Oxygen isotope geochemistry of pyroclastic clinopyroxene monitors carbonate contributions to Roman-type ultrapotassic magmas (Articolo in rivista)

Type

• Prodotto della ricerca (Classe)
• Articolo in rivista (Classe)

Label

• Oxygen isotope geochemistry of pyroclastic clinopyroxene monitors carbonate contributions to Roman-type ultrapotassic magmas (Articolo in rivista) (literal)

Anno

• 2004-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

• 10.1007/s00410-004-0602-2 (literal)

Alternative label

• Dallai L.; Freda C.M.; Gaeta M.; (2004)
  Oxygen isotope geochemistry of pyroclastic clinopyroxene monitors carbonate contributions to Roman-type ultrapotassic magmas
  in Contributions to mineralogy and petrology
  (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

• Dallai L.; Freda C.M.; Gaeta M.; (literal)

Pagina inizio

• 247 (literal)

Pagina fine

• 263 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

• 148 (literal)

Rivista

• Contributions to mineralogy and petrology (Rivista)

Note

• ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

• CNR, Ist Geosci & Georisorse, Area Ric Pisa, I-56127 Pisa, Italy; Ist Nazl Geofis & Vulcanol, Rome, Italy; Univ Roma La Sapienza, Dipartimento Sci Terra, Rome, Italy; (literal)

Titolo

• Oxygen isotope geochemistry of pyroclastic clinopyroxene monitors carbonate contributions to Roman-type ultrapotassic magmas (literal)

Abstract

• The oxygen isotope geochemistry and chemical composition of clinopyroxene crystals from Alban Hills pyroclastic deposits constrain the petrological evolution of ultrapotassic Roman-type rocks. Volcanic eruptions in the 560–35 ka time interval produced thick pyroclastic deposits bearing clinopyroxene phenocrysts with recurrent chemical characteristics. Clinopyroxenes vary from Si–Mg-rich to Al–Fe-rich with no compositional break, indicating that they were derived from a continuous process of crystal fractionation. Based on the delta18O and trace element data no primitive samples were recovered: monomineralic clinopyroxene cumulates set the oxygen isotope composition of primary magmas in the range of uncontaminated mantle rocks (5.5‰), but their SigmaREE composition resulted from extensive crystal fractionation. Departing from these mantle-like delta18OCpx values the effects of crustal contamination of clinopyroxene O-isotope composition were identified and used to monitor chemical variations in the parental magma. delta18O values in Si–Mg-rich clinopyroxene are slightly higher than typical mantle values (5.9–6.2‰), and the low SigmaREE contents are representative of early stages of magmatic differentiation. Delta18O values as high as 8.2‰ are associated with Al–Fe3+-rich clinopyroxene showing high SigmaREE contents. These delta18O values are characteristic of crystals formed during the late magmatic stages of each main eruptive phase. Geochemical modelling of delta18O values vs. trace element contents indicates that these ultrapotassic magmas were derived from fractional crystallization plus assimilation of limited amounts of carbonate wall rocks starting from a primary melt, and from interaction with CO2 derived from country rocks during crystal fractionation. (literal)

Prodotto di

• Istituto di geoscienze e georisorse (IGG) (Istituto)
• Institute of environmental geology and geoengineering (IGAG) (Istituto)
• Geotermia e sequestro di CO2 (TA.P04.003.002) (Modulo)
• Studio delle interazioni tra fluidi e solidi nei processi di metasomatismo del mantello e nella genesi ed evoluzione dei magmi. (TA.P05.025.007) (Modulo)

Autore CNR

• LUIGI DALLAI (Persona)

Insieme di parole chiave

• Parole chiave di "Oxygen isotope geochemistry of pyroclastic clinopyroxene monitors carbonate contributions to Roman-type ultrapotassic magmas" (Insieme di parole chiave)

Incoming links:

Prodotto

• Institute of environmental geology and geoengineering (IGAG) (Istituto)
• Istituto di geoscienze e georisorse (IGG) (Istituto)
• Studio delle interazioni tra fluidi e solidi nei processi di metasomatismo del mantello e nella genesi ed evoluzione dei magmi. (TA.P05.025.007) (Modulo)
• Geotermia e sequestro di CO2 (TA.P04.003.002) (Modulo)

Autore CNR di

• LUIGI DALLAI (Persona)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi

• Contributions to mineralogy and petrology (Rivista)

Insieme di parole chiave di

• Parole chiave di "Oxygen isotope geochemistry of pyroclastic clinopyroxene monitors carbonate contributions to Roman-type ultrapotassic magmas" (Insieme di parole chiave)