DEFORMATION PATTERNS IN THE SOUTHERN BRAZILIAN BRANCH OF THE DOM FELICIANO BELT - A REAPPRAISAL

被引：141

作者：

FERNANDES, LAD

TOMMASI, A

PORCHER, CC

机构：

[1] Instituto de Geociências, Universidade Federal do Rio Grande do Sul, 91501 Porto Alegre, RS

[2] Curso de Pós-Graduao em Geociências-UFRGS, 91501 Porto Alegre, RS

来源：

JOURNAL OF SOUTH AMERICAN EARTH SCIENCES | 1992年 / 5卷 / 01期

关键词：

D O I：

10.1016/0895-9811(92)90061-3

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Structural mapping of key areas linked by reconnaissance investigations in the southern Brazilian portion of the Brasiliano/Pan-African Dom Feliciano Belt has shown the importance of large-scale flat-lying and strike-slip shear zones in the tectonic evolution of this belt. These zones of intense deformation form km-thick mylonitic belts in Brasiliano granites and supracrustal rocks as well as their Transamazonian/Eburnian basement. Structures developed within flat-lying shear zones under metamorphic conditions of amphibolite facies are interpreted as having formed during oblique collision between crustal blocks - the Kalahari Craton and the Magmatic Arc I - in which the direction of tectonic transport was NW-SE. Further collision between this assemblage and the Rio de La Plata Craton gave rise to a transpressive regime whose tectonic transport direction is indicated by regionally consistent NE/SW-oriented stretching lineations, parallel to the belt's length.

引用

页码：77 / 96

页数：20

共 95 条

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