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Color Change by Microstructure and Chemical Composition of Bivalve Fossils  

Yun, Cheol-Soo (Daegu Science High School)
Publication Information
Journal of the Korean earth science society / v.24, no.5, 2003 , pp. 402-410 More about this Journal
Abstract
When the bivalve fossil microstructure is observed on a thin section, the growth lines of the older specimens are mostly erased by calcite recrystallization while those of the younger are well preserved in detail. During the fossil diagenesis, the shells tend to darken gradually since the valve-forming component Ca$^{2+}$ is the replaced by the surrounding materials Fe$^{2+}$, Mg$^{2+}$, and Mn$^{2+}$. Therefore, the metallic ratio against Ca component in fossil was increased during diagenesis. The UV-Visible spectrophotometry analysis shows that the reflecting degree is low level in Cretaceous bivalve fossils in contrast to the Tertiary and Recent ones. This result suggests that the dark color in older bivalve fossils is affected by the replacement of the metal ions.
Keywords
bivalve; microstructure; recrystallization; fossil diagenesis; metal ions;
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Times Cited By KSCI : 1  (Citation Analysis)
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