Manganese pyroxenoids and carbonates: Critical phase relations in metamorphic assemblages from the Alps期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Manganese pyroxenoids and carbonates: Critical phase relations in metamorphic assemblages from the Alps

Authors:	Tj Peters V Trommsdorff J Sommerauer

Institution:	(1) Mineralogisch-Petrographisches Institut, Universität Bern, Sahlistraße 6, CH-3012 Bern;(2) Institut für Kristallographie und Petrographie, ETH-Zentrum, CH-8092 Zürich

Abstract:	The compositions of coexisting pyroxmangites, rhodonites, rhodochrosites and manganese calcites in regional metamorphosed manganese cale-silicate marbles from Val Scerscen and Alagna were analysed by microprobe and permit definition of critical tie lines at metamorphic grades appropriate to temperatures between 400 and 450 °C.Variations in composition of coexisting mineral pairs in one and the same locality are attributed to variations in $f_{{\text{CO}}_{\text{2}} }$ and not to metamorphic temperatures. From the analysed assemblages isothermal $f_{{\text{CO}}_{\text{2}} } - X_{{\text{Ca/Ca + Mn}}}$ plots (with SiO₂ as excess component) were constructed for the system CaO-MnO-SiO₂-CO₂.

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