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Manzotti, Paola; Rubatto, Daniela; Darling, James; Zucali, Michele; Cenki-Tok, Bénédicte; Engi, Martin (2012): Geochemistry of samples from Valtournenche, Western Italian Alps [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.782429, Supplement to: Manzotti, P et al. (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, https://doi.org/10.1016/j.lithos.2012.05.007

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Abstract:
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.
Coverage:
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
Event(s):
Mann_Terrane * Latitude: -25.972500 * Longitude: 129.430800 * Location: Australia * Method/Device: Sampling by hand (HAND)
VT0912 * Latitude: 45.885741 * Longitude: 7.574247 * Location: Western European Alps, Italy * Method/Device: Sampling by hand (HAND)
VT08102 * Latitude: 45.887439 * Longitude: 7.574655 * Location: Western European Alps, Italy * Method/Device: Sampling by hand (HAND)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
19 datasets

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Datasets listed in this publication series

  1. Manzotti, P; Rubatto, D; Darling, J et al. (2012): (Table S10) Trace element distribution coefficients between garnet and allanite samples from Mann Terrane, central Australia. https://doi.org/10.1594/PANGAEA.782444
  2. Manzotti, P; Rubatto, D; Darling, J et al. (2012): (Figure 1) Trace element partitioning between garnet and allanite of Mann Terrane samples. https://doi.org/10.1594/PANGAEA.782527
  3. Manzotti, P; Rubatto, D; Darling, J et al. (2012): (Table S3) Representative analyses of titanite of Valtournenche samples. https://doi.org/10.1594/PANGAEA.782367
  4. Manzotti, P; Rubatto, D; Darling, J et al. (2012): (Table S16) U-Th-Pb analyses of titanites of sample VT0912. https://doi.org/10.1594/PANGAEA.782410
  5. Manzotti, P; Rubatto, D; Darling, J et al. (2012): (Table S6) Representative trace element composition of allanite of sample VT08102. https://doi.org/10.1594/PANGAEA.782371
  6. Manzotti, P; Rubatto, D; Darling, J et al. (2012): (Table S5) Representative analyses of the epidote group minerals of sample VT08102. https://doi.org/10.1594/PANGAEA.782369
  7. Manzotti, P; Rubatto, D; Darling, J et al. (2012): (Table S7) Representative analyses of garnet from meta-chert samples VT08129 and VT08102. https://doi.org/10.1594/PANGAEA.782372
  8. Manzotti, P; Rubatto, D; Darling, J et al. (2012): (Table S9) Trace element distribution coefficients between garnet and allanite of sample VT08102. https://doi.org/10.1594/PANGAEA.782396
  9. Manzotti, P; Rubatto, D; Darling, J et al. (2012): (Table S8) Representative trace element composition of garnet 1, sample VT08102. https://doi.org/10.1594/PANGAEA.782389
  10. Manzotti, P; Rubatto, D; Darling, J et al. (2012): (Table S17) U-Th-Pb analyses of allanites of sample VT08102. https://doi.org/10.1594/PANGAEA.782422
  11. Manzotti, P; Rubatto, D; Darling, J et al. (2012): (Table S4) Representative trace element composition of different titanite zones, samples VT08121 and VT08122. https://doi.org/10.1594/PANGAEA.782368
  12. Manzotti, P; Rubatto, D; Darling, J et al. (2012): (Table S14) U-Th-Pb analyses of titanites of sample VT08121. https://doi.org/10.1594/PANGAEA.782405
  13. Manzotti, P; Rubatto, D; Darling, J et al. (2012): (Table S1) Representative analyses of phengite of sample VT08122. https://doi.org/10.1594/PANGAEA.782363
  14. Manzotti, P; Rubatto, D; Darling, J et al. (2012): (Table S15) U-Th-Pb analyses of titanites of sample VT08122. https://doi.org/10.1594/PANGAEA.782407
  15. Manzotti, P; Rubatto, D; Darling, J et al. (2012): (Table S11) Representative trace element composition of different garnet zones of sample VT08129. https://doi.org/10.1594/PANGAEA.782397
  16. Manzotti, P; Rubatto, D; Darling, J et al. (2012): (Table S12) Representative trace element composition of different garnet zones of sample VT08129. https://doi.org/10.1594/PANGAEA.782399
  17. Manzotti, P; Rubatto, D; Darling, J et al. (2012): (Table S2) Representative analyses of Mn-cummingtonite, Mg-riebeckite, crossite and winchite of sample VT08129. https://doi.org/10.1594/PANGAEA.782364
  18. Manzotti, P; Rubatto, D; Darling, J et al. (2012): (Table S18) U-Th-Pb analyses of zircons of sample VT08129. https://doi.org/10.1594/PANGAEA.782427
  19. Manzotti, P; Rubatto, D; Darling, J et al. (2012): (Table S13) Representative trace element composition of zircon of sample VT08129. https://doi.org/10.1594/PANGAEA.782401