Structural controls along the Peruvian Subandes

Zamora, Gonzalo; Louterbach, Mélanie; Arriola, Pedro

doi:10.1016/b978-0-12-816009-1.00015-0

Cited by 2 publications

(1 citation statement)

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“…In Model 3 (Figures 10a and 10b), such décollement permitted the forward translation of the proto-wedge defining a large-transport, source-fed thrust that accounts for about 40% of the total shortening. Large-transport thrusts have been described in natural fold-and-thrust belts involving salt décollements such as the Salt Range in Pakistan (Grelaud et al, 2002), the Quele Fault in the Kuqa Basin of NW China (Izquierdo-Llavall et al, 2018;Rowan, 2017), and the Chazuta thrust in the Sub-Andean zone of northern Peru (Borderie et al, 2019;Eude et al, 2015;Zamora et al, 2019Zamora et al, , 2022. Mechanically, the occurrence of large-transport faults is favored by a thick and very effective, low yield-strength, or viscous layer, a sedimentary wedge on top of it (mechanically equivalent to our proto-wedge) and forward salt inflation (Borderie et al, 2019;Ferrer et al, 2022); characteristics that converge in our Models 2 and 3.…”

Section: Role Of Inherited Salt-related Rifted Margin Architecture An...mentioning

confidence: 99%

From Salt‐Bearing Rifted Margins to Fold‐And‐Thrust Belts. Insights From Analog Modeling and Northern Calcareous Alps Case Study

et al. 2022

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Section: Role Of Inherited Salt-related Rifted Margin Architecture An...mentioning

confidence: 99%

From Salt‐Bearing Rifted Margins to Fold‐And‐Thrust Belts. Insights From Analog Modeling and Northern Calcareous Alps Case Study

et al. 2022

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Depositional sequences in northern Peru: new insights on the palaeogeographic and palaeotectonic reconstruction of western Gondwana during late Permian and Triassic

Carrillo

Barragán

Hurtado

et al. 2021

JGS

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Late Permian to Early Jurassic strata in northern Peru allows us to carry out a seismo-stratigraphic, litho-tectonic and chemostratigraphic analysis connecting the Andean-Amazonian foreland basins of Huallaga, Ucayali, southern Marañón, and the Eastern Cordillera. This analysis and data integration from Ecuador to western Brazil and southern Peru and Bolivia, allow us to redefine the timing of the major documented tectonic phases and corresponding palaeogeographies of western Gondwana from the late Permian to Triassic. Three litho-tectonic sequences and four associated deformation stages are recognized: 1) A sequence, tectonic relaxation, during late Permian; 2) A-B intra-sequence, folding-and-thrusting attributed to a continuation in time of the Gondwanide Orogeny, during the Early to Middle Triassic; 3) B sequence, rifting, attributed to Gondwana breakup during the Middle and Late Triassic; and 4) C Sequence, thermal sag, during the Late Triassic. Evaporites and carbonates (A sequence) dominated a low subsidence basin with southern restricted marine inflow at the Permian-Triassic boundary. A novel palaeogeographic model for these evaporites suggests that this saline basin extended up to 50,000 km2 in a restricted environment area with a potential bullseye pattern. The last pulse of the Gondwanide Orogeny and associated fold and thrust belt (A-B intra-sequence) exhumed previous the sequence generating emerged areas with little to no sedimentation. Red beds (B sequence) characterize the rifting stage, representing the syn-depositional infill of continental grabens, likely extending to the Acre Basin in Brazil. Finally, during the thermal sag, a marine inflow likely from the northwestern part of Peru generated sedimentation of carbonates and evaporites (C Sequence) to the west and east of the Peruvian margin. This sediment differentiation was, in part, controlled by the existence of pre-existing grabens associated to the previous rifting stage. This interpretation, together with other evaporitic occurrences attributed here to a Late Triassic epoch in south and north Peru and west Brazil, suggest the existence of an evaporitic basin filling an undeformed area of probably ca. 170,000 km2. It is therefore suggestive of the existence of a Late Triassic (Norian to Rhaetian; 217 to 204 Ma) salt giant controlled by thermal sag in western Gondwana. Our results are of great relevance for any future interpretation related to mass extinctions, paleoclimatic analysis and ocean dynamics during the Permian and Triassic as well as natural resources distribution between Ecuador and Bolivia.

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Structural controls along the Peruvian Subandes

Cited by 2 publications

References 44 publications

From Salt‐Bearing Rifted Margins to Fold‐And‐Thrust Belts. Insights From Analog Modeling and Northern Calcareous Alps Case Study

From Salt‐Bearing Rifted Margins to Fold‐And‐Thrust Belts. Insights From Analog Modeling and Northern Calcareous Alps Case Study

Depositional sequences in northern Peru: new insights on the palaeogeographic and palaeotectonic reconstruction of western Gondwana during late Permian and Triassic

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