Stratiform Tungsten deposits: a review

Abstract

Based mostly on a review of the existing literature and on the experience of the author, a new classification and diagrammatic representation of stratiform tungsten deposits is proposed. It includes three classes of deposits: 1) continental weathering deposits essentialy of exogenic origin; 2) Exhalative-volcanogenic deposits divided into proximal, distal and metamorphic-amphibolite types; 3) Concordant replacement deposits divided into calc-silicate band and hornfels band types. An epigenetic two stage model is proposed for the formation of stratiform tungsten mineralizations associated with calc-silicate bands; this model can be applied to the genesis of Central Sweden tungsten deposits.