Adilabad - carbonate ore w supergene oxides

Location - India

Age (of portore) - 770 Ma

Original size - 0.3 million tonnes of Mn

References

Gutzmer, J., and Beukes, N.J., 1998, The manganese formation of the Neoproterozoic Penganga Group, India -- revision of an enigma: Economic Geology, v. 93, p. 1091-1102

Bandopadhyay, P.C., 1988, Syndepositional and postdepositional features of the manganese ore deposits of the Proterozoic Penganga Group, Adilabad district, Andhra Pradesh, India: Mineralium Deposita, v. 23, p. 115-122.

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
avg	Mn carb	29.84	1.36	17.07	0.53	15.10	1.47	0.14	bd	0.01	0.11	29.1
144	siliceous ls	0.02	0.27	25.5	0.9	39.4	0.7	0.3	bd	0.01	0.49	31.4
162	siliceous ls	1.07	0.12	18.4	0.8	42.2	0.8	0.29	bd	0.02	0.08	34.6
153	kutnahorite-chert	27.16	0.77	25.8	0.3	14.9	1.8	0.05	bd	0.00	0.08	27.1
158	kutnahorite-chert	28.09	2.64	25.1	1.2	14.2	1.8	0.37	bd	0.03	0.19	26.1
182	rhodochrosite	41.02	0.67	0.3	0.1	16.2	0.8	0.01	bd	0.00	0.06	34
157
159
180
I81A
182
183
1299
1300

155	Todorokite-rich supergene ore	48.7	3.98	12.3	0.70	7.73	0.9	0.27	bd	0.07	0.15	17.6
I56B	Todorokite-rich supergene ore	51.1	3.90	12.3	0.90	6.58	0.9	0.43	bd	0.07	0.16	13.8

Trace elements, ppm
	ppm	ppm	ppm	ppm	ppm	ppm	ppm	ppm	ppm	ppm	ppm	ppm	ppm	ppm	ppm	ppm	ppm	ppm	ppm
	As	Ba	Cd	Co	Cr	Cu	Mo	Nb	Ni	Pb	Rb	Sc	Sr	Th	U	V	Y	Zn	Zr
avg	na	269	na	6	37	12	na	na	8	5	5	na	184	0.13	0.05	30	10	3	5
144		70		2.5	2.5	2.5			2.5	n.a.	11		127	nr	nr	2.5	6	2.5	2.5
162		29.4		6	2.5	2.5			2.5	2.18	10.4		249	0.88	0.163	10	4.93	2.5	7
153		370		8	28	31			2.5	4.91	2.14		154	0.2	0.055	27	7.1	2.5	2.1
158		370		2.5	42	2.5			20	9.38	13.4		249	0.1	0.045	25	13.1	2.5	10.8
182		67.1		8	42	2.5			2.5	1.31	0.5		148	0.1	0.045	39	8.88	2.5	2.1
157
159
180
I81A
182
183
1299
1300

155		50		8	56	2.5			2.5	nr	nr		nr	nr	nr	54	nr	6	nr
I56B		611		10	141	110			70	9.96	19.2		196	1.06	0.093	53	16.4	16	16

blank or nr = not reported; bd = below detection

Rare-earth elements, ppm
Sample	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu
avg	8.4	44.7	2.1	8.1	1.7	0.4	2.0	0.3	2.0	0.4	1.1	0.2	0.8	0.1
144	4.59	7.91	1.07	3.86	0.833	0.165	0.842	0.124	0.738	0.153	0.395	0.059	0.328	0.046
162	7.03	43.2	1.78	6.66	1.43	0.293	1.54	0.257	1.58	0.322	0.89	0.125	0.675	0.096
153	10.3	44.9	2.63	10.5	2.29	0.507	2.66	0.412	2.55	0.522	1.44	0.194	1.05	0.149
158	7.97	45.9	1.97	7.09	1.52	0.363	1.78	0.312	1.85	0.373	1.03	0.146	0.811	0.112
182
157
159
180
I81A
182
183
1299
1300

155
I56B	11.8	51.8	2.97	12.1	2.65	0.577	3.17	0.491	3.11	0.62	1.69	0.23	1.26	0.181

Rare-earth elements, normalized to chondritic values of Taylor & McLennan (1992)
Sample	LaN	CeN	PrN	NdN	SmN	EuN	GdN	TbN	YbN	Ce/Ce*	Eu/Eu*	LaN/YbN	Ce/Ce* @Al=0	Eu/Eu* @Al=0	LaN/YbN @Al=0
avg	23.0	46.7	15.5	11.4	7.6	4.5	6.5	5.6	3.4	2.471	0.635	6.742	2.47	0.63	6.74
144	12.51	8.27	7.81	5.43	3.61	1.897	2.752	2.138	1.323
162	19.16	45.14	12.99	9.37	6.19	3.368	5.033	4.431	2.722
153	28.07	46.92	19.20	14.77	9.91	5.828	8.693	7.103	4.234
158	21.72	47.96	14.38	9.97	6.58	4.172	5.817	5.379	3.270
182
157
159
180
I81A
182
183
1299
1300

155
I56B	32.15	54.13	21.68	17.02	11.47	6.632	10.359	8.466	5.081	2.050	0.608	6.328	2.050	0.608	6.328

Isotopes
Sample	%S ore	δ³⁴S ore, sulfide	%S host	δ³⁴S host, sulfide	δ¹³C pdb	δ¹⁸O pdb	δ¹⁸O smow	Stotal %	Ccarb %	⁸⁷Sr/⁸⁶Sr
avg					-4.44	24.10	-6.60
144
162
153					-4.44	26.12	-4.59
158					-3.96	23.61	-7.10
182
157					-2.00	22.25	-8.46
159					-6.56	21.74	-8.97
180					-3.73	22.63	-8.08
I81A					-5.83	24.44	-6.27
182					-6.86	25.07	-5.64
183					-6.86	24.94	-5.77
1299					-2.16	25.77	-4.94
1300					-2.01	24.51	-6.20

155
I56B