Citation:

PANGAEA.874334

Name: Major elements, trace elements and Sr-Nd-Pb isotopes form lavas of lakes Nyos, Wum, Elum and Oku sampled in the Oku Volcanic Group of the Cameroon Volcanic Line
Published: 2017-04-06
License: https://creativecommons.org/licenses/by/3.0/

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Published: 2017-04-06 • DOI registered: 2017-06-05

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Abstract:

Lake Nyos is located at the summit of a stratovolcano in the Oku Volcanic Group (OVG) along the Cameroon Volcanic Line. The sudden release of magmatic CO2 trapped at the bottom of Lake Nyos in August 1986 caused historical casualties of 1750 people and over 3000 cattle. New geochemical data of volcanic rocks from the Nyos volcano and the first available data for volcanic rocks from other maar-bearing volcanoes (Lakes Elum, Wum and Oku) in the OVG are presented and compared. Lavas from the Nyos, Elum and Wum volcanoes show similarities in major and trace elements and Sr?Nd?Pb isotopes, suggestive of a similar mantle source. However, this source is slightly different from that of the Oku volcano. The samples from Lake Oku have lower alkali, higher TiO2 and more depletion and enrichment in most incompatible trace elements than those from the Nyos, Elum and Wum volcanoes. These differences and those observed in the Sr?Nd?Pb results are consistent with a heterogeneous source for lavas in the OVG. Trace element compositions suggested the presence of garnet in the source (< 6% garnet) and modelled melting results indicate < 2% partial melting of the source material. Isotope data plot within the focal zone, extending towards enriched mantle 1 (EM1; e.g. Lakes Oku and Nyos samples). This indicates the involvement of at least three mantle components: depleted mid-ocean ridge basalt mantle, high-µ and EM1 components in the magmatism of the lavas studied. The contributions of these components in different proportions, originating from asthenospheric and subcontinental lithospheric mantle sources, can account for the observed variations in geochemical characteristics. The geochemical characteristics of the studied lavas indicate that the magma source need not necessarily have an abnormal CO2 concentration to pose a potential threat. Degassing of an ordinary magma chamber and the migration of gas to the bottom of the lakes through cracks and faults can lead to the accumulation of CO2 in lake bottoms. This is controlled by tectonic parameters (fractures and faults) that enhance degassing from the magma chamber to the lake bottom and physical parameters of the lake (e.g. size, depth, temperature and solubility) that control CO2 stability.

Related to:

Asaah, Asobo N E; Yokoyama, Tetsuya; Aka, Festus T; Usui, Tomohiro; Kuritani, Takeshi; Wirmvem, Mengnjo J; Iwamori, Hikaru; Fozing, Eric M; Tamen, Jules; Mofor, Gilbert Z; Ohba, Takeshi; Tanyileke, Gregory; Hell, Joseph Victor (2015): Geochemistry of lavas from maar-bearing volcanoes in the Oku Volcanic Group of the Cameroon Volcanic Line. Chemical Geology, 406, 55-69, https://doi.org/10.1016/j.chemgeo.2015.03.030

Coverage:

Median Latitude: 6.345606 * Median Longitude: 10.322673 * South-bound Latitude: 6.192778 * West-bound Longitude: 10.206900 * North-bound Latitude: 6.445050 * East-bound Longitude: 10.453889

Event(s):

OVG_Lake_Elum * Latitude: 6.333333 * Longitude: 10.333333 * Location: Cameroon * Method/Device: Sampling by hand (HAND) * Comment: Position is estimated from map.

OVG_Lake_Nyos * Latitude: 6.445050 * Longitude: 10.296570 * Location: Cameroon * Method/Device: Sampling by hand (HAND) * Comment: Position is estimated from map.

OVG_Lake_Oku * Latitude: 6.192778 * Longitude: 10.453889 * Location: Cameroon * Method/Device: Sampling by hand (HAND) * Comment: Position is estimated from map.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator
1	Event label	Event		Asaah, Asobo N E
2	Latitude of event	Latitude		Asaah, Asobo N E
3	Longitude of event	Longitude		Asaah, Asobo N E
4	Sample ID	Sample ID		Asaah, Asobo N E
5	Silicon dioxide	SiO2	%	Asaah, Asobo N E
6	Titanium dioxide	TiO2	%	Asaah, Asobo N E
7	Aluminium oxide	Al2O3	%	Asaah, Asobo N E
8	Iron oxide, Fe2O3	Fe2O3	%	Asaah, Asobo N E
9	Manganese oxide	MnO	%	Asaah, Asobo N E
10	Magnesium oxide	MgO	%	Asaah, Asobo N E
11	Calcium oxide	CaO	%	Asaah, Asobo N E
12	Sodium oxide	Na2O	%	Asaah, Asobo N E
13	Potassium oxide	K2O	%	Asaah, Asobo N E
14	Phosphorus pentoxide	P2O5	%	Asaah, Asobo N E
15	Loss on ignition	LOI	%	Asaah, Asobo N E
16	Total	Total	%	Asaah, Asobo N E
17	Magnesium	Mg	%	Asaah, Asobo N E
18	Chromium	Cr	mg/kg	Asaah, Asobo N E
19	Nickel	Ni	mg/kg	Asaah, Asobo N E
20	Cobalt	Co	mg/kg	Asaah, Asobo N E
21	Vanadium	V	mg/kg	Asaah, Asobo N E
22	Zinc	Zn	mg/kg	Asaah, Asobo N E
23	Copper	Cu	mg/kg	Asaah, Asobo N E
24	Rubidium	Rb	mg/kg	Asaah, Asobo N E
25	Strontium	Sr	mg/kg	Asaah, Asobo N E
26	Yttrium	Y	mg/kg	Asaah, Asobo N E
27	Zirconium	Zr	mg/kg	Asaah, Asobo N E
28	Niobium	Nb	mg/kg	Asaah, Asobo N E
29	Caesium	Cs	mg/kg	Asaah, Asobo N E
30	Barium	Ba	mg/kg	Asaah, Asobo N E
31	Lanthanum	La	mg/kg	Asaah, Asobo N E
32	Cerium	Ce	mg/kg	Asaah, Asobo N E
33	Praseodymium	Pr	mg/kg	Asaah, Asobo N E
34	Neodymium	Nd	mg/kg	Asaah, Asobo N E
35	Samarium	Sm	mg/kg	Asaah, Asobo N E
36	Europium	Eu	mg/kg	Asaah, Asobo N E
37	Gadolinium	Gd	mg/kg	Asaah, Asobo N E
38	Terbium	Tb	mg/kg	Asaah, Asobo N E
39	Dysprosium	Dy	mg/kg	Asaah, Asobo N E
40	Holmium	Ho	mg/kg	Asaah, Asobo N E
41	Erbium	Er	mg/kg	Asaah, Asobo N E
42	Thulium	Tm	mg/kg	Asaah, Asobo N E
43	Ytterbium	Yb	mg/kg	Asaah, Asobo N E
44	Lutetium	Lu	mg/kg	Asaah, Asobo N E
45	Hafnium	Hf	mg/kg	Asaah, Asobo N E
46	Tantalum	Ta	mg/kg	Asaah, Asobo N E
47	Lead	Pb	mg/kg	Asaah, Asobo N E
48	Thorium	Th	mg/kg	Asaah, Asobo N E
49	Uranium	U	mg/kg	Asaah, Asobo N E
50	Europium	Eu	mg/kg	Asaah, Asobo N E
51	Strontium-87/Strontium-86 ratio	87Sr/86Sr		Asaah, Asobo N E
52	Neodymium-143/Neodymium-144 ratio	143Nd/144Nd		Asaah, Asobo N E
53	Lead-206/Lead-204 ratio	206Pb/204Pb		Asaah, Asobo N E
54	Lead-207/Lead-204 ratio	207Pb/204Pb		Asaah, Asobo N E
55	Lead-208/Lead-204 ratio	208Pb/204Pb		Asaah, Asobo N E

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

1768 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Event	2 Latitude	3 Longitude	4 Sample ID	5 SiO2 [%]	6 TiO2 [%]	7 Al2O3 [%]	8 Fe2O3 [%]	9 MnO [%]	10 MgO [%]	11 CaO [%]	12 Na2O [%]	13 K2O [%]	14 P2O5 [%]	15 LOI [%]	16 Total [%]	17 Mg [%]	18 Cr [mg/kg]	19 Ni [mg/kg]	20 Co [mg/kg]	21 V [mg/kg]	22 Zn [mg/kg]	23 Cu [mg/kg]	24 Rb [mg/kg]	25 Sr [mg/kg]	26 Y [mg/kg]	27 Zr [mg/kg]	28 Nb [mg/kg]	29 Cs [mg/kg]	30 Ba [mg/kg]	31 La [mg/kg]	32 Ce [mg/kg]	33 Pr [mg/kg]	34 Nd [mg/kg]	35 Sm [mg/kg]	36 Eu [mg/kg]	37 Gd [mg/kg]	38 Tb [mg/kg]	39 Dy [mg/kg]	40 Ho [mg/kg]	41 Er [mg/kg]	42 Tm [mg/kg]	43 Yb [mg/kg]	44 Lu [mg/kg]	45 Hf [mg/kg]	46 Ta [mg/kg]	47 Pb [mg/kg]	48 Th [mg/kg]	49 U [mg/kg]	50 Eu [mg/kg]	51 87Sr/86Sr	52 143Nd/144Nd	53 206Pb/204Pb	54 207Pb/204Pb	55 208Pb/204Pb
OVG_Lake_Nyos	6.4450	10.2966	OVG20	46.61	2.79	15.06	12.26	0.18	7.33	8.01	3.96	1.98	0.87	0.24	99.29	0.57	163.47	128.01	42.67	166.23	26.26	112.95	39.59	954.51	25.09	286.25	62.99	0.44	645.25	47.72	88.34	11.38	47.41	9.07	3.01	9.47	1.16	6.05	1.06	2.77	0.35	2.13	0.30	6.35	3.43	2.97	5.32	1.45	1.00	0.70323	0.51292	19.57348	15.62717	39.29167
OVG_Lake_Nyos	6.4450	10.2966	OVG24	46.64	2.97	15.15	12.48	0.18	7.61	8.41	4.26	1.93	0.80	-0.15	100.27	0.58	165.66	131.85	45.17	187.09	33.65	107.34	41.91	969.00	25.19	276.89	60.04	0.31	623.71	44.79	86.61	10.70	44.77	8.57	2.84	9.00	1.11	5.71	1.00	2.61	0.33	2.00	0.29	6.18	3.41	3.05	5.30	1.41	0.99
OVG_Lake_Nyos	6.4450	10.2966	OVG32	45.84	2.80	14.94	12.03	0.18	8.27	9.18	3.84	1.79	0.70	0.14	99.71	0.61	202.42	207.83	44.00	194.34	45.59	101.66	42.21	887.40	23.75	275.80	63.92	0.48	586.47	45.39	84.36	10.62	43.73	8.36	2.73	8.79	1.08	5.64	1.00	2.63	0.33	2.04	0.29	5.96	3.46	3.03	5.60	1.42	0.98	0.70322	0.51292	19.61298	15.62846	39.38739
OVG_Lake_Nyos	6.4450	10.2966	OVG34	47.23	2.73	14.94	12.40	0.18	7.75	8.24	3.97	1.80	0.82	0.04	100.12	0.58	188.41	143.69	39.68	159.15	29.37	110.18	38.13	941.25	24.20	275.65	58.47	0.54	631.58	44.61	84.13	10.79	45.29	8.75	2.93	9.17	1.13	5.84	1.03	2.67	0.33	2.05	0.29	6.26	3.18	3.33	5.07	1.37	1.00
OVG_Lake_Nyos	6.4450	10.2966	OVG35	46.92	2.74	15.00	12.36	0.18	7.42	8.13	4.38	1.95	0.84	1.02	100.93	0.57	187.48	128.37	42.79	161.04	27.33	109.96	39.99	957.41	24.62	286.24	61.18	0.49	636.33	46.03	86.03	10.98	45.97	8.77	2.92	9.14	1.13	5.82	1.02	2.66	0.33	2.02	0.29	7.48	4.03	2.76	5.04	1.36	1.00
OVG_Lake_Nyos	6.4450	10.2966	OVG36	46.45	2.88	15.05	12.36	0.18	7.47	8.37	4.20	1.93	0.80	-0.11	99.58	0.58	159.57	121.26	42.01	172.20	33.98	108.74	43.48	997.81	25.64	282.65	61.34	0.08	643.76	46.04	89.58	10.89	45.38	8.70	2.88	9.11	1.12	5.77	1.01	2.62	0.33	2.03	0.29	5.87	3.46	3.07	5.52	1.46	0.99
OVG_Lake_Nyos	6.4450	10.2966	OVG37	46.31	2.69	15.40	12.48	0.20	6.95	8.27	4.65	2.17	0.94	-0.15	99.91	0.56	137.23	104.82	40.20	168.24	32.42	121.50	59.63	1155.02	28.74	355.05	90.29	0.01	791.99	65.91	121.66	14.04	55.26	9.83	3.16	10.38	1.24	6.28	1.11	2.95	0.37	2.34	0.34	6.77	5.01	4.22	8.76	2.03	0.96	0.70316	0.51291
OVG_Lake_Nyos	6.4450	10.2966	OVG38	46.19	2.72	15.37	12.51	0.20	6.98	8.35	4.86	2.08	0.98	-0.06	100.17	0.56	137.51	102.32	37.94	168.13	27.66	118.77	68.87	1101.78	27.93	350.77	90.32	0.70	802.01	63.67	118.55	14.32	56.72	10.12	3.27	10.72	1.28	6.56	1.17	3.10	0.39	2.41	0.35	6.62	4.13	4.22	8.75	2.19	0.96	0.70318	0.51291	19.70971	15.63513	39.35618
OVG_Lake_Nyos	6.4450	10.2966	OVG39	46.27	2.68	15.44	12.46	0.20	6.95	8.27	4.59	2.14	0.96	0.09	100.03	0.56	142.31	103.95	39.23	167.00	27.81	119.72	60.53	1162.56	28.80	358.95	90.39	0.70	786.37	65.97	121.57	13.99	55.11	9.72	3.13	10.25	1.22	6.24	1.10	2.94	0.37	2.33	0.34	7.52	4.91	4.28	8.78	2.12	0.96
OVG_Lake_Nyos	6.4450	10.2966	OVG40	46.05	2.90	14.96	12.14	0.17	7.36	8.43	4.07	2.00	0.80	-0.08	98.81	0.58	167.06	126.40	44.80	182.00	52.91	108.79	39.73	968.66	24.67	274.23	59.39	0.39	648.76	45.92	86.46	10.99	45.89	8.80	2.93	9.27	1.14	5.88	1.04	2.69	0.33	2.06	0.29	5.49	3.10	3.04	5.31	1.32	1.00	0.70333	0.51288	19.33706	15.59966	39.07950
OVG_Lake_Nyos	6.4450	10.2966	OVG214b	46.39	2.70	14.87	12.14	0.18	7.48	8.35	3.67	1.99	0.84	1.12	99.72	0.58	165.67	127.93	39.56	161.92	29.78	109.13	33.56	962.75	23.97	276.55	58.62	0.45	601.67	42.59	80.45	10.42	43.65	8.37	2.78	8.75	1.08	5.61	0.99	2.55	0.32	1.96	0.28	6.28	3.26	2.75	4.92	1.20	1.00			19.52730	15.59783	39.18739
OVG_Lake_Nyos	6.4450	10.2966	OVG215	47.02	2.71	14.91	12.21	0.18	7.68	8.07	4.22	1.83	0.82	0.23	99.88	0.59	187.47	138.73	43.77	164.77	30.23	109.38	39.97	923.98	23.63	273.57	57.29	0.40	599.62	42.04	79.58	10.24	43.05	8.32	2.75	8.65	1.07	5.57	0.98	2.53	0.32	1.94	0.28	6.17	3.19	2.60	4.88	1.32	0.99	0.70327		19.37789	15.59773	39.11892
OVG_Lake_Nyos	6.4450	10.2966	OVG216	46.94	2.90	15.01	12.10	0.17	7.46	8.13	4.04	1.90	0.78	0.57	100.00	0.58	165.19	128.87	42.67	175.68	33.98	104.98	45.21	900.83	23.32	271.87	57.48	0.59	600.47	43.19	80.75	10.34	43.27	8.31	2.70	8.53	1.06	5.53	0.97	2.49	0.31	1.92	0.27	6.09	3.22	3.52	5.42	1.41	0.98	0.70345	0.51287	18.98171	15.58651	39.09493
OVG_Lake_Elum	6.3333	10.3333	OVG2	44.94	3.09	14.20	12.82	0.18	7.94	9.39	3.72	1.76	0.80	0.06	98.91	0.58	171.34	132.04	47.02	207.12	53.45	110.80	43.18	811.97	24.13	247.15	58.03	0.64	560.41	41.25	77.12	10.11	42.85	8.51	2.81	8.96	1.13	5.93	1.05	2.71	0.33	2.07	0.29	5.36	3.34	2.92	4.92	1.31	0.99	0.70338	0.51288	19.62615	15.65345	39.45134
OVG_Lake_Elum	6.3333	10.3333	OVG4	44.56	2.98	14.20	12.73	0.18	8.73	9.01	3.77	1.87	0.90	-0.05	98.89	0.61	240.43	187.93	50.40	202.76	45.84	115.42	43.66	962.12	24.63	283.63	70.75	0.64	661.88	50.87	92.53	11.86	49.18	9.34	3.06	9.72	1.19	6.06	1.06	2.76	0.34	2.07	0.29	5.61	3.96	3.09	6.15	1.64	0.98	0.70323	0.51291	19.74306	15.64188	39.35541
OVG_Lake_Elum	6.3333	10.3333	OVG5	44.95	2.97	14.22	12.93	0.19	8.92	8.93	4.00	2.00	0.88	0.13	100.12	0.61	249.53	185.21	48.11	198.96	34.76	115.69	47.46	937.94	24.65	288.99	72.16	0.65	664.96	52.38	94.75	12.11	50.42	9.54	3.13	10.01	1.22	6.26	1.10	2.83	0.35	2.16	0.31	5.82	3.92	3.25	6.58	1.81	0.98
OVG_Lake_Elum	6.3333	10.3333	OVG6	44.17	3.31	14.17	13.73	0.19	8.82	9.27	3.88	1.88	0.88	-0.64	99.66	0.59	216.88	150.46	51.59	217.17	34.24	115.57	37.69	903.49	25.52	266.38	65.53	0.56	586.08	47.82	87.95	11.37	47.99	9.26	3.10	9.80	1.21	6.24	1.10	2.84	0.35	2.14	0.30	5.30	3.63	2.40	5.33	1.40	1.00	0.70322	0.51291	19.80974	15.64565	39.46112
OVG_Lake_Elum	6.3333	10.3333	OVG9	44.80	2.97	14.17	12.96	0.19	9.08	9.03	3.46	1.74	0.87	0.21	99.48	0.61	271.54	195.30	49.61	197.86	35.65	114.58	41.10	954.04	24.47	283.60	70.53	0.59	656.57	51.45	93.48	11.91	49.48	9.43	3.09	9.93	1.21	6.18	1.08	2.78	0.34	2.11	0.30	5.36	3.94	3.18	6.47	1.76	0.98
OVG_Lake_Elum	6.3333	10.3333	OVG10	44.70	2.83	14.12	12.89	0.19	9.63	8.52	3.15	1.67	0.88	0.64	99.21	0.63	337.83	254.72	48.40	173.42	37.52	117.44	34.92	991.54	24.75	295.82	73.47	0.67	632.14	50.94	95.27	11.65	47.90	8.99	2.93	9.38	1.14	5.83	1.02	2.66	0.33	2.05	0.29	6.22	3.98	2.97	6.12	1.63	0.98
OVG_Lake_Elum	6.3333	10.3333	OVG11	45.34	3.01	14.26	13.05	0.19	9.04	9.14	3.53	1.80	0.88	0.05	100.29	0.61	275.67	191.15	49.68	209.33	36.04	117.68	43.69	1030.65	24.93	286.62	71.48	0.81	641.22	49.58	93.80	11.55	48.07	9.13	3.01	9.52	1.16	5.89	1.02	2.63	0.32	2.01	0.28	5.21	4.07	3.04	5.97	1.61	0.99
OVG_Lake_Wum	6.4113	10.2069	OVG12	46.51	2.74	14.07	12.33	0.18	9.45	8.07	3.56	1.86	0.89	0.27	99.94	0.63	311.05	249.29	45.73	175.07	26.90	105.75	46.32	973.01	24.58	287.41	67.74	1.07	660.88	52.34	95.67	12.07	49.42	9.14	2.93	9.51	1.15	5.91	1.05	2.74	0.34	2.14	0.30	5.60	3.74	4.54	6.96	1.79	0.96	0.70325	0.51290	19.80189	15.65664	39.40556
OVG_Lake_Wum	6.4113	10.2069	OVG13b	42.95	3.31	15.15	13.76	0.19	8.06	8.31	2.06	1.67	0.89	1.49	97.84	0.57	190.22	128.21	49.25	203.35	34.94	116.52	30.02	871.50	27.02	288.86	69.73	0.56	748.10	50.19	95.98	11.85	49.43	9.38	3.07	9.82	1.21	6.21	1.09	2.85	0.36	2.21	0.32	5.82	3.74	3.14	6.14	1.64	0.98	0.70327	0.51291	19.82140	15.66950	39.54619
OVG_Lake_Wum	6.4113	10.2069	OVG213a	45.31	3.23	14.79	13.22	0.19	7.72	9.35	4.08	1.88	0.88	-0.50	100.14	0.57	172.17	111.83	43.07	212.84	53.24	111.60	44.21	959.40	25.64	279.67	65.96	0.81	599.73	46.68	86.78	11.21	46.91	8.95	2.91	9.43	1.16	6.01	1.06	2.76	0.34	2.12	0.30	6.06	3.68	3.13	5.68	1.55	0.97
OVG_Lake_Wum	6.4113	10.2069	OVGLW-1	46.00	2.81	15.05	11.94	0.18	8.35	8.96	4.20	1.98	0.71	-0.10	100.09	0.61	285.26	223.94	46.04	195.67	50.69	101.53	41.75	886.89	23.53	273.13	63.90	0.60	603.08	45.37	92.94	10.87	45.27	8.71	2.85	8.86	1.14	6.09	1.09	2.83	0.36	2.24	0.32	6.14	3.34	3.61	6.91	1.84	0.99
OVG_Lake_Wum	6.4113	10.2069	OVGLW2	46.09	2.89	14.64	12.35	0.17	8.68	8.92	3.83	1.73	0.80	-0.09	100.01	0.61	248.13	193.61	46.94	196.99	50.36	108.18	37.75	899.94	22.78	249.82	61.05	0.39	642.32	44.15	91.08	10.93	46.66	9.11	3.11	9.43	1.20	6.36	1.12	2.87	0.36	2.23	0.32	5.42	3.12	3.28	6.77	1.71	1.03	0.70330	0.51290	19.70184	15.63736	39.38435
OVG_Lake_Oku	6.1928	10.4539	OVG63	42.84	3.70	14.65	14.36	0.20	7.85	8.95	2.72	1.08	1.15	0.99	98.47	0.55	139.04	98.21	48.52	230.52	39.11	123.53	10.10	1187.00	30.92	323.06	79.44	0.24	861.81	60.65	119.49	14.58	60.94	11.54	3.75	11.96	1.44	7.29	1.29	3.31	0.41	2.51	0.35	6.19	4.48	3.56	6.68	1.67	0.98	0.70332	0.51288
OVG_Lake_Oku	6.1928	10.4539	OVG64	43.83	3.55	14.23	13.98	0.20	7.71	8.85	3.89	1.92	1.11	0.04	99.29	0.55	125.02	99.49	48.05	219.67	29.32	120.27	48.57	1118.82	29.74	307.40	75.31	0.28	736.37	57.72	114.11	13.89	58.08	11.01	3.58	11.39	1.38	7.00	1.24	3.20	0.39	2.42	0.35	6.14	4.36	3.39	6.34	1.62	0.98	0.70329	0.51288
OVG_Lake_Oku	6.1928	10.4539	OVG70	45.19	3.94	13.82	12.96	0.17	8.44	9.91	3.10	1.34	0.78	0.23	99.88	0.59	262.90	155.19	48.54	247.10	42.04	109.25	26.84	1100.58	23.32	226.85	52.41	0.09	549.86	41.32	87.18	10.68	45.72	8.95	3.12	9.28	1.12	5.64	0.99	2.50	0.31	1.86	0.26	4.24	2.97	2.19	3.86	1.03	1.05	0.70348	0.51282	19.22915	15.58160	38.84483
OVG_Lake_Oku	6.1928	10.4539	OVG71	46.95	3.23	16.52	13.29	0.18	4.60	7.09	3.61	1.73	0.76	0.89	98.84	0.44	4.61	1.36	36.82	181.97	24.93	118.08	41.93	1073.99	29.73	345.23	63.81	0.25	508.11	50.27	107.39	13.24	55.82	10.71	3.41	10.93	1.35	6.97	1.25	3.27	0.41	2.57	0.37	7.90	3.55	3.00	4.82	1.43	0.97	0.70338	0.51276
OVG_Lake_Oku	6.1928	10.4539	OVG72	46.55	3.72	15.37	12.14	0.17	5.88	9.32	3.46	1.66	0.93	0.32	99.52	0.52	92.39	49.15	37.99	219.84	29.22	111.01	33.53	1315.45	25.11	259.83	54.97	0.17	619.58	42.89	91.60	11.27	48.59	9.50	3.29	9.71	1.18	6.02	1.06	2.72	0.34	2.06	0.29	4.99	3.12	2.48	4.40	1.22	1.05
OVG_Lake_Oku	6.1928	10.4539	OVG79	46.41	3.82	16.31	13.91	0.17	5.32	7.71	3.60	1.41	0.84	0.22	99.71	0.46	4.00	3.20	40.20	204.61	17.97	103.11	27.45	1288.12	24.04	286.24	59.01	0.20	563.38	43.57	87.01	11.26	47.59	9.04	3.06	9.23	1.13	5.80	1.02	2.65	0.32	2.01	0.29	6.24	3.20	2.18	4.46	1.26	1.02	0.70356	0.51285	19.98513	15.66672	39.85042
OVG_Lake_Oku	6.1928	10.4539	OVG80	43.16	3.94	14.74	14.99	0.21	7.83	9.37	2.73	0.78	1.09	0.97	99.79	0.54							3.97	1113.16	31.18			0.67	923.14	58.15	114.47	14.72	61.40	11.54	3.72	11.95	1.45	7.41	1.30	3.39	0.42	2.57	0.37	6.65	4.62	3.70	6.75	1.79	0.97	0.70335	0.51288	19.45000	15.62264	39.24391
OVG_Lake_Oku	6.1928	10.4539	OVG81	45.39	3.32	13.78	12.68	0.17	9.19	9.71	2.74	1.16	0.88	0.25	99.29	0.62	336.74	178.13	48.95	212.16	41.71	107.49	21.99	1146.68	23.06	205.42	49.92	0.22	521.61	39.97	78.99	10.23	43.88	8.57	3.02	8.91	1.10	5.60	0.98	2.52	0.30	1.89	0.27	4.36	2.80	2.07	3.81	1.06	1.06	0.70357	0.51283	19.34944	15.61921	39.01718
OVG_Lake_Oku	6.1928	10.4539	OVG83	43.90	3.92	14.09	13.40	0.19	8.02	10.83	2.97	1.12	0.69	0.68	99.82	0.57	302.25	113.21	49.95	264.55	46.47	101.01	18.64	1034.99	23.07	204.96	43.70	0.22	486.38	32.04	67.61	9.19	41.17	8.58	2.93	8.86	1.12	5.81	1.01	2.57	0.31	1.90	0.27	4.02	2.46	1.55	2.86	0.83	1.03
OVG_Lake_Oku	6.1928	10.4539	OVG84	45.46	3.49	15.28	12.78	0.22	5.56	8.00	3.52	1.67	2.21	0.61	98.82	0.49							28.06	2886.07	31.80			0.27	928.97	74.26	161.21	21.83	93.87	16.21	5.62	15.44	1.71	7.91	1.32	3.37	0.39	2.36	0.33	6.29	3.82	2.50	4.37	1.34	1.09
OVG_Lake_Oku	6.1928	10.4539	OVG85	45.72	3.58	14.94	13.59	0.18	7.34	8.85	3.35	1.50	1.04	0.14	100.23	0.55	144.21	101.25	45.83	201.78	26.70	110.71	31.20	1090.62	24.95	292.85	60.64	0.36	593.65	48.38	95.94	12.32	52.17	9.93	3.56	10.12	1.22	6.12	1.05	2.68	0.32	1.97	0.28	4.98	3.45	2.44	4.82	1.37	1.09	0.70357	0.51282