【作者】 林和茂； 朱雄华；

【Author】 Lin Hemao Zhu Xionghua (Institute of Marine Geology,Ministry of Geology & mineral Resources)

【机构】 地质矿产部海洋地质研究所；

【摘要】 <正>生物化石是确定古沉积环境的重要依据之一。第四纪以来的微古化石群与现代微体生物群较为相近。因此,深入开展现代近岸浅海及沿岸滨海各种环境中微体生物分布规律的研究,对于恢复我国沿海地区,第四纪以来古地理环境及研究海平面变化的历史,具有重要意义。近年来,在这方面国内不少学者作了许多工作,已取得了良好的效果。更多还原

【Abstract】 Twenty six samples were collected from surface sedimentes within water depth of 2 to 13.6m in the eastern part of Laizhou Bay which is the sou- thern part of the Bohai Gulf.The maximum monthly average temperature of the sea water is 27.4℃ in August,the minimum about 0℃ in January— February,and the maximum salinity in the summer(June—Aug.)is 30.38% and the minimum in the winter(Nov.—Dec.)is 25.83‰ according to the data of 1981—1983.Sixty nine species belonging to 30 genera of Foraminifera were found and regarded as one assemblage named Protelphi- dium tuberculatum d’Orbigny—Elphidium magellanicum Heron Allen and Earland assemblage dominated by those two leading taxa.The numbers of Foraminiferai species within variability total only 15(Living+dead tests)and 9 for the living.According to percent differences of some species and the diversity between the subtidal zone(2—5m water depth)and the offshore zone(5—13.6m water depth)subassemblages may be subdivided thirty three ostracode species belonging to 23 genera were identified and regarded as one assemblage too,i.e.Sinocytheridea latiovava—Echinocy- thereis bradyi assemblage,among which 12(total)and 14(living)species are referred to the uumber within variability.The more abundant Ostracod species are as follows:Sinocytheridea latiovata Hou et Chen(29.6%), Echinocytheris bradyi Ishizaki(20.2%),Bicornucythere bisanensis(Okubo) (12.8%),Neomonoceratina crispata Hu(10.0%)and Loxoconcha tarda Guan(7.2%).The controlling factors on the distribution of Foraminifera and Ostracoda are also discussed.更多还原