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Daily growth and tidal rhythms in Miocene and modern giant clams revealed via ultra-high resolution LA-ICPMS analysis — A novel methodological approach towards improved sclerochemistry

Warter, Viola ; Müller, Wolfgang

Palaeogeography, Palaeoclimatology, Palaeoecology, 01 January 2017, Vol.465, pp.362-375 [Rivista Peer Reviewed]

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  • Titolo:
    Daily growth and tidal rhythms in Miocene and modern giant clams revealed via ultra-high resolution LA-ICPMS analysis — A novel methodological approach towards improved sclerochemistry
  • Autore: Warter, Viola ; Müller, Wolfgang
  • Descrizione: We present a novel approach for ultra-high resolution laser-ablation inductively-coupled-plasma mass spectrometry (LA-ICPMS) analysis, which not only allows us to clearly resolve <10μm (daily) compositional variability in B/Ca, Mg/Ca, Sr/Ca and Ba/Ca, but also to detect long-term tidal and seasonal cycles in both Miocene and modern Tridacna (giant clam) shells. Daily element/Ca variability preserved within microscopically visible growth increments is resolved by utilizing the combined capabilities of a rotating rectangular aperture (spot size on target 4×50μm), the rapid signal washout of a Laurin two-volume laser ablation cell and slow compositional profiling (≤1.5μm/s). Striking co-variation between oscillating cycles in B/Ca, Mg/Ca, Sr/Ca and Ba/Ca is discernible, yet also tantalizingly, sub-daily shifts between these element/Ca ratios can be observed. In comparison to a lower-resolution, seasonally-resolved δ18O–Mg/Ca record (Warter et al., 2015), the ~10–20μm element/Ca...
  • Fa parte di: Palaeogeography, Palaeoclimatology, Palaeoecology, 01 January 2017, Vol.465, pp.362-375
  • Soggetti: Tridacna Spp ; Miocene ; Daily Cycles ; Tidal Periodicity ; Ultra-High Resolution La-Icpms ; Image Processing ; Tridacna Spp ; Miocene ; Daily Cycles ; Tidal Periodicity ; Ultra-High Resolution La-Icpms ; Image Processing ; Geology
  • Lingua: Inglese
  • Identificativo: ISSN: 0031-0182 ; E-ISSN: 1872-616X ; DOI: 10.1016/j.palaeo.2016.03.019
  • Fonte: ScienceDirect Journals (Elsevier)

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