| Autor: |
Rossetti, F., Fellin, M. G., Ballato, P., Faccenna, C., Balestrieri, M. L., Muceku, B., Rondenay, S., Maesano, F. E., Crosetto, S., Durmischi, C., Bazzucchi, C., Maden, C. |
| Zdroj: |
Tectonics; Nov2024, Vol. 43 Issue 11, p1-24, 24p |
| Abstrakt: |
Subduction orogens grow by accretion of slices of continental lithosphere scraped off the downgoing slab. Although seismological and geophysical data now illuminate the deep structure of these orogens, understanding deep crustal underplating dynamics remains challenging. This study focuses on the Albanides, a subduction orogen in the central‐eastern Mediterranean, formed by the accretion of continental material during the eastward subduction of Adria beneath Eurasia. The thickening at depth of the crustal edifice occurred along with the development of a shallow fold‐and‐thrust belt. This process involved the deposition of progressively younger syn‐orogenic deposits as deformation migrated SW‐ward from the Cretaceous to the Miocene. To explore the relationship between deep‐seated structures and surface deformation, we investigate the recent crustal thickening of the Albanides using low‐temperature thermochronology and 3D thermokinematic modeling of a seismically constrained crustal section. Our data reveal a pulse of exhumation during the latest Miocene‐Pliocene, amounting to approximately 3–4 km, which we propose has been driven by a deep‐seated thrust system imaged by receiver function images. These inferences have significant implications for understanding the interactions between deep and shallow crustal processes and their role in shaping the Albanides. Furthermore, they provide insights into the timing and kinematics of subduction‐related orogenic processes and, potentially, on the separation of the Adria plate from Africa. Plain Language Summary: Mountain formation in regions where continental plates collide, such as the Albanides in the Mediterranean, occurs through deep processes within the Earth's crust. These processes cause fragments of the crust from the downgoing plate to be added to the overriding plate, allowing the crust to thicken. Our study focuses on understanding the growth and evolution of the Albanides by examining the interaction between deep crust structures and surface geology. We found that the Albanides experienced uplift, with exhumation of about 3–4 km during the latest Miocene‐Pliocene epochs. This uplift was likely driven by deep forces within the Earth's crust. Our findings provide insights into the processes that shape mountains and the timing and mechanics of mountain‐building. Understanding these deep processes is crucial for assessing geological hazards, as they significantly influence seismic activity in coastal areas. Key Points: Low‐temperature thermochronology indicates a pulse of 3–4 km of exhumation in the Albanides during the latest Miocene‐Pliocene3D thermokinematic modeling of deep‐seated thrusting predicts an exhumation pattern consistent with observationsLate Miocene‐Pliocene tectonic phase linked to Albanides' growth through crustal underplating within the subducting Adria microplate [ABSTRACT FROM AUTHOR] |
| Databáze: |
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