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Article: M1 site splitting due to next nearest neighbor effects and ferric iron in tetrahedral site in clinopyroxene megacrysts

TitleM1 site splitting due to next nearest neighbor effects and ferric iron in tetrahedral site in clinopyroxene megacrysts
Authors
Issue Date1998
Citation
Chinese Journal Of Geochemistry, 1998, v. 17 n. 2, p. 135-141 How to Cite?
AbstractIt is well known that in pyroxene structure, there are two metal sites, M1 and M2. Generally speaking, ferrous iron in each of these sites would normally be expected to give rise to a doublet. However, anomalies have been found in the relative areas of the peaks in the room temperature spectra of some clinopyroxene (CPX) when the above assignment is followed. According to the calculation of Next Nearest Neighbor configurations of divalent cations in M1, we found that the four configurations of M1 can be divided into two groups. One group is 3Ca configuration that increases with the content of Ca (p.f.u.); the other group is made up of three No-3Ca configurations that decrease with the content of Ca. The two groups contribute to the spectrum structure of M1, so in this study we fit two doublets for ferrous iron in M1. Though there were several reports on Fe3+ in tetrahedral site previously, it was not sure that Fe3+ occupies the T site is an universal fact in CPX, despite of the content of Al. We found that the Fe3+ in the T site fitted by Mossbauer spectroscopy is negatively correlated to the Si content in the T site and positively correlated to the Fe3+ in the T site estimated on the supposition that Fe3+ and Al occupy the T site randomly. If it is true, it is important in the modeling of ion exchange geobarometries and geothermometries.
Persistent Identifierhttp://hdl.handle.net/10722/150996
ISSN
2015 SCImago Journal Rankings: 0.180
References

 

DC FieldValueLanguage
dc.contributor.authorLi, Yen_US
dc.contributor.authorLi, Yen_US
dc.contributor.authorZhi, Xen_US
dc.date.accessioned2012-06-26T06:15:40Z-
dc.date.available2012-06-26T06:15:40Z-
dc.date.issued1998en_US
dc.identifier.citationChinese Journal Of Geochemistry, 1998, v. 17 n. 2, p. 135-141en_US
dc.identifier.issn1000-9426en_US
dc.identifier.urihttp://hdl.handle.net/10722/150996-
dc.description.abstractIt is well known that in pyroxene structure, there are two metal sites, M1 and M2. Generally speaking, ferrous iron in each of these sites would normally be expected to give rise to a doublet. However, anomalies have been found in the relative areas of the peaks in the room temperature spectra of some clinopyroxene (CPX) when the above assignment is followed. According to the calculation of Next Nearest Neighbor configurations of divalent cations in M1, we found that the four configurations of M1 can be divided into two groups. One group is 3Ca configuration that increases with the content of Ca (p.f.u.); the other group is made up of three No-3Ca configurations that decrease with the content of Ca. The two groups contribute to the spectrum structure of M1, so in this study we fit two doublets for ferrous iron in M1. Though there were several reports on Fe3+ in tetrahedral site previously, it was not sure that Fe3+ occupies the T site is an universal fact in CPX, despite of the content of Al. We found that the Fe3+ in the T site fitted by Mossbauer spectroscopy is negatively correlated to the Si content in the T site and positively correlated to the Fe3+ in the T site estimated on the supposition that Fe3+ and Al occupy the T site randomly. If it is true, it is important in the modeling of ion exchange geobarometries and geothermometries.en_US
dc.languageengen_US
dc.relation.ispartofChinese Journal of Geochemistryen_US
dc.titleM1 site splitting due to next nearest neighbor effects and ferric iron in tetrahedral site in clinopyroxene megacrystsen_US
dc.typeArticleen_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-0031692131en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0031692131&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume17en_US
dc.identifier.issue2en_US
dc.identifier.spage135en_US
dc.identifier.epage141en_US
dc.publisher.placeChinaen_US

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