Abstract
• Lack of evidence to support a counterclockwise rotation of the Piñon block and the coeval opening of the Progreso Basin. • Forearc basin controlled by the complex interplay of oblique subduction, rise of an outer forearc high, and tectonic escape. • Post-accretion strain partitioning across an outer wedge with a varying trench-parallel oriented deformation.
Highlights
Aleman et al, [2021] propose a model for the evolution of the Pro greso Basin, located at the southernmost Northern Andes, based on the assumption of a counterclockwise rotation of the “Chongon/Colonghe orocline”
The different tectonic processes presented by Aleman et al, [2021], which form the basis for their regional tectonic framework controlling the development of the Progreso Basin, require further details or evidence
Among those details we would like to have seen constraints on 1) the late Paleocene arc-plateau collision event (“Cayo arc” and Pinon Block), leading to the development of a NW-SE foredeep Paleocene-Eocene basin; and 2) structural and paleomagnetic constraints that support the proposal of a ~30◦ counterclockwise rota tion of the Chongon/Colonche orocline
Summary
Aleman et al, [2021] propose a model for the evolution of the Pro greso Basin, located at the southernmost Northern Andes, based on the assumption of a counterclockwise rotation of the “Chongon/Colonghe orocline”. Despite the Progreso Basin being the main focus of their article, the authors address several geodynamic aspects that in our opinion require a thorough evaluation Among those we found: (1) the disagreement with the Caribbean Large Igneous Province (CLIP) model, without presenting any compelling argument and overlooking updated studies; (2) their tardy middle to Late Eocene subduction initiation coeval with the emplacement of the Macuchi arc disregarding possible flat-slab subduction periods and overlooking the presence of intrusions of Paleocene age, which suggest a subduction system in place by the Paleocene; (3) the dubious suture between their “Cayo arc” and the Pinon Block based on a direct link to the higher frequency content of gravity and magnetic anomalies; (4) the development of a NW-SE elongated lithospheric flexure (tectonic framework for their Paleocene to Eocene foredeep basin) triggered by their proposed short-lived Late Paleocene collision; (5) the transpressional character of the Jubones fault and its role on the development of a N-NE vergence fold and thrust belt; (6) the use of chronological and petrographical data without pre senting basic and necessary information about sample location, analyt ical methods, operability conditions, errors, etc. The latter controlling the southern widening of the basin at least since the middle Miocene
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