Calc-alkaline volcanic rocks in the pre-Upper Jurassie basement of south-central Mexico--a late Paleozoic-early Mesozoic convergent plate

Abstract:

The limited extension of geological map coverage, the metamorphism of varying degrees that affected the rocks and their almost complete lack of fossils, make the basement be-neath the marine fossiliferous Upper Jurassic and/or Lower Cretaceous sedimentary and volcanic cover rocks to be an unsolved geological problem in south-central Mexico, a region comprising about 20,000 km2 (Figure 1). Radiometric ages (Pb-ot, K-Ar, Rb-Sr, U-Pb) obtained from these rocks are apparently contradictory or not conclusive (de Cserna et al., 1962; de Cserna, Fries, Rincon-Orta, Westley, Solorio-Munguia and Schmitter-Villada, 1974; de Cserna, Fries, Rinc6n-Orta, Solorio-Munguia and Schmitter-Villada, 1974; Guerrero-Garcia et al., 1978; Urrutia-Fucugauchi and Linares, 1981; Lopez-Infanzon and Grajales-Nishimura, 1984; Moran-Zenteno et al., 1990; Moran-Zenteno, 1992). The various paleogeographic and paleotectonic …

Año de publicación:

1994

Keywords:

Fuente:

google