| dos Santos, Cláudia, Danderfer Filho, André, Queiroga, Gláucia N., Zincone, Stefano A., De Castro, Marco P., Lana, Cristiano C. (2020) Ferroan alkalic volcanism associated with Calymmian rifting in the Paramirim aulacogen, São Francisco craton, Brazil: New insights from lithofacies analysis and evidence of mantle-derived alkaline H2O-rich metasomatic fluids affecting ancient crustal materials. Precambrian Research, 340. 105632 doi:10.1016/j.precamres.2020.105632 | Journal (article/letter/editorial) | higher concentration of Na-rich fluids synthesized aegirine at a minimum temperature of 200°C and promoted...ferromagnesian minerals, such as fayalite, hedenbergite, aegirine, Na-amphibole and aenigmatite. Due to these differences...The typical signal intensity was approximately 10 V for 177Hf. The isotopes 172Yb, 173Yb and 175Lu...present significant amounts of small and euhedral aegirine crystals in the groundmass and filling small quartz...(Figs. 4f, 5b and 5d; Table 2). Intriguingly, some aegirine grains occur encompassing and/or associated with |
|