| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1987: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1986: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Research Abstract |
We studied the planktic foraminiferal biostratigraphy partly combined with magnetostratigraphy of the Pliocene strata distributed in the Okinawa, Miyazaki, Nabari, Yotsukura and Nakajo areas. Detailed correlation done by present study enable us to reconstruct precise paleoceanography and paleogeography in Pliocene in order of 0.1 Ma resolution.
Planktic foraminiferal biostratigraphy was made on the Neogene strata in the Fujikawa area of the southern Fossa-Magna region (Oda et et., 1987, Fossil, vol43). Paleogeography and paleoceanography of the Fossa-Magna region and its surrounding areas, central Japan, During the Middle Miocene has been presumed by the paleobathymetric and sedimentologic data and biogiographic connections of planktic foraminifera under the detailed correlation of the Neogene strata distributed in the Fujikawa, Shinshu, Boso, Kakegawa and Takasaki areas. The Kofu sea way between the southern and northern areas of the Fossa-Magna region existed in the early Middle Miocene when the warm surface water prevailed and also in the middle Middle Miocene when the cool surface water flowed from north to south. However, in the late Middle Miocene, the sea way has colsed due to the uplifting the Kanto and Koma massifs and the circulation patterns of surface water changed radically owing to the creation of the geographic Barrier.
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