Biomarker proxies on ODP Holes 151-912A and 151-912B ...

• Main Authors: Stein, Ruediger, Fahl, Kirsten
• Format: Dataset
• Language: English
• Published: PANGAEA 2013
• Subjects: Event label; Sample code/label; DEPTH, sediment/rock; Carbon, organic, total; 2,6,10,14-Tetramethyl-7-3-methylpent-4-enylpentadecane, per unit mass total organic carbon; 2,10,14-Trimethyl-6-enyl-7-3-methylpent-1-enylpentadecene, per unit mass total organic carbon; 9Z-2,6,10,14-Tetramethyl-7-3-methylpent-4-enylidenpentadeca-9-ene, per unit mass total organic carbon; 9E-2,6,10,14-Tetramethyl-7-3-methylpent-4-enylidenpentadeca-9-ene, per unit mass total organic carbon; 24-Methylcholesta-5,22E-dien-3beta-ol, per unit mass total organic carbon; 24-ethylcholest-5-en-3beta-ol, per unit mass total organic carbon; Long-chain n-alkanes, C27+C29+C31, per unit mass total organic carbon; Phytoplankton biomarker Brassicasterol IP25 index; Drilling/drill rig; Element analyser CHN, LECO; Gas chromatography; Gas chromatography - Mass spectrometry GC-MS; Calculated; Leg151; Joides Resolution; Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo; Fram Strait; Phytoplankton; Sea ice; Yermak plateau
• Online Access: https://dx.doi.org/10.1594/pangaea.803128; https://doi.pangaea.de/10.1594/PANGAEA.803128

A novel and promising biomarker proxy for reconstruction of Arctic sea ice conditions was developed and is based on the determination of a highly branched isoprenoid with 25 carbons (IP25). IP25 records have been restricted to the last 150 kyr BP. We present a biomarker record from Ocean Drilling Program (ODP) Site 912, going back to the Pliocene–Pleistocene boundary and indicating that sea ice of variable extent occurred in the Fram Strait/southern Yermak Plateau area at least since about 2.2 Ma. Furthermore, our data support the idea that a combination of IP25 and open water, phytoplankton biomarker data (“PIP25 index”) may give a more reliable and quantitative estimate of past sea ice cover (at least for the study area). The study reveals that the novel IP25/PIP25 biomarker approach has potential for semi-quantitative paleo-sea ice studies covering the entire Quaternary and could motivate further detailed high resolution research on ODP/IODP material using this proxy. ... : Supplement to: Stein, Ruediger; Fahl, Kirsten (2013): Biomarker proxy shows potential for studying the entire Quaternary Arctic sea ice history. Organic Geochemistry, 55, 98-102 ...