@misc{10481/78255,
year = {2022},
month = {9},
url = {https://hdl.handle.net/10481/78255},
abstract = {High-resolution microstructural analysis of porphyroblast inclusion trails integrated with Sm-Nd
garnet geochronology has provided new insight into the tectonic history of the Betic-Rif orogen. Three principal
age groups of porphyroblasts are demonstrated with distinctly oriented inclusion-trails. Inclusion-trail curvature
axes or “FIA” (Foliation Inflexion/Intersection Axes) are shown to represent “fossilized” crenulation axes
from which a succession of different crustal shortening directions can be deduced. The regional consistency
of microstructural orientations and their geometric relationship with multiple sets of macroscopic folds
reveal the composite character of the Gibraltar Arc formed by a superposition of different folding directions
and associated lineations. Bulk-garnet ages of 35–22 Ma obtained from five micaschist samples of the
Alpujarride-Sebtide complex (ASC) and of 35–13 Ma from four micaschists of the Nevado-Filabride complex
(NFC) allow to deduce NNE-SSW directed shortening in the Late Eocene changing to NW-SE shortening in
the early Oligocene, alternating with suborthogonal NE-SW shortening during the Miocene. These directions
can be related to a major swing in the direction of relative Africa-Iberia plate-motion known from kinematic
modeling of magnetic seafloor anomalies, and subsequent dynamic interference between plate convergence and
suborthogonal “tectonic escape” of the Alboran Domain. Coupled to previously established P-T-t paths, the
new garnet ages support a common tectono-metamorphic evolution of the ASC and NFC as laterally equivalent
orogenic domains until, in the Miocene, the second became re-buried under the first.},
organization = {NSF Grant EAR-1250497},
organization = {PIRE-1545903},
organization = {Spanish project “DAMAGE” (CGL2016-80687-R AEI/FEDER)},
organization = {Junta de Andalucía project RNM148},
organization = {PhD Grant (FPU) from the Spanish government},
organization = {Open access fees have been funded by Universidad de Granada /CBUA},
publisher = {American Geophysical Union},
title = {Refined Tectonic Evolution of the Betic-Rif Orogen Through Integrated 3-D Microstructural Analysis and Sm-Nd Dating of Garnet Porphyroblasts},
doi = {10.1029/2022TC007366},
author = {Aerden, Domingo Gerard and Farrell, Thomas P. and Baxter, Ethan F. and Ruiz Fuentes, Alejandro and Bouybaouene, Mohamed},
}