日本地球惑星科学連合2015年大会

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インターナショナルセッション(口頭発表)

セッション記号 B (地球生命科学) » B-PT 古生物学・古生態学

[B-PT03] Biocalcification and the Geochemistry of Proxies -Field ecology, Laboratory culture and Paleo

2015年5月26日(火) 14:15 〜 16:00 104 (1F)

コンビーナ:*豊福 高志(独立行政法人海洋研究開発機構)、北里 洋(独立行政法人海洋研究開発機構海洋・極限環境生物圏領域)、Jelle Bijma(アルフレッドウェゲナー極域海洋研究所)、座長:豊福 高志(独立行政法人海洋研究開発機構)

15:10 〜 15:35

[BPT03-15] 生体由来および生体模倣カルサイト結晶におけるメソテクスチャー構造

*今井 宏明1宮島 諒一1緒明 佑哉1小暮 敏博2 (1.慶應義塾大学理工学部、2.東京大学大学院理学系研究科)

The mesoscale granular textures having a single crystalline feature are generally observed on the continuous body of various biogenic and biomimetic calcite crystals. The distribution of the organic phase and lattice strain in the textured crystals vary with organism species or the growth conditions. The prismatic layer of a fan mussel, A. pectinata, exhibits a relatively homogeneous, low-strain texture consisting of the nanoscale grains with discrete organic inclusions; the prism structure of a pearl oyster, P. fucata, and an avian eggshell have a high-strain granular texture with localized organic phases. A variety of the mesoscopic textures similar to the biogenic calcite crystals are artificially produced in a supersaturated solution containing specific organic molecules. The high-strain textures were produced through mesoscopic dendritic growth of calcite by physical impedance of a rigid gel matrix and subsequent thickening of the branches. Continuous growth of the crystal involving nanoscale segregation of soluble polymers would result in the formation of the low-strain body having mesoscopic textures. The chemical durability of the low-strain biogenic and biomimetic textured calcites are enhanced by the combination of the inorganic crystal and the organic molecules.