Mohtadi, Mahyar; Max, Lars; Hebbeln, Dierk; Baumgart, Anne; Krück, Nils; Jennerjahn, Tim C (2010): Surface sediment samples from several fore-arc basins west and southwest of the Indonesian Archipelago, analyzed by planktonic foraminifera, stable oxygen and carbon isotopic signals and opal and CaCO3 contents in bulk sediment [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.733340, Supplement to: Mohtadi, M et al. (2007): Modern environmental conditions recorded in surface sediment samples off W and SW Indonesia: Planktonic foraminifera and biogenic compounds analyses. Marine Micropaleontology, 65(1-2), 96-112, https://doi.org/10.1016/j.marmicro.2007.06.004
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Abstract:
A total of 69 surface sediment samples from several fore-arc basins located west and southwest of the Indonesian Archipelago was analyzed with respect to the faunal composition of planktonic foraminifera, the stable oxygen and carbon isotopic signal of a surface-dwelling (Globigerinoides ruber) and a thermocline-dwelling (Neogloboquadrina dutertrei) species, and the opal and CaCO3 contents in bulk sediment. Our results show that the distribution pattern of opal in surface sediments corresponds well to the upwelling-induced chlorophyll concentration in the upper water column and thus, represents a reliable proxy for marine productivity in the coastal upwelling area off S and SW Indonesia. Present-day oceanography and marine productivity are also reflected in the tropical to subtropical and upwelling assemblages of planktonic foraminifera in the surface sediments, which in part differ from previous studies in this region probably due to different coring methods and dissolution effects. The average stable oxygen isotopic values (d18O) of G. ruber in surface sediments vary between 2.9 per mill and 3.2 per mill from basin to basin and correspond to the oceanographic settings during the SE monsoon (July-October) off west Sumatra, whereas off southern Indonesia, they reflect the NW monsoon (December-March) or annual average conditions. The d18O values of N. dutertrei show a stronger interbasinal variation between 1.6 per mill and 2.2 per mill and correspond to the upper thermocline hydrology in July-October. In addition, the difference between the shell carbon isotopic values (d13C) of G. ruber and N. dutertrei (Delta d13C) appears to be an appropriate productivity recorder only in the non-upwelling areas off west Sumatra. Consequently, joint interpretation of the isotopic values of these species is distinctive for different fore-arc basins W and SW of Indonesia and should be considered in paleoceanographic studies.
Project(s):
Coverage:
Median Latitude: -2.377252 * Median Longitude: 102.918557 * South-bound Latitude: -9.729167 * West-bound Longitude: 95.331100 * North-bound Latitude: 3.874500 * East-bound Longitude: 121.152167
Date/Time Start: 2005-08-06T04:29:00 * Date/Time End: 2006-10-03T03:49:00
Event(s):
GeoB10008-4 * Latitude: -0.954833 * Longitude: 98.259833 * Date/Time: 2005-08-06T04:29:00 * Elevation: -934.0 m * Campaign: SO184/1 (PABESIA) * Basis: Sonne * Method/Device: MultiCorer (MUC) * Comment: 6/6 4/4
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
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2 datasets
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Datasets listed in this publication series
- Mohtadi, M (2010): (Table 1) Stable oxygen and carbon isotopes, and relative abundances, of selected planktonic foraminiferal species together with biogenic compounds in the surface sediment samples retrieved during the SO-184 cruise off Wand SW Indonesia. https://doi.org/10.1594/PANGAEA.733331
- Mohtadi, M (2010): (Table 2) Stable oxygen and carbon data, and relative abundances of selected planktonic foraminiferal species in the surface sediment samples retrieved during the SO-189 cruise off W Sumatra. https://doi.org/10.1594/PANGAEA.733339