Figure 3: | Scientific Reports

Figure 3

From: Generalized conditions of spherical carbonate concretion formation around decaying organic matter in early diagenesis

Figure 3

SXAM mapping and ‘L’ of concretions. The reaction front ‘L’ identified by SXAM mapping of syn-genetically formed concretions (A; Teshio, B; Yatsuo and C; Morozaki). (A) Ca (b), Mn (c), Fe (d) distributions and L1 (e) defined by Ca profile. Teshio concretions have diameters of 1~2 cm and very thin reaction fronts (L1) of 1 mm. (B) Ca (b), Mn (c), Fe (d) distributions and L2 (e) defined by Ca profile. Tusk-shell (Fissidentalium spp.) concretions with a diameter of up to 1.5~3 cm and reaction fronts (L2) a few mm wide. (C) Ca (b), Mn (c), Fe (d) distributions and L3 (e) defined by Ca profile. Morozaki ‘ghost shrimp’ concretions formed around Callianassa spp. have diameters of 3~7 cm with reaction fronts of 3~6 mm (L3). SXAM Ca X-ray intensity in and around the cut surface of a concretion shows a sharp boundary ‘L’ between the concretion and matrix defined by Ca concentration gradients. Colour bar shows X-ray intensity of all measured elements. All photographs (AC) shown here are taken by H.Yoshida.