| Benthic foraminiferal distribution in surface sediments along continental slope of the southern Okinawa Trough: dependance on water masses and food supply |
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| 作者姓名： | Xiang Rong Li Tiegang Yang Zuosheng Yan Jun Cao Qiyuan |
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| 作者单位： | 向荣(College of Marine Geosciences,Ocean University of China(Ocean University of Qingdao),Qingdao 266003,China;Institute of Oesnology,Chinese Academy of Sciences,Qingdao 266071,China);李铁刚,阎军,曹奇原(Institute of Oesnology,Chinese Academy of Sciences,Qingdao 266071,China);杨作升(College of Marine Geosciences,Ocean University of China(Ocean University of Qingdao),Qingdao 266003,China) |
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| 基金项目： | 国家自然科学基金，中国科学院科研项目 |
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| 摘 要： | Benthic foraminiferal analysis of 29 samples in surface sediments from the southern Okinawa Trough is carried out.The results indicate that benthic foraminiferal abundance decreases rapidly with increasing water depth.Percentage frequencies of agglutinated foraminifera further confirm the modern shallow carbonate lysocline in the southern Okinawa Trough.From continental shelf edge to the bottom of Okinawa Trough,benthic foraminiferal fauna in the surface sediments can be divided into 5 assemblages:(1) Continental shelf break assemblage,dominated by Cibicides pseudoungerianus,corresponds to subsurface water mass of the Kuroshio Current;(2) upper continental slope assemblage,dominated by Cassidulina carinata,Globocassidulina subglobosa,corresponds to intermediate water mass of the Kuroshio Current;(3) intermediate continental slope assemblage,dominated by Uvigerina hispida,corresponds to the Okinawa Trough deep water mass above the carbonate lysocline.
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| 关 键 词： | Benthic foraminifer southern Okinawa Trough dissolution Kuroshio food supply |
| 收稿时间： | 2002/10/10 0:00:00 |
| 修稿时间： | 2002/11/20 0:00:00 |
Benthic foraminiferal distribution in surface sediments along continental slope of the southern Okinawa Trough: dependance on water masses and food supply |
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| Xiang Rong,Li Tiegang,Yang Zuosheng,Yan Jun,Cao Qiyuan.Benthic foraminiferal distribution in surface sediments along continental slope of the southern Okinawa Trough: dependance on water masses and food supply[J].Acta Oceanologica Sinica,2003,22(1):133-143. |
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| Authors: | Xiang Rong Li Tiegang Yang Zuosheng Yan Jun and Cao Qiyuan |
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| Institution: | 1.College of Marine Geosciences, Ocean University of China(Ocean University of Qingdao), Qingdao 266003, China;Institute of Oeanology, Chinese Academy of Sciences, Qingdao 266071, China2.Institute of Oeanology, Chinese Academy of Sciences, Qingdao 266071, China3.College of Marine Geosciences, Ocean University of China(Ocean University of Qingdao), Qingdao 266003, China |
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| Abstract: | Benthic foraminiferal analysis of 29 samples in surface sediments from the southern Oki-nawa Trough is carried out. The results indicate that benthic foraminiferal abundance decreases rapidlywith increasing water depth. Percentage frequencies of agglutinated foraminifera further confirm themodem shallow carbonate lysocline in the southern Okinawa Trough. From continental shelf edge to thebottom of Okinawa Trough, benthic foraminiferal fauna in the surface sediments can be divided into 5assemblages: (1) Continental shelf break assemblage, dominated by Cibicides pseudoungerianus, corre-sponds to subsurface water mass of the Kuroshio Current; (2) upper continental slope assemblage, domi-nated by Cassidulina carinata, Globocassidulina subglobosa, corresponds to intermediate water mass of the Kuroshio Current; (3) intermediate continental slope assemblage, dominated by Uvigerina hispi-da, corresponds to the Okinawa Trough deep water mass above the carbonate lysocline; (4) lower con-tinental slope- trough bottom assemblage, dominated by Pullenia bulloides, Epistominella exigua andCibicidoides hyalinus, corresponds to deep water mass of the Okinawa Trough; and (5) trough bottomagglutinated assemblage, dominated by Rhabdammina spp., Bathysiphon flavidus, corresponds tostrongly dissolved environment of the trough bottom. The benthic foraminiferal fauna in the southemOkinawa Trough are controlled jointly by water masses and food supply. Water temperature, oxygenconcentration and carbonate dissolution of the water masses are important controlling factors especiallyfor the continental shelf break and trough bottom assemblages. The food supply also plays an importantrole in these benthic foraminiferal assemblages along the westem slope of the Okinawa Trough. Both theabundance and the 5 assemblages of benthic foraminifera correspond well to the organic matter supplyalong the continental slope and a lateral transport of TSM (total suspended matter) and POC (particulateorganic carbon) from the shelf break to the deep water is also an important food supply for benthic faunain this region. |
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| Keywords: | Benthic foraminifer southern Okinawa Trough dissolution Kuroshio food supply |
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