Li, Jingfen (2003): Neogene calcareous nannofossil biostratigraphy and the Coccolithus pelagicus abundance of ODP Leg 186 cores from the Japan Trench

Leg/Site/Hole:
ODP 186
ODP 186 1150
ODP 186 1151
Identifier:
2004-011514
georefid

10.2973/odp.proc.sr.186.101.2003
doi

Creator:
Li, Jingfen
Florida State University, Department of Geology, Tallahassee, FL, United States
author

Identification:
Neogene calcareous nannofossil biostratigraphy and the Coccolithus pelagicus abundance of ODP Leg 186 cores from the Japan Trench
2003
In: Suyehiro, Kiyoshi, Sacks, I. Selwyn, Acton, Gary D., Acierno, Michael J., Araki, Eiichiro, Ask, Maria V. S., Ikeda, Akihiro, Kanamatsu, Toshiya, Kim, Gil Young, Li, Jingfen, Linde, Alan T., McWhorter, Paul N., Mora, German, Najman, Yanina M. R., Niitsuma, Nobuaki, Pandit, Benoy K., Roller, Sybille, Saito, Saneatsu, Sakamoto, Tatsuhiko, Shinohara, Masanao, Sun, Yue-Feng, Proceedings of the Ocean Drilling Program, scientific results, Western Pacific geophysical observatories; covering Leg 186 of the cruises of drilling vessel JOIDES Resolution; Yokohama, Japan, to Yokohama, Japan; sites 1150 and 1151, 14 June-14 August 1999
Texas A&M University, Ocean Drilling Program, College Station, TX, United States
186
Calcareous nannofossil assemblages were studied from Ocean Drilling Program Holes 1150A, 1150B, 1151A, 1151C, and 1151D in order to estimate the age of sediments drilled in the Japan Trench of the western Pacific Ocean. The abundance and species diversity of nannofossil flora are generally low but are sufficient to show that the sedimentary sequences range from Quaternary to Miocene in age (nannofossil Zones CN15-CN3). The abundance of Coccolithus pelagicus, a cold-water indicator, was studied from sediments younger than 3.83 Ma from both Holes 1150A and 1151A in order to elucidate past climate conditions. Between 3.83 and 2.82 Ma, the abundance of C. pelagicus was generally low, but abundance increased significantly after 2.82 Ma. In agreement with previous studies, this increase appears to be related to a change in the current system around the western Pacific Ocean and eastern Atlantic Ocean that occurred in response to the final elevation of the Isthmus of Panama.
English
Coverage:Geographic coordinates:
North:39.1100
West:143.2000East: 143.2000
South:38.4500

Stratigraphy; algae; biostratigraphy; biozones; calcareous composition; Cenozoic; Coccolithophoraceae; Coccolithus; Coccolithus pelagicus; cores; Japan Trench; Leg 186; marine environment; marine sediments; microfossils; nannofossils; Neogene; North Pacific; Northwest Pacific; Ocean Drilling Program; ODP Site 1150; ODP Site 1151; Pacific Ocean; paleo-oceanography; paleoclimatology; paleoecology; Plantae; reconstruction; sediments; Tertiary; West Pacific;

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