Machiyama, Hideaki et al. (2004): Carbon and oxygen isotopes of cool-water bryozoans from the Great Australian Bight and their paleoenvironmental significance
Leg/Site/Hole:
Related Expeditions:
ODP 182
Identifier:
ID:
2005-041673
Type:
georefid
ID:
10.2973/odp.proc.sr.182.007.2003
Type:
doi
Creator:
Name:
Machiyama, Hideaki
Affiliation:
Japan Marine Science and Technology Center, Deep Sea Research Department, Kanagawa, Japan
Role:
author
Name:
Yamada, Tsutomu
Affiliation:
Australian Geological Survey Organisation, Australia
Role:
author
Name:
Kaneko, Naotomo
Affiliation:
Texas A&M University, United States
Role:
author
Name:
Iryu, Yasufumi
Affiliation:
Eidgenoessische Technische Hochschule-Zentrum, Switzerland
Role:
author
Name:
Odawara, Kei
Affiliation:
Johann Wolfgang Goethe-Universitaet, Federal Republic of Germany
Role:
author
Name:
Asami, Ryuji
Affiliation:
Eckerd College, United States
Role:
author
Name:
Matsuda, Hiroki
Affiliation:
University of Southern Mississippi, United States
Role:
author
Name:
Mawatari, Shunsuke F.
Affiliation:
University of Hawaii, United States
Role:
author
Name:
Bone, Yvonne
Affiliation:
University of New Mexico, United States
Role:
author
Name:
James, Noel P.
Affiliation:
Natural History Museum, United Kingdom
Role:
author
Identification:
Title:
Carbon and oxygen isotopes of cool-water bryozoans from the Great Australian Bight and their paleoenvironmental significance
Year:
2004
Source:
In: Hine, Albert C., Feary, David A., Malone, Mitchell J., Andres, Miriam, Betzler, Christian, Brooks, Gregg R., Brunner, Charlotte A., Fuller, Michael, Molina Garza, Roberto S., Holbourn, Ann E., Huuse, Mads, Isern, Alexandra R., James, Noel P., Ladner, Bryan C., Li, Qianyu, Machiyama, Hideaki, Mallinson, David J., Matsuda, Hiroki, Mitterer, Richard M., Robin, Cecile, Russell, Joellen L., Shafik, Samir, Simo, J. A., Smart, Peter L., Spence, Guy H., Surlyk, Finn C., Swart, Peter K., Wortmann, Ulrich G., Proceedings of the Ocean Drilling Program; scientific results; Great Australian Bight; Cenozoic cool-water carbonates; covering Leg 182 of the cruises of the drilling vessel JOIDES Resolution; Wellington, New Zealand, to Fremantle, Australia; Sites 1126-1134, 8 October-7 December 1998
Publisher:
Texas A&M University, Ocean Drilling Program, College Station, TX, United States
Volume:
182
Issue:
Pages:
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 delta (super 13) C and similar delta (super 18) O 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.
Language:
English
Genre:
Serial
Rights:
URL:
Coverage: Geographic coordinates: North:-33.1723 West:127.3608 East:
128.2852 South:-33.1934
Keywords: Isotope geochemistry; Australasia; Australia; biostratigraphy; Bryozoa; C-13/C-12; carbon; Cenozoic; cores; geochemistry; Great Australian Bight; Indian Ocean; Invertebrata; isotope ratios; isotopes; Leg 182; O-18/O-16; Ocean Drilling Program; ocean floors; ODP Site 1129; ODP Site 1131; ODP Site 1132; oxygen; paleo-oceanography; paleoecology; paleoenvironment; Pleistocene; Quaternary; reconstruction; stable isotopes; upper Pleistocene;
.