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).

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Metadata Access
Creator Brisset, Elodie
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2020
Rights Creative Commons Attribution 4.0 International;
OpenAccess true
Language English
Resource Type Collection of Datasets; Collection
Format application/zip
Size 6 datasets
Discipline Earth System Research
Spatial Coverage (7.189 LON, 44.113 LAT); Alps