Plate Tectonics and Orogenic Belts in the South-east Pacific

Structure and evolution of the Fuegian Andes foreland thrust-fold belt, Tierra del Fuego, Argentina: Paleogeographic implications

“…The known geologic history of southern South America reveals a complex succession of contrasting tectonic regimes, including late Jurassic-early Cretaceous extension, late Cretaceous-Paleogene compression, and Cenozoic strike-slip faulting (Katz, 1972;Dalziel et al, 1974;Dalziel and Palmer, 1979;Kohn et al, 1995;Klepeis, 1994a, b;Kraemer et al, 1996;Kraemer, 2003;Lodolo et al, 2003). Also, several models for orocline or orogenic curve formation at the southernmost Andes have been proposed (Cunningham et al, 1991;Cunningham, 1993;Kraemer, 2003;Diraison et al, 2000;Ghiglione and Cristallini, 2007).…”

“…The early extensional regime involved a rifting phase, related to the development of silicic volcanism in a wide region of southern South America (Bruhn, 1979;Hanson and Wilson, 1991) and to the opening of Rocas Verdes Marginal Basin, partially floored by oceanic crust (Katz, 1972;Dalziel et al, 1974). In the northern cratonic side of the marginal basin an Aptian-Maastrichtian succession of marine sedimentary rocks was deposited during tectonic quiescence (Biddle et al, 1986;Galeazzi, 1998); while in the southern edge of the basin a compressive regime prevailed since at least late Cretaceous .…”

Soil processes and nutrient bioavailability in the rhizosphere of Bolax gummifera in a subantarctic environment (Martial Mountains, Ushuaia—Argentina)

“…The metamorphic grade reaches the lowest facies of green schists, with appearance of minerals such as chlorite, sericite, quartz, albite and epidotite (Olivero and Martinioni, 2001). The YhFm is also intruded by basaltic rocks of tholeiitic-calc-alkaline affinities (Katz and Watters, 1966;Kranck, 1932;Quartino et al, 1989;Ian Dalziel et al, 1974;Katz, 1972).…”

The Plutón Diorítico Moat: Mildly alkaline monzonitic magmatism in the Fuegian Andes of Argentina

“…This important felsic magmatic event has been interpreted as the result of extensive melting of the continental crust (Bruhn et al, 1978;Féraud et al, 1999;Pankhurst et al, 2000;and references therein). The extensional regime eventually led to the development of the Rocas Verdes marginal basin (Katz, 1972(Katz, , 1973Dalziel et al, 1974) during Late Jurassic -Lower Cretaceous (Suárez, 1978). This resulted in the separation of a sliver of continental crust from the rest of the continent, where arc-related volcanism took place (Hardy Fm) in response to the subduction of the Pacific plate under the SW margin of Gondwana (Suárez, 1976(Suárez, , 1978Bruhn et al, 1978).…”