Exhumed serpentinites and their tectonic significance in non-collisional orogens

Donoso-Tapia, Damián
Flores, Kennet E
Martin, Celine
Gazel, Esteban
Marsh, Jeffrey
We studied serpentinite samples from five river basins in a segment of the non-collisional Andean orogen in Ecuador (Cordillera Real). All samples are fully serpentinized with antigorite as the main polymorph, indicative of high-temperature serpentinization, while spinel is the only relic phase. Whole-rock rare earth element data suggest an abyssal setting for the protoliths. In-situ B isotope data on antigorite (delta 11B = -15.9‰ to +5.7‰) and chlorite (delta 11B = -6.3‰ to -3.6‰) favor serpentinization by crust-derived metamorphic fluids in a mantle wedge setting. Our data suggest four different mantle wedge-derived serpentinite slivers draining into the northern Cordillera Real stream network, likely associated with Triassic, Jurassic-Early Cretaceous, and potentially Late Cretaceous-Paleocene high-pressure low-temperature metamorphic sequences. We propose that serpentinites in non-collisional orogens are sourced from underplated slab slivers that undergo intense serpentinization by crust-derived metamorphic fluids in the mantle wedge prior to their exhumation during extensional phases.
How to cite this dataset:
Donoso-Tapia, D., Flores, K. E., Martin, C., Gazel, E., Marsh, J., 2024. Exhumed serpentinites and their tectonic significance in non-collisional orogens, Version 1.0. Interdisciplinary Earth Data Alliance (IEDA). https://doi.org/10.26022/IEDA/112939. Accessed 2024-05-25.
DOI Creation Date:
Manuscript submitted to AGU Tectonics
Creative Commons Attribution-ShareAlike 4.0 International [CC-BY-SA-4.0]
Funding source(s):
National Science Foundation: 2150618
National Science Foundation: 1951166
Coverage Scope: Regional (Continents, Oceans)
Geographic Location: Ecuadorian Cordillera Real
User Contributed Keyword(s):
Serpentinites, Fluid-rock interaction, Boron isotopes, Subduction Zones, non-collisional Orogens, Andes
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