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.

在Tharsis、Sotiel等矿的黄铁矿矿石中观察到沉积构造。这些构造表明，一些矿体沉积在海底斜坡上，然后通过滑塌作用沿海底斜坡运移。根据构造和微构造分析，矿床和围岩经历了三个阶段的褶皱。第一期褶皱作用较后两期褶皱作用强烈，控制了岩石的分布格局，按特征矿物将矿床划分为富磁黄铁矿、富重晶石和富锡铜矿床三大类。从硫分析来看，该带矿床可分为四类：S正值矿床(圣特尔莫群)，正值最大值；三角洲；34&gt；S值最负；S重视(Tharsis集团)，并居于力拓和Tharsis集团(Aljustrel集团)之间的中间位置。

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).