The role of the slab pull force in the late Oligocene to early Miocene extension in the Southern Central Andes (27°-46°S): Insights from numerical modeling

Although extensional deformation plays a significant part of Andean history, the causes behind its driving mechanisms and its impact throughout the geological record remain controversial. Through the aid of numerical modeling of subduction zone dynamics, we were able to reproduce a brief period of i...

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Autor principal: Fennell, L.M
Otros Autores: Quinteros, J., Iannelli, S.B, Litvak, V.D, Folguera, A.
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: Elsevier Ltd 2018
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100 1 |a Fennell, L.M. 
245 1 4 |a The role of the slab pull force in the late Oligocene to early Miocene extension in the Southern Central Andes (27°-46°S): Insights from numerical modeling 
260 |b Elsevier Ltd  |c 2018 
270 1 0 |m Fennell, L.M.; CONICET - Universidad de Buenos Aires, Instituto de Estudios Andinos Don Pablo Groeber (IDEAN)Argentina; email: lucasfennell90@gmail.com 
506 |2 openaire  |e Política editorial 
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520 3 |a Although extensional deformation plays a significant part of Andean history, the causes behind its driving mechanisms and its impact throughout the geological record remain controversial. Through the aid of numerical modeling of subduction zone dynamics, we were able to reproduce a brief period of intra-arc basin formation that affected the Southern Central Andes (27°-46°S) during late Oligocene and early Miocene times. The results of the model show that, after a period of slow subduction (6–8 cm/yr), the oceanic plate approaches the mantle transition zone at ca. 23 Ma, triggering the slab pull force. The addition of this slab pull force generates a progressive increase in convergence velocity (reaching ∼20 cm/yr) and the retreat of the trench hinge away from the upper plate, resulting in the steepening of the slab. Effects observed in the upper plate are the formation of a basin located 200–300 km east of the trench and an asthenospheric influx beneath an 800 km wide zone east of the oceanic and continental plate's boundary. A series of parameters extracted from our model, such as the basin depth and the stretching factor, indicate that crustal stretching, basin formation, convergence velocity and asthenospheric influx would have reached their climax approximately at 20 Ma. These results are in good correlation with the convergence rate obtained through plate reconstructions and the geological record along the Southern Central Andes, where a series of extensional intra-arc basins were created and mantle derived magmatic processes affected a wide area ranging between the present fore-arc and retroarc areas during late Oligocene to early Miocene times. However, differences in extension magnitude, magma composition and basin fill depositional environment are observed, indicating that the impact of the slab pull force was stronger towards the southern basins. Possible causes that could explain these differences are variations in crustal thickness before the influence of the slab pull force and the effect of toroidal mantle flow near the southern lateral slab edge. This would indicate that although the main parameter controlling tectonic regime is the absolute motion of the overriding plate, the slab pull force may leave its imprint along the evolution of subduction-type orogens such as the Andes. © 2018 Elsevier Ltd  |l eng 
536 |a Detalles de la financiación: Helmholtz Association, HIRG-0008 
536 |a Detalles de la financiación: Consejo Nacional de Investigaciones Científicas y Técnicas, PIP 2015-2017 11220150100426 
536 |a Detalles de la financiación: We acknowledge Marius Walter and the GFZ Geodynamic modeling section for their support during the corresponding author's three month stay as part of a collaboration project between CONICET and Helmholtz Association entitled “Geodynamic evolution of the Neuquén Andes: implications for Geo-Resources”. We would like to particularly acknowledge Nick Perez, Sascha Brune and Muriel Gerbault for their helpful revisions, which served to greatly improve an early version of this manuscript. This work has been possible through the financial support of the Helmholtz Association (grant HIRG-0008 ) and CONICET (grant PIP 2015-2017 11220150100426 ). This is the contribution R-242 of the Instituto de Estudios Andinos “Don Pablo Groeber”. Appendix A 
593 |a CONICET - Universidad de Buenos Aires, Instituto de Estudios Andinos Don Pablo Groeber (IDEAN), Buenos Aires, 1428, Argentina 
593 |a GFZ Helmholtz Centre Potsdam, Telegrafenberg, Potsdam, 14473, Germany 
690 1 0 |a ASTHENOSPHERIC INFLUX 
690 1 0 |a BACK-ARC BASIN 
690 1 0 |a CONVERGENCE VELOCITY 
690 1 0 |a INTRA-ARC BASIN 
690 1 0 |a SUBDUCTION 
690 1 0 |a SYNEXTENSIONAL DEPOSITION 
690 1 0 |a ASTHENOSPHERE 
690 1 0 |a BACKARC BASIN 
690 1 0 |a DEFORMATION 
690 1 0 |a DEPOSITIONAL ENVIRONMENT 
690 1 0 |a MIOCENE 
690 1 0 |a NUMERICAL MODEL 
690 1 0 |a OLIGOCENE 
690 1 0 |a PLATE BOUNDARY 
690 1 0 |a SLAB 
690 1 0 |a SUBDUCTION ZONE 
690 1 0 |a ANDES 
700 1 |a Quinteros, J. 
700 1 |a Iannelli, S.B. 
700 1 |a Litvak, V.D. 
700 1 |a Folguera, A. 
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