Recent and fossil benthic Foraminifera and late Cenozoic palaeobathymetry of Seram, eastern Indonesia
van Marle, L.J. (1989). Recent and fossil benthic Foraminifera and late Cenozoic palaeobathymetry of Seram, eastern Indonesia. Neth. J. Sea Res. 24(4): 445-457
In: Netherlands Journal of Sea Research. Netherlands Institute for Sea Research (NIOZ): Groningen; Den Burg. ISSN 0077-7579; e-ISSN 1873-1406, more
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| Abstract |
Analyses of the benthic foraminiferal content of two middle Pliocene-Pleistocene sections on the Island Seram showed the species composition to remain more or less constant throughout both sections. A palaeodepth of 400 to 1100 m is concluded, based on quantitative correlation of the late Cenozoic benthic foraminiferal associations with the bathymetric distribution of modern benthic Foraminifera in 35 selected box-core top samples from the Australian-Irian Jaya continental margin. The depth-positions of maximum positive Z-score values of selected autochtonous species and their overlapping depth-ranges allow for a more precise interpretation falling within the depth-interval of 600 to 900 m. The autochtonous fossil species are tolerant to oxygen depletion. Laminated silty-clayey intervals within the sections, lacking bioturbation, also suggest low-oxygen bottom conditions. High P/B ratios indicate enhanced productivity in the surface waters, implying a high trophic level. |
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