Accretionary models for the Neoproterozoic evolution of the Borborema Province: advances and open questions

Abstract

The current knowledge on the accretionary evolution of the Borborema Province is evaluated considering recently published data and interpretations. Early to late Neoproterozoic eclogite, ophiolite, and magmatic arc remnants have been documented and point to oceanic crust consumption. Isotopic contrasts as well as geophysical anomalies across the major domain boundaries are suggestive of collisional sutures and a speculative model of terrane accretion is presented here. On the other hand, the lack of concise evidence for some of the proposed deep-seated structures as well as putative lithospheric continuity in both sides of it suggest reworking of previously continuous lithosphere through intracontinental deformation in localized sectors of the province interior. It is patent that one model does not preclude the other and available evidence so far has triggered the emergence of conciliatory proposals for the Neoporterozoic history the Borborema Province.

Spectral characterization of the Umbuzeiro Doce skarn target (Brazil): insights for the exploration of a W-Mo-gemological vesuvianite system

“…Being located in the South American Platform, the Borborema Province is a Neoproterozoic orogen with Archean and Paleoproterozoic blocks metamorphized and deformed at ca. 600-500 Ma, and abundant Ediacaran-Cambrian plutons related to the Western Gondwana collage during the Neoproterozoic (Almeida et al 1981, Hollanda et al 2010, Brito Neves et al 2014, Caxito et al 2020, Santos and Caxito 2021). This province is commonly divided into three sub-provinces (Northern, Central, and Southern), all of them being segmented by extensive E-W and NE-SW shear zones (Van Schmus et al 1995, 2003 (Fig.…”