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Paleoenvironmental Analysis in Late Cenozoic Era of Kyushu.

九州新生代晚期古环境分析。

基本信息

批准号：
01540646
负责人：
HASE Yoshitaka
金额：
$ 0.32万
依托单位：
Kumamoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

项目摘要

Fossil floras from the late Cenozoic lacustrine and inner bay sediments in Kyushu were recognized as Nakayama (late Miocene), Hirakuni and Kuroki (early Pliocene), Shigehira and Otagawa (early Pliocene), Nagano, Daiwa, Hitoyoshi, Tsunematsu and Amari (late Pliocene), Yamanokuchi, Aira, Hosenji (early Pleistocene), Yoshida, Tsuetate and Oyama (early to middle Pleistocene), Tsumori, Yoshino, Nogami and Asono (middle Pleistocene), Ebino, Uchitachi, Shinkai and Aso-3/-4 sediments (middle to late Pleistocene), Iino-Kakuto (late Pleistocene), Shimabarakaiwan and Uchinomaki (late Pleistocene to Holocene) and Ariake clay (Holocene). The compositions of the fossil floras suggest that the climate changed several times from cool temperate to warm temperate conditions and the vegetations were coniferous, mixed broad-leaved and coniferous, deciduous broad-leaved, and evergreen and deciduous broad-leaved forests. It is assumed that the annual temperature based on the percentages of trees with entire-margined leaves (Wolfe, 1978) and warm elements (Hase, 1988) oscillated between about 5^ﾟ and 20 ^ﾟ during late Miocene to Holocene in Kyushu.The Toriyamahama Formation deposited under the condition of transgression in late Pleistocene in the east coast of Kyushu. The four molluscan assemblages were recognized as Corbicula, Crassostrea-Cerithidea, Protothaca, and Haustator-Dosinia in the area.The biostratigraphy of the Miyazaki Group in late Pliocene was clarified by the analysis of planktonic foraminiferan from the formations distributed in the northern part of Miyazaki Plain.

九州新生代晚期湖泊和内湾沉积物中的化石植物群被认为是中山（中新世晚期）、平国和黑木（上新世早期）、茂平和太田川（上新世早期）、长野、大和、人吉、常松和甘利（上新世晚期），山之口、爱良、法泉寺（早更新世）、吉田、杖立和小山（早更新世至中更新世）、津森、吉野、野上和阿园（中更新世）、虾野、内立、新海和 Aso-3/-4 沉积物（中更新世至晚更新世）、饭野角斗（晚更新世）更新世）、Shimabarakaiwan 和 Uchinomaki（晚更新世至全新世）和有明粘土（全新世）。化石植物区系的组成表明，气候从冷温带到暖温带发生了多次变化，植被为针叶林、阔叶混交林、落叶阔叶林、常绿落叶阔叶林。据推测，九州晚中新世至全新世期间，基于全缘叶树比例(Wolfe，1978)和暖元素(Hase，1988)的年气温在5^ﾟ至20^ﾟ之间波动。鸟山滨组是在晚更新世海侵条件下沉积于九州东海岸的。该地区的四种软体动物组合分别为Corbicula、Crassostrea-Cerithidea、Protothaca和Haustator-Dosinia。通过对宫崎平原北部分布地层中浮游有孔虫的分析，阐明了上新世晚期宫崎群的生物地层。