Mineralogická charakteristika granátického skarnu z lokality Trohanka pri Prakovciach (gemerikum, Slovenská republika)

Q3 Earth and Planetary Sciences Bulletin Mineralogie Petrologie Pub Date : 2021-01-01 DOI:10.46861/bmp.29.230

Pavol Myšľan, Peter Ružička, Martin Števko, Tomáš Mikuš

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Abstract

Garnet skarn mineralization was recently studied at the Trohanka locality near Prakovce (Gemeric Unit, Eastern Slovakia). Ca-skarn forms lenticular bodies in green schist environment. It mainly consists of zonal garnets, pyroxenes, amphiboles and magnetite accumulations. Studied garnets are rich in andradite component (up to 89.95 mol. %) with minor grossular component (6.83 - 39.67 mol. %). Strong oscillatory zoning in andradite is caused by substitution of Fe3+ and Al3+. Most pyroxenes are rich in the hedenbergite component. In some cases, euhedral diopside crystals with marginal transition zones (composed of diopside with lower content of Mg2+ and higher content of Fe2+) were found in hedenbergite matrix. Amphiboles are dominantly represented by ferro-actinolite and ferro-hornblende in association with isolated euhedral crystals of ferro-tschermakite and ferro-pargasite. Indistinct chemical zonality of amphibole euhedral crystals is caused by presence of ferro-pargasite in the central parts and ferro-tschermakite in the peripheral parts of crystals.

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Prakovciach（gemerikum，斯洛伐克共和国）Trohanka手榴弹岩石的矿物学特征

最近在斯洛伐克东部Prakovce附近的Trohanka地区研究了石榴石夕卡岩成矿作用。卡矽卡岩在绿片岩环境中形成透镜体。主要由带状石榴石、辉石、角闪石和磁铁矿组成。石榴石中含有丰富的赤铁矿成分(高达89.95 mol. %)和少量的粗铁成分(6.83 ~ 39.67 mol. %)。强振荡分带是由Fe3+和Al3+的取代引起的。大多数辉石都含有丰富的钙辉石成分。在hedenbergite基质中，还发现了具有边缘过渡带的自形透辉石晶体(由Mg2+含量较低、Fe2+含量较高的透辉石组成)。角闪石以放线石铁和角闪石铁为主要代表，并与铁闪石铁和铁闪石铁分离的自面体晶体相结合。角闪洞自面体晶体的化学地带性不明显，主要是由于晶体中心部分存在铁闪辉石，外围部分存在铁闪辉石。

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Bulletin Mineralogie Petrologie Earth and Planetary Sciences-Economic Geology

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期刊介绍： Bulletin Mineralogie Petrologie is a peer-reviewed journal focused especially on: mineralogy, crystal chemistry and study of crystal structures of minerals study of mineral associations and processes of their origin meteoritics, research of tectites economic geology (of ore deposits) and study of history of mining of ore deposits topographic mineralogy petrology of igneous, metamorphic and sedimentary rocks instrumental analytical methods at mineralogy and petrology mineralogy and petrology as tools for archeology and similar disciplines