JpGU-AGU Joint Meeting 2017

Presentation information

[EJ] Poster

B (Biogeosciences) » B-PT Paleontology

[B-PT04] [EJ] Evolution of Chemosynthetic Ecosystem in Earth History

Sun. May 21, 2017 1:45 PM - 3:15 PM Poster Hall (International Exhibition Hall HALL7)

convener:Robert Jenkins(School of Natural System, College of Science and Engineering, Kanazawa University), Hiromi Kayama WATANABE(Japan Agency for Marine-Earth Science and Technology), Takami Nobuhara(Science Education (Geology), Faculty of Education, Shizuoka University), Ryuichi Majima(Faculty of Education and Human Sciences, Yokohama National University)

[BPT04-P08] Relationship between various elements in shells and crystal form of CaCO3 constituting inside seashell All over Japan

*Chihiro Takayama1, Mana Yasui2, Hiroshi Hagiya1 (1.Tokyo City University, 2.Waseda University)

Keywords:biomineral, calcite, aragonite, element

Seashell and coral contains mainly inorganic substances are consisted by calcium carbonate and partially organic substances.The seashell consists various combination of Calcite and Aragonite.
In this study, seashells collected on the coast of 10 areas in Japan have analyzed the crystal structure and the elements concentration.
And inorganic elements [Ca,Na,P,Si,Sr,Zr,Y,Rb,S] concentration of seashells are considered from relationship between the crystal structure and each element concentration.
Calcites contain more P and S than Aragonites, Aragonites contain more Sr and Zr than Calcites
There is a strong correlation between Sr and Zr concentration in the seashell.
Also Corals and Barnacles, contain more Sr and Zr than seashells sample.
Zr element is concentrated to 106 times the concentration of seawater.
Y element is also concentrated to 105 times the concentration of seawater. But Y element isn’t correlation the other elements.
It is considered that there are some unknown reason in biomineraligation of seashell.