The Pampean orogeny can be considered part of the larger
Terra Australis orogeny[2] or of the
Brasiliano orogeny.[4] The Pampean orogeny developed at a similar time as the Paraguai Belt of the Brasiliano Orogeny, but in difference to the Paraguay Belt that ended up in the interior of
Gondwana the Pampean Orogen remained at a continental margin.[5] The orogen eventually ceased activity and was succeeded by the
Famatinian orogeny further west.[6]
The eastern magmatic belt of the Pampean orogeny is interpreted as the remains of a
volcanic arc associated with an east-dipping
subduction zone while the western one is thought to represent a younger volcanic arc that developed on what was once the
accretionary prism of the orogen.[2]
There have been differing views among geologists on the tectonic and paleogeographic position of the
Puncoviscana Basin in relation to the events of the Pampean orogeny. The Pampean orogeny is believed by some geologists to be associated with the
accretion of a "
Pampia Terrane" to the
Río de la Plata Craton, resulting from the
closure of a sea that existed in-between. This sea would have been the Puncoviscana Basin.[7]Víctor Ramos proposes instead that the Puncoviscana Basin was a
foreland basin located west of a "Pampia block" that collided with Río de la Plata Craton.[7][8] Contrasting to this view Aceñolaza and Toselli claim instead that the Puncoviscana Basin originated from an
aulacogen splitting
Arequipa-Antofalla Craton from
Río de la Plata and
Guaporé Craton. Following this interpretation the aulacogen would have closed during the Pampean orogeny.[7]
Notes
^The modern relief of Sierras de Córdoba is, however, related to the much more recent
Andean orogeny in the
Tertiary.[1]
^All coordinates in this article are in relation to present-day geography and not to the past disposition of continents,
terranes and oceans.
^
abcSchwartz, Joshua J.; Gromet, L. Peter; Miró, Roberto (2008). "Timing and Duration of the Calc‐Alkaline Arc of the Pampean Orogeny: Implications for the Late Neoproterozoic to Cambrian Evolution of Western Gondwana". The Journal of Geology. 116 (1): 39–61.
doi:
10.1086/524122.
JSTOR10.1086/524122.
S2CID129441236.