@misc{10481/77167,
year = {2022},
month = {9},
url = {https://hdl.handle.net/10481/77167},
abstract = {Field observations within the Atg-serpentinite domain of the subducted ultramafic massif from Cerro del Almirez (SE Spain) reveal the existence of two generations of
abundant olivine-rich veins formed as open, mixed mode and shear fractures during prograde metamorphism. Type I veins were synchronous with the development
of the serpentinite main foliation (S1) and shearing, whereas Type II veins post-date the S1 surfaces. These structural relationships indicate that, while the Atgserpentinites
underwent ductile plastic deformation at temperatures of 450◦-600 ◦C and pressures of 0.7–1.7 GPa, they also experienced punctuated brittle
behaviour events. The brittle fractures were most likely due to fluid overpressures formed by release of H2O during the brucite breakdown reaction for the case of
Type I veins (2 vol % H2O) and due to a combination of minor dehydration reactions related to continuous compositional and structural changes in antigorite (0.3 vol
% H2O) for Type II veins. Type II olivine-rich veins were formed by brittle failure in a well-defined paleo-stress field and were not significantly deformed after their
formation. Comparison of the principal paleo-stress orientation inferred from Type II veins with those formed at peak metamorphic conditions in the ultramafic rocks
at Cerro del Almirez shows a relative switch in the orientation of the maximum and minimum principal paleo-stress axes. These relative changes can be attributed to
the cyclic evolution of shear stress, fluid pressure and fault-fracture permeability allowing for stress reversal.},
organization = {MICIN/AEI	PID2019-105192GB-I00},
organization = {Junta de Andalucia	RNM-208	
RNM-141	
RNM-145	
RNM-131	
RNM-374},
organization = {FEDER program "una manera de hacer Europa"},
organization = {Spanish Government	RYC2018-024363-I},
organization = {Universidad de Granada/ CBUA},
publisher = {Elsevier},
title = {Olivine-rich veins in high-pressure serpentinites: A far-field paleo-stress snapshot during subduction},
doi = {10.1016/j.jsg.2022.104721},
author = {Jabaloy Sánchez, Antonio and Padrón Navarta, José Alberto and Hidas, Károly and Gómez Pugnaire, María Teresa and Garrido, Carlos J.},
}