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Machiyama, Hideaki; Yamada, Tsutomu; Kaneko, Naotomo; Iryu, Yasufumi; Odawara, Kei; Asami, Ryuji; Matsuda, Hiroki; Mawatari, Shunsuke F; Bone, Yvonne; James, Noel P (2003): Carbonate mineralogy and stable isotope composition of cool-water bryozoans from sediments of ODP Leg 182 sites [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.786019, Supplement to: Machiyama, H et al. (2003): Carbon and oxygen isotopes of cool-water bryozoans from the Great Australian Bight and their paleoenvironmental significance. In: Hine, AC; Feary, DA; Malone, MJ (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 182, 1-29, https://doi.org/10.2973/odp.proc.sr.182.007.2003

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Abstract:
The carbon and oxygen isotopic compositions of selected bryozoan skeletons from upper Pleistocene bryozoan mounds in the Great Australian Bight (Ocean Drilling Program Leg 182; Holes 1129C, 1131A, and 1132B) were determined. Cyclostome bryozoans, Idmidronea spp. and Nevianipora sp., have low to intermediate magnesian calcite skeletons (1.5-10.0 and 0.9-6.4 molar percentage [mol%] MgCO3, respectively), but a considerable number include marine cements. The cheilostome Adeonellopsis spp. are biminerallic, principally aragonite, with some high magnesian calcite (HMC) (6.6-12.1 mol% MgCO3). The HMC fraction of Adeonellopsis has lower d13C and similar d18O values compared with the aragonite fraction. Reexamination of modern bryozoan isotopic composition shows that skeletons of Adeonellopsis spp. and Nevianipora sp. form close to oxygen isotopic equilibrium with their ambient water. Therefore, changes in glacial-interglacial oceanographic conditions are preserved in the oxygen isotopic profiles. The bryozoan oxygen isotopic profiles are correlated well with marine isotope Stages 1-8 in Holes 1129C and 1132B and to Stages 1-4(?) in Hole 1131A. The horizons of the bryozoan mounds that yield skeletons with heavier oxygen isotopic values can be correlated with isotope Stages 2, 4(?), 6, and 8 in Hole 1129C; Stages 2 and 4(?) in Hole 1131A; and Stages 2, 4, 6, and 8 in Hole 1132B. These results provide supporting evidence for a model for bryozoan mound formation, in which the mounds were formed during intensified upwelling and increased trophic resources during glacial periods.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -33.309669 * Median Longitude: 128.246847 * South-bound Latitude: -33.326100 * West-bound Longitude: 127.602200 * North-bound Latitude: -33.296560 * East-bound Longitude: 128.481300
Date/Time Start: 1998-11-16T13:38:00 * Date/Time End: 1998-11-26T18:30:00
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. Machiyama, H; Yamada, T; Kaneko, N et al. (2003): (Table T1-2) Stable carbon and oxygen isotope ratios of cool-water Bryozoa Adeonellopsis spp. from ODP Leg 182 sites. https://doi.org/10.1594/PANGAEA.786016
  2. Machiyama, H; Yamada, T; Kaneko, N et al. (2003): (Table T1-1) Aragonite and calcite composition, and magnesium content of cool-water bryozoans from ODP Leg 182 sites. https://doi.org/10.1594/PANGAEA.786015
  3. Machiyama, H; Yamada, T; Kaneko, N et al. (2003): (Table T1-3) Stable carbon and oxygen isotope ratios of cool-water Bryozoa Idmidronea spp. from ODP Leg 182 sites. https://doi.org/10.1594/PANGAEA.786017
  4. Machiyama, H; Yamada, T; Kaneko, N et al. (2003): (Table T1-4) Stable carbon and oxygen isotope ratios of cool-water Bryozoa Nevianipora sp. from ODP Leg 182 sites. https://doi.org/10.1594/PANGAEA.786018