湖成層の珪藻化石群集を用いた水域古環境解析 : その2 熊本県熊本市西部金峰山地域芳野層(中部更新統)

概要

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The Yoshino Formation is a middle Pleistocene lacustrine deposit in the western part of Kumamoto City. Iwauchi and Hase (1992) already performed pollen analyses of the columnar sections [1] and [2] from the Yoshino Formation, and carried out diatom analyses of the columnar sections [1], [2] and [4] and pollen analysis of the columnar section [4] (Figs. 1 and 3) ・Diatom assemblage zones of the columnar sections [1], [2] and [4]. Diatom analyses have yielded five diatom assemblage zones, which in ascending order are as follows : Cyclotella spp., Stephanodiscus sp. Zone (Yb-a) Cyclotella stelligera, Cyclotella meneghiniana, Aulacoseira spp. Zone (Yb-b) Cyclotella radiosa Zone (Y-a, Yb-c) Cyclotella spp. Zone (Y-b), Cyclotella stelligera, Stephanodiscus sp. Zone (Y'-a) Stephanodiscus sp. Zone (Y-c), Cyclotella radiosa, Aulacoseira spp. Zone (Y'-b) ・Pollen assemblage zones of the columnar section [4]. Pollen analysis has yielded six pollen zones : Fagus, Pinus Zone (Yb-I) Ulmus/Zelkova, Pinus Zone (Yb-II) Fagus Zone (Yb-III) Abies Zone (Yb-IV) Abies, Picea, Pinus Zone (Yb-V) Fagus, Lepidobalanus Zone (Yb-VI). The paleoenvironmental changes during the deposition of the Yoshino Formation were clarified based on diatom and pollen analyses.
熊本大学の論文
2006-03-30