ORCID Profile
0000-0001-9640-6977
Current Organisations
Universidad Austral de Chile
,
Centre National de la Recherche Scientifique
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Publisher: Elsevier BV
Date: 05-2018
Publisher: American Geophysical Union (AGU)
Date: 10-2002
DOI: 10.1029/2001GL014398
Publisher: Elsevier
Date: 2015
Publisher: Elsevier BV
Date: 2005
Publisher: Elsevier BV
Date: 04-2007
Publisher: Elsevier BV
Date: 11-2013
Publisher: Elsevier BV
Date: 09-2003
Publisher: Springer Science and Business Media LLC
Date: 28-04-2021
Publisher: Elsevier BV
Date: 2008
Publisher: Springer Science and Business Media LLC
Date: 14-01-2005
Publisher: Elsevier BV
Date: 03-2011
Publisher: Elsevier BV
Date: 08-2006
Publisher: Wiley
Date: 28-03-2019
DOI: 10.1002/GEA.21736
Publisher: American Geophysical Union (AGU)
Date: 02-2012
DOI: 10.1029/2011JB008733
Publisher: Springer Science and Business Media LLC
Date: 10-10-2017
DOI: 10.1038/S41467-017-00821-Z
Abstract: Gold enrichment at the crustal or mantle source has been proposed as a key ingredient in the production of giant gold deposits and districts. However, the lithospheric-scale processes controlling gold endowment in a given metallogenic province remain unclear. Here we provide the first direct evidence of native gold in the mantle beneath the Deseado Massif in Patagonia that links an enriched mantle source to the occurrence of a large auriferous province in the overlying crust. A precursor stage of mantle refertilisation by plume-derived melts generated a gold-rich mantle source during the Early Jurassic. The interplay of this enriched mantle domain and subduction-related fluids released during the Middle-Late Jurassic resulted in optimal conditions to produce the ore-forming magmas that generated the gold deposits. Our study highlights that refertilisation of the subcontinental lithospheric mantle is a key factor in forming large metallogenic provinces in the Earth’s crust, thus providing an alternative view to current crust-related enrichment models.
Publisher: Elsevier
Date: 2007
Publisher: American Association for the Advancement of Science (AAAS)
Date: 17-09-2010
Abstract: In order to understand the behavior of materials in the solid deep Earth, it is important to be able to estimate how a material melts at high pressure. To this end, Fiquet et al. (p. 1516 ) performed experiments using a laser-heated diamond anvil cell coupled to in situ synchrotron measurements of peridotite rock—a mixture of minerals thought to represent Earth's upper mantle—across a wide pressure range. The results suggest that liquid phases may exist at very high pressure values, such that seismically anomalous zones near the boundary between the core and the mantle may result from isolated pockets of melt. Along similar lines, the base of primitive Earth's mantle may have acquired its trace element signature from partial melting of certain mineral phases higher up in the mantle.
Publisher: Elsevier BV
Date: 08-2018
Publisher: Elsevier BV
Date: 06-2005
Publisher: Elsevier BV
Date: 10-2011
Publisher: Elsevier BV
Date: 05-2008
Publisher: Elsevier BV
Date: 04-2017
Publisher: Springer Science and Business Media LLC
Date: 05-2019
Publisher: Oxford University Press (OUP)
Date: 15-03-2018
DOI: 10.1093/NSR/NWY032
Abstract: Volatiles, such as carbon and water, modulate the Earth's mantle rheology, partial melting and redox state, thereby playing a crucial role in the Earth's internal dynamics. We experimentally show the transformation of goethite FeOOH in the presence of CO2 into a tetrahedral carbonate phase, Fe4C3O12, at conditions above 107 GPa—2300 K. At temperatures below 2300 K, no interactions are evidenced between goethite and CO2, and instead a pyrite-structured FeO2Hx is formed as recently reported by Hu et al. (2016 2017) and Nishi et al. (2017). The interpretation is that, above a critical temperature, FeO2Hx reacts with CO2 and H2, yielding Fe4C3O12 and H2O. Our findings provide strong support for the stability of carbon-oxygen-bearing phases at lower-mantle conditions. In both subducting slabs and lower-mantle lithologies, the tetrahedral carbonate Fe4C3O12 would replace the pyrite-structured FeO2Hx through carbonation of these phases. This reaction provides a new mechanism for hydrogen release as H2O within the deep lower mantle. Our study shows that the deep carbon and hydrogen cycles may be more complex than previously thought, as they strongly depend on the control exerted by local mineralogical and chemical environments on the CO2 and H2 thermodynamic activities.
Publisher: Frontiers Media SA
Date: 11-02-2020
Publisher: Elsevier BV
Date: 30-10-2009
Publisher: Springer Science and Business Media LLC
Date: 19-01-2005
Publisher: Elsevier BV
Date: 10-2001
Publisher: Elsevier BV
Date: 06-2020
Publisher: Elsevier BV
Date: 09-2022
Publisher: Springer Science and Business Media LLC
Date: 10-2002
Publisher: Elsevier BV
Date: 07-2020
Publisher: Elsevier BV
Date: 02-2009
Publisher: American Geophysical Union (AGU)
Date: 09-2007
DOI: 10.1029/2007GL030712
Publisher: Elsevier BV
Date: 09-2012
Publisher: Elsevier BV
Date: 06-2004
Publisher: Proceedings of the National Academy of Sciences
Date: 14-03-2011
Abstract: The global geochemical carbon cycle involves exchanges between the Earth’s interior and the surface. Carbon is recycled into the mantle via subduction mainly as carbonates and is released to the atmosphere via volcanism mostly as CO 2 . The stability of carbonates versus decarbonation and melting is therefore of great interest for understanding the global carbon cycle. For all these reasons, the thermodynamic properties and phase diagrams of these minerals are needed up to core mantle boundary conditions. However, the nature of C-bearing minerals at these conditions remains unclear. Here we show the existence of a new Mg-Fe carbon-bearing compound at depths greater than 1,800 km. Its structure, based on three-membered rings of corner-sharing (CO 4 ) 4- tetrahedra, is in close agreement with predictions by first principles quantum calculations [Oganov AR, et al. (2008) Novel high-pressure structures of MgCO 3 , CaCO 3 and CO 2 and their role in Earth’s lower mantle. Earth Planet Sci Lett 273:38–47]. This high-pressure polymorph of carbonates concentrates a large amount of Fe (III) as a result of intracrystalline reaction between Fe (II) and (CO 3 ) 2- groups schematically written as 4FeO + CO 2 → 2Fe 2 O 3 + C. This results in an assemblage of the new high-pressure phase, magnetite and nanodiamonds.
Publisher: Springer Science and Business Media LLC
Date: 07-2005
DOI: 10.1038/NATURE03827
Abstract: Calculations of the energetics of terrestrial accretion indicate that the Earth was extensively molten in its early history. Examination of early Archaean rocks from West Greenland (3.6-3.8 Gyr old) using short-lived 146Sm-142Nd chronometry indicates that an episode of mantle differentiation took place close to the end of accretion (4.46 +/- 0.11 Gyr ago). This has produced a chemically depleted mantle with an Sm/Nd ratio higher than the chondritic value. In contrast, application of 176Lu-176Hf systematics to 3.6-3.8-Gyr-old zircons from West Greenland indicates derivation from a mantle source with a chondritic Lu/Hf ratio. Although an early Sm/Nd fractionation could be explained by basaltic crust formation, magma ocean crystallization or formation of continental crust, the absence of coeval Lu/Hf fractionation is in sharp contrast with the well-known covariant behaviour of Sm/Nd and Lu/Hf ratios in crustal formation processes. Here we show using mineral-melt partitioning data for high-pressure mantle minerals that the observed Nd and Hf signatures could have been produced by segregation of melt from a crystallizing magma ocean at upper-mantle pressures early in Earth's history. This residual melt would have risen buoyantly and ultimately formed the earliest terrestrial protocrust.
Location: United Kingdom of Great Britain and Northern Ireland
Location: United States of America
Start Date: 2013
End Date: 2016
Funder: Agencia Nacional de Investigación y Desarrollo
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