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Volbers, Andrea N A; Henrich, Rüdiger (2002): G. bulloides dissolution index of surface sediments. PANGAEA,, Supplement to: Volbers, ANA; Henrich, R (2002): Present water mass calcium carbonate corrosiveness in the eastern South Atlantic inferred from ultrastructural breakdown of Globigerina bulloides in surface sediments. Marine Geology, 186(3-4), 471-486,

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The Atlantic is regarded as a huge carbonate depocenter due to an on average deep calcite lysocline. However, calculations and models that attribute the calcite lysocline to the critical undersaturation depth (hydrographic or chemical lysocline) and not to the depth at which significant calcium carbonate dissolution is observed (sedimentary calcite lysocline) strongly overestimate the preservation potential of calcareous deep-sea sediments. Significant calcium carbonate dissolution is expected to begin firstly below 5000 m in the deep Guinea and Angola Basin and below 4400 m in the Cape Basin. Our study that is based on different calcium carbonate dissolution stages of the planktic foraminifera Globigerina bulloides clearly shows that it starts between 400 and 1600 m shallower depending on the different hydrographic settings of the South Atlantic Ocean. In particular, coastal areas are severely affected by increased supply of organic matter and the resultant production of metabolic CO2 which seems to create microenvironments favorable for dissolution of calcite well above the hydrographic lysocline.
Related to:
Volbers, Andrea N A (2001): Planktic foraminifera as paleoceangraphic indicators: Production, preservation, and reconstruction of upwelling intensity. Implications from late quarternary South Atlantic sediments. Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen, 184, 114 pp, urn:nbn:de:gbv:46-00101382-15
Median Latitude: -15.764260 * Median Longitude: 0.853111 * South-bound Latitude: -30.750000 * West-bound Longitude: -14.903330 * North-bound Latitude: 3.156667 * East-bound Longitude: 15.210000
Date/Time Start: 1988-02-20T00:00:00 * Date/Time End: 1998-05-08T17:15:00
Minimum DEPTH, sediment/rock: 0.0 m * Maximum DEPTH, sediment/rock: 0.0 m
GeoB1001-1 * Latitude: -5.866000 * Longitude: 11.972167 * Date/Time: 1988-02-20T00:00:00 * Elevation: -45.0 m * Recovery: 0.52 m * Location: Angola Basin * Campaign: M6/6 * Basis: Meteor (1986) * Method/Device: Giant box corer (GKG) * Comment: Tonschlamm, Rippeln
GeoB1004-2 * Latitude: -6.099683 * Longitude: 12.127017 * Date/Time: 1988-02-20T00:00:00 * Elevation: -30.3 m * Penetration: 0.26 m * Recovery: 0.25 m * Location: Angola Basin * Campaign: M6/6 * Basis: Meteor (1986) * Method/Device: Giant box corer (GKG) * Comment: Grobsand, braun, Schill
GeoB1005-2 * Latitude: -6.235450 * Longitude: 11.502183 * Date/Time: 1988-02-20T00:00:00 * Elevation: -237.0 m * Penetration: 0.55 m * Recovery: 0.52 m * Location: Walvis Ridge * Campaign: M6/6 * Basis: Meteor (1986) * Method/Device: Giant box corer (GKG) * Comment: Ton, olivgrüngrau, Forams.
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Latitude of eventLatitude
2Longitude of eventLongitude
3Event labelEvent
4Elevation of eventElevationm
5DEPTH, sediment/rockDepth sedmGeocode
6Globigerina bulloides dissolution index (Volbers)BDX´Volbers, Andrea N ACalculated, see reference(s)
7Sample code/labelSample labelVolbers, Andrea N A
255 data points

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