Modern environmental conditions recorded in surface sediment samples off W and SW Indonesia: planktonic foraminifera and biogenic compounds analyses

Mohtadi, Mahyar, Max, Lars, Hebbeln, Dierk, Baumgart, Anne, Krück, Nils C. and Jennerjahn, Tim (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. doi:10.1016/j.marmicro.2007.06.004


Author Mohtadi, Mahyar
Max, Lars
Hebbeln, Dierk
Baumgart, Anne
Krück, Nils C.
Jennerjahn, Tim
Title Modern environmental conditions recorded in surface sediment samples off W and SW Indonesia: planktonic foraminifera and biogenic compounds analyses
Journal name Marine Micropaleontology   Check publisher's open access policy
ISSN 0377-8398
1872-6186
Publication date 2007-10-29
Sub-type Article (original research)
DOI 10.1016/j.marmicro.2007.06.004
Volume 65
Issue 1-2
Start page 96
End page 112
Total pages 17
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Formatted 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 (δ18O) of G. ruber in surface sediments vary between 2.9‰ and 3.2‰ 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 δ18O values of N. dutertrei show a stronger interbasinal variation between 1.6‰ and 2.2‰ and correspond to the upper thermocline hydrology in July–October. In addition, the difference between the shell carbon isotopic values (δ13C) of G. ruber and N. dutertrei δ13C) 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.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Biological Sciences Publications
 
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Created: Thu, 28 Aug 2014, 02:37:25 EST by Nils Krueck on behalf of School of Biological Sciences