Composition and Pressure Effects on Partitioning of Ferrous Iron in Iron-Rich Lower Mantle Heterogeneities

Both seismic observations of dense low shear velocity regions and models of magma ocean crystallization and mantle dynamics support enrichment of iron in Earth’s lowermost mantle. Physical properties of iron-rich lower mantle heterogeneities in the modern Earth depend on distribution of iron between...
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Autor*in:	Susannah M. Dorfman [verfasserIn] Farhang Nabiei [verfasserIn] Charles-Edouard Boukaré [verfasserIn] Vitali B. Prakapenka [verfasserIn] Marco Cantoni [verfasserIn] James Badro [verfasserIn] Philippe Gillet [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2021

Schlagwörter:	iron partitioning lower mantle mantle heterogeneities laser-heated diamond anvil cell experimental petrology

Übergeordnetes Werk:	In: Minerals - MDPI AG, 2012, 11(2021), 5, p 512
Übergeordnetes Werk:	volume:11 ; year:2021 ; number:5, p 512

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3390/min11050512

Katalog-ID:	DOAJ067391362

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520			\|a Both seismic observations of dense low shear velocity regions and models of magma ocean crystallization and mantle dynamics support enrichment of iron in Earth’s lowermost mantle. Physical properties of iron-rich lower mantle heterogeneities in the modern Earth depend on distribution of iron between coexisting lower mantle phases (Mg,Fe)O magnesiowüstite, (Mg,Fe)SiO<sub<3</sub< bridgmanite, and (Mg,Fe)SiO<sub<3</sub< post-perovskite. The partitioning of iron between these phases was investigated in synthetic ferrous-iron-rich olivine compositions (Mg<sub<0.55</sub<Fe<sub<0.45</sub<)<sub<2</sub<SiO<sub<4</sub< and (Mg<sub<0.28</sub<Fe<sub<0.72</sub<)<sub<2</sub<SiO<sub<4</sub< at lower mantle conditions ranging from 33–128 GPa and 1900–3000 K in the laser-heated diamond anvil cell. The resulting phase assemblages were characterized by a combination of in situ X-ray diffraction and ex situ transmission electron microscopy. The exchange coefficient between bridgmanite and magnesiowüstite decreases with pressure and bulk Fe# and increases with temperature. Thermodynamic modeling determines that incorporation and partitioning of iron in bridgmanite are explained well by excess volume associated with Mg-Fe exchange. Partitioning results are used to model compositions and densities of mantle phase assemblages as a function of pressure, FeO-content and SiO<sub<2</sub<-content. Unlike average mantle compositions, iron-rich compositions in the mantle exhibit negative dependence of density on SiO<sub<2</sub<-content at all mantle depths, an important finding for interpretation of deep lower mantle structures.
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allfields	10.3390/min11050512 doi (DE-627)DOAJ067391362 (DE-599)DOAJf3713c90fa294b4491da0d0f1436ba64 DE-627 ger DE-627 rakwb eng QE351-399.2 Susannah M. Dorfman verfasserin aut Composition and Pressure Effects on Partitioning of Ferrous Iron in Iron-Rich Lower Mantle Heterogeneities 2021 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Both seismic observations of dense low shear velocity regions and models of magma ocean crystallization and mantle dynamics support enrichment of iron in Earth’s lowermost mantle. Physical properties of iron-rich lower mantle heterogeneities in the modern Earth depend on distribution of iron between coexisting lower mantle phases (Mg,Fe)O magnesiowüstite, (Mg,Fe)SiO<sub<3</sub< bridgmanite, and (Mg,Fe)SiO<sub<3</sub< post-perovskite. The partitioning of iron between these phases was investigated in synthetic ferrous-iron-rich olivine compositions (Mg<sub<0.55</sub<Fe<sub<0.45</sub<)<sub<2</sub<SiO<sub<4</sub< and (Mg<sub<0.28</sub<Fe<sub<0.72</sub<)<sub<2</sub<SiO<sub<4</sub< at lower mantle conditions ranging from 33–128 GPa and 1900–3000 K in the laser-heated diamond anvil cell. The resulting phase assemblages were characterized by a combination of in situ X-ray diffraction and ex situ transmission electron microscopy. The exchange coefficient between bridgmanite and magnesiowüstite decreases with pressure and bulk Fe# and increases with temperature. Thermodynamic modeling determines that incorporation and partitioning of iron in bridgmanite are explained well by excess volume associated with Mg-Fe exchange. Partitioning results are used to model compositions and densities of mantle phase assemblages as a function of pressure, FeO-content and SiO<sub<2</sub<-content. Unlike average mantle compositions, iron-rich compositions in the mantle exhibit negative dependence of density on SiO<sub<2</sub<-content at all mantle depths, an important finding for interpretation of deep lower mantle structures. iron partitioning lower mantle mantle heterogeneities laser-heated diamond anvil cell experimental petrology Mineralogy Farhang Nabiei verfasserin aut Charles-Edouard Boukaré verfasserin aut Vitali B. Prakapenka verfasserin aut Marco Cantoni verfasserin aut James Badro verfasserin aut Philippe Gillet verfasserin aut In Minerals MDPI AG, 2012 11(2021), 5, p 512 (DE-627)689132069 (DE-600)2655947-X 2075163X nnns volume:11 year:2021 number:5, p 512 https://doi.org/10.3390/min11050512 kostenfrei https://doaj.org/article/f3713c90fa294b4491da0d0f1436ba64 kostenfrei https://www.mdpi.com/2075-163X/11/5/512 kostenfrei https://doaj.org/toc/2075-163X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 11 2021 5, p 512
spelling	10.3390/min11050512 doi (DE-627)DOAJ067391362 (DE-599)DOAJf3713c90fa294b4491da0d0f1436ba64 DE-627 ger DE-627 rakwb eng QE351-399.2 Susannah M. Dorfman verfasserin aut Composition and Pressure Effects on Partitioning of Ferrous Iron in Iron-Rich Lower Mantle Heterogeneities 2021 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Both seismic observations of dense low shear velocity regions and models of magma ocean crystallization and mantle dynamics support enrichment of iron in Earth’s lowermost mantle. Physical properties of iron-rich lower mantle heterogeneities in the modern Earth depend on distribution of iron between coexisting lower mantle phases (Mg,Fe)O magnesiowüstite, (Mg,Fe)SiO<sub<3</sub< bridgmanite, and (Mg,Fe)SiO<sub<3</sub< post-perovskite. The partitioning of iron between these phases was investigated in synthetic ferrous-iron-rich olivine compositions (Mg<sub<0.55</sub<Fe<sub<0.45</sub<)<sub<2</sub<SiO<sub<4</sub< and (Mg<sub<0.28</sub<Fe<sub<0.72</sub<)<sub<2</sub<SiO<sub<4</sub< at lower mantle conditions ranging from 33–128 GPa and 1900–3000 K in the laser-heated diamond anvil cell. The resulting phase assemblages were characterized by a combination of in situ X-ray diffraction and ex situ transmission electron microscopy. The exchange coefficient between bridgmanite and magnesiowüstite decreases with pressure and bulk Fe# and increases with temperature. Thermodynamic modeling determines that incorporation and partitioning of iron in bridgmanite are explained well by excess volume associated with Mg-Fe exchange. Partitioning results are used to model compositions and densities of mantle phase assemblages as a function of pressure, FeO-content and SiO<sub<2</sub<-content. Unlike average mantle compositions, iron-rich compositions in the mantle exhibit negative dependence of density on SiO<sub<2</sub<-content at all mantle depths, an important finding for interpretation of deep lower mantle structures. iron partitioning lower mantle mantle heterogeneities laser-heated diamond anvil cell experimental petrology Mineralogy Farhang Nabiei verfasserin aut Charles-Edouard Boukaré verfasserin aut Vitali B. Prakapenka verfasserin aut Marco Cantoni verfasserin aut James Badro verfasserin aut Philippe Gillet verfasserin aut In Minerals MDPI AG, 2012 11(2021), 5, p 512 (DE-627)689132069 (DE-600)2655947-X 2075163X nnns volume:11 year:2021 number:5, p 512 https://doi.org/10.3390/min11050512 kostenfrei https://doaj.org/article/f3713c90fa294b4491da0d0f1436ba64 kostenfrei https://www.mdpi.com/2075-163X/11/5/512 kostenfrei https://doaj.org/toc/2075-163X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 11 2021 5, p 512
allfields_unstemmed	10.3390/min11050512 doi (DE-627)DOAJ067391362 (DE-599)DOAJf3713c90fa294b4491da0d0f1436ba64 DE-627 ger DE-627 rakwb eng QE351-399.2 Susannah M. Dorfman verfasserin aut Composition and Pressure Effects on Partitioning of Ferrous Iron in Iron-Rich Lower Mantle Heterogeneities 2021 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Both seismic observations of dense low shear velocity regions and models of magma ocean crystallization and mantle dynamics support enrichment of iron in Earth’s lowermost mantle. Physical properties of iron-rich lower mantle heterogeneities in the modern Earth depend on distribution of iron between coexisting lower mantle phases (Mg,Fe)O magnesiowüstite, (Mg,Fe)SiO<sub<3</sub< bridgmanite, and (Mg,Fe)SiO<sub<3</sub< post-perovskite. The partitioning of iron between these phases was investigated in synthetic ferrous-iron-rich olivine compositions (Mg<sub<0.55</sub<Fe<sub<0.45</sub<)<sub<2</sub<SiO<sub<4</sub< and (Mg<sub<0.28</sub<Fe<sub<0.72</sub<)<sub<2</sub<SiO<sub<4</sub< at lower mantle conditions ranging from 33–128 GPa and 1900–3000 K in the laser-heated diamond anvil cell. The resulting phase assemblages were characterized by a combination of in situ X-ray diffraction and ex situ transmission electron microscopy. The exchange coefficient between bridgmanite and magnesiowüstite decreases with pressure and bulk Fe# and increases with temperature. Thermodynamic modeling determines that incorporation and partitioning of iron in bridgmanite are explained well by excess volume associated with Mg-Fe exchange. Partitioning results are used to model compositions and densities of mantle phase assemblages as a function of pressure, FeO-content and SiO<sub<2</sub<-content. Unlike average mantle compositions, iron-rich compositions in the mantle exhibit negative dependence of density on SiO<sub<2</sub<-content at all mantle depths, an important finding for interpretation of deep lower mantle structures. iron partitioning lower mantle mantle heterogeneities laser-heated diamond anvil cell experimental petrology Mineralogy Farhang Nabiei verfasserin aut Charles-Edouard Boukaré verfasserin aut Vitali B. Prakapenka verfasserin aut Marco Cantoni verfasserin aut James Badro verfasserin aut Philippe Gillet verfasserin aut In Minerals MDPI AG, 2012 11(2021), 5, p 512 (DE-627)689132069 (DE-600)2655947-X 2075163X nnns volume:11 year:2021 number:5, p 512 https://doi.org/10.3390/min11050512 kostenfrei https://doaj.org/article/f3713c90fa294b4491da0d0f1436ba64 kostenfrei https://www.mdpi.com/2075-163X/11/5/512 kostenfrei https://doaj.org/toc/2075-163X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 11 2021 5, p 512
allfieldsGer	10.3390/min11050512 doi (DE-627)DOAJ067391362 (DE-599)DOAJf3713c90fa294b4491da0d0f1436ba64 DE-627 ger DE-627 rakwb eng QE351-399.2 Susannah M. Dorfman verfasserin aut Composition and Pressure Effects on Partitioning of Ferrous Iron in Iron-Rich Lower Mantle Heterogeneities 2021 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Both seismic observations of dense low shear velocity regions and models of magma ocean crystallization and mantle dynamics support enrichment of iron in Earth’s lowermost mantle. Physical properties of iron-rich lower mantle heterogeneities in the modern Earth depend on distribution of iron between coexisting lower mantle phases (Mg,Fe)O magnesiowüstite, (Mg,Fe)SiO<sub<3</sub< bridgmanite, and (Mg,Fe)SiO<sub<3</sub< post-perovskite. The partitioning of iron between these phases was investigated in synthetic ferrous-iron-rich olivine compositions (Mg<sub<0.55</sub<Fe<sub<0.45</sub<)<sub<2</sub<SiO<sub<4</sub< and (Mg<sub<0.28</sub<Fe<sub<0.72</sub<)<sub<2</sub<SiO<sub<4</sub< at lower mantle conditions ranging from 33–128 GPa and 1900–3000 K in the laser-heated diamond anvil cell. The resulting phase assemblages were characterized by a combination of in situ X-ray diffraction and ex situ transmission electron microscopy. The exchange coefficient between bridgmanite and magnesiowüstite decreases with pressure and bulk Fe# and increases with temperature. Thermodynamic modeling determines that incorporation and partitioning of iron in bridgmanite are explained well by excess volume associated with Mg-Fe exchange. Partitioning results are used to model compositions and densities of mantle phase assemblages as a function of pressure, FeO-content and SiO<sub<2</sub<-content. Unlike average mantle compositions, iron-rich compositions in the mantle exhibit negative dependence of density on SiO<sub<2</sub<-content at all mantle depths, an important finding for interpretation of deep lower mantle structures. iron partitioning lower mantle mantle heterogeneities laser-heated diamond anvil cell experimental petrology Mineralogy Farhang Nabiei verfasserin aut Charles-Edouard Boukaré verfasserin aut Vitali B. Prakapenka verfasserin aut Marco Cantoni verfasserin aut James Badro verfasserin aut Philippe Gillet verfasserin aut In Minerals MDPI AG, 2012 11(2021), 5, p 512 (DE-627)689132069 (DE-600)2655947-X 2075163X nnns volume:11 year:2021 number:5, p 512 https://doi.org/10.3390/min11050512 kostenfrei https://doaj.org/article/f3713c90fa294b4491da0d0f1436ba64 kostenfrei https://www.mdpi.com/2075-163X/11/5/512 kostenfrei https://doaj.org/toc/2075-163X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 11 2021 5, p 512
allfieldsSound	10.3390/min11050512 doi (DE-627)DOAJ067391362 (DE-599)DOAJf3713c90fa294b4491da0d0f1436ba64 DE-627 ger DE-627 rakwb eng QE351-399.2 Susannah M. Dorfman verfasserin aut Composition and Pressure Effects on Partitioning of Ferrous Iron in Iron-Rich Lower Mantle Heterogeneities 2021 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Both seismic observations of dense low shear velocity regions and models of magma ocean crystallization and mantle dynamics support enrichment of iron in Earth’s lowermost mantle. Physical properties of iron-rich lower mantle heterogeneities in the modern Earth depend on distribution of iron between coexisting lower mantle phases (Mg,Fe)O magnesiowüstite, (Mg,Fe)SiO<sub<3</sub< bridgmanite, and (Mg,Fe)SiO<sub<3</sub< post-perovskite. The partitioning of iron between these phases was investigated in synthetic ferrous-iron-rich olivine compositions (Mg<sub<0.55</sub<Fe<sub<0.45</sub<)<sub<2</sub<SiO<sub<4</sub< and (Mg<sub<0.28</sub<Fe<sub<0.72</sub<)<sub<2</sub<SiO<sub<4</sub< at lower mantle conditions ranging from 33–128 GPa and 1900–3000 K in the laser-heated diamond anvil cell. The resulting phase assemblages were characterized by a combination of in situ X-ray diffraction and ex situ transmission electron microscopy. The exchange coefficient between bridgmanite and magnesiowüstite decreases with pressure and bulk Fe# and increases with temperature. Thermodynamic modeling determines that incorporation and partitioning of iron in bridgmanite are explained well by excess volume associated with Mg-Fe exchange. Partitioning results are used to model compositions and densities of mantle phase assemblages as a function of pressure, FeO-content and SiO<sub<2</sub<-content. Unlike average mantle compositions, iron-rich compositions in the mantle exhibit negative dependence of density on SiO<sub<2</sub<-content at all mantle depths, an important finding for interpretation of deep lower mantle structures. iron partitioning lower mantle mantle heterogeneities laser-heated diamond anvil cell experimental petrology Mineralogy Farhang Nabiei verfasserin aut Charles-Edouard Boukaré verfasserin aut Vitali B. Prakapenka verfasserin aut Marco Cantoni verfasserin aut James Badro verfasserin aut Philippe Gillet verfasserin aut In Minerals MDPI AG, 2012 11(2021), 5, p 512 (DE-627)689132069 (DE-600)2655947-X 2075163X nnns volume:11 year:2021 number:5, p 512 https://doi.org/10.3390/min11050512 kostenfrei https://doaj.org/article/f3713c90fa294b4491da0d0f1436ba64 kostenfrei https://www.mdpi.com/2075-163X/11/5/512 kostenfrei https://doaj.org/toc/2075-163X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 11 2021 5, p 512
language	English
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author	Susannah M. Dorfman
spellingShingle	Susannah M. Dorfman misc QE351-399.2 misc iron partitioning misc lower mantle misc mantle heterogeneities misc laser-heated diamond anvil cell misc experimental petrology misc Mineralogy Composition and Pressure Effects on Partitioning of Ferrous Iron in Iron-Rich Lower Mantle Heterogeneities
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topic_title	QE351-399.2 Composition and Pressure Effects on Partitioning of Ferrous Iron in Iron-Rich Lower Mantle Heterogeneities iron partitioning lower mantle mantle heterogeneities laser-heated diamond anvil cell experimental petrology
topic	misc QE351-399.2 misc iron partitioning misc lower mantle misc mantle heterogeneities misc laser-heated diamond anvil cell misc experimental petrology misc Mineralogy
topic_unstemmed	misc QE351-399.2 misc iron partitioning misc lower mantle misc mantle heterogeneities misc laser-heated diamond anvil cell misc experimental petrology misc Mineralogy
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title	Composition and Pressure Effects on Partitioning of Ferrous Iron in Iron-Rich Lower Mantle Heterogeneities
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title_full	Composition and Pressure Effects on Partitioning of Ferrous Iron in Iron-Rich Lower Mantle Heterogeneities
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title_sort	composition and pressure effects on partitioning of ferrous iron in iron-rich lower mantle heterogeneities
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title_auth	Composition and Pressure Effects on Partitioning of Ferrous Iron in Iron-Rich Lower Mantle Heterogeneities
abstract	Both seismic observations of dense low shear velocity regions and models of magma ocean crystallization and mantle dynamics support enrichment of iron in Earth’s lowermost mantle. Physical properties of iron-rich lower mantle heterogeneities in the modern Earth depend on distribution of iron between coexisting lower mantle phases (Mg,Fe)O magnesiowüstite, (Mg,Fe)SiO<sub<3</sub< bridgmanite, and (Mg,Fe)SiO<sub<3</sub< post-perovskite. The partitioning of iron between these phases was investigated in synthetic ferrous-iron-rich olivine compositions (Mg<sub<0.55</sub<Fe<sub<0.45</sub<)<sub<2</sub<SiO<sub<4</sub< and (Mg<sub<0.28</sub<Fe<sub<0.72</sub<)<sub<2</sub<SiO<sub<4</sub< at lower mantle conditions ranging from 33–128 GPa and 1900–3000 K in the laser-heated diamond anvil cell. The resulting phase assemblages were characterized by a combination of in situ X-ray diffraction and ex situ transmission electron microscopy. The exchange coefficient between bridgmanite and magnesiowüstite decreases with pressure and bulk Fe# and increases with temperature. Thermodynamic modeling determines that incorporation and partitioning of iron in bridgmanite are explained well by excess volume associated with Mg-Fe exchange. Partitioning results are used to model compositions and densities of mantle phase assemblages as a function of pressure, FeO-content and SiO<sub<2</sub<-content. Unlike average mantle compositions, iron-rich compositions in the mantle exhibit negative dependence of density on SiO<sub<2</sub<-content at all mantle depths, an important finding for interpretation of deep lower mantle structures.
abstractGer	Both seismic observations of dense low shear velocity regions and models of magma ocean crystallization and mantle dynamics support enrichment of iron in Earth’s lowermost mantle. Physical properties of iron-rich lower mantle heterogeneities in the modern Earth depend on distribution of iron between coexisting lower mantle phases (Mg,Fe)O magnesiowüstite, (Mg,Fe)SiO<sub<3</sub< bridgmanite, and (Mg,Fe)SiO<sub<3</sub< post-perovskite. The partitioning of iron between these phases was investigated in synthetic ferrous-iron-rich olivine compositions (Mg<sub<0.55</sub<Fe<sub<0.45</sub<)<sub<2</sub<SiO<sub<4</sub< and (Mg<sub<0.28</sub<Fe<sub<0.72</sub<)<sub<2</sub<SiO<sub<4</sub< at lower mantle conditions ranging from 33–128 GPa and 1900–3000 K in the laser-heated diamond anvil cell. The resulting phase assemblages were characterized by a combination of in situ X-ray diffraction and ex situ transmission electron microscopy. The exchange coefficient between bridgmanite and magnesiowüstite decreases with pressure and bulk Fe# and increases with temperature. Thermodynamic modeling determines that incorporation and partitioning of iron in bridgmanite are explained well by excess volume associated with Mg-Fe exchange. Partitioning results are used to model compositions and densities of mantle phase assemblages as a function of pressure, FeO-content and SiO<sub<2</sub<-content. Unlike average mantle compositions, iron-rich compositions in the mantle exhibit negative dependence of density on SiO<sub<2</sub<-content at all mantle depths, an important finding for interpretation of deep lower mantle structures.
abstract_unstemmed	Both seismic observations of dense low shear velocity regions and models of magma ocean crystallization and mantle dynamics support enrichment of iron in Earth’s lowermost mantle. Physical properties of iron-rich lower mantle heterogeneities in the modern Earth depend on distribution of iron between coexisting lower mantle phases (Mg,Fe)O magnesiowüstite, (Mg,Fe)SiO<sub<3</sub< bridgmanite, and (Mg,Fe)SiO<sub<3</sub< post-perovskite. The partitioning of iron between these phases was investigated in synthetic ferrous-iron-rich olivine compositions (Mg<sub<0.55</sub<Fe<sub<0.45</sub<)<sub<2</sub<SiO<sub<4</sub< and (Mg<sub<0.28</sub<Fe<sub<0.72</sub<)<sub<2</sub<SiO<sub<4</sub< at lower mantle conditions ranging from 33–128 GPa and 1900–3000 K in the laser-heated diamond anvil cell. The resulting phase assemblages were characterized by a combination of in situ X-ray diffraction and ex situ transmission electron microscopy. The exchange coefficient between bridgmanite and magnesiowüstite decreases with pressure and bulk Fe# and increases with temperature. Thermodynamic modeling determines that incorporation and partitioning of iron in bridgmanite are explained well by excess volume associated with Mg-Fe exchange. Partitioning results are used to model compositions and densities of mantle phase assemblages as a function of pressure, FeO-content and SiO<sub<2</sub<-content. Unlike average mantle compositions, iron-rich compositions in the mantle exhibit negative dependence of density on SiO<sub<2</sub<-content at all mantle depths, an important finding for interpretation of deep lower mantle structures.
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title_short	Composition and Pressure Effects on Partitioning of Ferrous Iron in Iron-Rich Lower Mantle Heterogeneities
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author2	Farhang Nabiei Charles-Edouard Boukaré Vitali B. Prakapenka Marco Cantoni James Badro Philippe Gillet
author2Str	Farhang Nabiei Charles-Edouard Boukaré Vitali B. Prakapenka Marco Cantoni James Badro Philippe Gillet
ppnlink	689132069
callnumber-subject	QE - Geology
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doi_str	10.3390/min11050512
callnumber-a	QE351-399.2
up_date	2024-07-04T00:42:42.879Z
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Composition and Pressure Effects on Partitioning of Ferrous Iron in Iron-Rich Lower Mantle Heterogeneities

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