Matches in SemOpenAlex for { <https://semopenalex.org/work/W4322005008> ?p ?o ?g. }
Showing items 1 to 56 of
56
with 100 items per page.
- W4322005008 abstract "The affiliation of the Ennstal Phyllite Zone (EPZ) to either the micaschist units of the Koralpe-Wölz nappe system (KW-NS) to its south or to nappes of the “Greywacke Zone” to its north and east is still debated. Due to similarities with phyllites of the “Greywacke Zone” in the north and phyllonitic micaschists in the south, no clear lithological boundary between these units is observable. Petrographic observations suggest a continuous eoalpine metamorphic gradient with no metamorphic gap between the KW-NS and the EPZ. In order to clear this debate and further constrain the tectonic and temporal evolution of these units, we present new LA-MC-ICP-MS U/Pb age dating results for metapelite samples from the EPZ as well as for the adjacent units of the KW-NS.Two samples (EA09 and SP02) from the central EPZ and one sample (SP62) from the northernmost part of the Wölz-Complex of the KW-NS were selected for detrital zircon age dating. The distribution of approximately 150 dates per sample reveals major peaks at the Ediacaran-Cryogenian boundary (624 – 646 Ma), a smaller peak at the Neoproterozoic-Mesoproterozoic boundary (~1000 Ma) followed by a hiatus and a smaller peak in the mid-Paleoproterozoic (~2000 Ma). All samples show similar mid-Paleoproterozoic and Neoproterozoic-Mesoproterozoic peaks. Sample SP62 contains one grain of Cambrian age (523 Ma) and one grain of mid-Ordovician age (460 Ma) whereas the youngest zircons from the EPZ samples yield Ediacaran ages of 629 Ma and 625 Ma. The lack of zircons of Ordovician age in samples EA09 and SP02 indicate an affiliation of the EPZ with the basal units of the “Greywacke Zone”.We also dated metamorphic allanite and REE-bearing epidote rims which are interpreted to form at low pressure and temperature conditions in metapelites. Allanites from the EPZ yield metamorphic ages of 105 ± 3.5 Ma in the northern part of the unit and 279 ± 6 Ma in the southern part. Allanite cores from two micaschist samples from the northern and central Wölz-Complex yield ages of 316 ± 21 Ma and 286 ± 11 Ma. Their respective epidote rims yield eoalpine ages of 98 ± 2 Ma and 96 ± 2 Ma. One micaschist sample from the Rappold-Complex yields ages of 326 ± 9 Ma for the allanite cores and 101 ± 1 Ma for the epidote rims. These ages are interpreted as prograde crystallization of allanite and epidote and give us petrochronological information about three distinct metamorphic events: Variscan, Permian and Eoalpine. By gathering three distinct eoalpine ages within the EPZ and the KW-NS, we can further constrain the metamorphic evolution of the eoalpine lower plate." @default.
- W4322005008 created "2023-02-26" @default.
- W4322005008 creator A5006140134 @default.
- W4322005008 creator A5044025967 @default.
- W4322005008 creator A5059384524 @default.
- W4322005008 creator A5075672569 @default.
- W4322005008 date "2023-05-15" @default.
- W4322005008 modified "2023-09-30" @default.
- W4322005008 title "From sedimentation to multiple tectono-thermal events: U/Pb zircon and allanite dating in the Eastern Alps" @default.
- W4322005008 doi "https://doi.org/10.5194/egusphere-egu23-8495" @default.
- W4322005008 hasPublicationYear "2023" @default.
- W4322005008 type Work @default.
- W4322005008 citedByCount "0" @default.
- W4322005008 crossrefType "posted-content" @default.
- W4322005008 hasAuthorship W4322005008A5006140134 @default.
- W4322005008 hasAuthorship W4322005008A5044025967 @default.
- W4322005008 hasAuthorship W4322005008A5059384524 @default.
- W4322005008 hasAuthorship W4322005008A5075672569 @default.
- W4322005008 hasConcept C101139013 @default.
- W4322005008 hasConcept C127313418 @default.
- W4322005008 hasConcept C151730666 @default.
- W4322005008 hasConcept C153220577 @default.
- W4322005008 hasConcept C17409809 @default.
- W4322005008 hasConcept C26687426 @default.
- W4322005008 hasConcept C26815474 @default.
- W4322005008 hasConcept C2776212575 @default.
- W4322005008 hasConcept C2778571990 @default.
- W4322005008 hasConcept C2778849375 @default.
- W4322005008 hasConcept C77928131 @default.
- W4322005008 hasConceptScore W4322005008C101139013 @default.
- W4322005008 hasConceptScore W4322005008C127313418 @default.
- W4322005008 hasConceptScore W4322005008C151730666 @default.
- W4322005008 hasConceptScore W4322005008C153220577 @default.
- W4322005008 hasConceptScore W4322005008C17409809 @default.
- W4322005008 hasConceptScore W4322005008C26687426 @default.
- W4322005008 hasConceptScore W4322005008C26815474 @default.
- W4322005008 hasConceptScore W4322005008C2776212575 @default.
- W4322005008 hasConceptScore W4322005008C2778571990 @default.
- W4322005008 hasConceptScore W4322005008C2778849375 @default.
- W4322005008 hasConceptScore W4322005008C77928131 @default.
- W4322005008 hasLocation W43220050081 @default.
- W4322005008 hasOpenAccess W4322005008 @default.
- W4322005008 hasPrimaryLocation W43220050081 @default.
- W4322005008 hasRelatedWork W1930869834 @default.
- W4322005008 hasRelatedWork W1968773687 @default.
- W4322005008 hasRelatedWork W1970746836 @default.
- W4322005008 hasRelatedWork W2049826780 @default.
- W4322005008 hasRelatedWork W2090288501 @default.
- W4322005008 hasRelatedWork W2157291322 @default.
- W4322005008 hasRelatedWork W2353948160 @default.
- W4322005008 hasRelatedWork W2368908036 @default.
- W4322005008 hasRelatedWork W2997948645 @default.
- W4322005008 hasRelatedWork W4322005008 @default.
- W4322005008 isParatext "false" @default.
- W4322005008 isRetracted "false" @default.
- W4322005008 workType "article" @default.