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Geocronologia do maciço Granítico Sararé no SW do Cráton Amazônico

Authors: de Araújo, Larissa Marques Barbosa; Godoy, Antonio Misson; Ruiz, Amarildo Salina;

Geocronologia do maciço Granítico Sararé no SW do Cráton Amazônico

Abstract

O Maciço Sararé ocorre no sudoeste do Estado de Mato Grosso, intrusivo em unidades mesoproterozóicas do Bloco Jauru do Cráton Amazônico. Trata-se de um corpo com 80 km2, forma elíptica a alongada, segundo o trend da tectônica regional NW-SE. É constituído por três fácies petrográficas principais de composição monzograníticas, leucocráticas, vermelhas, isotrópicas a foliadas na borda e equi- a inequigranulares a localmente porfiríticas. Constitui num granito do Tipo S, peraluminoso, tardi a pós-cinemático, apresentam idades 40Ar/39Ar obtidas a partir de biotitas e muscovitas de 903 a 906 Ma. interpretada como o período de resfriamento das rochas do maciço e idade U-Pb de 917 ± 18 Ma. interpretada como idade de cristalização do corpo intrusivo. As rochas do maciço foram geradas a partir da fusão de material da crosta superior, em ambiente de colisão continental e/ou de descompressão pós-colisional, pertence ao magmatismo regional tardi a pós-cinemático ao final do evento Aguapeí-Sunsás, e da estabilização tectônica do extremo meridional do Cráton Amazônico.

Sararé Massif occurs in the southwest Mato Grosso state intruded into Mesoproterozoic units of the Jauru Block inside the Amazonian Craton. It presents an extension of approximately 80 km2 and NW-SE tectonic structures control the elongated shape. It is constituted by three major monzogranitic petrographic facies, represented by leucocratic, reddish, isotropic, equi-inequigranular to locally porphyritic rocks. The composition indicates S-type, peraluminous, with indicatives of late- to post-kinematic magmatism. Geochronological studies with 40Ar/39Ar in biotites and muscovites resulted in ages of 903 to 906 Ma was interpreted as massif rocks cooling period and U-PB 917 ± 18 Ma. ages points to the crystallization of the intrusive body. The massif is formed by melting of material of the upper crust, in an environment of continental collision and/or of post-collisional decompression at the ending of the Aguapeí-Sunsás event, in more stable environments of consolidation and tectonic stabilization of the Amazonian Craton.

Country
Brazil
Keywords

Sararé massif, decompression, crystallization, Geochronology, mountain, geochronology, age determination, South America, granitoid, petrography, stabilization, craton, Mato Grosso, porphyry, Amazonian craton, continental lithosphere, Brazilian Shield, magmatism, Sarare, consolidation, Brazil, argon-argon dating, granite

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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