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Smrzka, Daniel; Zwicker, Jennifer; Klügel, Andreas; Monien, Patrick; Bach, Wolfgang; Bohrmann, Gerhard; Peckmann, Jörn Ludwig (2016): Geochemistry of carbonate sample. PANGAEA,, Supplement to: Smrzka, D et al. (2016): Establishing criteria to distinguish oil-seep from methane-seep carbonates. Geology, 44(8), 667-670,

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Hydrocarbon seeps harbor copious chemosynthesis-dependent life, the traces of which are preserved in the fossil record within authigenic carbonates. These environments are mostly characterized by seepage of methane-rich fluids, yet numerous crude oil-dominated seeps have been discovered in recent years. Oil seepage has a profound influence on the local fauna, but recognizing such seeps in the rock record remains elusive. This study presents new geochemical data that will allow for a more confident identification of ancient oil-seep deposits. Geochemical data from modern and ancient seep limestones reveal that oil-dominated seep carbonates are enriched in rare earth elements and uranium compared to their methane-dominated counterparts. These trace element patterns have the potential to serve as a basis for an improved understanding of the adaptation of chemosynthetic life to oil seepage, and to better constrain the marine carbon cycle in the geologic past.
Median Latitude: 31.988419 * Median Longitude: -27.998302 * South-bound Latitude: 24.580133 * West-bound Longitude: -123.320000 * North-bound Latitude: 47.150000 * East-bound Longitude: 63.994067
Date/Time Start: 2003-11-06T17:24:00 * Date/Time End: 2007-11-20T16:30:00
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