Tisovci（斯洛伐克共和国）Magneto-vrch地区Ca矽卡岩中的钛安卓石手榴弹的化学分带性

Q3 Earth and Planetary Sciences

Bulletin Mineralogie Petrologie Pub Date : 2021-01-01 DOI:10.46861/bmp.29.049

Peter Ružička, Pavol Myšľan, Martin Števko, Sergii Kurylo

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引用次数: 0

摘要

在斯洛伐克共和国的Tisovec附近的Magnet hill地区分析的石榴石是钙矽卡岩矿物组合的一部分，该矿物组合由辉长石、斜长石和方解石组成。其主要成分为富钛安长石(adr50.9 ~ 73.7)，含少量粗晶石(grs3.8 ~ 44.5)和榴辉石(sch0.5 ~ 41.5)。石榴石的TiO2含量高达13 wt. %，其中YFe3+>的比例占主导地位。观察到扇形和振荡化学带，这主要是由单个石榴石晶体中Ti含量的变化分布引起的。在BSE成像中，三个主要区域被区分开来。最亮的是钛富集区，钛含量在0.85 ~ 0.50 apfu之间。钛在过渡区逐渐减少(0.17 ~ 0.40 apfu)，在暗区达到最小值(0.01 ~ 0.13 apfu)。在富钛区，由于Ti4+和Fe3+的替代和假设的水石榴石替代(SiO4)4-↔(O4H4)4-， Si4+和Al3+的含量降低。

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Chemická zonálnosť Ti-andraditového granátu v Ca-skarne z oblasti Magnetový vrch pri Tisovci (Slovenská republika)

Analyzed garnets from the Magnet hill area near Tisovec (Slovak Republic) are part of a Ca-skarn mineral association consisting of diopside, clinochlore and calcite. Compositionally they correspond to Ti-rich andradite (Adr50.9-73.7) with minor grossular (Grs3.8-44.5) and schorlomite (Sch0.5-41.5) components. Garnets contain up to 13 wt. % TiO2 and in all of them YFe3+>YTi ratio prevails. Both sector and oscillatory chemical zoning were observed, which is primarily caused by variable distribution of Ti contents within individual garnet crystals. The three principal zones were distinguished in BSE imaging. The brightest are Ti-enriched zones with Ti content ranging from 0.85 to 0.50 apfu. Titanium gradually decreases in transitional zone (0.17 - 0.40 apfu) and reaches the minimum values in the dark zones (0.01 - 0.13 apfu). In the Ti-enriched zones the content of Si4+ and Al3+ is decreased due to substitution of Ti4+ and Fe3+ and assumed hydrogarnet substitution (SiO4)4- ↔ (O4H4)4-.

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来源期刊

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