By Andrés Folguera, Maximiliano Naipauer, Lucía Sagripanti, Matías C. Ghiglione, Darío L. Orts, Laura Giambiagi
This ebook offers fresh findings at the constitution and evolution of the Southern Andes. via an in depth description of a chain of orogenic segments reviewed through the several teams that experience labored with structural and geophysical instruments in every one zone during the last numerous years, it illustrates the range of mechanisms that experience impacted powerful orogenic gradients and for this reason mountain morphology, from the southern Pampean flat subduction region to the southern tip of the continent (33-56º S). The e-book additionally revises our traditional figuring out of the resource of different Mesozoic to Cenozoic sections exhumed within the orogenic wedge, with the target of discussing basin mechanisms via time. a last bankruptcy discusses possible orogenic controls that experience acted jointly so one can clarify constitution, different deformational levels and intra-orogenic extensional collapses that affected the fold and thrust belt over the years.
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Extra info for Growth of the Southern Andes
In the northeastern foreland region, the San Rafael block is developed, while to the east Las Matras-Chadileuvú block is exposed, as part of a broken foreland system. East of the North Patagonian Cordillera (Ramos 1999), the North Patagonian Massif is developed, delimiting the southern part of the Neuquén Basin. In the west the Central Depression and the Changes in Source Areas at Neuquén Basin: Mesozoic Evolution … 35 Fig. 1 Location of the main morphotectonic features in the Southern Central Andes between 34° and 41°S.
According to these studies the main volcanic (plutonic) source rock was the Choiyoi volcanic rocks with minor participation of the Precuyano magmatism. Preliminary U–Pb detrital zircon ages from the El Freno Formation conﬁrm these data, where the age pattern showed main peaks at ca. 204–230 Ma (Precuyano) and 250–262 Ma (Choiyoi) (Fig. 5a) (Naipauer et al. 2014b). Changes in Source Areas at Neuquén Basin: Mesozoic Evolution … 45 Fig. 5 Paleogeographic sketch map with potential source regions: a Precuyano cycle and Cuyo Group (Late Triassic to Early–Middle Jurassic); b Tordillo Formation, base of the Mendoza Group (Late Jurassic) Absolute ages of the synrift volcanism, in the southern part of the basin in the Neuquén Province, range between 219 and 182 Ma (Rapela et al.
These rocks are grouped in the Guaraco Norte Formation and U–Pb (SHRIMP) on detrital zircons indicated a maximum depositional age at ca. 373 Ma (Zappettini et al. 2012); the pattern of detrital zircons is completed with Ordovician and minor Mesoproterozoic peaks. Based on this fact the metasedimentary sequences of the Piedra Santa and Guaraco Norte Formations are correlated. On the Chilean margin, metamorphic complexes occur as part of the Coastal Cordillera; these are flanked to the east by the Coastal Batholith (Fig.