Puncoviscana folded belt in northwestern Argentina: testimony of Late Proterozoic Rodinia fragmentation and pre-Gondwana collisional episodes

Omarini, R.; Sureda, Ricardo J.; Götze, Hans‐Jürgen; Seilacher, Adolf; Pflüger, Friedrich

doi:10.1007/s005310050247

Cited by 102 publications

(103 citation statements)

References 79 publications

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“…Trace fossils suggest an Ediacaran to Early Lower Cambrian age (Acefiolaza and Acefiolaza, 2005). Alkaline lava flows, sills and dykes in the lower part of the section show "oceanic island" to "within-plate" signature (Coira et al , 1990), while rift-related alkaline to transitional alkaline to MORB-like basalts appear higher in the section (Omarini et al, 1999). The whole succession is tightly folded and intruded by Cambrian granites, and is unconfolTIlably overlain by the late Early Cambrian to Middle Cambrian siliciclastic sedi ments of the Mes6n Group (see Mangano and Buatois, 2004;Aceiiolaza and Aceiiolaza, 2005 for detailed references).…”

Section: The Proto-andean Palae Oz Oic and Mesoproterozoic Beltsmentioning

confidence: 99%

The Río de la Plata craton and the assembly of SW Gondwana

Rapela

Pankhurst

Casquet

et al. 2007

Earth-Science Reviews

383

357

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provenance, and derivation from the Rio de la Plata craton is highly unlikely. considerations, previously zircon data, palaeocurrent and structural data, suggest that these rocks must have had an origin within Gondwana-forming blocks, for which the closest ide ntifiable somces are 'Brazilian' and 'African' (Namaqua Natal). Consequently, the model for the orogeny is that the Rio de la which was at the time attached to the large Amazonia craton and other smaller continental blocks, such as Arequipa Antofalla and Rio Protracted relative displacement of the RPC after the Orogeny 1ed to its fina1 !-'U.>lU'UH.

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Section: The Proto-andean Palae Oz Oic and Mesoproterozoic Beltsmentioning

confidence: 99%

The Río de la Plata craton and the assembly of SW Gondwana

Rapela

Pankhurst

Casquet

et al. 2007

Earth-Science Reviews

383

357

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“…5a and b) in the northern and central Proto-Andes, and are too old to be a source of the abundant Late Neoproterozoic detrital zircon encountered on the Proto-Andean margin which is 650-550 Ma. All younger Neoproterozoic extensional magmatism on the Proto-Andean margin is primarily basic in nature (Omarini et al, 1999) and is therefore unlikely to be a significant source of zircon as zircon usually crystallizes from felsic-intermediate magmas (e.g. Hoskin and Schaltegger, 2003).…”

Section: Origin Of Neoproterozoic Detrital Zircon-rift-related Magmatmentioning

confidence: 99%

Detrital zircon fingerprint of the Proto-Andes: Evidence for a Neoproterozoic active margin?

Chew

Magna

Kirkland

et al. 2008

Precambrian Research

131

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“…As a consequence, lithological correlation, dating and precise identification of sequences in the Puncoviscana basin are highly problematic, with the only clear data points provided by trace fossils and rare geochronological input. Based on these studies, it is clear that at least part of the Puncoviscana Formation is Early Cambrian in age (Aceñolaza et al 1999;Omarini et al 1999b with references) (Figs 1-4). Corsetti & Hagadorn (2000) noted that the ability to correlate and refer sequences from one part of the globe to another is the key to understanding those biological changes across the Neoproterozoic -Cambrian transition.…”

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confidence: 95%

Insights in the Neoproterozoic–Early Cambrian transition of NW Argentina: facies, environments and fossils in the proto-margin of western Gondwana

Aceñolaza

2007

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In NW Argentina, over 3000 metres of highly tectonized and metamorphosed siliciclastics of the Puncoviscana Formation underlie the more fossiliferous Cambro-Ordovician strata of the Mesón and Santa Victoria groups. Historically regarded as the non-fossiliferous 'basal Precambrian shield' of the region, its age was later found to be in part Phanerozoic, with the discovery of Early Cambrian trace fossils, and more recently refined with geochronological data. Widespread siliciclastic deposits characterize this sequence. A review of trace fossils in the Puncoviscana Formation has added new taxa. Trace fossil assemblages denote? geographical belts, indicating shallower marine conditions to the east (Nereites association) and deeper to the west (Oldhamia association). Such assemblages related to the palaeomorphology of the basin also represent different temporal levels, and in so doing reflect the overall evolution of the Puncoviscana Sea through time. The use of taxa that characterize Siberian stages in order to date parts of the Puncoviscana Formation should be abandoned as Siberian stages are defined by a specific set of fossils that are absent in the strata of NW Argentina. Thus, careful systematic studies and reevaluation of the strata and fauna in the Puncoviscana Basin are the only way to improve understanding of the Neoproterozoic-Cambrian transition in the Andean margin of South America.

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Puncoviscana folded belt in northwestern Argentina: testimony of Late Proterozoic Rodinia fragmentation and pre-Gondwana collisional episodes

Cited by 102 publications

References 79 publications

The Río de la Plata craton and the assembly of SW Gondwana

The Río de la Plata craton and the assembly of SW Gondwana

Detrital zircon fingerprint of the Proto-Andes: Evidence for a Neoproterozoic active margin?

Insights in the Neoproterozoic–Early Cambrian transition of NW Argentina: facies, environments and fossils in the proto-margin of western Gondwana

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