Caracterização faciológica e petrológica das soleiras básicas da região de Picos-PI, porção leste da Bacia do Parnaíba
DOI:
https://doi.org/10.70369/h8gfjv76Palavras-chave:
Formação Sardinha, dolerito, petrografia subvulcânicaResumo
Dois grandes eventos magmáticos básicos, ocorridos durante o Mesozoico, são identificados na Bacia Parnaíba. O primeiro, ocorrido dentro dos limites Juro-Triássico, é correlato à Província Magmática do Atlântico Central (CAMP), sendo expresso pela Formação Mosquito. Este evento ocorre principalmente como fluxos de lava e intrusões de diques e soleiras na porção oeste da bacia. O segundo evento, correspondente ao Cretáceo, é representado pela Formação Sardinha, a qual é expressa principalmente por rochas intrusivas, como diques e soleiras na parte leste da Bacia Parnaíba, cuja origem magmática ainda permanece em discussão. Dessa forma, este presente trabalho objetivou abordar as rochas intrusivas na região de Picos-PI, na porção leste da Bacia Parnaíba. A pesquisa inclui a identificação e classificação faciológica, além da análise petrográfica detalhada das porções de base, núcleo e topo, somada à geoquímica de elementos maiores dessas rochas. Foram descritas soleiras de doleritos, classificados faciologicamente em colunares regulares com fraturas por resfriamento e doleritos maciços, que foram subdivididos em faneríticos e afaníticos. Nos doleritos faneríticos, observou-se texturas subofítica, intergranular e granofírica, enquanto nos afaníticos exibem texturas porfirítica, intrafascicular e intersertal, típicas de cristalização acelerada. Não obstante, através da análise geoquímica, classificamos essas rochas como básicas a intermediárias, metaluminosas, alto TiO2 e toleíticas. Portanto, os resultados indicam que os doleritos passaram por diferentes processos de cristalização durante seu emplacement, em que os doleritos afaníticos sofreram com rápidas taxas de resfriamento. Além disso, através da semelhança petrográfica e geoquímica entre os trabalhos anteriores e nossas amostras, assumimos que estas rochas fazem parte da Formação Sardinha.
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