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| Titel |
Modern Foraminifera from a depth transect offshore Brunei Darussalam:
diversity, sedimentation rate and preservation pathways. |
| VerfasserIn |
Antonino Briguglio, Sulia Goeting, Rosnani Kusli, Amajida Roslim, Gianluca Polgar, Laszlo Kocsis |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250125883
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| Publikation (Nr.) |
 EGU/EGU2016-5536.pdf |
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| Zusammenfassung |
| For this study, 11 samples have been collected by scuba diving from 5 to 35 meters water
depth off shore Brunei Darussalam. The locations sampled are known as: Pelong Rock (5
samples, shallow reef with soft and stony corals and larger foraminifera, 5 to 8 meters water
depth), Abana Rock (1 sample, shallow reef with mainly soft corals and larger foraminifera,
13 to 18 meters water depth), Oil Rig wreck (1 sample, very sandy bottom with larger
foraminifera, 18 meters water depth), Dolphin wreck (1 sample, muddy sand with many small
rotaliids, 24 meters water depth), US wreck, (1 sample, sand with small clay fraction,
28 meters water depth), Australian wreck (1 sample, mainly medium to coarse
sand with larger foraminifera, 34 meters water depth) and Blue water wreck (1
sample, mainly coarse sand, coral rubble and larger foraminifera, 35 meters water
depth).
Those samples closer to the river inputs are normally richer in clay, while the most distant
samples are purely sandy. Some additional samples have been collected next to reef
environments which, even if very shallow, are mainly sandy with almost no clay fraction. The
deepest sample, which is 30 km offshore, contains some planktonic foraminifera and is
characterized by a large range of preservations concerning foraminifera, thus testifying the
presence or relict sediments at the sea bottom. The presence of relict sediments was already
pointed out by older oil-related field studies offshore Brunei Darussalam, and now it is
possible to draw the depth limit of these deposits.
The diversity of the benthic foraminiferal fauna is relatively high but not as higher as
neighboring regions as some studies have highlighted. The species collected and
identified are more than 50: in reef environment the most abundant are Calcarina
defrancii, Neorotalia calcar and the amphisteginidae; deeper in the muddy sediments
the most abundant is Pararotalia schroeteriana and in the deepest sandy sample
the most abundant are Calcarina hispida, followed by Operculina ammonoides. |
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