Santos, Felipe Rodrigues; Lourenço, Rafael André; Taniguchi, Satie; Martins, César de Castro; Wainer, Ilana E K C; Mahiques, Michel Michaelovitch; Nagai, Renata Hanae; Figueira, Rubens César Lopes; Bouloubassi, Ioanna D; Bicego, Marcia C (2026): n-Alkane concentrations and molecular indices (CPI, ACL, Paq) from Holocene marine sediment cores MDBT 557 and MDBT 561 (southern Brazilian shelf) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.992687
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Published: 2026-03-09 • DOI registered: 2026-03-09
Abstract:
This dataset presents concentrations of long-chain n-alkanes (nC25–nC33) and derived molecular indices, including Carbon Preference Index (CPI), Average Chain Length (ACL), and Paq, from Holocene marine sediment cores MDBT 557 and MDBT 561, recovered from the southern Brazilian continental shelf. Lipid biomarkers were extracted using organic solvents, purified by column chromatography, and quantified by gas chromatography with flame ionization detection (GC-FID), with surrogate standards used to assess analytical recovery. These data characterize variations in terrigenous organic matter input, vegetation-related signals, and hydrological conditions affecting the continental margin during the Holocene.
Supplement to:
Santos, Felipe Rodrigues; Lourenço, Rafael André; Taniguchi, Satie; Martins, César de Castro; Wainer, Ilana E K C; Mahiques, Michel Michaelovitch; Nagai, Renata Hanae; Figueira, Rubens César Lopes; Bouloubassi, Ioanna D; Bicego, Marcia C (in review): Holocene composition, origin, and evolution of terrigenous organic matter in the southwestern Atlantic Ocean: Insights about vegetation, climate and oceanographic variations. Paleoceanography and Paleoclimatology
References:
Blaauw, Maarten; Christen, Andrés (2011): Flexible paleoclimate age-depth models using an autoregressive gamma process. Bayesian Analysis, 6(3), 457-474, https://doi.org/10.1214/11-BA618
Bray, E E; Evans, E D (1961): Distribution of n-paraffins as a clue to recognition of source beds. Geochimica et Cosmochimica Acta, 22(1), 2-15, https://doi.org/10.1016/0016-7037(61)90069-2
Heaton, Timothy J; Köhler, Peter; Butzin, Martin; Bard, Edouard; Reimer, Ron W; Austin, William EN; Ramsey, Christopher Bronk; Grootes, Pieter Meiert; Hughen, Konrad A; Kromer, Bernd; Reimer, Paula J; Adkins, Jess F; Burke, Andreas; Cook, Mea S; Olsen, Jesper; Skinner, Luke C (2020): Marine20 - the marine radiocarbon age calibration curve (0-55,000 cal BP). Radiocarbon, 62(4), 779-820, https://doi.org/10.1017/RDC.2020.68
Poynter, J G; Farrimond, Paul; Robinson, Nicole; Eglinton, Geoffrey (1989): Aeolian-Derived Higher Plant Lipids in the Marine Sedimentary Record: Links with Palaeoclimate. In: Leinen, M, Sarnthein, M (eds.), Paleoclimatology and Paleometeorology: Modern and Past Patterns of Global Atmospheric Transport, Springer Netherlands, Dordrecht, 435-462, https://doi.org/10.1007/978-94-009-0995-3_18
Funding:
São Paulo Research Foundation (FAPESP), grant/award no. 17/20344-7: Mudbelts of Southern and Southeast Brazil: Implications on anthropogenic influences on the marine environment
Coverage:
Median Latitude: -33.530000 * Median Longitude: -51.755000 * South-bound Latitude: -33.790000 * West-bound Longitude: -52.210000 * North-bound Latitude: -33.270000 * East-bound Longitude: -51.300000
Date/Time Start: 2019-06-02T12:20:00 * Date/Time End: 2019-06-02T13:22:00
Minimum Elevation: -90.0 m * Maximum Elevation: -80.0 m
Event(s):
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Santos, Felipe Rodrigues | |||
| 2 | Latitude of event | Latitude | Santos, Felipe Rodrigues | |||
| 3 | Longitude of event | Longitude | Santos, Felipe Rodrigues | |||
| 4 | Date/Time of event | Date/Time | Santos, Felipe Rodrigues | |||
| 5 | Elevation of event | Elevation | m | Santos, Felipe Rodrigues | ||
| 6 | AGE | Age | ka BP | Santos, Felipe Rodrigues | Age, 14C calibrated | Geocode – Age model according to Blaauw and Christen (2011), using BACON v2.4.3, with calibration using Marine20 (Heaton et al., 2020) |
| 7 | n-Alkanes, sum, per unit sediment mass | n-A sum/sed | µg/g | Santos, Felipe Rodrigues | summarized | |
| 8 | Sum n-alkanes C25-C33 | C25-C33 | µg/g | Santos, Felipe Rodrigues | Gas chromatography - Flame Ionization Detection (GC-FID), Agilent Technologies, HP7890B | |
| 9 | n-Alkanes, average chain length | ACL n-Alkane | Santos, Felipe Rodrigues | Calculated according to Poynter (1989) | ||
| 10 | Average chain length, n-Alkanes, C27-C33 | ACL 27-33 | Santos, Felipe Rodrigues | Calculated according to Poynter (1989) | ||
| 11 | Carbon Preference Index | CPI | Santos, Felipe Rodrigues | Calculated according to Bray and Evans (1961) | ||
| 12 | Aquatic n-alkane proxy | Paq | Santos, Felipe Rodrigues | Calculated |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1296 data points