Geochronology and geochemistry of the Tabaquito batholith (Frontal Cordillera, Argentina): geodynamic implications and temporal correlations in the SW Gondwana margin

Author(s)

Moreno, Juan A. ^[1] ; Dahlquist, Juan A. ^[1] ; Morales Camera, Matias M. ^[1] ; Alasino, Pablo H. ^{[2, 3]} ; Larrovere, Mariano A. ^{[2, 3]} ; Basei, Miguel A. S. ^[4] ; Galindo, Carmen ^[5] ; Zandomeni, Priscila S. ^[1] ; Rocher, Sebastian ^{[2, 3]}

Affiliation

^[1] Univ Nacl Cordoba, Fac Ciencias Exactas Fis & Nat, Consejo Nacl Invest Cient & Tecn, Ctr Invest Ciencias Tierra CICTERRA, Av Velez Sarsfield 1611, Edificio CICTERRA, Cordoba - Argentina

^[2] UNCa, CONICET, Ctr Reg Invest Cient & Transferencia Tecnol La Ri, Prov La Rioja, UNLaR, SEGEMAR, Entre Rios & Mendoza S-N, RA-5301 Anillaco - Argentina

^[3] Univ Nacl La Rioja, Ctr Invest & Innovac Tecnol, Inst Geol & Recursos Nat, INGeReN, CENIIT, UNLaR, Av Gob Vernet & Apostol Felipe, RA-5300 La Rioja - Argentina

^[4] Univ Sao Paulo, Inst Geociencias, RAU Lago 562, BR-05508080 Sao Paulo, SP - Brazil

^[5] Univ Complutense, Fac Ciencias Geol, Dept Mineral & Petrol, Inst Geociencias IGEO, CSIC, Madrid 28040 - Spain

• Document type: Journal article
• Source: JOURNAL OF THE GEOLOGICAL SOCIETY; v. 177, n. 3, p. 455-474, MAY 2020.
• Web of Science Citations: 0

Abstract

The Tabaquito batholith (Frontal Cordillera, western Argentina), is mainly composed of shallowly emplaced granodiorite to minor monzogranite with abundant mafic microgranular enclaves. New sensitive high-resolution ion microprobe U-Pb zircon ages of c. 337 Ma (biotite granodiorite) and c. 284 Ma (mafic dyke) along with previously published geochronological data suggest that a long-lived magmatic system formed through at least two magmatic pulses at c. 337 and c. 322 Ma with later superimposition of Permian magmatism. The Tabaquito granitoids are metaluminous, calc-alkalic and magnesian with I-type affinity. Elevated Th/Nb, Y/Nb and La/Nb ratios along with negative Nb-Ta and positive Pb anomalies are consistent with a continental arc setting. Hf, Nd and Sr isotopic composition of the Tabaquito granitoids suggests that their source could result from mixing of an old felsic crustal component and a juvenile mafic to intermediate component. New geochronological and geochemical data together with published data reveal a continuous arc setting from the Carboniferous to the Permian in Argentina, and important magmatic compositional variations through time and space controlled by episodic fluctuations in the subduction angle of the oceanic plate. Reported and compiled data allow us to infer the continuity of the Carboniferous magmatic arc along the west margin of Gondwana. (AU)

• FAPESP's process: 18/06837-3 - U-Pb zircon geochronology and HF data from magmatic zircon in devonian-carboniferous granites as monitors of crustal growth and geodynamic setting, pre-andean continental margin of SW Gondwana
• Grantee: Miguel Angelo Stipp Basei
• Support Opportunities: Research Grants - Visiting Researcher Grant - International