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Article: Mössbauer spectroscopy of omphacite and garnet pairs from eclogites: Application to geothermobarometry

TitleMössbauer spectroscopy of omphacite and garnet pairs from eclogites: Application to geothermobarometry
Authors
Issue Date2005
PublisherMineralogical Society of America. The Journal's web site is located at http://www.minsocam.org/MSA/AmMin/AmMineral.html
Citation
American Mineralogist, 2005, v. 90 n. 1, p. 90-100 How to Cite?
AbstractCation partition among coexisting minerals has been widely applied to eclogite thermometry, but an accurate estimation of Fe3+ content compared to total Fe is crucial in obtaining reasonable temperatures for petrologic studies. Room-temperature Mössbauer spectroscopy was measured for garnet-omphacite pairs in high-pressure (HP) and ultrahigh-pressure (UHP) eclogites from the Dabie terrane in east-central China. The results show very low Fe3+/ΣFe ratios of 0.026 to 0.082 in garnet but high Fe3+/ΣFe ratios of 0.240 to 0.689 in omphacite. The hyperfine parameters of minerals record the HP-UHP conditions that the eclogites experienced. Fe2+ in clinopyroxenes with low Na + Ca contents in their M2 sites shows pressure-induced occupation in M1 site. The quadrupole splitting of Fe2+ in HP-UHP garnets (3.61 to 3.77 mm/s) and omphacites (2.77 to 3.06 mm/s) are among the highest values ever reported, indicating effectively pressure-regulated polyhedral sites. After the Fe3+ was corrected, Fe2+-Mg partitioning not only significantly narrow the ranges relative to those without Fe 3+ correction, but also yield temperatures about 8 to 370 °C lower than the uncorrected temperatures for the same garnet-pyroxene pairs. The recalculated temperatures are constrained to narrow ranges of 477 to 647 °C for quartz-bearing eclogites and 624 to 843 °C for coesite-bearing eclogites. These maximum values provide close proxies to peak metamorphic temperatures provided that the retrograde exchange of Fe-Mg cations by diffusion between minerals during exhumation is taken into account.
Persistent Identifierhttp://hdl.handle.net/10722/91300
ISSN
2015 Impact Factor: 1.918
2015 SCImago Journal Rankings: 1.185
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLi, YLen_HK
dc.contributor.authorZheng, YFen_HK
dc.contributor.authorFu, Ben_HK
dc.date.accessioned2010-09-17T10:16:34Z-
dc.date.available2010-09-17T10:16:34Z-
dc.date.issued2005en_HK
dc.identifier.citationAmerican Mineralogist, 2005, v. 90 n. 1, p. 90-100en_HK
dc.identifier.issn0003-004Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/91300-
dc.description.abstractCation partition among coexisting minerals has been widely applied to eclogite thermometry, but an accurate estimation of Fe3+ content compared to total Fe is crucial in obtaining reasonable temperatures for petrologic studies. Room-temperature Mössbauer spectroscopy was measured for garnet-omphacite pairs in high-pressure (HP) and ultrahigh-pressure (UHP) eclogites from the Dabie terrane in east-central China. The results show very low Fe3+/ΣFe ratios of 0.026 to 0.082 in garnet but high Fe3+/ΣFe ratios of 0.240 to 0.689 in omphacite. The hyperfine parameters of minerals record the HP-UHP conditions that the eclogites experienced. Fe2+ in clinopyroxenes with low Na + Ca contents in their M2 sites shows pressure-induced occupation in M1 site. The quadrupole splitting of Fe2+ in HP-UHP garnets (3.61 to 3.77 mm/s) and omphacites (2.77 to 3.06 mm/s) are among the highest values ever reported, indicating effectively pressure-regulated polyhedral sites. After the Fe3+ was corrected, Fe2+-Mg partitioning not only significantly narrow the ranges relative to those without Fe 3+ correction, but also yield temperatures about 8 to 370 °C lower than the uncorrected temperatures for the same garnet-pyroxene pairs. The recalculated temperatures are constrained to narrow ranges of 477 to 647 °C for quartz-bearing eclogites and 624 to 843 °C for coesite-bearing eclogites. These maximum values provide close proxies to peak metamorphic temperatures provided that the retrograde exchange of Fe-Mg cations by diffusion between minerals during exhumation is taken into account.en_HK
dc.languageengen_HK
dc.publisherMineralogical Society of America. The Journal's web site is located at http://www.minsocam.org/MSA/AmMin/AmMineral.htmlen_HK
dc.relation.ispartofAmerican Mineralogisten_HK
dc.titleMössbauer spectroscopy of omphacite and garnet pairs from eclogites: Application to geothermobarometryen_HK
dc.typeArticleen_HK
dc.identifier.emailLi, YL:yiliang@hkucc.hku.hken_HK
dc.identifier.authorityLi, YL=rp01354en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.2138/am.2005.1400en_HK
dc.identifier.scopuseid_2-s2.0-12444330397en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-12444330397&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume90en_HK
dc.identifier.issue1en_HK
dc.identifier.spage90en_HK
dc.identifier.epage100en_HK
dc.identifier.isiWOS:000226318500011-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridLi, YL=27171876700en_HK
dc.identifier.scopusauthoridZheng, YF=7404838286en_HK
dc.identifier.scopusauthoridFu, B=35960736900en_HK

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