{"id":"CONICETDig_0ec0e7df08003fb13fc43eebbe1c10e9","dc:title":"Datos de qu\u00edmica mineral granitoides permicos \u00e1rea Valcheta","dc:creator":"Lopez, Monica Graciela","dc:date":"2024","dc:description":["We present the first geochronologically constrained igneous stratigraphy of the Permian to Early Triassic magmatism of the Nahuel Niyeu and Yaminu\u00e9 areas, northern Patagonia. This magmatism was separated into the Early Permian Granitoids (>270 Ma, EPG; Navarrete Plutonic Complex) and the Late Permian-Early Triassic Granitoids (260-245 Ma, LPETG) that are made of the Madsen Tonalite ( \u0334252 Ma, MT), Yaminu\u00e9 Metaigneous Complex ( \u0334261-249 Ma, YMIC), the Ramos Mex\u00eda Igneous Complex ( \u0334245 Ma, RMIC). Structural observations indicate that EPG are undeformed and intrude and a low-grade Ordovician metamorphic basement. LPETG are either mostly undeformed granitoids intruding Cambrian mylonites, i.e. MT or a low-grade Ordovician metamorphic basement i.e. RMIC or they are synkinematic sheeted intrusion (YMIC) concordantly emplaced in Devonian medium grade metaclastic rocks. The EPG are high Ba-Sr granitoids with 66-73% SiO2, K2O\/Na2O<1, and Sr\/Y>34. Major element chemistry indicates mafic sources and volcanic-arc affinities. Average pressure constrains their emplacement at 2.9 \u00b1 0.5 kbar. The LPETG have a wide range of compositions. From sheeted \u033462 to 75% SiO2 tonalites, to leucogranites (YMIC) to undeformed \u033460-72% tonalites to monzogranites (MT and RMIC). They show low to moderate Ba-Sr, 0.5<K2O\/Na2O<2.8 and Sr\/Y <50. Mafic to intermediate crustal sources are inferred for the LPETG. In contrast with the EPG, the YMIC was emplaced 5.2 \u00b1 0.3 Kbar. Calculated average pressure of RMIC is 2.8 \u00b1 0.25 Kbar. Since RMIC intrudes YMIC, we conclude that there was uplift of ca. 9 km between \u0334249 and 245 Ma. The major compressional event (Dn+1) that controlled the synkinematic emplacement of the YMIC is bracketed between 261 and 249 Ma. Tectonic processes associated with the uplift of YMIC from 20 to 11 Km-depth and the coeval emplacement of RMIC at 245 \u00b1 1 Ma could correspond to the collapse of a thickened crust."],"dc:format":["application\/vnd.openxmlformats-officedocument.spreadsheetml.sheet"],"dc:language":["eng"],"dc:type":"dataset","dc:rights":["info:eu-repo\/semantics\/openAccess","https:\/\/creativecommons.org\/licenses\/by-nc-sa\/2.5\/ar\/"],"dc:relation":["info:eu-repo\/grantAgreement\/Ministerio de Ciencia. Tecnolog\u00eda e Innovaci\u00f3n Productiva. Agencia Nacional de Promoci\u00f3n Cient\u00edfica y Tecnol\u00f3gica\/PICT 2016-2188","info:eu-repo\/grantAgreement\/\/PICT 2016-2188"],"dc:identifier":"https:\/\/repositoriosdigitales.mincyt.gob.ar\/vufind\/Record\/CONICETDig_0ec0e7df08003fb13fc43eebbe1c10e9"}