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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/100/1694

Title: Oxygen and carbon isotopic variation in co-existing larger foraminifera from a reef flat at Akajima, Okinawa, Japan
Authors: SARASWATI, PK
SETO, K
NOMURA, R
Keywords: planktic foraminifera
calcium carbonate
fractionation
photosymbiosis
delta-o-18
symbiosis
trends
c-13
Issue Date: 2004
Publisher: ELSEVIER SCIENCE BV
Citation: MARINE MICROPALEONTOLOGY,50,339-349
Abstract: The larger foraminiferal assemblage on. the reef flat at Akajima (Ryukyu Island Arc) is comprised of Marginopora kudakajimaensis, Amphisorus hemprichii, Sorites orbiculus, Peneroplis planatus, Heterostegina depressa, Neorotalia calcar, Calcarina gaudichaudii, Baculogypsina sphaerulata and Amphistegina lessonii. The oxygen and carbon isotopic variations in several specimens of each species, living under similar conditions, were examined. Symbiosis had little to no effect on oxygen isotopic composition of the bulk carbonate of the analysed species. The isotopic analysis along the ontogenetic stages indicates near-equilibrium precipitation of oxygen isotopes in the early life stages and, therefore, the initial chambers should be microsampled in isotopic analyses for a better estimate of palaeotemperature. The order of depletion of delta(13)C parallels the order of accretion of calcium carbonate by the foraminiferal species. A poor correlation between delta(18)O and delta(13)C and a large variation in delta(18)O and delta(13)C with size of the shell are the characteristic features of the symbiont-bearing benthic foraminifera inhabiting, reef flat environments. In a deeper water species oxygen isotopic values vary little with size of the shell. (C) 2003 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/S0377-8398(03)00099-9
http://dspace.library.iitb.ac.in/xmlui/handle/10054/14862
http://hdl.handle.net/100/1694
ISSN: 0377-8398
Appears in Collections:Proceedings papers

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