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Article: Mössbauer spectroscopy of omphacite and garnet pairs from eclogites: Application to geothermobarometry
Title | Mössbauer spectroscopy of omphacite and garnet pairs from eclogites: Application to geothermobarometry |
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Authors | |
Issue Date | 2005 |
Publisher | Mineralogical 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? |
Abstract | Cation 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 Identifier | http://hdl.handle.net/10722/91300 |
ISSN | 2023 Impact Factor: 2.7 2023 SCImago Journal Rankings: 1.111 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Li, YL | en_HK |
dc.contributor.author | Zheng, YF | en_HK |
dc.contributor.author | Fu, B | en_HK |
dc.date.accessioned | 2010-09-17T10:16:34Z | - |
dc.date.available | 2010-09-17T10:16:34Z | - |
dc.date.issued | 2005 | en_HK |
dc.identifier.citation | American Mineralogist, 2005, v. 90 n. 1, p. 90-100 | en_HK |
dc.identifier.issn | 0003-004X | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/91300 | - |
dc.description.abstract | Cation 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.language | eng | en_HK |
dc.publisher | Mineralogical Society of America. The Journal's web site is located at http://www.minsocam.org/MSA/AmMin/AmMineral.html | en_HK |
dc.relation.ispartof | American Mineralogist | en_HK |
dc.title | Mössbauer spectroscopy of omphacite and garnet pairs from eclogites: Application to geothermobarometry | en_HK |
dc.type | Article | en_HK |
dc.identifier.email | Li, YL:yiliang@hkucc.hku.hk | en_HK |
dc.identifier.authority | Li, YL=rp01354 | en_HK |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.2138/am.2005.1400 | en_HK |
dc.identifier.scopus | eid_2-s2.0-12444330397 | en_HK |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-12444330397&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 90 | en_HK |
dc.identifier.issue | 1 | en_HK |
dc.identifier.spage | 90 | en_HK |
dc.identifier.epage | 100 | en_HK |
dc.identifier.isi | WOS:000226318500011 | - |
dc.publisher.place | United States | en_HK |
dc.identifier.scopusauthorid | Li, YL=27171876700 | en_HK |
dc.identifier.scopusauthorid | Zheng, YF=7404838286 | en_HK |
dc.identifier.scopusauthorid | Fu, B=35960736900 | en_HK |
dc.identifier.issnl | 0003-004X | - |