INVESTIGADORES
RAPELA Carlos Washington
capítulos de libros
Título:
The granites of northern Patagonia and the Gastre Fault System in relation to the break-up of Gondwana
Autor/es:
RAPELA, C.W.; PANKHURST, R.J
Libro:
Magmatism and the Causes of Continental Break-Up
Editorial:
Geological Society of London
Referencias:
Año: 1992; p. 209 - 220
Resumen:
The transcurrent Gastre Fault System in central Patagonia, which is
closely associated with subvolcanic granite emplacement, is recognized as a
major dextral shear-zone and geological boundary. We propose its equivalence to
a Late Triassic-Jurassic precursor of the Aghulas Fracture Zone, allowing
dextral displacement of the Southern Patagonian Block relative to the rest of
South America during the earliest rifting phase of Gondwana break-up. This
model could explain some of the inferred movement of the Falkland/ Malvinas
Islands and alleviate geometrical problems inherent in reconstructions of the South
Atlantic region. It can also explain unique geological features of southern
Patagonia, such as the Upper Triassic to Lower Jurassic calc-alkaline
granitoids of the North Patagonian Massif and the extensive silicic volcanism
of Mid-Late Jurassic times. The magmatism is seen as a consequence of the mechanism
of Gondwana disintegration and it is not necessary to invoke a relationship to
deep mantle structure or plume activity.