Radiolarian assemblage and environmental changes in the Japan Sea since the late Miocene

Author(s): Kamikuri, Shin-ichi; Motoyama, Isao
Author Affiliation(s): Primary:
Hokkaido University, Faculty and Graduate School of Science, Hokkaido, Japan
University of Tsukuba, Japan
Volume Title: Kaseki Fossils
Source: Tokyo [Kaseki = Fossils, Vol.82, p.35-42. Publisher: Palaeontological Society of Japan,], Japan. ISSN: 0022-9202
Note: In Japanese with English summary. 41 refs.; illus., incl. 1 table, sketch map
Summary: Radiolarians live in a depth range from the surface to the great depths in the modern ocean, They, therefore, have much potential to reconstruct past vertical water structure as well as surface layer environments. To reconstruct paleoceanographic changes in the Japan Sea during the last 8 million years., we analyzed radiolarian assemblages in a deep-sea sedimentary sequence from the central part of the sea. Our results revealed that the surface layer changed from a warm condition in the late Miocene to a cooler one in the late Pliocene with some fluctuations and cooling steps that occurred at 6.5, 3.5 and 2.5 Ma. Warm water inflows from the south do not seem to have existed before the mid-Pliocene time. The signal of such inflow that can be comparable to the present-day Tsushima Current first appeared at 2.2 Ma. Occurrence of the deep as well as intermediate water species indicates the presence of deep and intermediate water masses comparable to those of the modern North Pacific before 2.5 Ma. The faunal composition of the deep and intermediate water species abruptly changed at 2.5 Ma, indicating that the formation of more oxygen-rich deep water initiated at that time in the sea. The reconstructed history of vertical water masses suggests exchanges of the deep water between the Japan Sea and the adjacent Pacific Ocean and, thus, deep channels are expected to have existed between them before the mid-Pliocene. Diversity of radiolarian assemblages in the Japan Sea was constantly lower than that of the North Pacific during the studied time interval.
Year of Publication: 2007
Research Program: DSDP Deep Sea Drilling Project
ODP Ocean Drilling Program
Key Words: 10 Paleontology, Invertebrate; 12 Stratigraphy, Historical Geology and Paleoecology; Assemblages; Cenozoic; DSDP Site 302; Deep Sea Drilling Project; Emperor Seamounts; Faunal list; Invertebrata; Japan Sea; Leg 145; Leg 186; Leg 31; Marine environment; Microfossils; Miocene; Neogene; North Pacific; Northwest Pacific; ODP Site 1151; ODP Site 884; Ocean Drilling Program; Pacific Ocean; Paleo-oceanography; Paleoenvironment; Pleistocene; Pliocene; Protista; Quantitative analysis; Quaternary; Radiolaria; Tertiary; Upper Miocene; West Pacific; Yamato Basin
Coordinates: N402007 N402008 E1365401 E1365400
N384500 N384500 E1432000 E1432000
N512702 N512702 E1682013 E1682013
Record ID: 2010042758
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.