Evolution of the Carboniferous-Early Cretaceous units of Paraná Basin from provenance studies based on U-Pb, Hf and O isotopes from detrital zircons

Tracking voluminous Permian volcanism of the Choiyoi Province into central Antarctica

“…Recent work has utilized zircon geochronology and geochemistry to unlock the history of Permian magmatism and volcanism in southwestern Gondwana contemporaneous with the Choiyoi Province. U-Pb ages and Hf isotopes of detrital zircon within volcaniclastic rocks from the Paraná Basin are reported to be temporally and geochemically comparable to the Choiyoi Province (Canile et al, 2016). Similarly, Fanning et al (2011) and Castillo et al (2016) utilized zircon Hf-O isotopes to demonstrate a correlation in Permian detrital zircon Hf isotope compositions between the Antarctic Peninsula, Patagonia, and the Choiyoi Province.…”

“…The source of widespread Permian distal volcanic deposits and detrital zircon within the proto-Weddell Sea region is generally considered to be the outboard active continental paleo-Pacific margin of Gondwana, including the Choiyoi Province ( Fig. 1; Sato et al, 2015;Canile et al, 2016;Elliot et al, 2016). However, this segment of the Gondwana margin has been highly fragmented due to supercontinent breakup in the Jurassic through Cretaceous and, consequently, reconstructing the prebreakup arrangement of the various crustal blocks has been considered the "problem child" of paleo-Pacific margin tectonics (Dalziel and Elliot, 1982;Grunow et al, 1987;Storey et al, 1988).…”

“…For these reasons, potential sources of Permian-aged detrital zircon in volcanogenic sediments in the Paraná Basin, southern Patagonia, West Antarctica, and South Africa have been limited to abundant Permian subduction-related magmatic and volcanic rocks of the Choiyoi Province, or sparse occurrences of subduction-related Permian granites in the crustal blocks of West Antarctica (e.g., Antarctic Peninsula, Marie Byrd Land, Thurston Island; Fig. 2) (Canile et al, 2016;Castillo et al, 2016;Fanning et al, 2011;Elliot et al, 2016Elliot et al, , 2017McKay et al, 2016). The Choiyoi Province (Fig.…”

“…Constraints on the timing and geochemistry of regional Permian volcanism in the proto-Weddell Sea segment of the paleo-Pacific margin (Fig. 1) have been greatly improved by the application of zircon geochronology and geochemistry (i.e., petrochronology) in detrital studies of volcanoclastic sediments (Canile et al, 2016;McKay et al, 2016;Nelson and Cottle, 2017;Fanning et al, 2011;Castillo et al, 2016;Kylander-Clark, 2017). In particular, detrital zircon U-Pb geochronology and Hf isotopic investigations of sedimentary rocks from the Paraná Basin and accretionary complexes of the Antarctic Peninsula and Patagonia (Fig.…”

“…In particular, detrital zircon U-Pb geochronology and Hf isotopic investigations of sedimentary rocks from the Paraná Basin and accretionary complexes of the Antarctic Peninsula and Patagonia (Fig. 1) have identified Permian volcanic detritus that may been directly sourced from the Choiyoi Province or correlative continental arc magmatism (Canile et al, 2016;Castillo et al, 2016;Fanning et al, 2011). In contrast, distal volcanic deposits in the Karoo Basin of South Africa (Fig.…”