Pluma magmática no granito de lavadores (V. N. Gaia, NW Portugal)

• Autor(a) principal: Lorenz, A.
• Data de Publicação: 2023
• Outros Autores: Rodrigues, B.C., Pamplona, J., Peternell, M.
• Idioma: por
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: https://hdl.handle.net/1822/86955
• topic: Pluma magmática; Bolha de magma; Granito; Tonalito; Magmatic plume; Magma blob; Granite; Tonalite; Ciências Naturais::Ciências da Terra e do Ambiente

The Lavadores Granite shows a feldspathic plume structure that is an association of an irregular mafic tonalitic layer with an exotic K-feldspar crystallization, plus a heterogeneous nucleation on the tonalite boundary and a dendritic and comb grown, representing an almost completely continuous structure. The observations lead to the hypothesis that the dendritic plume structure crystallization is a result of specific conditions inside schlieren and in their vicinity. The plume structures seem to be crystallized freely inside the open tonalitic layer/schlieren and the model of “hollow space” at the transition zone would explain this free crystallization of the plume structures.