Abstract
The structural framework of the north-central Guiana Shield: a fossil fold-and-thrust belt in northeastern Roraima state, Brazil
Highlights
The north-central Guiana Shield preservesshallow crustal rocks, generated during the Middle to Late Orosirian, which are represented by the Roraima Supergroup volcano-sedimentary sequences and its basement
The purpose of this work is the study of a set of structures present in the central Orocaima Igneous Belt and its immediate overlying sedimentary succession, the Arai Formation, which composes the geological framework of northeastern Roraima state (Brazil)
The airborne gammaspectrometric data allows evaluating the concentrations of potassium (K) and equivalent thorium and uranium expressed in the colours of the RGB ternary composition image
Summary
The north-central Guiana Shield preservesshallow crustal rocks, generated during the Middle to Late Orosirian, which are represented by the Roraima Supergroup volcano-sedimentary sequences and its basement. This basement rocks consist of widely dispersed volcanic successions and associated shallow-granitoids (Orocaima Igneous Belt). 1.49-1.15 Ga; Santos et al 2006b), these successions recorded partial positive inversion due to uplift and lateral escape tectonics They promote the reactivation of pre-existing normal faults associated with far-field intraplate stresses derived from collisional tectonics at the edge of the continent (Pinheiro et al 1990; Fraga et al 2017b; Reis et al 2017). The tectonic evolution in the north-central Guiana Shield remains a contentious topic, as the structural architecture was not yet clearly set out and evaluated in more detailed studies
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