珪藻および花粉分析からみた熊本平野西部の後期更新世〜完新世の体積環境解析

概要

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A drilling core from Kumamoto Port was analyzed based on changes of diatom and pollen assemblages. The diatom assemblages are divided into six zones as follows: Kd-1 : Pinnularia-Fragilaria zone Kd-2 : Rhopalodia gibberula-Hyalodiscus sp. -Coscinodiscus-Thalassionema nitzschioides zone Kd-3 : Hyalodiscus sp. -Cyclotella striata- Thalassionema nitzschioides zone Kd-4 : Paralia sulcata -Thallasionema nitzschioides-Cyclotella striata zone Kd-5 : Paralia sulcata zone Kd-6 : Coscinodiscus lineatus- C. excentrics-Rhopalodia gibberula zone. The pollen assemblages are also divided into five zones as follows: Sk-I : rare fossil pollen zone Sk-II : Pinus-Alnus zone Sk-III : Lepidobalanus-Ulmus/Zelkova-Carpinus zone Sk-IV : Cyclobalanopsis-Castanea/Castanopsis zone Sk-V : Pinus zone. Based on six radiocarbon ages, deposition of the areas was determined to have occurred during the Last Glacial Age of the Kumamoto Plain. 47,000-27,000cal BP : Kd-1 and Sk-1 27,000-15,000?cal BP : Kd-2 and Sk-II 15,000?-12,000cal BP : Kd-3 and Sk-II〜Sk-III 12,000-8,000cal BP : Kd-4 and Sk-III 8,000-1,500cal BP : Kd-5 and (Sk-III)-SK-IV 1,500-100?cal BP : KD-6 and Sk-V
熊本大学の論文
2006-03-30