Perovskite-group minerals from the Rio Apa and Amambay regions, NE Paraguay

Abstract

Perovskite-group minerals of alkaline-carbonatitic rocks from the Rio Apa and Amambay regions in Eastern Paraguay are members of the perovskite-lueshite-loparite-latrappite solid-solution series. Strontian-loparite is prevailing in the fenitized trachytic rocks and defines an evolutionary trend represented by an increase of Sr and LREE. The crystallization of the perovskite-group minerals resulted probably from metasomatic processes caused by fluids derived from cognate alkaline or carbonatitic sources, at relatively low temperatures (e.g. 400-700°C)

Keywords

• Perovskite
• Alkaline rocks
• Carbonatites
• Eastern Paraguay