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The high‐K calc‐alkaline Alagoinhas pluton: anisotropy of magnetic susceptibility, geochemistry, emplacement setting, and implications for the evolution of Borborema Province, NE Brazil

2009; Taylor & Francis; Volume: 51; Issue: 6 Linguagem: Inglês

10.1080/00206810902818594

1938-2839

Gorki Mariano, Paulo de Barros Correia, Sérgio P. Neves, Adejardo Franciso da Silva Filho,

Geochemistry and Elemental Analysis

Abstract The Alagoinhas pluton is a member of the widespread high‐K calc‐alkaline association of northeastern Brazil. Some authors suggest that this region represents an amalgamation of distinct tectonic terranes assembled during the Brasiliano (Pan‐African) orogeny. Our work compares geochemical data (major, trace and REE) of the Alagoinhas with other plutons of same petrotectonic association (Caruaru‐Arcoverde batholith). These plutons apparently intrude several distinct tectonic terranes, separated by a major E‐W dextral transcurrent system, the East Pernambuco shear zone (EPSZ). Anisotropy of magnetic susceptibility and structural data for the Alagoinhas pluton are used to compare tectonic regimes across the EPSZ. The results indicate that the Caruaru‐Arcoverde batholith and the Alagoinhas pluton evolved from similar sources and were subjected to the same tectonic regime during emplacement, placing severe restrictions on use of the EPSZ as a suture zone between distinct tectonic terranes. Keywords: Borborema Provincehigh‐K calc‐alkalineanisotropy of magnetic susceptibilitytectonic terranes Acknowledgement This work was partially supported by grants from CNPq (Conselho Nacional de Desenvolvimento Científico e Tecológico).