Frontal and oblique tectonics in the Brazilian Shield  

作　　者：GinaldoA.daC.Campanha BenjamimBleydeBritoNeves 

机构地区：[1]InstitutodeGeociěnciasdaUniversidadedeSāoPaulo,Brazil.Address：RuadoLago,562-CidadeUniversitária,SāoPaulo-SP,Brazil,CEP

出　　处：《Episodes》2004年第4期255-259,共5页地质幕（英文版）

摘　　要：The Brazilian shield was assembled from a few Archean and Paleoproterozoic cratonic nuclei surrounded by Pan-African-Brasiliano mobile belts of Neoproterozoic age. While some of these mobile belts display a typical frontal collision tectonic style, others are dominated by transcurrent regimes, clearly indicating oblique collisional systems. This paper is an attempt to determine the mean orientation of the principal horizontal compressive stresses for each mobile belt, considering either the frontal or oblique convergence character. From these general observations a scheme with WNW - ESE to NWSE trends of the main compressive stress is proposed. We suggest that this trend represents the mean displacement vectors, according to a coherent kinematic picture for the amalgamation of the West Gondwana during the final stages of convergence of the Brasiliano belts, where WNW-ESE to NW-SE are the main directions of final closure.

关 键 词：巴西大陆地盾 倾斜构造 太古代 克拉通板块 原生代 

分 类 号：P534.1[天文地球—古生物学与地层学] P542.4[天文地球—地质学]