Table 1 Trace element analysis by ICP-MS.

From: Anthropogenic Anoxic History of the Tuvalu Atoll Recorded as Annual Black Bands in Coral

Conc. [mg/L]

Cr

Mn

Fe

Ni

Cu

Zn

Cd

Pb

Std: JCp-1*

0.14

0.52

—

4.2

0.68

0.42

0.03

0.18

Fg 01–1 (Black)

1.3

0.9

43.1

4.2

3.4

7.5

0.1

0.6

Fg 01–1 (White)

1.5

1.3

168.1

5.0

1.8

7.6

0.1

0.7

Fg 01–5

3.1

0.5

26.6

3.6

6.2

2.7

0.0

0.2

Fh 11–1

1.7

0.3

21.3

3.3

3.1

3.8

0.0

0.1

Fh11–3D

0.8

0.5

23.7

4.1

1.8

1.8

0.0

0.1

  1. Coral powder was obtained from the two sampling areas, namely, the top and bottom of the fg01 (two red dotted frames in Fig. 1d are denoted fg01–1 and fg01–5) and fh11 (two blue dotted frames in Fig. 2c are denoted fh11–1 and fh11–3D) cores. fg01–1 (black) represents the CBBs, and fg01–1 (white) represents the space between CBBs, as shown in Fig. 4c. The concentrations of the heavy metal elements included in JCp-1, which was used as a standard coral, were based on the values reported by Inoue et al. (2004)32. *JCp-1: Inoue et al., 2004.
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