Zircon U-Pb dating and petrogenesis of the São José do Campestre Granite Complex, NE Brazil: an example of neoarchean mantle-derived post-collisional magmatism

This article discusses the geochemical and petrological evolution of São José do Campestre granite complex (SJCgr), last Neoarchean plutonic event so far described in massif NE Brazil. We report field, petrographic, zircon U-Pb dating, whole rock mineral chemistry for representative SJCgr samples. Laser ablation data indicate that emplacement took place at 2664 ± 13 Ma. The rocks comprising have relatively well-preserved primary textures fabrics compositions varying from gabbro to syenogranite. Major trace element contents reveal a metaluminous, calc-alkaline through transitional alkaline signature, LILE- LREE-enriched series analogous late Archean sanukitoid modern arc granitoid. is envisaged as follows: (1st) partial melting metasomatized mantle (2.5–3.0 GPa, ~85–102 km, 1,000–1,200°C), generating basaltic andesitic magma; (2nd) fractional crystallization (FC) olivine or lower crustal depth, leading parental magmas magmatic series; (3rd) 40–15% FC gabbro-norite monzonite cumulates (400–600 MPa, 15–23 km). shares similarities with post-collisional granitoids and, thus, would represent episode mantle-derived magma Northeastern