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Rapid development of spiral garnets during subduction zone metamorphism revealed from high-resolution Sm-Nd garnet geochronology
dc.contributor.author | Farrell, Thomas P. | |
dc.contributor.author | Aerden, Domingo Gerard | |
dc.contributor.author | Baxter, Ethan F. | |
dc.contributor.author | Starr, Paul G. | |
dc.contributor.author | Williams, Mike L. | |
dc.date.accessioned | 2024-04-23T07:14:30Z | |
dc.date.available | 2024-04-23T07:14:30Z | |
dc.date.issued | 2024-01-25 | |
dc.identifier.citation | Farrell, T.P., et al., 2024, Rapid development of spiral garnets during subduction zone metamorphism revealed from high-resolution Sm-Nd garnet geochronology: Geology, v. XX, p. XXX–XXX, https://doi.org/10.1130/G51882.1 | es_ES |
dc.identifier.uri | https://hdl.handle.net/10481/91040 | |
dc.description.abstract | Multiple studies have applied zoned garnet geochronology to place temporal constraints on the rates of metamorphism and deformation during orogenesis. We report new high-resolution isotope dilution–thermal ionization mass spectrometry Sm-Nd isochron ages on concentric growth zones from microstructurally and thermodynamically characterized garnets from the Betic Cordillera, southern Spain. Our ages for the garnet core (13.64 ± 0.31 Ma), mantle (13.41 ± 0.37 Ma), and rim (13.34 ± 0.45 Ma) indicate rapid garnet growth and are consistent with published garnet ages interpreted to reflect high-pressure metamorphism in the region. Thermodynamic analysis indicates garnets grew during subduction at ∼1.5–2.0 GPa and 570–600 °C. The core to rim duration of spiral garnet growth was just a few hundred thousand years. While other zoned garnet studies have shown similar rapid growth in subduction zone settings, this is the first documentation of such rapid growth of a spiral garnet. Combining this garnet growth duration with the magnitude of spiral inclusion trail curvature, we compute a strain rate of ∼10−13 s−1, an order of magnitude faster than all previous spiral garnet studies. We interpret that these spiral garnets recorded a rapid pulse of deformation and strain during the final stages of subduction and incipient exhumation. | es_ES |
dc.description.sponsorship | Spanish grants CGL2015–65602-R (AEI-FEDER), P18-RT-3275, and B-RNM-301-UGR18 (Junta de Andaucía/FEDER) | es_ES |
dc.description.sponsorship | U.S. National Science Foundation grants PIRE-1545903 and EAR-1946651 | es_ES |
dc.language.iso | eng | es_ES |
dc.publisher | Geological Society of America | es_ES |
dc.rights | Atribución 4.0 Internacional | * |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | * |
dc.title | Rapid development of spiral garnets during subduction zone metamorphism revealed from high-resolution Sm-Nd garnet geochronology | es_ES |
dc.type | info:eu-repo/semantics/article | es_ES |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | es_ES |
dc.identifier.doi | 10.1130/G51882.1 | |
dc.type.hasVersion | info:eu-repo/semantics/publishedVersion | es_ES |