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Preiß-Daimler, Inga; Baumann, Karl-Heinz; Henrich, Rüdiger (2012): Mass estimates and morphometric meassurements of Discoaster species and Sphenolithus from Ceara Rise ODP Site 927. PANGAEA,, Supplement to: Preiß-Daimler, I et al. (2012): Carbonate budget mass estimates for Neogene discoasters from the Equatorial Atlantic (Ceara Rise: ODP Site 927). Journal of Micropalaeontology, 31(2), 169-178,

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Mass estimates for Late Miocene and Pliocene (8.6-3.25 Ma) Discoaster species and Sphenolithus are determined using samples of the equatorial Atlantic (Ceara Rise: ODP Site 927). Based on morphometric measurements, 3D computer models were created for 11 Discoaster species and their volumes calculated. From these, shape factors (ks) were derived to allow calculation of mass for different-sized discoasters and Sphenolithus abies. The mass estimates were then used to calculate the contribution of nannofossils to the total nannofossil carbonate. The discoaster contribution ranges from 10% to 40%, with a decreasing trend through the investigated interval. However, our estimates of total nannofossil carbonate from size-corrected abundance data are consistently 30-50% lower than estimates from grain-size measurement; this suggests that data based on mass estimates need to be interpreted with caution.
Latitude: 5.462867 * Longitude: -44.480567
Date/Time Start: 1994-02-28T00:00:00 * Date/Time End: 1994-03-04T00:00:00
Minimum Elevation: -3326.7 m * Maximum Elevation: -3326.7 m
154-927 * Latitude: 5.462867 * Longitude: -44.480567 * Date/Time Start: 1994-02-28T00:00:00 * Date/Time End: 1994-03-04T00:00:00 * Elevation: -3326.7 m * Penetration: 840.7 m * Recovery: 846.2 m * Location: South Atlantic Ocean * Campaign: Leg154 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 89 cores; 840.7 m cored; 0 m drilled; 100.7% recovery
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1SpeciesSpeciesPreiß-Daimler, Inga
2Area in square milimeterAreamm2Preiß-Daimler, IngaImage analysis
3Ray lengthr1µmPreiß-Daimler, IngaImage analysis
4Half ray widthd1µmPreiß-Daimler, IngaImage analysis
5Ray tip baser2µmPreiß-Daimler, IngaImage analysis
6RadiusRadiusµmPreiß-Daimler, IngaImage analysis
2482 data points

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