• Chapter contents
• Abstract
• Introduction
• Methods and materials
• Analysis
• Results and discussion
• Continental input of GDGTs
• Impact of methane cycling
• Summary
• Acknowledgments
• References
• Figures
• F1. isoGDGT and brGDGT molecular structure.
• F2. Site bathymetry.
• F3. MI, BIT, and %GDGT-0 indexes, Site U1406.
• F4. MI, BIT, and %GDGT-0 indexes, Site U1411.
• Tables
• T1. Analysis results, Site U1406.
• T2. Analysis results, Site U1411.
• PDF file

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doi:10.2204/iodp.proc.342.205.2017

Data report: distribution and sources of tetraether lipids in Oligocene deposits from the western North Atlantic, IODP Sites U1406 and U1411¹

Kasia K. Śliwińska,^{2, 3} Anchelique Mets,³ and Stefan Schouten^{3, 4}

Abstract

We have analyzed the distribution of glycerol dialkyl glycerol tetraether lipids (GDGTs) in the Oligocene succession recovered by Integrated Ocean Drilling Program Expedition 342. The two studied sites, U1406 and U1411, penetrate a highly expanded section of the upper Eocene–Oligocene–lower Miocene succession.

The branched isoprenoid tetraether (BIT) index varies between 0.2 and 0.85, implying that there was a moderate to high influx of soil organic matter to both sites. Furthermore, during the late Oligocene (Chattian) the influx was lower than during the early Oligocene (Rupelian). The methane index (MI) and %GDGT-0 index values suggest that methanotrophic Euryarchaeota and methanogenic archaea are not the main source of GDGTs, but rather marine Thaumarchaeota.

¹ Śliwińska, K.K., Mets, A., and Schouten, S., 2017. Data report: distribution and sources of tetraether lipids in Oligocene deposits from the western North Atlantic, IODP Sites U1406 and U1411. In Norris, R.D., Wilson, P.A., Blum, P., and the Expedition 342 Scientists, Proceedings of the Integrated Ocean Drilling Program, 342: College Station, TX (Integrated Ocean Drilling Program).
doi:10.2204/iodp.proc.342.205.2017

² Geological Survey of Denmark and Greenland (GEUS), Department of Stratigraphy, Øster Voldagde 10, DK-1350 Copenhagen K, Denmark. kksl@geus.dk

³ Also at Royal Netherlands Institute for Sea Research (NIOZ), Department of Marine Microbiology and Biogeochemistry and Utrecht University, PO Box 59, NL-1790 AB Den Burg, Texel, The Netherlands.

⁴ Also at Department of Earth Sciences, Faculty of Geosciences, Utrecht University, The Netherlands.

Initial receipt: 16 September 2016
Acceptance: 28 February 2017
Publication: 19 April 2017
MS 342-205

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