Geological Studies of the "Iberian Pyrite Belt" -with Special Reference to Its Genetical Correlation of the Yanahara Ore Deposits and Others in the Inner Zone of Southwest Japan.

“伊比利亚黄铁矿带”的地质研究——特别是日本西南内陆地区柳原矿床等的成因关联。

• 批准号: 62043051
• 负责人: MITSUNO Chiharu
• 金额: $ 1.86万
• 依托单位: Okayama University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Overseas Scientific Research
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62043051/
• 关键词: Iberian Pyrite Belt; Yanahara ore deposit; Rio Tinto mime; Nerves-Corvo mine; Tharsis mine; colloform texture; コロホルム組織; 舞鶴帯

Sedimentary structures are observed in pyrite ores of the Tharsis, Sotiel mines and so on. These structures show that some of ore bodies deposited on the submarine slope and then were transported along the submarine slope by slumping. The ore deposits ans country rocks have suffered from three stages of folding based on structual and micro-structural analyses. The first stage folidng is more intense than later two foldings and controles the distribution pattern of the rocks.The deposits are divided into three groups by characteristic minerals : pyrrhotite-rich, barite-rich, and tin and copper-rich deposits. These narures of individual deposits may reflect the differences in oxidation-reduction states of mineral deposition, and the the temperatures of hydrothermal solutions responsible for these deposits.From the sulfur analyses, the deposits of the belt are divided into four groups : deposits having positive<delta>^<34>s values(San Telmo Group), having most positive<delta>^<34>s values (Rio Tinto group), haning most negative<delta>^<34>s values(Tharsis group) and occupying the intermediate position between Rio Tinto and Tharsis groups (Aljustrel group).

在塔尔西斯矿、索铁矿等黄铁矿矿石中观察到沉积构造。这些构造表明，部分矿体在海底斜坡上沉积，然后通过滑塌的方式沿海底斜坡移动。根据构造和微观构造分析，矿床和围岩经历了三个阶段的褶皱。第一阶段褶皱比后两阶段褶皱更为强烈，控制着岩石的分布格局。矿床按特征矿物可分为富磁黄铁矿、富重晶石和富锡铜矿3组。单个矿床的这些性质可能反映了矿物沉积的氧化还原状态的差异，以及造成这些矿床的热液温度的差异。根据硫分析，将带内矿床划分为4组：< δ >^<34 b> s值正的矿床（San Telmo组）、< δ >^<34>s值正的矿床（里约热内卢Tinto组）、< δ >^<34>s值负的矿床（Tharsis组）和介于里约热内卢Tinto组和Tharsis组之间的矿床（Aljustrel组）。