The Late Paleozoic Tectonometamorphic Evolution of Patagonia Revisited: Insights From the Pressure‐Temperature‐Deformation‐Time (P‐T‐D‐t) Path of the Gondwanide Basement of the North Patagonian Cordillera (Argentina)

Oriolo, Sebastián; Schulz, Bernhard; González, Pablo Diego; Bechis, Florencia; Olaizola, Ezequiel; Krause, Joachim; Renda, Emiliano Manuel; Vizán, Haroldo

doi:10.1029/2018tc005358

Cited by 39 publications

(51 citation statements)

References 114 publications

(262 reference statements)

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“…Several works have indicated the presence of an active continental margin along the western North Patagonian Massif, associated with a major deformation belt (Pankhurst et al, 2006;Ramos, 2008;Varela et al, 2015;Prezzi et al, 2018;Vizán et al, 2017). The ~NW-SE magmatic and solid-state structures found in syntectonic Paleozoic granitoids coincide with the ~NE-SW tectonic shortening proposed for Late Paleozoic times in different sectors of this deformation belt (Cerredo and Lopez de Luchi, 1998;Giacosa et al, 2004;von Gosen, 2008;Oriolo et al, 2019). In addition, Renda (pers.comm.)…”

Section: Paleozoic Scenario In Northwestern Patagoniasupporting

confidence: 73%

“…We have found a general NW-SE structural trend in the internal fabric of Paleozoic granitoids (Figs. 5 and 6), which coincides with the orientation of the foliation in metamorphic host rocks (Dalla Salda, et al, 1994;Giacosa et al, 2004;Cerredo and Lopez de Lucchi, 1998;von Gosen and Loske, 2004;von Gosen, 2008;Zaffarana et al, 2010;Oriolo et al, 2019). This structural fabric found in different syntectonic plutonic bodies is defined by magmatic and solidstate processes which indicate regional deformation conditions operating during emplacement (Paterson et al, 1989).…”

Section: J O U R N a L P R E -P R O O Fsupporting

confidence: 61%

“…Late Permian I-and S-type granites, granodiorites and tonalites (Pankhurst et al, 2006;Varela et al, 2005;, associated with the Cushamen and Colohuincul formations (Dalla Salda et al, 1994;Cerredo and López de Luchi, 1998;Giacosa et al, 2004; García-J o u r n a l P r e -p r o o f Sansegundo et al, 2009;Oriolo et al, 2019). Drill cores in the San Jorge basin revealed the presence of granitoids with K-Ar Carboniferous ages (see Fig.…”

Section: Geochronological and Geochemical Data Indicate The Presence mentioning

confidence: 98%

“…Detrital maximum sedimentation ages are from Hervé et al (2005) and zircon overgrowths of the El Maiten Gneiss are from Pankhurst et al (2006). Monazite Th-U-Pb ages are from Martinez et al (2012) and Oriolo et al (2019). Geochronological data is available at supplementary material (Table S2).…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

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Inherited basement structures and their influence in foreland evolution: A case study in Central Patagonia, Argentina

et al. 2019

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Section: Paleozoic Scenario In Northwestern Patagoniasupporting

confidence: 73%

Section: J O U R N a L P R E -P R O O Fsupporting

confidence: 61%

Section: Geochronological and Geochemical Data Indicate The Presence mentioning

confidence: 98%

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

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Inherited basement structures and their influence in foreland evolution: A case study in Central Patagonia, Argentina

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“…(f,g) Aggregated monazite grains. The aggregated character can be recognized by irregular and sutured grain boundaries, the clumped small domains with different Th contents, and the numerous small inclusions (Oriolo et al, 2019). (h) Monazite rimming apatite (Ap) grains and forming a net-like aggregation in a micaschist from the Lower Unit in the Münchberg Nappe, Saxothuringian Zone.…”

Section: Inclusions Of Monazitementioning

confidence: 99%

Monazite Microstructures and Their Interpretation in Petrochronology

Schulz

2021

Front. Earth Sci.

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The phosphate mineral monazite (LREE,Y,Th,Ca,Si)PO4 occurs as an accessory phase in peraluminous granites and Ca-poor meta-psammopelites. Due to negligible common Pb and very low Pb diffusion rates at high temperatures, monazite has received increasing attention in geochronology. As the monazite grain sizes are mostly below 100 μm in upper greenschist to amphibolite facies meta-psammopelites, and rarely exceed 250 μm in granulite facies gneisses and in migmatites, microstructural observation and mineral chemical analysis need the investigation by scanning electron microscope and electron probe microanalyzer, with related routines of automated mineralogy. Not only the microstructural positions, sizes and contours of the grains, but also their internal structures in backscattered electron imaging gray tones, mainly controlled by the Th contents, can be assessed by this approach. Monazite crystallizes mostly euhedral to anhedral with more or less rounded crystal corners. There are transitions from elliptical over amoeboid to strongly emarginated grain shapes. The internal structures of the grains range from single to complex concentric over systematic oszillatory zonations to turbulent and cloudy, all with low to high contrast in backscattered electron imaging gray tones. Fluid-mediated partial alteration and coupled dissolution-reprecipitation can lead to Th-poor and Th-rich rim zones with sharp concave boundaries extending to the interior. Of particular interest is the corona structure with monazite surrounded by apatite and allanite, which is interpreted to result from a replacement during retrogression. The satellite structure with an atoll-like arrangement of small monazites may indicate re-heating after retrogression. Cluster structures with numerous small monazite grains, various aggregation structures and coating suggest nucleation and growth along heating or/and enhanced fluid activity. Microstructures of monazite fluid-mediated alteration, decomposition and replacement are strongly sutured grain boundaries and sponge-like porosity and intergrowth with apatite. Garnet-bearing assemblages allow an independent reconstruction of the pressure-temperature evolution in monazite-bearing meta-psammopelites. This provides additional potential for evaluation of the monazite microstructures, mineral chemistry and Th-U-Pb ages in terms of clockwise and counterclockwise pressure-temperature-time-deformation paths of anatectic melting, metamorphism and polymetamorphism. That way, monazite microstructures serve as unique indicators of tectonic and geodynamic scenarios.

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The low-grade basement at Península La Carmela, Chilean Patagonia: new data for unraveling the pre-Permian basin nature of the Eastern Andean Metamorphic Complex

Rojo

Calderón

Ghiglione

et al. 2021

Int J Earth Sci (Geol Rundsch)

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The Eastern Andean Metamorphic Complex at Península La Carmela (48°50'S) consists of quartz-rich metaturbiditic sequences with tectonic slices of pillow metabasalt bodies deformed under low-grade metamorphic conditions. Previous and new detrital zircon U-Pb geochronological data from metasandstones indicate a preferred early Carboniferous maximum depositional age of the protolith, interpreted from the youngest single zircon grains of several metasedimentary rocks in the area. The wide spectrum of zircon ages from Península La Carmela, includes Neoproterozoic-early Paleozoic components and subordinate ancient zircon grains (> 2200 Ma). They were sourced from cratonic regions and/or reworked material from older metasedimentary successions and plutonic belts in southwestern Gondwana (e.g., North Patagonian and Deseado massifs or from the Tierra del Fuego Igneous and Metamorphic Complex). The pillow metabasalts have geochemical affinities of normal mid-oceanic ridge basalts and island-arc tholeiites with Nb-Ta negative anomalies, derived from a depleted mantle source (εNd t of + 6 and + 7.5). In consideration that pillow metabasalts with ocean island basalt affinities are reported, we propose that metaturbiditic successions and metabasalts were tectonically juxtaposed within a pre-Permian accretionary wedge of an active continental margin, after the development of island arcs and back-arc marginal basins.

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The Late Paleozoic Tectonometamorphic Evolution of Patagonia Revisited: Insights From the Pressure‐Temperature‐Deformation‐Time (P‐T‐D‐t) Path of the Gondwanide Basement of the North Patagonian Cordillera (Argentina)

Cited by 39 publications

References 114 publications

Inherited basement structures and their influence in foreland evolution: A case study in Central Patagonia, Argentina

Inherited basement structures and their influence in foreland evolution: A case study in Central Patagonia, Argentina

Monazite Microstructures and Their Interpretation in Petrochronology

The low-grade basement at Península La Carmela, Chilean Patagonia: new data for unraveling the pre-Permian basin nature of the Eastern Andean Metamorphic Complex

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