BECCHIO Raul Alberto
Proyecto de Calidad de Control Fase I
BECCHIO RAÚL; GUADALUPE ARZADÚN; SEGGIARO, R.; SOFÍA BORDESE; MELINA CELEDON; HERNANDEZ. R; ULRICH GLASMACHER
Naturaleza de la
determinaciones de laboratorio y trabajo de campo
Campo de Aplicación:
The main objective of this proyect is erform the quality control of thermochronologicalmeasurements of apatite fission track (AFT) and zircon fission track (ZFT) of LaTe Andes S.A geothermochronological laboratory. For this purpose they are taken 11 samples of Salta (Argentina) and 4 samples of Heidelberg (Germany) of variable lithologies (sandstones,greywacke, granites, tuffs). They are taken 4 kg of each sample and are separated into two aliquots of 2 kg each. One aliquot is processed in the University of Heidelberg laboratory and the other one in the LaTe Andes laboratory. Finally, based on the comparison of the results, the analysis technique will be adjusted in the laboratory of LaTe Andes. Currently, there exist a discrepancy about the evolution of the Andean fold belt in Eastern Cordillera area. Whereas some authors propose a thrust sequence model according to the classical idea, recently studies present evidence of discontinuous thrust evolution, typical of a fragmented foreland basin.On the studied area exist a sequence of five main thrusts that configured the mountain range system between the Lerma Valley and El Toro Valley. They are meridional oriented and have double vergence. The Tastil and Mojotoro thrusts, located on the west and east respectively, haveeastern vergence. Pascha ? Golgota ? Arenales and San Lorenzo have western vergence. All thrustsinclude basement deformation and exhibit a pre-Cretaceous heterogeneous substrate (Fig. 3).This thrust system is truncated to the south by El Toro lineament. On the western area, the Paleozoic sequences underlying post rift deposits on both sides of lineaments, while on the eastern area, outcrop sinrift deposits on Paleozoic unit, on the south of the lineament and postrift deposits on the north, showing a clear evidence of inversion tectonic. The proposed sampling is oriented to determine the uprising time of each trust to improve the characterization of the fold belt evolution on the north of El Toro lineament. Also, uprising time information of mountain range that are immediately on the south of El Toro lineament will be an important contribution to the development of the regional tectonic model.