Stratabound tungsten mineralization in regional metamorphic calc-silicate rocks from the Austroalpine Crystalline Complex,Austria |
| |
| Authors: | J G Raith |
| |
| Institution: | (1) Department of Mineralogy and Petrology, Mining University Leoben, A-8700 Leoben, Austria |
| |
| Abstract: | Stratabound tungsten mineralization in regional metamorphic calc-silicate rocks of probably Lower Paleozoic age is described from the polymetamorphic Austroalpine Crystalline Complex (ACC) of the Eastern Alps. Scheelite-bearing calc-silicate rocks which are often associated with marbles and tourmalinites are intercalated conformably with metaclastic rocks. Alkalipoor calc-silicate rocks with high amounts of clinozoisite/ zoisite, grossular, quartz, plagioclase, etc. are the most important host rocks for tungsten mineralization. These unusual calc-silicate rocks are products of regional metaorphism and are interpreted as reaction skarns. They have formed in the presence of a water-dominated fluid phase with very low XCO2.In the Koralpe estimated P-T conditions are 650–700 °C at 5–7 kb. The mineralogical composition and the mineral zoning of the calc-silicate rocks is controlled by the degree of the Hercynian and Eoalpine metamorphism. There are no signs of graniteelated skarn formation. Tungsten preconcentration is thought to be syngenetic/syndiagenetic. It is genetically linked to exhalative hydrothermal processes in other Lower Paleozoic terrains of the Eastern Alps. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
