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علوم زمین، جلد ۲۷، شماره Special Journal-۱۰۶، صفحات ۳-۱۲
عنوان فارسی Geologic and geochemical investigation on the Mn veins in Jonub-E Sehchangi, SW Birjand, Southern Khorasan province (east Iran)
چکیده فارسی مقاله Mn-bearing veins of Jonub -ESehchangi are located 200 km southwest of Birjand, Southern Khorasan province (east of Iran). These veins are hosted by andesitic rocks of Eocene to Oligocene ages. Ore minerals identified  by XRD method and mineralographic studies and are Pyrolusite, cryptomelane, psilomelane, hollandite, hematite and goethite, displaying colloform and open-space filling textures. Gypsum, halite, barite, carbonate and silica are the gangue minerals. Alteration zones, specifically argillic alteration zone, are developed along the vein within the andesitic wall rocks. Based on the mineralogical and geochemical data, the primary manganese minerals were Mn oxides and hydroxides, which have gradually been converted to psilomelane and hollandite, and finally pyrolusite. The average grade of Mn within the veins is 38.61%. Considering the average Mn/Fe ratio (about 48.55) in the Mn-bearing veins, as well as the positive correlation of Sr, U and Ba with Mn mineralization in  this area  show hydrothermal origin.
کلیدواژه‌های فارسی مقاله Mn vein، Jonub-E Sehchangi، Andesite، Pyrolusite، Psilomelane، Argillic alteration،
عنوان انگلیسی Geologic and geochemical investigation on the Mn veins in Jonub-E Sehchangi, SW Birjand, Southern Khorasan province (east Iran)
چکیده انگلیسی مقاله Mn-bearing veins of Jonub -ESehchangi are located 200 km southwest of Birjand, Southern Khorasan province (east of Iran). These veins are hosted by andesitic rocks of Eocene to Oligocene ages. Ore minerals identified  by XRD method and mineralographic studies and are Pyrolusite, cryptomelane, psilomelane, hollandite, hematite and goethite, displaying colloform and open-space filling textures. Gypsum, halite, barite, carbonate and silica are the gangue minerals. Alteration zones, specifically argillic alteration zone, are developed along the vein within the andesitic wall rocks. Based on the mineralogical and geochemical data, the primary manganese minerals were Mn oxides and hydroxides, which have gradually been converted to psilomelane and hollandite, and finally pyrolusite. The average grade of Mn within the veins is 38.61%. Considering the average Mn/Fe ratio (about 48.55) in the Mn-bearing veins, as well as the positive correlation of Sr, U and Ba with Mn mineralization in  this area  show hydrothermal origin.
کلیدواژه‌های انگلیسی مقاله Mn vein,Jonub-E Sehchangi,Andesite,Pyrolusite,Psilomelane,Argillic alteration
نویسندگان مقاله Behnaz Barghi |
PhD economic geology

Ali Asghar Calagari |
Professor, Department of Earth Sciences, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran

Mohammad Hossein Zarrinkoub |
Professor, Department of Geology, University of Birjand, Birjand, Iran

Vartan Simmonds |
Associate Professor, Research Institute for Fundamental Sciences, University of Tabriz, Tabriz, Iran

نشانی اینترنتی http://www.gsjournal.ir/article_58346_48cab7a569deb2490d9b2245f5b14bcb.pdf
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