Boekhout F. auteur aut IRD Spikings R. auteur aut IRD Sempéré Thierry auteur aut IRD Chiaradia M. auteur aut IRD Ulianov A. auteur aut IRD Schaltegger U. auteur aut IRD text journalArticle eng text/pdf born digital access A high-resolution U-Pb zircon geochronological study of plutonic units along the south Peruvian margin between 17 degrees and 18 degrees S allows the integration of the geochemical, geodynamic and tectonic evolution of this part of the Andean margin. This study focuses on the composite Jurassic-early Cretaceous Ilo Batholith that was emplaced along the southern Peruvian coast during two episodes of intrusive magmatism; a first period between 173 and 152 Ma (with a peak in magmatic activity between roughly 168 and 162 Ma) and a second period between 110 and 106 Ma. Emplacement of the Jurassic part of the composite Ilo Batholith shortly post-dated the accumulation of the volcanosedimentary succession it intruded (Chocolate formation), which allows to estimate a subsidence rate for this unit of similar to 3.5 km/Ma. The emplacement of the main peak of Jurassic plutonism of the Ilo Batholith was also closely coeval with widespread and repeated slumping (during deposition of the Cachios Formation) in the back-arc region, suggesting a common causal link between these phenomena, which is discussed in the context of an observed 100 km trenchward arc migration at similar to 175 Ma, and the relation with extensional tectonics that prevailed along the Central Andean margin during Pangaea break-up. specialized Peru Zircon Jurassic Batholith Subduction Extension 066 064 146 48-64 2012 0024-4937 https://www.documentation.ird.fr/hor/fdi:010057099 10.1016/j.lithos.2012.04.015 0024-4937 [F B010057099] https://www.documentation.ird.fr/hor/fdi:010057099 https://www.documentation.ird.fr/intranet/publi/2012/09/010057099.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2012-10-03 2017-08-23 fdi:010057099 fre