Sedimentological and geochemical compositions of the Lake Petit sediments (Southern French Alps)

doi:doi:10.1594/PANGAEA.921655

Sedimentological and geochemical compositions of the Lake Petit sediments (Southern French Alps)

A 144-cm long sediment core named PET09P2 (coordinates N 44°06.789; E 7°11.342) has been taken in 2009 in the Lake Petit (2200 m a.s.l., in the Southern Alps, city of Valdeblore, France), covering the Mid- to Late-Holocene period (last 4800 years BP). This dataset includes the sedimentological and geochemical analyses, that were used as proxies to reconstruct catchment and lake paleoenvironmental changes:

Age-depth model based on radiocarbon ages (7 samples) and short-lived isotopes (210Pb, 137Cs).
Clay-size particles abundance (Grain-size laser diffraction measured on a Malvern Mastersizer S at 5 mm sampling intervals).
Total organic carbon concentrations in per cent (24 discrete samples by Rock-Eval Pyrolysis on a Turbo Model RE6 pyrolyser), as well as Hydrogen and Oxygen Indexes (mg/g of total organic carbon).
Major element concentrations in per cent (SiO2, Al2O3, Fe2O3, MnO, MgO, CaO, Na2O, K2O, TiO2, P2O5 measured by mass spectrometry on an ICP-AES Thermo X7 after LiBO2 alkaline fusion) and, biogenic silica (SiO2biog) concentration in per cent measured after wet-alkaline leaching using molybdate-yellow spectrophotometry on a Jasco V-650 Spectrophotometer.
Fourier Transformed Infrared Spectroscopy (FTIRS) inference for SiO2 biogenic and TOC concentrations in per cent (continuous sampling at 1 cm intervals), measured on a Nicolet 380 Smart Diffuse Reflectance spectrometer.
XRF core scanning inference for Detrital Fraction (DF% = 6.2*Ln[Ti/Si]+20.8), and Chemical Index of Alteration (Ln[Ti/Ca]); measure on an ITRAX Core Scanner (Mo source, 2 mm increment, integration time 60 s, energy 40 kV-35 mA). As shown in Brisset et al., (2013), the relationship between the Ln(Ti/Ca) XRF intensities and the CIA (%) is linear and positive, and both are highly related (n = 20, r = 0.90).

BibTex:

@dataset{Brisset_Elodie_2020,
    abstract = {A 144-cm long sediment core named PET09P2 (coordinates N 44°06.789; E 7°11.342) has been taken in 2009 in the Lake Petit (2200 m a.s.l., in the Southern Alps, city of Valdeblore, France), covering the Mid- to Late-Holocene period (last 4800 years BP). This dataset includes the sedimentological and geochemical analyses, that were used as proxies to reconstruct catchment and lake paleoenvironmental changes:

- Age-depth model based on radiocarbon ages (7 samples) and short-lived isotopes (210Pb, 137Cs).
- Clay-size particles abundance (Grain-size laser diffraction measured on a Malvern Mastersizer S at 5 mm sampling intervals).
- Total organic carbon concentrations in per cent (24 discrete samples by Rock-Eval Pyrolysis on a Turbo Model RE6 pyrolyser), as well as Hydrogen and Oxygen Indexes (mg/g of total organic carbon).
- Major element concentrations in per cent (SiO2, Al2O3, Fe2O3, MnO, MgO, CaO, Na2O, K2O, TiO2, P2O5 measured by mass spectrometry on an ICP-AES Thermo X7 after LiBO2 alkaline fusion) and, biogenic silica (SiO2biog) concentration in per cent measured after wet-alkaline leaching using molybdate-yellow spectrophotometry on a Jasco V-650 Spectrophotometer.
- Fourier Transformed Infrared Spectroscopy (FTIRS) inference for SiO2 biogenic and TOC concentrations in per cent (continuous sampling at 1 cm intervals), measured on a Nicolet 380 Smart Diffuse Reflectance spectrometer.
- XRF core scanning inference for Detrital Fraction (DF% = 6.2*Ln[Ti/Si]+20.8), and Chemical Index of Alteration (Ln[Ti/Ca]); measure on an ITRAX Core Scanner (Mo source, 2 mm increment, integration time 60 s, energy 40 kV-35 mA). As shown in Brisset et al., (2013), the relationship between the Ln(Ti/Ca) XRF intensities and the CIA (%) is linear and positive, and both are highly related (n = 20, r = 0.90).},
    author = {Brisset, Elodie},
    doi = {10.1594/PANGAEA.921655},
    institution = {PANGAEA (Lithosphere)},
    keyword = {'4.2 kyrs BP event', 'Alps', 'Holocene', 'Lake sediment', 'Mediterranean', 'Soil erosion', 'human impact'},
    title = {Sedimentological and geochemical compositions of the Lake Petit sediments (Southern French Alps)},
    url = {https://service.tib.eu/ldmservice/vdataset/png-doi-10-1594-pangaea-921655},
    year = {2020}
}