Dawashan

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Location - China

Age (of protore) - Ordovician: 444 Ma

Original size - 0.48 million tonnes of Mn

References

Fan, D-L., Hein, J.R., and Ye, J., 1999, Ordovician reef-hosted Jiaodingshan Mn-Co deposit and Dawashan Mn deposit, Sichuan Province, China: Ore Geology Reviews, v. 15, p. 135-151.

major elements - trace elements - rare-earth elements - REE normalized - isotopes

Major Elements, oxide percent
		%	%	%	%	%	%	%	%	%	%	%
		MnO	Fe₂O_3t	SiO₂	Al₂0₃	CaO	MgO	K₂O	Na₂O	TiO₂	P₂0₅	LOI	TOC %
Average	Mn ore	34.5	3.30	7.24	1.84	14.0	0.22	5.07	0.11	0.06	0.17	32.8
K-8	Rhodochrosite ore	50.9	4.25	4.08	0.26	6.12	0.02	2.08	0.02	–	0.27	32.4
K-3	Rhodochrosite ore	46.8	7.64	3.93	0.66	5.79	0.01	2.36	0.02	0.02	0.21	30.7
K-6-1	Rhodochrosite ore	41.8	2.32	9.31	2.77	5.55	0.02	6.31	0.27	0.08	0.17	30.2
K-37	Ca-rhodochrosite ore	30.0	2.45	7.63	2.95	18.5	0.78	4.79	0.02	0.03	0.11	32.3
K-35	Ca-rhodochrosite ore	29.5	1.95	7.60	1.09	19.4	0.31	3.43	0.33	0.03	0.14	35.8	1.01
K-6-2	kutnahorite;	26.6	4.08	14.3	5.06	9.2	0.04	10.8	0.16	0.24	0.16	27.8
K-15	Ca-rhodochrosite ore	25.5	1.56	6.18	1.38	23.4	0.43	5.37	0.03	0.01	0.15	35.0
K-14	Ca-rhodochrosite ore	24.8	2.13	4.91	0.52	23.9	0.14	5.40	0.03	0.01	0.13	37.8	1.86
K-36	Mn-limestone	8.98	1.58	7.37	1.77	38.2	0.59	3.58	0.03	0.07	0.07	36.8
K-1	shale	2.92	12.4	43.2	17.1	2.67	6.88	5.27	0.08	0.78	0.23	9.22	0.39
K-16	shale	0.77	5.95	54.3	14.7	3.56	5.20	2.99	0.10	0.62	0.19	11.2	2.28

Trace elements, ppm

ppm

MnO

avg high Mn carb

35.0

3169

282

0.99

242

144

4.7

207

115

K-8

50.9

362

33.4

406

16.8

1.07

151

197

5.43

64.4

124

K-3

46.8

4681

38.1

374

75.6

1.67

233

244

6.2

117

83.2

163

K-6-1

41.8

8928

354

22.1

1.17

617

180

5.71

271

56.4

203

K-37

30.0

203

11.5

237

8.99

0.75

14.4

104

4.3

85.6

54.4

17.2

K-35

29.5

182

94.6

250

18.2

0.83

171

112

3.94

170

32.5

K-6-2

26.6

10557

174

214

28.2

1.1

563

124

5.42

473

55.5

327

K-15

25.5

353

35.9

215

9.15

0.83

117

97.7

3.63

300

38.8

46.5

K-14

24.8

86.4

24.2

208

23.7

0.52

72.5

94.1

3.31

177

48.4

10.3

K-36

8.98

185

31.3

98.2

5.78

0.28

60.2

1.83

353

112

59.2

K-1

2.92

3459

60.9

171

58.8

1.38

694

129

5.86

94.9

79.4

577

K-16

0.77

2439

140

210

148

1.24

546

90.2

121

577

695

blank or nr = not reported; bd = below detection

Rare-earth elements, ppm

Rare-earth elements,

normalized to chondritic values of Taylor & McLennan (1992)

Isotopes
Sample	lithology	δ³⁴S ore, sulfide	%S host	δ³⁴S host, sulfide	δ¹³C pdb	δ¹⁸O pdb	δ¹⁸O smow	MnO %	CaO %	⁸⁷Sr/⁸⁶Sr
avg	Mn ore				-13.0	-8.41	22.2	35.0	14.7
K-3a	Rhodochrosite ore				-12.0	-8.70	21.9	46.8	5.79
K-3b	Rhodochrosite ore				-11.0	-11.3	19.2	46.8	5.79
K-6-1	Rhodochrosite ore				-10.3	-8.80	21.8	41.8	5.55
K-35a	Ca-rhodochrosite ore				-15.6	-7.70	22.9	29.5	19.4
K-35b	Ca-rhodochrosite ore				-10.5	-6.90	23.7	29.5	19.4
K-15a	Ca-rhodochrosite ore				-15.5	-8.00	22.6	25.5	23.4
K-14a	Ca-rhodochrosite ore				-16.3	-7.50	23.1	24.8	23.9
K-36	Mn-limestone				-7.0	-10.8	19.7	8.98	38.2