Publication Date:
2024-02-03
Description:
During the "Meteor“-Expedition to the Persian Gulf in March-May 1965, approximately 300 samples were collected. Most of them have been already studied by various authors in sedimentological as well as micropaleontological respects. 49 samples were selected for ostracode studies. These samples are arranged to form a long-axis section ("Laengsprofil“), and 4 shorter cross-profiles, perpendicular to the long-axis profile in the Persian Gulf and Gulf of Oman.
52 species of ostracodes in this area were specifically determined; 39 of them are described under open nomenclature. 13 species are already known from surrounding sea areas: 2 species from the Red Sea; 2 species from the east coast of Africa; 1 species from the Mediterranean Sea; and others from the Indian and Pacific Oceans. 12 species show close relationships to species from the Indopacific Ocean. The ostracode species found in the area can be grouped after the method of BRAUN-BLANQUT into 2 bioassociations.
Association 1 with the following 4 characteristic species : Cytherella cf. pulchra, Loxoconcha sp. A, Neomonoceratina sp. A, Alocopocythere reticulata. Association 2 with 1 characteristic species: Ruggieria (Ruggieria) sp. B.
The association 1 is widespread in the entire studied area of the Persian Gulf, where it is considered to characterize the shallow water region down to 200 m. The association 2 is restricted to the deeper water below 200 m of the inner part of the Oman Gulf. Only a few species known from the shallow water association of the Persian Gulf are present.
Within the two ostracode associations mentioned above 4 zones from the total studied area could be related to the water depth.
The zones A-D are characterized more or less readily by the relative abundance of certain species:
Zone A : 7-30 m depth, on substrates of poorly coarse-grained clayey marl;
Zone B: 30-94 m depth, on substrates of richly coarse-grained calcareous marl;
Zone C: 94-1961208 m depth, on substrates of richly coarse-grained calcareous marl;
Zone D: 196/208-500 m depth, on substrates of calcareous clay, poor in benthos.
The regional and bathymetric distribution of the ostracode fauna in the area studied was compared in relation to 10 environmental factors: water depth, temperature, salinity, water density, O2-concentration, phosphate-silica contents, pH-values, stratification of the water body, water currents and type of sediments.
The major environmental factors which appear to control the ostracode distribution are water depth (as a complex factor), O2-concentration and the type of sediment.
At 3 stations (GIK01058, GIK01074 and GIK01204) species of the shallow water association were found together with a few bathyal species. These stations are situated at the outer Biaban shelf, in an area where the bottom water of the Persian Gulf flows down the slope towards the Oman Gulf.
Several samples of the Zone B in the major part of the Persian Gulf show also a high species diversity containing a high percentage of subfossil ostracode carapaces. It is probable that the recent biocoenosis has been mixed with a late quarternary thanatocoenosis.
Keywords:
GIK/IfG; GIK01056; GIK01057; GIK01058; GIK01059; GIK01060; GIK01061; GIK01068; GIK01074; GIK01082; GIK01083; GIK01084; GIK01085; GIK01086; GIK01087; GIK01088; GIK01096; GIK01103; GIK01105; GIK01106; GIK01112; GIK01122; GIK01134; GIK01135; GIK01143; GIK01152; GIK01153; GIK01154; GIK01156; GIK01157; GIK01172; GIK01173; GIK01174; GIK01175; GIK01181; GIK01183; GIK01187; GIK01190; GIK01191; GIK01194; GIK01196; GIK01197; GIK01198; GIK01199; GIK01202; Gravity corer (Kiel type); IIOE - International Indian Ocean Expedition; Institute for Geosciences, Christian Albrechts University, Kiel; KAL; Kasten corer; M1; M1_251; M1_252 01057-C; M1_253; M1_254 01059-B; M1_255; M1_256; M1_263; M1_269; M1_277; M1_278 01083-B; M1_279 01084-B; M1_280A; M1_280B; M1_280C 01087-B; M1_281 01088-C; M1_289 01096-B; M1_294; M1_296 11105-3; M1_297 11106-2; M1_303 11112-1; M1_313 11122-2; M1_324 11134-1; M1_326 01135-B; M1_330B 01143-B; M1_338 01152-B; M1_339 11053-1; M1_340 01154-B; M1_342; M1_342A 01156-B; M1_351; M1_352 01173-C; M1_353 01174-B; M1_354 01175-B; M1_359 11081-2; M1_361 01183-B; M1_365 01187-C; M1_368 01190-C; M1_369; M1_372; M1_374 01196-C; M1_375; M1_376 01198-B; M1_377 01199-G; M1_380; Meteor (1964); Persian Gulf; SL
Type:
Dataset
Format:
application/zip, 3 datasets
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