%0 Journal Article
%T Geological, mineralogical and geochemical properties of the Daˋbaˋˋ skarn ores (Araklˋ-Trabzon, NE Turkey)
%A Yˋlmaz DEMˋR
%J -
%D 2019
%X The Daˋbaˋˋ skarns have developed as an exoskarn type along the nearest border of Upper Cretaceous Daˋbaˋˋ Granitoid and block- and lens-shaped limestones of Berdiga Formation. The early garnets are predominantly grossular type (And0每0.81Grs59.69每78.65Prs21.35每38.11), while pyroxenes have a composition between diopside and hedenbergite (Hed24.44每31.81Diy67.3每76.99Joh0.52每0.88). The late garnets are characterized by high andradite (And74.67每100Grs0每22.8Prs0每4.51), and late pyroxenes by increasing johannsenite content (Hed22.17每62.63Diy0每36.2Joh31.86每76.69). High andradite content of late garnets is similar to Cu每Fe-type skarns, whereas the higher johannsenite and Mn/Fe ratios of pyroxenes are similar to Zn-type skarns. Higher andraditic garnets indicate an oxidized-type skarn and association with the shallow emplacement of intrusion. Increasing And/Grs ratios of garnets, from core to rim, also point out to increasing degree of oxidation. The retrograde skarn minerals are epidote, tremolite-actinolite, quartz, calcite, and chlorite. The ore minerals are composed of magnetite, hematite, pyrrhotite, pyrite, chalcopyrite, sphalerite, and galena. The Ag content of the galena (1.18-1.43wt%) suggests significant silver potential. Daˋbaˋˋ Granitoid shows high-K (2.38每3.75wt.% K2O), calc-alkaline, metaluminous每peraluminous transitional (A/CNK=0.88每1.23) and volcanic arc type granitoid. The various main and trace element contents of the granodiorite observed along the skarn zones show similarities with Fe每Cu每Zn type skarn-related granitoids, whereas there is no clear relation between the skarn type and composition of outher granitoids. Therefore, the presence of sulfur phases in addition to the oxide ore suggests that geochemical characteristics of granitoid had a large effect on the mineral composition
%K Daˋbaˋˋ skarn yataˋˋ
%K skarn mineralojisi
%K skarn jeokimyasˋ
%K Daˋbaˋˋ granitoyidi
%K Araklˋ- Trabzon
%U http://dergipark.org.tr/bulletinofmre/issue/36480/457070