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Table 1 Concentrations of major elements (average values of duplicate analyses), TC, TN, and TS in core Mw5S from L. Maruwan

From: Biogeochemistry and limnology in Antarctic subglacial weathering: molecular evidence of the linkage between subglacial silica input and primary producers in a perennially ice-covered lake

Depth Mid-depth MgO Al 2 O 3 SiO 2 K 2 O CaO TiO 2 MnO Fe 2 O 3 Carbon Nitrogen Sulfur C/N 14 C age δ 13 C δ 15 Ν
(cm) (wt%) (wt%)   (years BP)   (‰ vs. PDB) (‰ vs. Air)
0 to 2 1.0 3.0 10.5 46.6 3.4 2.8 0.91 0.17 7.5 1.3 0.00 0.3 - 1,350 40 −18.0 +6.6 (n = 2)
2 to 4 3.0 2.4 9.1 53.4 2.9 2.8 0.78 0.11 6.5 1.6 0.00   -     
4 to 6 5.0 0.5 4.1 67.6 1.6 2.1 0.35 0.05 3.9 2.5 0.30 1.2 8.5     +4.3 (n = 2)
6 to 8 7.0 0.0 3.2 67.2 1.4 1.9 0.30 0.05 3.7 2.8 0.36   7.9 3,950 30 −21.6 +3.1
8 to 10 9.0 0.7 5.9 59.3 2.2 2.5 0.50 0.07 5.0 2.3 0.27 1.6 8.7     
10 to 12 11.0 1.8 6.9 58.9 2.2 2.7 0.50 0.07 4.8 2.0 0.24   8.3 4,200 30 −20.8 (n = 2) +4.9 (n = 2)
12 to 13 12.5 1.4 6.2 60.7 1.9 2.6 0.43 0.07 4.3 1.9 0.23 1.2 8.1     
13 to 14 13.5 1.3 5.4 63.7 1.7 2.4 0.39 0.06 4.0 2.0 0.26   7.5     
14 to 16 15.0 1.7 7.0 58.3 1.9 2.9 0.45 0.07 4.8 0.7 0.00 1.1 -    −19.3 +5.9
16 to 18 17.0 0.0 2.0 67.2 1.0 1.8 0.21 0.04 3.0 2.3 0.27   8.7     
18 to 20 19.0 0.0 2.1 74.4 1.1 1.9 0.24 0.04 3.2 2.4 0.30 1.0 8.1 3,920 40 −23.6 +3.2
20 to 22 21.0 0.1 1.9 74.6 1.1 1.8 0.23 0.04 3.3 2.8 0.35   8.0     
22 to 24 23.0 0.3 3.8 65.8 1.5 2.1 0.31 0.05 3.9 3.1 0.37 1.5 8.5     
24 to 26 25.0 0.3 3.6 66.6 1.5 2.1 0.31 0.05 3.6 2.2 0.24   9.2 4,410 30 −20.5 +2.2
26 to 28 27.0 0.2 3.3 70.9 1.4 2.0 0.29 0.05 3.6 3.2 0.38 1.3 8.3     
28 to 30 29.0 0.0 1.4 74.7 0.9 1.6 0.22 0.04 2.6 3.0 0.36   8.2    −21.0 +4.3
30 to 32 31.0 0.0 0.9 67.3 0.7 1.5 0.13 0.05 2.8 2.7 0.35 1.1 7.8     
32 to 34 33.0 0.0 3.0 64.6 1.3 2.0 0.30 0.06 3.7 2.4 0.30   8.0 4,630 30 −21.0 +4.8
34 to 36 35.0 0.0 3.9 65.8 1.6 2.1 0.32 0.06 3.8 2.6 0.36 1.5 7.1    −20.9 +5.1
36 to 38 37.0 0.0 2.8 69.6 1.3 2.0 0.28 0.05 3.8 3.0 0.39   7.6     
38 to 40 39.0 0.1 3.1 71.9 1.3 2.0 0.30 0.05 3.7 2.4 0.32 1.1 7.5     
40 to 43 41.5 0.0 2.6 73.4 1.2 1.9 0.26 0.04 3.3 2.9 0.40   7.2    −20.4 +4.2 (n = 2)
43 to 46 44.5 0.0 2.7 60.8 1.2 1.9 0.23 0.04 2.8 2.6 0.36 1.3 7.1     
46 to 49 47.5 0.6 4.4 65.6 1.7 2.1 0.37 0.06 3.6 3.5 0.43   8.0 4,540 40   
49 to 52 50.5 1.0 6.1 62.6 2.0 2.3 0.46 0.06 4.0 2.7 0.31 1.0 8.8    −21.2 +5.8
52 to 55 53.5 1.1 6.8 59.0 2.2 2.5 0.51 0.07 4.2 2.3 0.28   8.1     
55 to 58 56.5 2.6 8.3 55.2 2.6 2.7 0.64 0.08 4.6 1.9 0.22 0.8 8.7     
58 to 61 59.5 1.8 8.1 55.6 2.6 2.7 0.62 0.08 4.5 2.4 0.24   9.9    −21.1 +5.7
61 to 64 62.5 0.2 3.3 72.0 1.3 1.9 0.27 0.05 2.9 2.8 0.36 0.9 7.9     
64 to 67 65.5 0.0 1.3 76.4 0.9 1.6 0.17 0.04 2.8 3.1 0.43   7.3     
67 to 70 68.5 0.0 1.5 76.4 0.9 1.7 0.18 0.04 2.8 3.0 0.40 1.1 7.6    −21.2 +5.4
70 to 75 72.5 0.0 0.7 79.0 0.7 1.5 0.14 0.03 2.1 3.8 0.50   7.7 5,220 40   
75 to 80 77.5 0.0 0.5 78.5 0.6 1.5 0.12 0.03 2.0 2.8 0.34 0.7 8.4     
80 to 85 82.5 0.0 0.4 80.9 0.6 1.4 0.10 0.03 1.7 3.3 0.48   6.9    −20.6 +4.9
85 to 90 87.5 0.0 0.0 83.2 0.4 1.4 0.07 0.02 1.4 3.1 0.38 0.6 8.2     
90 to 95 92.5 0.0 0.3 82.1 0.5 1.4 0.09 0.02 1.6 2.9 0.35   8.3 5,520 90 −21.2  
95 to 100 97.5 0.0 0.2 80.9 0.6 1.5 0.11 0.03 1.7 3.1 0.37 0.7 8.3    −21.8 +4.5
100 to 105 102.5 0.0 1.0 77.4 0.8 1.6 0.15 0.03 2.2 3.1 0.39   7.8     
105 to 110 107.5 0.0 0.8 78.5 0.8 1.6 0.14 0.03 2.0 2.8 0.35 0.8 7.9 5,400 30 −20.9  
110 to 115 112.5 0.0 0.3 79.4 0.7 1.6 0.12 0.03 2.0 3.2 0.40   8.0     
115 to 120 117.5 0.0 0.4 80.6 0.6 1.5 0.11 0.03 1.7 3.0 0.40 0.8 7.6    −20.9 +4.2
120 to 125 122.5 0.0 0.6 80.7 0.6 1.4 0.11 0.02 1.6 3.3 0.44   7.5     
125 to 130 127.5 0.0 0.3 81.7 0.5 1.4 0.10 0.02 1.4 3.1 0.42 0.7 7.4 5,350 40 −17.0 +2.4
130 to 135 132.5 0.0 1.7 75.3 0.9 1.7 0.18 0.04 2.3 2.6 0.32   8.2     
135 to 140 137.5 0.0 1.7 76.0 0.9 1.7 0.18 0.03 2.3 2.7 0.34 0.9 7.9     
140 to 145 142.5 0.0 1.0 79.1 0.7 1.6 0.13 0.03 1.9 2.8 0.38   7.3     
145 to 150 147.5 0.0 1.2 77.7 0.9 1.8 0.17 0.04 2.4 2.4 0.31 0.8 7.8     
150 to 156 153.0 0.0 0.6 79.8 0.7 1.6 0.12 0.03 1.8 2.7 0.33   8.3 6,010 70 −21.4 (n = 2) +4.5
  1. Radiocarbon (14C age), carbon, and nitrogen isotopic compositions at corresponding depths are also shown.