The Piquiri Syenite Massif, southernmost Brazil, is part of the post-collisional magmatism related to the Neoproterozoic Brasiliano-Pan-African Orogenic Cycle. The massif is about 12 km in diameter and is composed of syenites, granites, monzonitic rocks and lamprophyres. Diopside-phlogopite, diopside-biotite-augite-calcic-amphibole, are the main ferro-magnesian paragenesis in the syenitic rocks...

We studied partially altered veined nepheline syenites at the Chernihivka carbonatite massif of Azov region, Ukraine. The major minerals syenite are albite, nepheline, biotite and calcite. Fluorapatite, allanite-(Ce), monazite-(Ce), barite stronalsite occur as minor accessory phases. primary minerals, containing REE in rocks, reflect re-equilibration a mineral/fluid systems recrystallization ro...

Abstract The Permo-Carboniferous Oslo Rift is a narrow, aborted continental rift with comparatively little extension but voluminous magmatism, developed at Proterozoic lithospheric discontinuity. On the southern flank of onshore part rift, multiple intrusive phase Larvik plutonic complex (LPC) encompasses almost width conspicuous over- to undersaturated assemblage monzonite (larvikite, tønsberg...