English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

O Complexo Intrusivo Santa Angelica faz parte de um dos mais importantes plutons de magmatismo bimodal da Suite G5, geradano estagio pos-colisional (530 – 490 Ma) da Orogenese Brasiliana, esta que deu origem ao Orogeno Aracuai-Ribeira. Este corpo intrusivo erepresentado por litotipos felsicos e maficos, sendo estes separados por uma extensa zona de mistura de magmas onde ocorrem rochashibridas. O estudo petrografico microscopico de rochas maficas e hibridas com xenocristais de K-feldspato indicou bordas de reacao nestesgraos constituidas exclusivamente por mirmequita. A fim de compreender quais reacoes xenocristal-liquido desencadearam a formacaodestas bordas mirmequiticas, foram realizadas analises em microssonda que, posteriormente foram interpretadas juntamente ao estudopetrografico microscopio. Os resultados indicaram que as porcoes maficas e hibridas ainda estavam em estado liquido quando houve amigracao dos xenocristais que, ao reagirem com o material magmatico, desencadearam uma reacao envolvendo ions de Ca e Naresultando na formacao de uma borda constituida por mirmequita. Palavras-chave: Santa Angelica, mirmequita, xenocristal. ABSTRACT THE ORIGIN OF MIRMEKITIC BORDERS IN K-FELDSPAR XENOCRYSTALS FROM MAFIC AND HYBRID ROCKS OF SANTA ANGELICAMASSIVE - ES - The Santa Angelica Intrusive Complex is part of the more importants plutons of the G5 Suite of bimodal magmatism,intrudet in the post-collisional (530 - 490 Ma) of the Brasiliano orogeny that made the Orogen Aracuai-Ribeira. This pluton is representedby felsic and mafic rocks, which are separated by an extensive zone of magma mixing and mingling with the occurrence of hybrid rocks. Thepetrographic study of the hybrid and mafic rocks with K-feldspar xenocrysts indicates their edges reaction consist exclusively of mirmekite.In order to understand how xenocristal-liquid reactions triggered the formation of these edges, microprobe analyzes were performed,These data and microscopic results were interpreted together. The results indicated that when the xenocrysts migrated to the mafic andhybrids rocks they were still in the liquid state, resulting in the reaction between the xenocrysts and the Ca and Na ions of the magma thatformatted the myrmekite edge. Keywords: Santa Angelica, myrmekite, xenocristal.

A ORIGEM DAS BORDAS DE MIRMEQUITA NOS XENOCRISTAIS DE FELDSPATO POTÁSSICO EM ROCHAS MÁFICAS E HÍBRIDAS DO MACIÇO SANTA ANGÉLICA – ES