Subducted iron and glassy spherules in the upper mantle?

Subducted iron and glassy spherules in the upper mantle?

ABSTRACT Spherules are documented in ophiolitic mantle rocks such as peridotites and associated chromitites. They consist of: (1) native iron having variable amounts of Ni with/without inclusions of silicate glass or oxides (wüstite), (2) dendritic intergrowth of oxides (magnetite, wüstite and hematite) with/without silicate glass and, (3) silicate glass. Consensually, they are interpreted as indigenous to chromitites and related with high-temperature processes operating in the Earth’s upper mantle. However, their similarity with terrestrial and extraterrestrial spherules found in other settings of the geological record is remarkable. We raise the question on such indigenous origin, relating them to volcanic and cosmic material recycled back to the mantle wedge where chromitites form during subduction.

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Main Authors: González-Jiménez,José M., Sergeeva,Ivanina, Kerestedjian,Thomas N., Gervilla,Fernando
Format: Digital revista
Language:English
Published: Sociedad Geológica Mexicana A.C. 2022
Online Access:http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-33222022000300014
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spelling oai:scielo:S1405-332220220003000142023-07-25Subducted iron and glassy spherules in the upper mantle?González-Jiménez,José M.Sergeeva,IvaninaKerestedjian,Thomas N.Gervilla,Fernando spherules iron glass upper mantle chromitite subduction ABSTRACT Spherules are documented in ophiolitic mantle rocks such as peridotites and associated chromitites. They consist of: (1) native iron having variable amounts of Ni with/without inclusions of silicate glass or oxides (wüstite), (2) dendritic intergrowth of oxides (magnetite, wüstite and hematite) with/without silicate glass and, (3) silicate glass. Consensually, they are interpreted as indigenous to chromitites and related with high-temperature processes operating in the Earth’s upper mantle. However, their similarity with terrestrial and extraterrestrial spherules found in other settings of the geological record is remarkable. We raise the question on such indigenous origin, relating them to volcanic and cosmic material recycled back to the mantle wedge where chromitites form during subduction.info:eu-repo/semantics/openAccessSociedad Geológica Mexicana A.C.Boletín de la Sociedad Geológica Mexicana v.74 n.3 20222022-01-01info:eu-repo/semantics/articletext/htmlhttp://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-33222022000300014en10.18268/bsgm2022v74n3a200722
institution SCIELO
collection OJS
country México
countrycode MX
component Revista
access En linea
databasecode rev-scielo-mx
tag revista
region America del Norte
libraryname SciELO
language English
format Digital
author González-Jiménez,José M.
Sergeeva,Ivanina
Kerestedjian,Thomas N.
Gervilla,Fernando
spellingShingle González-Jiménez,José M.
Sergeeva,Ivanina
Kerestedjian,Thomas N.
Gervilla,Fernando
Subducted iron and glassy spherules in the upper mantle?
author_facet González-Jiménez,José M.
Sergeeva,Ivanina
Kerestedjian,Thomas N.
Gervilla,Fernando
author_sort González-Jiménez,José M.
title Subducted iron and glassy spherules in the upper mantle?
title_short Subducted iron and glassy spherules in the upper mantle?
title_full Subducted iron and glassy spherules in the upper mantle?
title_fullStr Subducted iron and glassy spherules in the upper mantle?
title_full_unstemmed Subducted iron and glassy spherules in the upper mantle?
title_sort subducted iron and glassy spherules in the upper mantle?
description ABSTRACT Spherules are documented in ophiolitic mantle rocks such as peridotites and associated chromitites. They consist of: (1) native iron having variable amounts of Ni with/without inclusions of silicate glass or oxides (wüstite), (2) dendritic intergrowth of oxides (magnetite, wüstite and hematite) with/without silicate glass and, (3) silicate glass. Consensually, they are interpreted as indigenous to chromitites and related with high-temperature processes operating in the Earth’s upper mantle. However, their similarity with terrestrial and extraterrestrial spherules found in other settings of the geological record is remarkable. We raise the question on such indigenous origin, relating them to volcanic and cosmic material recycled back to the mantle wedge where chromitites form during subduction.
publisher Sociedad Geológica Mexicana A.C.
publishDate 2022
url http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-33222022000300014
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AT sergeevaivanina subductedironandglassyspherulesintheuppermantle
AT kerestedjianthomasn subductedironandglassyspherulesintheuppermantle
AT gervillafernando subductedironandglassyspherulesintheuppermantle
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