Sm-Nd isotope systematics of high-REE accessory minerals and major phases: ID-TIMS, LA-ICP-MS and EPMA data constrain multiple Permian-Triassic pegmatite emplacement in the Koralpe, Eastern Alps. (Articolo in rivista)

Type

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

Label

• Sm-Nd isotope systematics of high-REE accessory minerals and major phases: ID-TIMS, LA-ICP-MS and EPMA data constrain multiple Permian-Triassic pegmatite emplacement in the Koralpe, Eastern Alps. (Articolo in rivista) (literal)

Anno

• 2008-01-01T00:00:00+01:00 (literal)

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

• 10.1016/j.chemgeo.2008.03.008 (literal)

Alternative label

• Thöni M.; Miller C.; Zanetti A.; Habler G.; Goessler W. (2008)
  Sm-Nd isotope systematics of high-REE accessory minerals and major phases: ID-TIMS, LA-ICP-MS and EPMA data constrain multiple Permian-Triassic pegmatite emplacement in the Koralpe, Eastern Alps.
  in Chemical geology
  (literal)

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

• Thöni M.; Miller C.; Zanetti A.; Habler G.; Goessler W. (literal)

Pagina inizio

• 216 (literal)

Pagina fine

• 237 (literal)

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

• 254 (literal)

Rivista

• Chemical geology (Rivista)

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

• 22 (literal)

Note

• ISI Web of Science (WOS) (literal)

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

• Thöni M. a; Miller C. b; Zanetti A. c; Habler G. a; Goessler W. d: a Center for Earth Sciences, Althanstrasse 14, A-1090 Wien, Austria; b Institute of Mineralogy and Petrography, Innrain 52, A-6020 Innsbruck, Austria; c CNR-Istituto di Geoscienze e Georisorse, via Ferrata 1, I-27100 Pavia, Italy; d Institute of Analytical Chemistry, Universitätsplatz 1, A-8010-Graz, Austria (literal)

Titolo

• Sm-Nd isotope systematics of high-REE accessory minerals and major phases: ID-TIMS, LA-ICP-MS and EPMA data constrain multiple Permian-Triassic pegmatite emplacement in the Koralpe, Eastern Alps. (literal)

Abstract

• Detailed Sm-Nd mineral ID-TIMS, EMPA and LA-ICP-MS analysis of meta-pegmatite minerals from the Koralpe-Stubalpe area, Austria, involving single crystal separation, step-wise dissolution and acid leaching techniques, yielded (i) information about the partitioning of REE between accessory and major mineral phases in meta-pegmatites, and (ii) age constraints on the long-lasting \"Permian-Triassic event\" in the Austroalpine basement units of the Eastern Alps. Internal Sm-Ndmineral isochrons performed on porphyroclast domains from the three localities Rostockbach, Kuppergrund and Wildbachgraben, including garnet, xenotime, apatite, monazite and feldspar indicate multiple emplacement of pegmatoid melts between 273±2 and 258±3 Ma. Other localities yielded younger ages, indicating that magmatic garnet crystallisation persisted from 251±7 to c. 230 Ma. Ages calculated between high-REE accessories (monazite, apatite, xenotime) and the low-REE major phases feldspar and garnet are largely consistent. Zircon, however, plots clearly off the internal regression line. H2SO4 leaching experiments on meta-pegmatite garnet rich in micron-sized xenotime and apatite inclusions, locally affected by dynamic recrystallisation, yielded information about the behaviour of the Sm-Nd system during strong tectono-metamorphic overprinting. The data suggest multiple injections of pegmatite melts, at distinctly different times, during protracted crustal thinning and heating in the Permian-Triassic. Ky-paramorphs after andalusite, and micro-inclusions of kyanite, staurolite and sillimanite in magmatic garnet indicate crystallization of the garnet at moderately high, but variable pressure conditions. During subsequent eclogite-facies overprinting (peak PT c. 700 °C/2.2 GPa) and intense deformation in Cretaceous time, the magmatic chemical and isotopic signatures of porphyroclasts were largely preserved, except for localized within-grain micro-shear zones and outermost rim domains, whereas part of the feldspar-rich matrix recrystallised during pervasive mylonitisation along the eclogite- to amphibolite-facies-grade exhumation path. (literal)

Prodotto di

• Istituto di geoscienze e georisorse (IGG) (Istituto)
• Metodologie integrate per la conoscenza di processi e materiali geologici e del loro impatto sull'uomo e l'ambiente (TA.P04.014.002) (Modulo)

Autore CNR

• ALBERTO ZANETTI (Persona)

Insieme di parole chiave

• Keywords of "Sm-Nd isotope systematics of high-REE accessory minerals and major phases: ID-TIMS, LA-ICP-MS and EPMA data constrain multiple Permian-Triassic pegmatite emplacement in the Koralpe, Eastern Alps." (Insieme di parole chiave)

Incoming links:

Prodotto

• Istituto di geoscienze e georisorse (IGG) (Istituto)
• Metodologie integrate per la conoscenza di processi e materiali geologici e del loro impatto sull'uomo e l'ambiente (TA.P04.014.002) (Modulo)

Autore CNR di

• ALBERTO ZANETTI (Persona)

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

• Chemical geology (Rivista)

Insieme di parole chiave di

• Keywords of "Sm-Nd isotope systematics of high-REE accessory minerals and major phases: ID-TIMS, LA-ICP-MS and EPMA data constrain multiple Permian-Triassic pegmatite emplacement in the Koralpe, Eastern Alps." (Insieme di parole chiave)