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American Mineralogist; November 2006; v. 91; no. 11-12; p. 1937-1940; DOI: 10.2138/am.2006.2391
© 2006 Mineralogical Society of America
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Crystallographic alignments in a coccolith (Pleurochrysis carterae) revealed by electron back-scattered diffraction (EBSD)

Kazuko Saruwatari1,*, Noriaki Ozaki1, Hiromichi Nagasawa2 and Toshihiro Kogure1

1 Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
2 Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, the University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo, 113-8657, Japan


Figure 1
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  		FIGURE 1. SEM images of coccoliths viewed from (a) the distal and (b) the proximal sides with inclination of 70° from the horizontal. Insets in the top-right of both figures are schematic cross sections adapted from Marsh (1999). The elements colored with light blue and light pink indicate single V- and R-units, respectively. The distal shields (d), outer tube elements (o), organic base plate (b), proximal shields (p), and inner tube elements (i) are indicated in the figures. The arrow in a indicates the point from which the EBSD pattern in Figure 2Go was acquired.

 

Figure 2
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  		FIGURE 2. (a) EBSD pattern acquired from the arrowed point in Figure 1aGo. (b) Calculated Kikuchi pattern corresponding to the EBSD pattern in a. (c) Stereographic projections of [100], [Formula0], and [001] directions, showing the crystal orientation determined by EBSD analysis. The origin in the stereo net corresponds to the normal of the substrate. (d) Top view of the coccolith in Figure 1aGo. The arrows are projections of [100] (orange) and [001] (red) directions superimposed on the analyzed V-units. The numbers are angles inclined upward from the horizontal surface.

 

Figure 3
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  		FIGURE 3. SEM images of coccoliths observed perpendicularly from the (a) distal and (b) proximal side. The arrows are the same ones in Figure 2dGo, showing the projections of [100] and [001] directions determined by the EBSD analyses.

 

Figure 4
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  		FIGURE 4. Atomic arrangements of Ca (filled circles) and C (smaller open circles) on the calcite {0Formula4} and {2Formula0} planes that are close to the bottom planes of the V- and R-units, respectively, and so are possibly in contact with the organic base plate. The {2Formula0} plane is viewed along the [100] direction. The directions of the coccolith rim are also shown as broken lines.

 




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