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Maule MT EDI data and resistivity model profile (2019)

Cordell, Darcy ; Unsworth, Martyn J ; Diaz, Daniel ; [et al.]

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In: Supplement to: Cordell, Darcy; Unsworth, Martyn J; Diaz, Daniel; Reyes-Wagner, Valentina; Currie, Claire A; Hicks, Stephen P (2019): Fluid and Melt Pathways in the Central Chilean Subduction Zone Near the 2010 Maule Earthquake (35–36°S) as Inferred From Magnetotelluric Data. Geochemistry, Geophysics, Geosystems, 20(4), 1818-1835, https://doi.org/10.1029/2018GC008167

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Publication Date: 2024-02-05

Description: The subduction zone of central Chile (36° S) has produced some of the world's largest earthquakes and significant volcanic eruptions. Understanding the fluid fluxes and structure of the subducting slab and over-riding plate can provide insight into the tectonic processes responsible for both seismicity and magmatism. Magnetotellurics (MT) is a geophysical method which is sensitive to conductive anomalies (e.g. partial melt and brines) in the subsurface. This dataset includes MT EDI data files for 38 sites collected along a profile in central Chile and western Argentina in 2016 and 2017. It includes 19 long period (10 s to 10000 s) MT stations and 19 broadband (0.001 s to 1000 s) MT stations. Four of the broadband MT sites were collected by Alterra Power Corp (now Innergex Renewable Energy Inc.) labelled MU-002, MU-003, MU-011, and MU-019 (Hickson et al., 2011). Four of the long period sites in Argentina are taken from Burd et al. (2014). This dataset also includes two geo-referenced 2-D resistivity models and the inversion parameters used to produce the model. The nonlinear conjugate gradient algorithm of Rodi and Mackie (2001) was used to produce this model. The first is the unconstrained case where no slab tear was imposed (MODEL_UNCONSTRAINED). In this folder is the geo-referenced model (longitude, latitude, depth (km b.s.l.), resistivity) as well as a folder containing the inversion input files. The second is the constrained case where a slab tear was imposed (MODEL_CONSTRAINED). This also includes a geo-referenced model (longitude latitude depth resistivity) text file and a folder containing the inversion input files.

Keywords: Central_Chile; Chile; File format; File name; File size; geophysics; magnetotellurics; maule; MULT; Multiple investigations; subduction zone; Uniform resource locator/link to file

Type: Dataset

Format: text/tab-separated-values, 12 data points

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Fluid and Melt Pathways in the Central Chilean Subduction Zone Near the 2010 Maule Earthquake (35–36°S) as Inferred From Magnetotelluric Data (2019)

Cordell, Darcy ; Unsworth, Martyn J. ; Diaz, Daniel ; [et al.]

American Geophysical Union

In: Geochemistry, Geophysics, Geosystems. 2019; 20(4): 1818-1835. Published 2019 Apr 01. doi: 10.1029/2018gc008167.

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Publication Date: 2019-04-01

Description: The subduction zone of central Chile (36°S) has produced some of the world's largest earthquakes and significant volcanic eruptions. Understanding the fluid fluxes and structure of the subducting slab and overriding plate can provide insight into the tectonic processes responsible for both seismicity and magmatism. Broadband and long-period magnetotelluric data were collected along a 350-km profile in central Chile and Argentina and show a regional geoelectric strike of 15 ± 19° east of north. The preferred two-dimensional inversion model included the geometry of the subducting Nazca plate as a constraint. On the upper surface of the Nazca plate, conductors were interpreted as fluids expelled from the downgoing slab via compaction at shallow depth (C1) and metamorphic reactions at depths of 40–90 km (C2 and C3). At greater depths (130 km), a conductor (C7) is interpreted as a region of partial melt related to deserpentinization in the backarc. A resistor on the slab interface (R1) is coincident with a high-velocity anomaly which was interpreted as a strong asperity which may affect the coseismic slip behavior of large megathrust earthquakes at this latitude. Correlations with seismicity suggest slab fluids alter the forearc mantle and define the downdip limit of the seismogenic zone. Beneath the volcanic arc, several upper crustal conductors (C4 and C5) represent partial melt beneath the Tatara-San Pedro Volcano and the Laguna del Maule Volcanic Field. A deeper lower crustal conductor (C6) underlies both volcanoes and suggests a connected network of melt in a thermally mature lower crust. ©2019. American Geophysical Union. All Rights Reserved.

Electronic ISSN: 1525-2027

Topics: Chemistry and Pharmacology , Geosciences , Physics