Contrasting tectonic settings in Northern Chon Aike Igneous Province of Patagonia: subduction and mantle plume-related volcanism in the Marifil formation

Pivetta, Cecilia Mariana Pavon; Gregori, Daniel Alfredo; Benedini, Leonardo; Garrido, Mirta M.; Strazzere, Leonardo; Geraldes, Mauro César; Santos, Anderson Costa dos; Marcos, Paulo

doi:10.1080/00206814.2019.1669227

Cited by 18 publications

(9 citation statements)

References 57 publications

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“…2000;Strazzere et al . 2017;Pavón Pivetta et al 2019Gordon and Ort, 1994, Rapela et al . 2005 Compound massive lapilli tuff (ignimbrite) units (FA 7a) interbedded w ith fines rich sedimentary deposits (FA 4).…”

Section: -The Early Jurassic Volcanism Of Central Patagonia Forms An Extensivementioning

confidence: 99%

Lower Jurassic felsic diatreme volcanism recognized in central Patagonia as evidence of along-strike rift segmentation

Benedini

Pivetta

Marcos

et al. 2021

Journal of South American Earth Sciences

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Section: -The Early Jurassic Volcanism Of Central Patagonia Forms An Extensivementioning

confidence: 99%

Lower Jurassic felsic diatreme volcanism recognized in central Patagonia as evidence of along-strike rift segmentation

Benedini

Pivetta

Marcos

et al. 2021

Journal of South American Earth Sciences

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“…The map shows the location of the samples with geochemical analyses from different authors which were used to make regional comparisons. Lonco Trapial Formation (Dejonghe et al, 2002;Zaffarana et al, 2018;Bouhier et al, 2017;Schiuma and Llambías, 2008), Garamilla Formation (Benedini and Gregori, 2013), Alvar Andesites (Aragón et al, 2000), the Middle Jurassic dike swarms (López De Luchi and Rapalini, 2002), Marifil Complex (Pankhurst and Rapela, 1995;Márquez et al, 2010Márquez et al, , 2011Navarrete et al, 2019 andPavón Pivetta et al, 2019), the Subcordilleran Plutonic Belt (Haller et al, 1999;Rapela et al, 2005) and Lago La Plata Formation (Echaurren et al, 2017) were the units that are discussed in this work, see the text for further explanations.…”

Section: Early-middle Jurassic Magmatism In North Patagoniamentioning

confidence: 99%

“…The obtained T DM that span from 1.056 to 1.458 Ga (average 1.3 Ga, Table 1) suggest reworking of continental crust of Mesoproterozoic age in the origin of the magmas of this central volcanic belt of northern Patagonia, as was previously pointed out by Pankhurst and Rapela (1995) for the Chon Aike Volcanic Province. Lower crustal pyroxene- (Echaurren et al, 2017), Marifil Complex (Pankhurst and Rapela, 1995;Márquez et al, 2011;Navarrete et al, 2019;Pavón Pivetta et al, 2019), Subcordilleran Plutonic Belt (Haller et al, 1999;Rapela et al, 2005) and Lonco Trapial Formation (Dejonghe et al, 2002) are included for comparison. Lines defining arc field ratios according to Kay et al (2006).…”

Section: Isotopic Composition and Assessment Of The Role Of Crustal Contaminationmentioning

confidence: 99%

“…Chondrite normalization was taken from McDonough and Sun (1995) and Primitive Mantle normalization was taken from Sun and McDonough (1989). a-d) Central domain, e-h) Eastern and central domains: Garamilla Formation and Marifil Complex (data fromPankhurst and Rapela, 1995;Márquez et al, 2010;Navarrete et al, 2019;Pavón Pivetta et al, 2019) are treated together because they are broadly alike i-l) Western domain. Squares correspond to samples from Lago La Plata Formation from this work, and diamonds fromEchaurren et al (2017).…”

mentioning

confidence: 99%

“…g) Ba/La vs. La/Ta diagram. Data from Lago La Plata Formation(Echaurren et al, 2017), Marifil Complex(Pankhurst and Rapela, 1995;Márquez et al, 2011;Navarrete et al, 2019;Pavón Pivetta et al, 2019), Subcordilleran Plutonic Belt(Haller et al, 1999;Rapela et al, 2005) and Lonco Trapial Formation(Dejonghe et al, 2002) are included for comparison. Lines defining arc field ratios according toKay et al (2006).…”

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confidence: 99%

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Petrogenetic study of the Lonco Trapial volcanism and its comparison with the Early-Middle Jurassic magmatic units from northern Patagonia

Zaffarana

Lagorio

Gallastegui

et al. 2020

Journal of South American Earth Sciences

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Identifying crustal contributions in the Patagonian Chon Aike Silicic Large Igneous Province

Foley,

Putlitz,

Baumgartner

et al. 2023

Contrib Mineral Petrol

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The volcanic rocks of the Chon Aike Silicic Large Igneous Province (CASP) are recognized as magmas dominantly produced by crustal anatexis. Investigating the zircon of the CASP provides an opportunity to gain further insight into geochemical and isotopic differences of the potential magmatic sources (i.e., crust versus mantle), to identify crustal reservoirs that contributed to the felsic magmas during anatexis, and to quantify the contributions of the respective sources. We present a combined zircon oxygen and hafnium isotope and trace element dataset for 16 volcanic units of the two youngest volcanic phases in Patagonia, dated here with LA-ICP-MS U–Pb geochronology at ca. 148–153 Ma (El Quemado Complex, EQC) and ca. 159 Ma (western Chon Aike Formation, WCA). The EQC zircon have 18O-enriched values (δ18O from 7 to 9.5‰) with correspondingly negative initial εHf values (− 2.0 to − 8.0). The WCA zircon have δ18O values between 6 and 7‰ and εHf values ranging between − 4.0 and + 1.5. Binary δ18O-εHf mixing models require an average of 70 and 60% melt derived from partial melting of isotopically distinct metasedimentary basements for the EQC and WCA, respectively. Zircon trace element compositions are consistent with anatexis of sedimentary protoliths derived from LIL-depleted upper continental crustal sources. The overlap between a high heat flux environment (i.e., widespread extension and lithospheric thinning) during supercontinental breakup and a fertile metasedimentary crust was key in producing voluminous felsic volcanism via anatexis following the injection and emplacement of basaltic magmas into the lower crust.

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Contrasting tectonic settings in Northern Chon Aike Igneous Province of Patagonia: subduction and mantle plume-related volcanism in the Marifil formation

Cited by 18 publications

References 57 publications

Lower Jurassic felsic diatreme volcanism recognized in central Patagonia as evidence of along-strike rift segmentation

Lower Jurassic felsic diatreme volcanism recognized in central Patagonia as evidence of along-strike rift segmentation

Petrogenetic study of the Lonco Trapial volcanism and its comparison with the Early-Middle Jurassic magmatic units from northern Patagonia

Identifying crustal contributions in the Patagonian Chon Aike Silicic Large Igneous Province

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