Obreht, Igor; Lückge, Andreas; Mohtadi, Mahyar; Zahajská, Petra; Schefuß, Enno; Scholz, Denis; Wörmer, Lars; Hällberg, Petter; Budsky, Alexander; Adolphi, Florian; Haug, Gerald H; Grosjean, Martin; Hinrichs, Kai-Uwe (2026): Carbon (δ13C) and hydrogen (δD) isotope composition of leaf wax n-alkanes from sediment core SO130_289KL, northeastern Arabian Sea, reflecting hydroclimate and vegetation changes during the last deglaciation [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.993862
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Published: 2026-05-06 • DOI registered: 2026-05-06
Abstract:
This dataset contains stable carbon (δ13C) and hydrogen (δD) isotope measurements of long-chain n-alkanes (primarily n-C31) extracted from sediment core SO130_289KL (23°07.34′N, 66°29.84′E; 571 m water depth) from the northeastern Arabian Sea. The samples span the last deglaciation and were analyzed to reconstruct past hydroclimate and vegetation dynamics in the Indus River catchment. Lipid extracts were separated into fractions and analyzed using gas chromatography–isotope ratio mass spectrometry (GC-IRMS). δ13C values provide information on vegetation type (C3 vs. C4 plants), while δD values reflect precipitation isotopic composition after correcting for vegetation effects and global ice volume changes. Analytical precision is ±0.3‰ for δ13C and ±3‰ for δD. This dataset was generated to complement high-resolution marine proxy records generated by mass spectrometry and hyperspectral inaging and to link oceanographic variability with continental climate and monsoon-driven hydrological changes. Depth is presented as centimeters below seafloor (cmbsf) and age as before the year 2000 CE (b2k).
Keyword(s):
Funding:
German Research Foundation (DFG), grant/award no. 464898428: Micrometer-scale biomarker and elemental imaging on sediments from the northeastern Arabian Sea – reconstruction of the Indian monsoon evolution on a sub-decadal scale in the Holocene and the Bølling-Allerød interstadial
Coverage:
Latitude: 23.122333 * Longitude: 66.497333
Date/Time Start: 1998-04-21T00:00:00 * Date/Time End: 1998-04-21T00:00:00
Minimum DEPTH, sediment/rock: 2.61 m * Maximum DEPTH, sediment/rock: 3.56 m
Event(s):
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Obreht, Igor | Geocode – mbsf | |
| 2 | Age | Age | ka b2k | Obreht, Igor | ||
| 3 | n-Alkane C31, δD | C31 δD | ‰ SMOW | Obreht, Igor | Gas chromatography - isotope ratio mass spectrometry (GC-IRMS) | |
| 4 | n-Alkane C31, δD | C31 δD | ‰ SMOW | Obreht, Igor | Gas chromatography - isotope ratio mass spectrometry (GC-IRMS) | corrected δD precipitation |
| 5 | δ Deuterium, n-alkane C31, uncertainty | δD n-alkane C31 unc | Obreht, Igor | |||
| 6 | n-Alkane C31, δ13C | C31 δ13C | ‰ PDB | Obreht, Igor | Gas chromatography - isotope ratio mass spectrometry (GC-IRMS) | vs. VPDB |
| 7 | n-Alkane C31, δ13C, uncertainty | C31 δ13C unc | Obreht, Igor |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
72 data points
Data
| 1 Depth sed [m] (mbsf) | 2 Age [ka b2k] | 3 C31 δD [‰ SMOW] | 4 C31 δD [‰ SMOW] (corrected δD precipitation) | 5 δD n-alkane C31 unc | 6 C31 δ13C [‰ PDB] (vs. VPDB) | 7 C31 δ13C unc |
|---|---|---|---|---|---|---|
| 2.61 | 12.183 | -148.9 | -36.2 | 3 | -26.25 | 0.3 |
| 2.81 | 12.647 | -147.6 | -34.8 | 3 | -25.94 | 0.3 |
| 2.91 | 12.867 | -147.9 | -34.7 | 3 | -25.32 | 0.3 |
| 3.01 | 13.024 | -155.3 | -42.9 | 3 | -24.95 | 0.3 |
| 3.11 | 13.199 | -148.6 | -35.3 | 3 | -24.83 | 0.3 |
| 3.21 | 13.484 | -152.3 | -39.0 | 3 | -24.10 | 0.3 |
| 3.27 | 13.659 | -140.5 | -26.8 | 3 | -25.04 | 0.3 |
| 3.35 | 13.933 | -138.7 | -24.7 | 3 | -24.67 | 0.3 |
| 3.41 | 14.163 | -150.6 | -37.2 | 3 | -23.59 | 0.3 |
| 3.48 | 14.596 | -147.5 | -35.1 | 3 | -24.55 | 0.3 |
| 3.52 | 14.686 | -135.6 | -22.5 | 3 | -25.30 | 0.3 |
| 3.56 | 16.005 | -143.7 | -32.4 | 3 | -24.93 | 0.3 |