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Article: Mineral/melt partition coefficients of oceanic alkali basalts determined on natural samples using laser ablation-inductively coupled plasma-mass spectrometry (LAM-ICP-MS)

TitleMineral/melt partition coefficients of oceanic alkali basalts determined on natural samples using laser ablation-inductively coupled plasma-mass spectrometry (LAM-ICP-MS)
Authors
KeywordsLaser-Ablation Inductively Coupled Plasma Mass Spectrometry
Oceanic Basalts
Partition Coefficients
Issue Date2000
Citation
Mineralogical Magazine, 2000, v. 64 n. 1, p. 85-94 How to Cite?
AbstractIn order to limit the range of possible differentiation mechanisms and the impact of these processes on the trace element signatures of igneous suites, it is important to be able to predict or model the compositional evolution of the primary and/or parental magmas. Part of the problem in understanding these relationships in basalts from ocean islands is the paucity of reliable trace element mineral/melt partition coefficients, particularly for undersaturated magmas. Consequently, we have measured mineral/groundmass partition coefficients for Rb, Sr, Y, Zr, Nb, Hf, Ta, Th and REE, in situ, in clinopyroxene, Fe-Ti oxides and olivine in primitive basalts from Rarotonga, Cook Islands using LAM-ICP-MS. Analyses of these mafic rocks show high concentrations of most incompatible trace elements (e.g. Sr, Th, Y, REE, etc.) in pyroxenes relative to the other phases, suggesting that fractionation of pyroxenes was the dominant factor in the distribution of these trace elements during crystal fractionation. In such cases, the highly incompatible elements (D <0.01) are Ba, Cs and Nb. Elements that could also be classified as strongly incompatible (D <0.1) are Rb, Ta and Th. The remaining trace elements have bulk partition coefficient values that range from ~0.1 up to ~0.8 (Sr, Hf, Zr, Y and REE). Magnetites incorporate greater amounts of Nb and Ta than the titanaugites, and any significant fractionation of magnetite would have affected the bulk distribution of Nb and Ta. The LREE have lower Kd values than other REE, with the HREE having Kd values close to unity. Consequently, with the separation of titanaugite an overall enrichment of REE in the residual liquid with an increase in the La/Yb ratio is produced.
Persistent Identifierhttp://hdl.handle.net/10722/178217
ISSN
2015 Impact Factor: 2.212
2015 SCImago Journal Rankings: 0.592
References

 

DC FieldValueLanguage
dc.contributor.authorThompson, GMen_US
dc.contributor.authorMalpas, Jen_US
dc.date.accessioned2012-12-19T09:43:28Z-
dc.date.available2012-12-19T09:43:28Z-
dc.date.issued2000en_US
dc.identifier.citationMineralogical Magazine, 2000, v. 64 n. 1, p. 85-94en_US
dc.identifier.issn0026-461Xen_US
dc.identifier.urihttp://hdl.handle.net/10722/178217-
dc.description.abstractIn order to limit the range of possible differentiation mechanisms and the impact of these processes on the trace element signatures of igneous suites, it is important to be able to predict or model the compositional evolution of the primary and/or parental magmas. Part of the problem in understanding these relationships in basalts from ocean islands is the paucity of reliable trace element mineral/melt partition coefficients, particularly for undersaturated magmas. Consequently, we have measured mineral/groundmass partition coefficients for Rb, Sr, Y, Zr, Nb, Hf, Ta, Th and REE, in situ, in clinopyroxene, Fe-Ti oxides and olivine in primitive basalts from Rarotonga, Cook Islands using LAM-ICP-MS. Analyses of these mafic rocks show high concentrations of most incompatible trace elements (e.g. Sr, Th, Y, REE, etc.) in pyroxenes relative to the other phases, suggesting that fractionation of pyroxenes was the dominant factor in the distribution of these trace elements during crystal fractionation. In such cases, the highly incompatible elements (D <0.01) are Ba, Cs and Nb. Elements that could also be classified as strongly incompatible (D <0.1) are Rb, Ta and Th. The remaining trace elements have bulk partition coefficient values that range from ~0.1 up to ~0.8 (Sr, Hf, Zr, Y and REE). Magnetites incorporate greater amounts of Nb and Ta than the titanaugites, and any significant fractionation of magnetite would have affected the bulk distribution of Nb and Ta. The LREE have lower Kd values than other REE, with the HREE having Kd values close to unity. Consequently, with the separation of titanaugite an overall enrichment of REE in the residual liquid with an increase in the La/Yb ratio is produced.en_US
dc.languageengen_US
dc.relation.ispartofMineralogical Magazineen_US
dc.subjectLaser-Ablation Inductively Coupled Plasma Mass Spectrometryen_US
dc.subjectOceanic Basaltsen_US
dc.subjectPartition Coefficientsen_US
dc.titleMineral/melt partition coefficients of oceanic alkali basalts determined on natural samples using laser ablation-inductively coupled plasma-mass spectrometry (LAM-ICP-MS)en_US
dc.typeArticleen_US
dc.identifier.emailMalpas, J: jgmalpas@hku.hken_US
dc.identifier.authorityMalpas, J=rp00059en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-0034111050en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0034111050&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume64en_US
dc.identifier.issue1en_US
dc.identifier.spage85en_US
dc.identifier.epage94en_US
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridThompson, GM=7403078084en_US
dc.identifier.scopusauthoridMalpas, J=7006136845en_US

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