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Jenkyns, Hugh C; Gröcke, Darren R; Hesselbo, Stephen P (2001): Carbon and nitrogen isotopic composition of Early Toarcian sediments [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.846587, Supplement to: Jenkyns, HC et al. (2001): Nitrogen isotope evidence for water mass denitrification during the Early Toarcian (Jurassic) oceanic anoxic event. Paleoceanography, 16(6), 593-603, https://doi.org/10.1029/2000PA000558

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Abstract:
Bulk sedimentary nitrogen isotope (d15Ntot) data have been generated from Lower Jurassic black, carbon-rich shales in the British Isles and northern Italy deposited during the early Toarcian oceanic anoxic event. A pronounced positive d15Ntot excursion through the exaratum Subzone of the falciferum Zone (defined by characteristic ammonites in the British Isles) broadly correlates with a relative maximum in weight percent total organic carbon and, in some sections, with a negative d13Corg excursion. Upwelling of a deoxygenated water mass that had undergone partial denitrification is the likely explanation for relative enrichment of d15Ntot, and parallels may be drawn with Quaternary sediments of the Arabian Sea, Gulf of California, and northwest Mexican margin. The development of Early Toarcian suboxic water masses and consequent partial denitrification is attributed to increases in organic productivity. Approximately coincident phenomena include the following: a relative climatic optimum, realignment of major oceanic current systems, and a possible release of methane gas hydrates from continental margin sediments early in the history of the oceanic anoxic event.
Coverage:
Median Latitude: 51.127500 * Median Longitude: 1.605000 * South-bound Latitude: 46.450000 * West-bound Longitude: -4.150000 * North-bound Latitude: 54.460000 * East-bound Longitude: 13.320000
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Jenkyns, HC; Gröcke, DR; Hesselbo, SP (2001): Stable isotopic composition of Toarcian samples from Dogna, north Italy, Bellungo Trough. https://doi.org/10.1594/PANGAEA.846560
  2. Jenkyns, HC; Gröcke, DR; Hesselbo, SP (2001): Stable isotopic composition of Toarcian samples from Hawsker Bottoms, Yorkshire, Cleveland Basin. https://doi.org/10.1594/PANGAEA.846584
  3. Jenkyns, HC; Gröcke, DR; Hesselbo, SP (2001): Stable isotopic composition of Pliensbachian-Toarcian samples from Mochras Borehole, Gwynedd, Wales, Cardigan Bay Basin. https://doi.org/10.1594/PANGAEA.846585
  4. Jenkyns, HC; Gröcke, DR; Hesselbo, SP (2001): Stable isotopic composition of Pliensbachian-Toarcian samples from Winterborne Kingston Borehole, Dorset, Wessex Basin. https://doi.org/10.1594/PANGAEA.846586