarals at Hishikavi Gold Peposit." Proc.Russian-Japan “Minaralijatianin Arc“. 86-88 (1998)

Satoshi KAJINO：“Hishikavi Gold Peposit 的主要矿脉空间变化”，俄罗斯-日本“Minaralijatianin Arc” 86-88 (1998)。