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Descripción

Slices of polycyclic metasediments (marbles and meta-cherts) are tectonically amalgamated with the polydeformed basement of the Dent Blanche tectonic system along a major Alpine shear zone in the Western Alps (Becca di Salé area, Valtournenche Valley). A combination of techniques (structural analysis at various scales, metamorphic petrology, geochronology and trace element geochemistry) was applied to determine the age and composition of accessory phases (titanite, allanite and zircon) and their relation to major minerals. The results are used to reconstruct the polyphase structural and metamorphic history, comprising both pre-Alpine and Alpine cycles. The pre-Alpine evolution is associated with low-pressure high-temperature metamorphism related to Permo-Triassic lithospheric thinning. In meta-cherts, microtextural relations indicate coeval growth of allanite and garnet during this stage, at ~ 300 Ma. Textures of zircon also indicate crystallization at HT conditions; ages scatter from 263-294 Ma, with a major cluster of data at ~ 276 Ma. In impure marble, U-Pb analyses of titanite domains (with variable Al and F contents) yield apparent 206Pb/238U dates range from Permian to Jurassic. Chemical and isotopic data suggest that titanite formed at Permian times and was then affected by (extension-related?) fluid circulation during the Triassic and Jurassic, which redistributed major elements (Al and F) and partially opened the U-Pb system. The Alpine cycle lead to early blueschist facies assemblages, which were partly overprinted under greenschist facies conditions. The strong Alpine compressional overprint disrupted the pre-Alpine structural imprint and/or reactivated earlier structures. The pre-Alpine metamorphic record, preserved in these slices of metasediments, reflects the onset of the Permo-Triassic lithospheric extension to Jurassic rifting.

Pertenece a

PANGAEA - Publishing Network for Geoscientific & Environmental Data  

Autor(es)

Manzotti, Paola -  Rubatto, Daniela -  Darling, James -  Zucali, Michele -  Cenki -  Tok, Bénédicte -  Engi, Martin - 

Id.: 55304531

Idioma: inglés  - 

Versión: 1.0

Estado: Final

Tipo:  application/zip, 19 datasets - 

Palabras clave = 2 Eu[N] / (Sm[N] + Gd[N]) -  1 sigma -  1 sigma error -  204Pb/206Pb -  204Pb/206Pb e rel -  206Pb -  206Pb/204Pb -  206Pb/238U -  206Pb/238U, common -  Pb corrected -  Pb corrected, 2 sigma error -  206Pb/238U e rel -  207Pb -  207Pb/206Pb -  207Pb/206Pb e rel -  207Pb/206Pb std e -  207Pb/235U -  208Pb -  208Pb/204Pb -  208Pb/206Pb -  208Pb/232Th -  208Pb/232Th, common -  208Pb/232Th e rel -  232Th/238U -  238U/206Pb -  238U/206Pb std e -  add el -  add ox -  Adr -  Age -  AGE -  Age, dated -  Age, dated standard deviation -  Age, error -  Age, Lead -  Thorium -  Uranium -  Age, Uranium -  Lead -  Age dated -  Age e -  Age std dev -  Al -  Al2O3 -  Alm -  Almandine -  Aluminium -  Aluminium oxide -  Andradite -  Australia -  B -  Ba -  Barium -  Be -  Beryllium -  Boron -  Ca -  Caesium -  Calcium -  Calcium oxide -  Calculated based on oxygen number -  CaO -  Cat -  Cations -  Ce -  Ce2O3 -  Cerium -  Cerium oxid -  chondrite -  normalised -  normalized -  Clast shape -  Coeff -  Coefficient -  common -  corrected -  Cs -  data for Tera -  Wasserburg plot2 -  Wasserburg plot2, 1 sigma -  Wasserburg plot2. 1 sigma -  Dy -  Dy/Gd -  Dy/Yb -  Dy2O3 -  Dysprosium -  Dysprosium/Gadolinium ratio -  Dysprosium/Ytterbium ratio -  Dysprosium oxide -  Electron microprobe -  Elements, total -  Er -  Erbium -  err 2 sigma -  Eu -  Eu/Eu* -  Europium -  Europium anomaly -  Event -  F -  Fe2+ -  Fe2O3 -  Fe3+ -  FeO -  Fluorine -  Gadolinium -  Gadolinium oxide -  garnet/allanite -  Gd -  Gd2O3 -  Grossularite -  Grsl -  H -  H2O -  Hafnium -  HAND -  Hf -  Ho -  Holmium -  Hydrogen -  Hydroxide -  Iron 2+ -  Iron 3+ -  Iron oxide, Fe2O3 -  Iron oxide, FeO -  K -  K2O -  La -  La2O3 -  Label -  LA -  ICP -  MS, Laser -  ablation inductively coupled plasma mass spectrometer -  Lanthanum -  Lanthanum oxide -  Lead -  Lead 204/Lead 206, error relative -  Lead 204/Lead 206 ratio -  Lead 206 -  Lead 206/Lead 204 ratio -  Lead 206/Uranium 238 -  Lead 206/Uranium 238, error relative -  Lead 207 -  Lead 207/Lead 206, error relative -  Lead 207/Lead 206, standard error -  Lead 207/Lead 206 ratio -  Lead 207/Uranium 235 -  Lead 207/Uranium 235, error relative -  Lead 208 -  Lead 208/Lead 204 ratio -  Lead 208/Lead 206 ratio -  Lead 208/Thorium 232, error relative -  Lead 208/Thorium 232 ratio -  Lead oxide -  Li -  Lithium -  Lu -  Lu/Sm -  Lutetium -  Lutetium/Samarium ratio -  Magnesium -  Magnesium oxide -  Manganese -  Manganese 2+ -  Manganese oxide -  Mann_Terrane -  Mg -  MgO -  Mineral -  Mineral name -  Mn -  Mn2+ -  MnO -  Na -  Na2O -  Nb -  Nd -  Nd2O3 -  Neodymium -  Neodymium oxid -  Niobium -  No O -  Number of oxygens -  ODP sample designation -  OH -  ORDINAL NUMBER -  Ord No -  P -  P2O5 -  Pb -  PbO -  Phosphorus -  Phosphorus oxide -  Potassium -  Potassium oxide -  Pr -  Pr2O3 -  Praseodymium -  Praseodymium(III) oxide -  Prp -  Pyrope -  Rb -  REE + Y -  Rubidium -  Samarium -  Samarium oxide -  Sample code/label -  Sampling by hand -  Sensitive high -  resolution ion microprobe (SHRIMP) -  Shape -  Si -  Silicon -  Silicon dioxide -  SiO2 -  Sm -  Sm2O3 -  Sodium -  Sodium oxide -  Spessartine -  Sps -  Sr -  SrO -  Strontium -  Strontium oxide -  Sum -  Ta -  Tantalum -  Tb -  Tb2O3 -  Terbium -  Terbium(III) oxide -  Th -  Th/U -  ThO2 -  Thorium -  Thorium/Uranium ratio -  Thorium 232/Uranium 238 ratio -  Thorium oxide -  Thulium -  Ti -  TiO2 -  Titanium -  Titanium oxide -  Tm -  total -  U -  Uniform resource locator/link to file -  UO2 -  Uranium -  Uranium 238/Lead 206, standard error -  Uranium 238/Lead 206 ratio -  Uranium dioxide -  URL file -  VT08102 -  VT08121 -  VT08122 -  VT08129 -  VT0912 -  Water in rock -  Western European Alps, Italy -  Y -  Y2O3 -  Yb -  Ytterbium -  Yttrium -  Yttrium oxide -  Zirconium -  zone -  Zr - 

Cobertura:  MEDIAN LATITUDE: 38.322722 * MEDIAN LONGITUDE: 20.401024 * SOUTH-BOUND LATITUDE: -25.972500 * WEST-BOUND LONGITUDE: 7.572717 * NORTH-BOUND LATITUDE: 45.887439 * EAST-BOUND LONGITUDE: 129.430800 - 

Tipo de recurso: Dataset  - 

Tipo de Interactividad: Expositivo

Nivel de Interactividad: muy bajo

Audiencia: Estudiante  -  Profesor  -  Autor  - 

Estructura: Atomic

Coste: no

Copyright: sí

: CC-BY: Creative Commons Attribution 3.0 Unported

Formatos:  application/zip, 19 datasets - 

Requerimientos técnicos:  Browser: Any - 

Relación: [IsBasedOn] Supplement to: Manzotti, Paola; Rubatto, Daniela; Darling, James; Zucali, Michele; Cenki-Tok, Bénédicte; Engi, Martin (2012): From Permo-Triassic lithospheric thinning to Jurassic rifting at the Adriatic margin: petrological and geochronological record in Valtournenche (Western Italian Alps). Lithos, 146-147, 276-292, doi:10.1016/j.lithos.2012.05.007

Fecha de contribución: 27-jun-2016

Contacto:

Localización:
* doi:10.1594/PANGAEA.782429

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