Table 1 Maximum trace metal concentrations and enrichments Mesoproterozoic shales and modern sediments from anoxic environments
From: Highly fractionated chromium isotopes in Mesoproterozoic-aged shales and atmospheric oxygen
Formation | age | Mo | Mo/Al | Mo/Ti | V | V/Al | V/Ti | U | U/Al | U/Ti | Cr | Cr/Al | Cr/Ti | ref |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Zhengjiaya | 1100 | 76 | 25 | 490 | 990 | 330 | 6400 | 13 | 4.3 | 83 | 76 | 34 | 650 | this study |
Wenshuihe | 1200 | 36 | 33 | 23 | 270 | 40 | 190 | 6.7 | 1 | 4.4 | 260 | 38 | 170 | this study |
Taizi | 1330 | 107 | 51 | 530 | 1340 | 520 | 6700 | 13 | 11 | 103 | 310 | 72 | 880 | this study |
Dayanping | 1400 | 1.8 | 0.34 | 3.6 | 200 | 41 | 370 | 2.4 | 0.47 | 4.5 | 107 | 21 | 270 | this study |
Velkerri | 1400 | 120 | 37 | 420 | 560 | 160 | 2000 | 12 | 4.2 | 48 | 48 | 14 | 160 | |
Xiamaling | 1390 | 48 | 8.2 | 150 | 820 | 130 | 2300 | 14 | 2.3 | 39 | 65 | 11 | 170 | |
Black Sea (unit 1) | 0 | 121 | 32 | 680 | 180 | 56 | 1160 | 16 | 5.4 | 110 | 63 | 13 | 280 | |
Peru (OMZ) | 0 | 96 | 24 | 95 | 410 | 130 | 2500 | 34 | 9.7 | 202 | 150 | 50 | 1100 | |
Cariaco Basin | 0 | 84 | 14 | 420 | 210 | 35 | 1000 | 135 | 18 | 350 | ||||
Saanich Inlet | 0 | 69 | 13 | 200 | 150 | 31 | 510 | 90 | 18 | 270 | ||||
Crustal average | 0 | 1.1 | 0.13 | 2.9 | 97 | 12 | 260 | 2.7 | 0.33 | 7.1 | 92 | 11 | 240 |
