PANGAEA_992687 n-Alkane concentrations and molecular indices (CPI, ACL, Paq) from Holocene marine sediment cores MDBT 557 and MDBT 561 (southern Brazilian shelf) 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 n-Alkane concentrations and molecular indices (CPI, ACL, Paq) from Holocene marine sediment cores MDBT 557 and MDBT 561 (southern Brazilian shelf) 2026-03-09 PANGAEA Dataset https://doi.pangaea.de/10.1594/PANGAEA.992687 Investigator Felipe Rodrigues Santos feliperod@usp.br Earth Science Event label Latitude of event Longitude of event Date/Time of event Elevation of event AGE n-Alkanes, sum, per unit sediment mass Sum n-alkanes C25-C33 n-Alkanes, average chain length Average chain length, n-Alkanes, C27-C33 Carbon Preference Index Aquatic n-alkane proxy geoscientificInformation alkanes Gravity corer La Plata River MDBT_557 MDBT_561 southern Brazilian margin vegetation changes Age, 14C calibrated summarized Gas chromatography - Flame Ionization Detection (GC-FID), Agilent Technologies, HP7890B Calculated according to Poynter (1989) Calculated according to Bray and Evans (1961) Calculated 2019-06-02 2019-06-02 Complete -33.79 -33.27 -52.21 -51.3 unrestricted CC-BY-4.0: Creative Commons Attribution 4.0 International English PANGAEA Data Publisher for Earth & Environmental Science https://www.pangaea.de/ Data Center Contact Michael Diepenbroek info@pangaea.de

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Bremen Bremen 28359 Germany online 1296 data points text/tab-separated-values 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 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

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. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.992687"!

http://en.wikipedia.org/wiki/Kyr AGE https://doi.org/10.1007/978-94-009-0995-3_18 Aeolian-Derived Higher Plant Lipids in the Marine Sedimentary Record: Links with Palaeoclimate https://doi.org/10.1007/978-94-009-0995-3_18 Calculated according to Poynter (1989) https://doi.org/10.1016/0016-7037(61)90069-2 Calculated according to Bray and Evans (1961) https://doi.org/10.1016/0016-7037(61)90069-2 Distribution of n-paraffins as a clue to recognition of source beds https://doi.org/10.1017/RDC.2020.68 Marine20 - the marine radiocarbon age calibration curve (0-55,000 cal BP) https://doi.org/10.1214/11-BA618 Flexible paleoclimate age-depth models using an autoregressive gamma process DIF 9.4 2026-03-09 2026-04-30