THE KAKOPETROS AND RAVDOUCHA IRON-OXIDE DEPOSITS, WESTERN CRETE, GREECE:FLUID TRANSPORT AND MINERALIZATION WITHIN A DETACHMENT ZONE

Citations Over Time

Abstract

Small iron deposits at Kakopetros and Ravdoucha in western Crete are hosted by an extensional detachment zone at the roof of the high-pressure–low-temperature metamorphic core complex known as the Phyllite-Quartzite unit. The iron oxides occur in a brecciated layer of phyllite, quartzite, and marble up to tens of meters thick. They fill fractures and vugs in the breccia and partly impregnate the marble. The iron oxides, which were formerly mined in open pits, are predominantly composed of goethite and subordinate oxyhydroxides of the manganomelane group. The field relationships and microstructures indicate that precipitation of the iron-oxide minerals was related to fluid flow focussed along the detachment fault. δ 18 O values of goethite indicate crystallization at low temperatures (31°–40°C) and at a shallow depth of about 1 km. Microscopic investigations show that the deposition of iron oxides was syntectonic and occurred during deformation in the uppermost crust. Similar iron oxides are reported from low-angle brittle detachment horizons in the Cordilleran metamorphic core complexes of North America and suggest that small iron- and manganese-oxide deposits of this type may be a characteristic feature of detachment zones.

Related Papers

• → Geology, geochemistry and tectonic settings of the molybdenum deposits in South China: A review(2016)72 cited
• → Early Jurassic rare metals mineralization in Nanling Region: A case of Daping granite porphyry in Southwest Fujian(2020)5 cited
• → The Bouznika Cambrian barite deposit (Morocco), an early mineralization on the Iapetus margin(2011)20 cited
• Original rocks,ages,and its significance for the wall rock of Niutougou gold deposit in northern Helan Mountains(2010)
• → Mineralization types in the Mozambique Belt of eastern Zambia(1994)6 cited