QE231 : Investigation of genesis of copper mineralization associated with Eocene volcanic and volcano-sedimentary rocks of northern margin of Central Iran Zone, east and southeast of Shahrood
Thesis > Central Library of Shahrood University > Geosciences > MSc > 2014
Authors:
Abstarct: copper deposits in Central, Northern and Southern Choghndrsar, Gerik, Gorkhan, Narteluei, Asteghani, Gachconom, Alhak (1) and Alhak (2) are located at a distance of approximately 100 to 120 kilometers northeast and East and South-East Shahrood on the edge of Iran's central structural zone. Sequence of volcanic rocks and volcano-sedimentary rocks of the region are included. This area consists of an intermediate basic lava sequence - and middle Eocene pyroclastic rocks. Studied volcanic rocksconsists of a compositional range of olivine basalt, andesybasalt tracks, tracki-andesite, basalt that represents a subtraction serie of olivine basalt to andesite tracks. These rocks show enrichment of light REE and large ion Litophile element and depletion of heavy REE. Negative anomalies in high field magnitude elements such as Ti and Nb in the studied rocks is one of the typical characteristics of arc environments. According to geochemical surveys, copper deposit of Shahrood's Eastern and Southeastern tectonic environment is consist of a stretch region that formed in a back-arc basin. Eastern and South-Eastern Shahrood Mineralization is formed as depositional veins - veinlets, scattered grains and filled cavities. Primary formed minerals is consists of chalcocite, bornite, natural copper, pyrite and chalcopyrite. Secondary oxide and carbonate minerals such as hematit, and malachite cuprite formed in the surface due to weathering. The dominant alteration in host rocks consist of hematite, chlorite, sericitic, silica and carbonate. Microthermometry study of fluid inclusions in the ore-bearing calcite veins indicate that most of the fluids are two-phase and liquid - vapor (L + V) type with 10.1 wt% NaCl salinity and mean homogenization temperature of 264 °C. According to basic characteristics of copper mineralization in the East and South-East of Shahrood has many similarities to the large copper deposits of volcanic red laxyer in terms of tectonic settings, encompassing rock, mineralogy, mextal content, alteration and mineralization.
Keywords:
#The stretch #back - arc #copper #volcanic - red laxyer #Shahrood
Keeping place: Central Library of Shahrood University
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Keeping place: Central Library of Shahrood University
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