Totally 2472 grains of Radiolaria belonging to 36 Genera and 45 species are distinguished from 12 surface sediments in the Bering Sea. The distribution characteristics of Radiolaria fossils in the surface sediments are as follows: (1) From the shelf of shallow water to the upper of continental slope, there are a few Radiolaria fossils and monotonous genus and species; (2) In the lower of continental slope, Radiolaria fossils are poor in the volcanic cinders and turbidite; (3) The abundance and diversity of Radiolaria fossils are high in clay of the basin. The dominant species of Radiolaria is Spongotrochus glacialis on the continental shelf. Current, topography, water depth, and temperature etc. are key factors influencing Radiolaria distribution. The sources of sediments mainly are terrigenous, biogenic and volcanic sediments in the survey area and they are mostly from the Kamchatka peninsula in the east of Russia and the Aleutian Islands.
Radiolaria fossils in the surface sediments and sedimentary environment in the Bering Sea
1 Arsenev (1967): Currents and water masses of the Bering Sea (in Russian, English summary). Izd. Nauka, Moscow. (Transl., 1968, Nat. Mar. Fish. Serv., Northwest Fish. Center, Seattle), 135 (as quoted in Takenouti and Ohtani, 1974).
2 Joseph JM, Jeanne CS (1985): Antarctic Radiolaria in late Winter/early Spring Weddell Sea Waters. M icropaleontology, 31 (4): 365 371.
3 Kinder TH, Coachman LK, Galt JA (1975): The Bering Slope current system. J. Phys. Oceanogr., 5: 231 -244. DOI:10.1175/1520-0485(1975)005<0231:TBSCS>2.0.CO;2
4 Li YF, Zhang QS (1996): Microfossil groups and paleoenvironment significance at core AB-27 in the Barrow of Alaska. Acta Geography Sinica, 51 (3): 252 259.
5 Lisitzin AP (1969): Recent sedimentation in the Bering Sea. In: Bezrukov PL, ed. Akademiya Nauk SSSR, Inst. Okeanologii (Transl. Isr. Prog. Sci. Translations. Public., Jerusalem), 614.
6 Nativkin DV (1960): The Geology of the USSR, A: Short Outline. New York: Pergamon.
7 Naidu AS, Han MW, Mowatt TC, Wajda W (1995): Clay minerals as indicators of sources of terrigenous sediments, their transportation and deposition: Bering Basin, Russiamlaskan Arctic. Marine Geology, 127: 87 104. DOI:10.1016/0025-3227(95)00053-2
8 Naidu AS, Mowatt TC (1983): Sources and dispersal patterns of clay minerals in surface sediments from the continental-shelf areas off Alaska. Geol. Soc. Am. Bull., 94: 841 854. DOI:10.1130/0016-7606(1983)94<841:SADPOC>2.0.CO;2
9 Okkonen SR (1993): Circulation variability in the Bering Sea. Ph. D. Thesis, Fairbanks, Univ. Alaska, 126.
10 Royer TC, Enery WJ (1984): Circulation in the Bering Sea, 1982 1983, based on sateUit e tracked drifter observation. J. Phys. Oceanogr., 14: 1914 1919. DOI:10.1175/1520-0485(1984)014<1914:CITBSB>2.0.CO;2
11 SchoU DW, Buffington EC, Hopkins DM, Alpha TR (1970): The structure and origin of the large submarine canyons of the Bering Sea. Mar. Geol., 8: 187 210. DOI:10.1016/0025-3227(70)90043-5
12 Stabeno PJ, Reed RK (1994): Circulation in the Bering Sea Basin observed by satellite-tracked drifters: 1986 1993. J. Phys. Oceanogr., 24: 848 854. DOI:10.1175/1520-0485(1994)024<0848:CITBSB>2.0.CO;2
13 Takenouti, Ohtani (1974): Currents and water masses in the Bering Sea: a review of Japanese work. In: Hood DW and Kelley EJ, ed. Oceanography of the Bering Sea. Inst. Marine Sci., Univ. Alaska, Fairbanks, 39 58.
14 Zonnenshain LP, Kuzmin MI, Natapov LM (1990): Koryak-Kamchatka foldbelt. In: Page BM, ed. Geology of the USSR: A Plate-Tectonic synthesis. (Geodynamics Ser., 21.) Am. Geophys. Union, Washington D. C., 149- 167.