Detrital zircon U–Pb ages of metasedimentary rocks from Sierra de Valle Fértil: Entrapment of Middle and Late Cambrian marine successions in the deep roots of the Early Ordovician Famatinian arc

Cristofolini, Eber A.; Otamendi, Juan E.; Ducea, Mihai N.; Pearson, David; Tibaldi, A; Baliani, Ignacio

doi:10.1016/j.jsames.2012.02.001

Cited by 39 publications

(34 citation statements)

References 60 publications

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“…A possible source for these fluids is through the progressive metamorphism of the country-rocks (by devolatilization reactions from R1 to R5), considering that the Famatinian orogen was dominated by fertile protoliths without pre-Ordovician metamorphism (Casquet et al, 2012b;Cristofolini et al, 2012).…”

Section: Did Anatexis Results From Mica Dehydration-melting Reactions mentioning

confidence: 99%

“…This accretionary-type orogeny overprinted all pre-Ordovician terranes along the southwestern Gondwana margin between latitudes 20°S and 40°S. The Famatinian belt is widely accepted as having formed on continental crust (Pankhurst et al, 1998;Dahlquist and Galindo, 2004;Miller and Söllner, 2005;Otamendi et al, 2012;Dahlquist et al, 2013). Pankhurst et al (2000) identified three distinct Famatinian granitoid-associations: 1) dominant I-type, 2) S-type, and 3) smallscale tonalite-trondhjemite-granodiorite (TTG) type.…”

Section: *Manuscript Click Here To Download Manuscript: Manuscrite_almentioning

confidence: 94%

“…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. Only a few Famatinian igneous rocks have positive values of εNdt, such as a few gabbros in the Sierra de Valle Fértil (εNdt = +0.25, +0.9, n=2, Otamendi et al, 2009Otamendi et al, , 2012, subordinate Na-rich granites of the TTG associations in the Pampean foreland (εNdt = +1.6 to −0. 2, Pankhurst et al, 2000) and amphibolites (metabasaltic dykes) of the Loma de Las Chacras (εNdt = +1.8 to +4.8, Casquet et al, 2012a), suggesting more primitive input to Famatinian magmatism.…”

Section: *Manuscript Click Here To Download Manuscript: Manuscrite_almentioning

confidence: 99%

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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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Section: Did Anatexis Results From Mica Dehydration-melting Reactions mentioning

confidence: 99%

Section: *Manuscript Click Here To Download Manuscript: Manuscrite_almentioning

confidence: 94%

Section: *Manuscript Click Here To Download Manuscript: Manuscrite_almentioning

confidence: 99%

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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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“…However, the partial detrital zircon age pattern (Fig. 2C) shows similarities with those of the Sierra de Valle H~rtil migmatites that host the VFPS (Casquet et al, 2011;Cristofolini et al, 2012 ). The migmatite protolithswere laid down in the Middle to Late Cambrian before the onset of the Famatinian orogeny and contain a population of Early Cambrian, Neoproterozoic and Mesoproterozoic zircon grains.…”

mentioning

confidence: 78%

“…This evidence, along with the presence in SVF-709 of a population of detrital igneous zircons derived from Famatinian igneous rocks, suggests that provenance of zircon grains to the forearc basin was from the east, i.e., from the erosion of the VFPS and its host Middle to Late Cambrian sedimentary rocks. Remarkably, however, zircons with early Cambrian "Pampean" ages between 530 and 510 Ma that constitute the main population in metasedimentary rocks of the SVF (Cristofolini et al, 2012 ) are not so far recorded in SVF-709.…”

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confidence: 99%

Fast sediment underplating and essentially coeval juvenile magmatism in the Ordovician margin of Gondwana, Western Sierras Pampeanas, Argentina

et al. 2012

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Keywords:Famatinian magmatic arc Juvenile magmatismMetasedimentary high-pressure upper amphibolite fades gneisses (1.2 ± 0.1 ePa and 780± 45 QC) at Las Chacras, Sierra de Valle Fertil, are tectonically juxtaposed to thewesternmost parts (outboard) of the Famatinian (Early Ordovician) magmatic arc, which underwent syn-plutonic middle crust high-grade metamorphism at lower pressure. U-Pb SHRIMP zircon data suggest that the gneisses contain Famatinian igneous detritus, so that their sedimentary protoliths were probably deposited in a forearc basin and then rapidly underthrust and accreted to the lower crust of the arc, essentiallycoevallywith arc magmatism at468 ± 4 Ma Chemically and isotopically juvenile garnetiferous amphibolites within the gneisses are recognised as representing the most primitive magmas so far obselVed in this belt, which has often been considered to be a continental arc derived from isotopically mature sources. This is consistent with the idea that at least part of the dominant Famatinian magmatism originated in depleted mantle but was heavily contaminated by crustal components. U-Pb SHRIMP zircon geochronology Gondwana Sierras Pampeanas

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Sediment underthrusting within a continental magmatic arc: Coast Mountains batholith, British Columbia

et al. 2017

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Though continental magmatic arcs are factories for new continental crust, a significant proportion of continental arc magmas are recycled from supracrustal material. To evaluate the relative contributions of retroarc underthrusting and trench side partial sediment subduction for introducing supracrustal rocks to the middle and lower crust of continental magmatic arcs, we present results from the deeply exposed country rocks of the Coast Mountains batholith of western British Columbia. Prior work demonstrates that these rocks underwent widespread partial melting that contributed to the Coast Mountains batholith. We utilize U‐Pb zircon geochronology, Sm‐Nd thermochronology, and field‐based studies to document the protoliths and early burial history of amphibolite and granulite‐facies metasedimentary rocks in the Central Gneiss Complex. U‐Pb detrital zircon data from the structurally highest sample localities yielded ~190 Ma unimodal age peaks and suggest that retroarc rocks of the Stikine terrane constitute a substantial portion of the Central Gneiss Complex. These supracrustal rocks underwent thrust‐related burial and metamorphism at >25 km depths prior to ~80 Ma. These rocks may also be underlain at the deepest exposed structural levels by Upper Cretaceous metasedimentary rocks, which may have been emplaced as a result of trench side underplating or intraarc burial. These results further our understanding of the mechanisms of material transport within the continental lithosphere along Cordilleran subduction margins.

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Detrital zircon U–Pb ages of metasedimentary rocks from Sierra de Valle Fértil: Entrapment of Middle and Late Cambrian marine successions in the deep roots of the Early Ordovician Famatinian arc

Cited by 39 publications

References 60 publications

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

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

Fast sediment underplating and essentially coeval juvenile magmatism in the Ordovician margin of Gondwana, Western Sierras Pampeanas, Argentina

Sediment underthrusting within a continental magmatic arc: Coast Mountains batholith, British Columbia

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