Japan Geoscience Union Meeting 2016

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Oral

Symbol M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS13] Evolution of the Pelagic Realm

Mon. May 23, 2016 10:45 AM - 12:15 PM 203 (2F)

Convener:*Atsushi Matsuoka(Department of Geology, Faculty of Science, Niigata University), Toshiyuki Kurihara(Graduate School of Science and Technology, Niigata University), Yasuhiro Kato(Department of Systems Innovation, Graduate School of Engineering, University of Tokyo), Tetsuji Onoue(Earth and Environmental Sciences, Graduate School of Science and Technology, Kumamoto University), Katsunori Kimoto(Japan Agency for Marine-Earth Science and Technology), Tatsuo Nozaki(Research and Development Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology), Hayato Ueda(Department of Geology, Niigata University), Kenta Kobayashi(Department of Geology, Faculty of Science, Niigata University), Takashi Hasegawa(Division of Global Environmental Science and Engineering, Graduate School of Natural Science and Technology, Kanazawa University), Chair:Tetsuji Onoue(Earth and Environmental Sciences, Graduate School of Science and Technology, Kumamoto University), Atsushi Matsuoka(Department of Geology, Faculty of Science, Niigata University)

11:45 AM - 12:00 PM

[MIS13-11] Parameter identification of mathematical models based on three dimensional information of planktic foraminiferal shell structure obtained by Microfocus X-ray CT

★Invited papers

*Naoko Kishimoto1, Katsunori Kimoto2 (1.Setsunan University, 2.Japan Agency for Marine-Earth Science and Technology)

Keywords:Microfocus X-ray CT, Mathematical Model, functional morphology, Planktic foraminifera

Morphological variations in microfossils like foraminifers and radiolarians might have the meaning of various functions for their evolution and adaptation in the geological history. In order to quantitatively understand such morphological variations, it is important to parameterize the morphological features in microfossils. We obtained precise morphology of a modern planktic foraminifera Globigerinoides ruber (d’Orbigny) using Micro-Xray Computed Tomography (Micro-XCT) technique, and developed numerical approximate models to validate the parameterization by experimental rules used the sequentially connected spheres. Our approximate spherical model clarified that several parameters including radius ratio, distances of geometric centers in each chambers are almost constant, and others such as revolving angle between adjacent chambers are gradually transformed associated with growth of G. ruber, It indicates that previous numerical model could not interpret whole morphology of this species. The coupling of mathematical model and Micro-XCT technique has the great potential to realize various forms of microfossils and understand its functional morphology.