Across-arc variation of the Famatinian magmatic arc (NW Argentina) exemplified by I-, S- and transitional I/S-type Early Ordovician granitoids of the Sierra de Velasco

Grosse, Pablo; Bellos, Laura Iudith; Hoyos, Camilo R. de los; Larrovere, Mariano A.; Rossi, Juana N.; Toselli, Alejandro J.

doi:10.1016/j.jsames.2011.03.014

Cited by 59 publications

(34 citation statements)

References 80 publications

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“…Spider diagrams (normalized to primitive mantle) of the Malaysian granitoids ( Fig. 12) were created to compare the trace element geochemistry of the Malaysian granitoids with that of more typical Cordilleran I-and S-type granites, such as the Famatinian magmatic arc in northwestern Argentina (Grosse et al, 2011), and the A-type granites of northeastern China (Wu et al, 2002). These spider diagrams show that the Malaysian granitoids are more enriched in HFSEs (e.g., Zr, Nb, and rare earth elements [REEs]) than typical Cordilleran I-and S-type granites.…”

Section: Comparison Between Malaysian Granitoids and Cordilleran I-anmentioning

confidence: 99%

“…Since Chappell and White's (1974) landmark paper describing two contrasting granite types in the Australian Lachlan fold belt, the I-and S-type classifi cation system has been applied to many granitic terranes, which include the Malaysian granitoids and the Andean-Cor dilleran chain (Beckinsale, 1979;Grosse et al, 2011). Chappell and White (1974) described the granites formed by igneous-sourced melt as "I type", and those formed from sedimentarysourced melt as "S type".…”

Section: Introductionmentioning

confidence: 99%

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Petrogenesis of Malaysian granitoids in the Southeast Asian tin belt: Part 1. Geochemical and Sr-Nd isotopic characteristics

Chung

Robb

et al. 2015

Geological Society of America Bulletin

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The Malaysian granitoids of the Southeast Asian tin belt have been traditionally divided into a Permian to Late Triassic "I-type"dominated arc-related Eastern province (Indochina terrane) and a Late Triassic "S-type"-dominated collision-related MainRange province (Sibumasu terrane), separated by the Bentong-Raub Paleo-Tethyan suture that closed in the Late Triassic. The present study, however, shows that this model is oversimplifi ed and that the direct application of Chappell and White's (1974) I-and S-type classifi cation cannot account for many of the characteristics shared by Malaysian granitoids. Despite being commonly hornblende bearing, as is typical for I-type granites, the roof zones of the Eastern province granites are hornblende free. In addi tion, the Main Range province granitoids contain insignifi cant primary muscovite, and are dominated by biotite granites, mineralogically similar to many of the plutons of the Eastern province. In general, the Malaysian granitoids from both provinces are more enriched in high fi eld strength elements than typical Cordilleran I-and S-type granitoids. The mineralogy and geochemistry of the Eastern province granitoids, and their relationship with contemporaneous volcanics, confi rm their I-type nature. The bulk liquid lines of descent of both granitic provinces largely overlap with one another. Sr-Nd isotopic data further demonstrate that the Malaysian granitoids, especially those of the Main Range, were hybridized melts derived from two "end-member" source regions, one of which is isotopically similar to the Kontum orthoamphibolites and the other akin to the Kontum paragneisses of the Indochina block. However, there are differences in the source rocks for the two provinces, and it is suggested in this paper that these are related to differing proportions of igneous and sedimentary protoliths. The incorporation of sedimentary-sourced melts in the Eastern province is insignifi cant, which allowed the granites in this belt to maintain their I-type nature. The presence of minor primary tin mineralization in the Eastern province compared to the much more signifi cant tin endowment in the Main Range is considered to refl ect the incorporation of a smaller proportion of sedimentary protolith in the melt products of the former.

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Section: Comparison Between Malaysian Granitoids and Cordilleran I-anmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Petrogenesis of Malaysian granitoids in the Southeast Asian tin belt: Part 1. Geochemical and Sr-Nd isotopic characteristics

Chung

Robb

et al. 2015

Geological Society of America Bulletin

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“…The three associations were emplaced within the interval 484-463 Ma. Detailed petrological, geochemical and isotope studies have been carried out by Rapela et al (1990), Aceñolaza et al (1996), Saavedra et al (1998), Pankhurst et al (1998Pankhurst et al ( , 2000, Dahlquist and Galindo (2004), Miller and Söllner (2005), Dahlquist et al (2008;, Ducea et al (2010), Grosse et al (2011), Otamendi et al (2009, 2012, and Castro et al (2013). I-type intrusions ranging from gabbro to monzogranite (tonalite and granodiorite are dominant) have εNdt values of −3 to −9 implying some crustal contribution to the magmas.…”

Section: *Manuscript Click Here To Download Manuscript: Manuscrite_almentioning

confidence: 99%

The evolution of a mid-crustal thermal aureole at Cerro Toro, Sierra de Famatina, NW Argentina

Alasino¹,

Casquet²,

Larrovere³

et al. 2014

Lithos

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A sheeted tonalite complex at Cerro Toro in western Sierra de Famatina, Argentina, was emplaced in the middle crust during an early phase of the Ordovician Famatinian orogeny. The intrusion produced a large-scale thermal aureole that provoked significant melting of the host rocks and hybridization of the anatectic melts with the tonalitic magmas. Three zones were distinguished in a cross-section: (1) an external zone consisting of metatexitic gneisses, amphibolites and minor tonalites, (2) an intermediate zone formed by screens of highly melted gneisses and amphibolites lying between the tonalite sheets: stoped blocks of gneisses within the tonalite sheets, small bodies of metagabbro and hybrid rocks are common in this zone, (3) an internal zone formed almost exclusively of massive tonalite. Incongruent melting of biotite in gneisses of the intermediate zone produced abundant cordierite and garnet; anatectic granitoids developed in the innermost part at 750-800ºC and ca. 5kbar. High water activities within this zone eventually promoted significant melting of plagioclase + quartz in the gneisses. Pooling of anatectic magmas resulted in allochthonous bodies of variable size either concordant or discordant to the regional structural grain, and part were retained in or close to the residuum. Allochthonous granitoids did not reach isotopic equilibrium with the source protolith probably due to fast extraction of the melts. The Cerro Toro contact aureole shows that assimilation of metasedimentary rocks through partial melting can be an important mechanism during emplacement of tonalitic magmas at middle crust levels. Thus the chemistry of cordilleran magma can be modified as they rise through the crust. AbstractA sheeted tonalite complex at Cerro Toro in western Sierra de Famatina, Argentina, was emplaced in the middle crust during an early phase of the Ordovician Famatinian orogeny. The intrusion produced a large-scale thermal aureole that provoked significant melting of the host rocks and hybridization of the anatectic melts with the tonalitic magmas. Three zones were distinguished in a cross-section: (1) an external zone consisting of metatexitic gneisses, amphibolites and minor tonalites, (2) an intermediate zone formed by screens of highly melted gneisses and amphibolites lying between the tonalite sheets: stoped blocks of gneisses within the tonalite sheets, small bodies of metagabbro and hybrid rocks are common in this zone, (3) an internal zone formed almost exclusively of massive tonalite. Incongruent melting of biotite in gneisses of the intermediate zone produced abundant cordierite and garnet; anatectic granitoids developed in the innermost part at 750-800ºC and ca. 5kbar. High water activities within this zone eventually promoted significant melting of plagioclase + quartz in the gneisses. Pooling of anatectic magmas resulted in allochthonous bodies of variable size either concordant or discordant to the regional structural grain, and part were retained in or close to the residuum. Allochthonou...

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“…However, none of these previous studies have Two pulses of magmatism are found in the Velasco range, Ordovician and Lower Carboniferous (Pankhurst et al, 2000;Toselli et al, 2007;Dahlquist et al, 2013). The Ordovician magmatic episode, linked to the Famatinian magmatic arc (e.g., Pankhurst et al, 1998), originated peraluminous S-type porphyritic granitoids on the northwestern and western flanks of the Velasco range, and metaluminous to weakly peraluminous I-type granodiorites and tonalites on the southern portion of the range (Bellos, 2005;Rossi et al, 2005a;Grosse et al, 2011;Bellos et al, 2015). The Ordovician granitoids were affected by dynamic metamorphism that generated NNW-SSE-trending ductile shear zones of regional extension.…”

Section: Introductionmentioning

confidence: 97%

Internal framework and geochemistry of the Carboniferous Huaco granite pluton, Sierra de Velasco, NW Argentina

Sardi

Grosse

Murata

et al. 2018

andgeo

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ABSTRACT. The A-type Huaco granite pluton of the Velasco range (Sierras Pampeanas of northwest Argentina) is formed by three coeval granitic facies and contains subordinate coeval-to-late facies, as well as enclaves, dikes and stocks that show different temporal relations, textures and compositions. The dominant facies (Regional Porphyritic Granite; RPG) is a porphyritic two-mica monzo-to syenogranite, with abundant microcline megacrysts up to 12 cm in size. It was emplaced in a dominant extensional setting and has a mainly crustal source but with participation of a mantle-derived component. The RPG transitions towards two coeval and co-genetic granite facies, at its margins (Border Granite; BG) and around Be-pegmatites (Adjacent Porphyritic Granite; APG). These two facies have a finer-grained texture and smaller and less abundant megacrysts. They are also monzo-to syenogranites, but a slight decrease in the biotite/muscovite ratio is observed from the BG to the RPG to the APG. Trace element modeling suggests that the RPG, BG and APG differentiated from the same magma source by fractional crystallization. Temporally older mafic (ME) and felsic (FE) enclaves are common in the pluton. The ME can be considered partially assimilated remnants of a mafic component in the genesis of the RPG, whereas the FE seem to be remnants of premature aplites. Other subordinate rocks intrude the RPG and are, hence, temporally younger: felsic dikes (FD), dioritic dikes (DD) and equiganular granites (EqG) are clearly posterior, whereas coeval-to-late Be-pegmatites (BeP) and orbicular granites (OG) formed during the final stages of crystallization of the pluton. The BeP, OG and FD indicate the presence of abundant water and volatiles. The EqG form small stocks that intrude the RPG and were possibly originated from purely crustal sources. The DD probably correspond to a younger unrelated episode of mafic magmatism. Keywords: Granitic facies, REE and LIL composition,Fractional crystallization model, Huaco granite, Velasco range, Sierras Pampeanas.RESUMEN. Estructura interna y geoquímica del plutón granítico carbonífero de Huaco, Sierra de Velasco, NW de Argentina. El Plutón Huaco, ubicado en la sierra de Velasco (en Sierras Pampeanas del noroeste de Argentina), es de afinidad granítica A y está conformado por tres facies graníticas y contiene varias rocas ígneas subordinadas, las que muestran diferentes relaciones temporales, texturas y composiciones. La facies granítica dominante (Granito Porfírico Regional; RPG) es un monzo-sienogranito de dos micas, de textura porfírica con abundantes megacristales de microclino que pueden alcanzar hasta 12 cm de longitud. Ha sido emplazado en un marco tectónico dominantemente extensional y habría tenido una fuente de origen cortical pero también con participación de componentes mantélicos. En los bordes del Plutón Huaco y envolviendo a pegmatitas de berilo contenidas en el mismo (BeP), se reconocen las facies cogenéticas BG y APG respectivamente, las cuales tienen contacto transicional con el RPG. E...

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Across-arc variation of the Famatinian magmatic arc (NW Argentina) exemplified by I-, S- and transitional I/S-type Early Ordovician granitoids of the Sierra de Velasco

Cited by 59 publications

References 80 publications

Petrogenesis of Malaysian granitoids in the Southeast Asian tin belt: Part 1. Geochemical and Sr-Nd isotopic characteristics

Petrogenesis of Malaysian granitoids in the Southeast Asian tin belt: Part 1. Geochemical and Sr-Nd isotopic characteristics

The evolution of a mid-crustal thermal aureole at Cerro Toro, Sierra de Famatina, NW Argentina

Internal framework and geochemistry of the Carboniferous Huaco granite pluton, Sierra de Velasco, NW Argentina

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