Por: Cristian Machaca, Ginaldo Campanha y Mauricio Parra, Instituto de Geociências, Universidade de São Paulo; Oriol Ferrer, Facultad de Ciencias de la Tierra, Universidad de Barcelona; y Oskar Vidal, Terractiva.

Primer puesto en formato oral post-grado, III Concurso Internacional de Estudiantes SEG-IIMP (proEXPLO 2026).

Abstrac

The Marañon Fold and Thrust Belt (MFTB), situated in the central to northern Peruvian Andes, is a key region for understanding the structural evolution of the Andean orogeny. This study presents a kinematic model of the MFTB based on a 67.9 km long restored cross-section along the Antamina-Llata transect. 

Through the integration of field data, a new geological map, and apatite (U-Th)/He dating, the study identifies a tectonic framework characterized by the interaction between thin-skinned and thick-skinned deformation styles. 

This study highlights the importance of kinematic modeling of the Antamina-Llata cross-section, reconstructing the tectonic history of the MFTB and providing new insights into the evolution of the Peruvian Andes. The Chonta Fault plays a key role in the uplift of the basement and the formation of the imbricate fan shortcut of Antamina. The calculated shortening along the section is approximately 28.4%.