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Schaaff, Valentine; Grossi, Vincent; Makou, Matthew; Garcin, Yannick; Deschamps, Pierre; Hamelin, Bruno; Kiahtipes, Christopher Albert; Sebag, David; Ngounou Ngatcha, Benjamin; Ménot, Guillemette (2025): General lipid biomarker from the NGaoundaba peat deposit (Tropical Africa) covering the Holocene [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.979862

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Published: 2025-03-31 • DOI registered: 2025-03-31

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Abstract:
This dataset includes lipid biomarker data from a peat sequence (named NGBA19) collected at the NGaoundaba peat deposit in 2019. The NGaoundaba peat deposit is located in North East Cameroon (N 7.135°, E 13.690°, 1175 m a.s.l). The 6-meter core was collected using a Russian peat corer. The core was subsampled at 2.5-cm intervals. Analyses were performed on 73 samples. Measurements were performed between 2020 and 2024 at the LGL-TPE (ENS de Lyon and University Claude Bernard Lyon 1). The NGBA19 core covers the last 10 ka (detail on the datation method and results are given in Schaaff et al. (2023, doi:10.1016/j.orggeochem.2023.104589). This dataset is associated to a publication: Sensitivity to climate and vegetation dynamics of a peatland record from Central Cameroon during the African Humid Period (QSR). The publication details the full method used to obtain the data. The study focus on paleoclimatic and paleoenvironmental reconstructions particularly during and after the African Humid Period. This file contains long-chain n-alkane data (n-C29, n-C31, n-C33 alkanes): relative abundance and concentration for each compounds and ratios (carbon preference index - CPI, average chain length - ACL and Paq). These data were collected using GC-MS (compound identification and quantification). The file also includes a ratio based on brGDGTs: the methylation of branched tetraethers (MBT'5Me) ratio and brGDGT-based temperature reconstructions using 4 different calibrations presented in the associated article.
Keyword(s):
African Humid Period; alkanes; Biomarker; GDGT; pollen analysis; Tropical peatlands
Supplement to:
Schaaff, Valentine; Grossi, Vincent; Makou, Matthew; Garcin, Yannick; Deschamps, Pierre; Hamelin, Bruno; Kiahtipes, Christopher Albert; Sebag, David; Ngounou Ngatcha, Benjamin; Ménot, Guillemette (in review): Sensitivity to climate and vegetation dynamics of a peatland record from Central Cameroon during the African Humid Period. Quaternary Science Reviews
Funding:
Agence Nationale de la Recherche (ANR), grant/award no. ANR-18-CE01-0005: ANR TAPIOCA
Coverage:
Latitude: 7.135000 * Longitude: 13.690000
Date/Time Start: 2019-02-01T00:00:00 * Date/Time End: 2019-02-01T00:00:00
Minimum DEPTH, sediment/rock: 0.100 m * Maximum DEPTH, sediment/rock: 5.900 m
Event(s):
NGBA19 * Latitude: 7.135000 * Longitude: 13.690000 * Date/Time: 2019-02-01T00:00:00 * Elevation: 1175.0 m * Location: NGaoundaba peatland, Northeastern Cameroon * Method/Device: Core (CORE)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepth sedmSchaaff, ValentineGeocode
2AGEAgeka BPSchaaff, ValentineAge, 14C calibratedGeocode
3n-Alkane C29, per unit mass total organic carbonC29/TOCµg/gSchaaff, ValentineGas chromatography - Mass spectrometry (GC-MS), Agilent, 6890N coupled to 5975C Mass Selective Detector (MSD) or Gas chromatography - Mass spectrometry (GC-MS), Agilent, 7890B coupled to 5977B Mass Selective Detector (MSD)m/z 71
4n-Alkane C31, per unit mass total organic carbonC31/TOCµg/gSchaaff, ValentineGas chromatography - Mass spectrometry (GC-MS), Agilent, 6890N coupled to 5975C Mass Selective Detector (MSD) or Gas chromatography - Mass spectrometry (GC-MS), Agilent, 7890B coupled to 5977B Mass Selective Detector (MSD)m/z 71
5n-Alkane C33, per unit mass total organic carbonC33/TOCµg/gSchaaff, ValentineGas chromatography - Mass spectrometry (GC-MS), Agilent, 6890N coupled to 5975C Mass Selective Detector (MSD) or Gas chromatography - Mass spectrometry (GC-MS), Agilent, 7890B coupled to 5977B Mass Selective Detector (MSD)m/z 71
6n-Alkane C29, of C19-C37 n-alkanesC29/(C19-C37)%Schaaff, ValentineGas chromatography - Mass spectrometry (GC-MS), Agilent, 6890N coupled to 5975C Mass Selective Detector (MSD) or Gas chromatography - Mass spectrometry (GC-MS), Agilent, 7890B coupled to 5977B Mass Selective Detector (MSD)m/z 71
7n-Alkane C31, of C19-C37 n-alkanesC31/(C19-C37)%Schaaff, ValentineGas chromatography - Mass spectrometry (GC-MS), Agilent, 6890N coupled to 5975C Mass Selective Detector (MSD) or Gas chromatography - Mass spectrometry (GC-MS), Agilent, 7890B coupled to 5977B Mass Selective Detector (MSD)m/z 71
8n-Alkane C33, of C19-C37 n-alkanesC33/(C19-C37)%Schaaff, ValentineGas chromatography - Mass spectrometry (GC-MS), Agilent, 6890N coupled to 5975C Mass Selective Detector (MSD) or Gas chromatography - Mass spectrometry (GC-MS), Agilent, 7890B coupled to 5977B Mass Selective Detector (MSD)m/z 71
9Carbon Preference IndexCPISchaaff, ValentineCalculation according to Marzi et al. (1993)m/z 71
10Average chain lengthACLSchaaff, ValentineCalculation according to Poynter et al. (1989)m/z 71
11Aquatic n-alkane proxyPaqSchaaff, ValentineCalculation according to Ficken et al. (2000)m/z 71
12Methylation index of 5-methyl branched glycerol dialkyl glycerol tetraetherMBT5MESchaaff, ValentineCalculated according to De Jonge et al. (2014b)
13Temperature, air, annual meanMAAT°CSchaaff, ValentineCalculated according to Naafs et al. (2017)
14Temperature, air, annual meanMAAT°CSchaaff, ValentineAccording to Dearing Crampton-Flood et al (2020)
15Temperature, air, annual meanMAAT°CSchaaff, ValentineAccording to Martínez-Sosa et al. (2021)
16Temperature, air, annual meanMAAT°CSchaaff, ValentineAccording to Véquaud et al. (2022)
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
972 data points

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