Aka, F. T. et al. (2008) U-series dating of Lake Nyos maar basalts, Cameroon (West Africa): Implications for potential hazards on the Lake Nyos dam, J. Volcanol. Geoth. Res., 176, 212-224, doi: 10.1016/j.jvolgeores.2008.04.009. < 20100403101829780.admin > pub

Map on Earth or stone. Places and analyses are shown.

  • abstract:

    From previously published 14C and K–Ar data, the age of formation of Lake Nyos maar in Cameroon is still in dispute. Lake Nyos exploded in 1986, releasing CO2 that killed 1750 people and over 3000 cattle. Here we report results of the first measurements of major elements, trace elements and U-series disequilibria in ten basanites/trachy-basalts and two olivine tholeiites from Lake Nyos. It is the first time tholeiites are described in Lake Nyos. But for the tholeiites which are in 238U–230Th equilibrium, all the other samples possess238U–230Th disequilibrium with 15 to 28% enrichment of 230Th over238U. The (226Ra/230Th) activity ratios of these samples indicate small (2 to 4%) but significant 226Ra excesses. U–Th systematics and evidence from oxygen isotopes of the basalts and Lake Nyos granitic quartz separates show that the U-series disequilibria in these samples are source-based and not due to crustal contamination or post-eruptive alteration. Enrichment of 230Th is strong prima facie evidence that Lake Nyos is younger than 350 ka. The 230Th–226Ra age of Nyos samples calculated with the (226Ra/230Th) ratio for zero-age Mt. Cameroon samples is 3.7 ± 0.5 ka, although this is a lower limit as the actual age is estimated to be older than 5 ka, based on the measured mean 230Th/238U activity ratio. The general stability of the Lake Nyos pyroclastic dam is a cause for concern, but judging from its230Th–226Ra formation age, we do not think that in the absence of a big rock fall or landslide into the lake, a big earthquake or volcanic eruption close to the lake, collapse of the dam from erosion alone is as imminent and alarming as has been suggested.

  • doi: 10.1016/j.jvolgeores.2008.04.009
  • modified at 2019-07-11
ISEI/main/127/C/6/Cameroon 5000 < 20151008082620-858506 >
20100614090845285.hkitagawa Img 1162 thumb D20 < 20100614090845285.hkitagawa >pub
  • IGSN: IEDRM00JJ
  • place: N6°26′43.0″, E10°17′37.7″ more
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.095
  • description: Cameroon volcanic line, Lake Nyos, dam in the northern part; (Leave Cameroon 10 <20091105090832380.hkitagawa> and enter Cameroon 5000 <20151008082620-858506> on 2015-10-08).
  • modified at 2019-07-11
20100614090845653.hkitagawa Img 1161 thumb D31 < 20100614090845653.hkitagawa >pub
  • IGSN: IEDRM00JK
  • place: N6°26′43.0″, E10°17′37.7″ more
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.26
  • description: Cameroon volcanic line, Lake Nyos, dam in the northern part; (Leave Cameroon 10 <20091105090832380.hkitagawa> and enter Cameroon 5000 <20151008082620-858506> on 2015-10-08).
  • modified at 2019-07-11
20100614090843075.hkitagawa Img 1174 thumb 1982-1 < 20100614090843075.hkitagawa >pub
  • IGSN: IEDRM00CD
  • place: N4°7′0.0″, E9°5′40.0″ more
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.83
  • age (a): 37 (0)
  • description: Cameroon volcanic line, Mt. Cameroon volcano, 1982 eruption, SW of the summit
  • modified at 2019-07-11
ISEI/main/127/C/6/Cameroon 5003 < 20151008082721-904953 >
20100310094405315.ttsujimori Img 1071 thumb BS16 < 20100310094405315.ttsujimori >pub
  • IGSN: IEDRM00JL
  • place: N6°26′19.7″, E10°18′12.6″ more
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.33
  • description: Lake Nyos, southeastern shore of the lake, lava flow of the initial stages of dam formation; (Leave Cameroon 5 <20091105090635781.hkitagawa> and enter Cameroon 5003 <20151008082721-904953> on 2015-10-08).
  • modified at 2019-07-11
20100310094404510.ttsujimori Img 1067 thumb TS8 < 20100310094404510.ttsujimori >pub
  • IGSN: IEDRM00JM
  • place: N6°26′19.7″, E10°18′12.6″ more
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.125
  • description: Lake Nyos, SSE corner of the lake,dam-forming pyroclastic surge deposits; (Leave Cameroon 5 <20091105090635781.hkitagawa> and enter Cameroon 5003 <20151008082721-904953> on 2015-10-08).
  • modified at 2019-07-11
20100310094405423.ttsujimori Img 1072 thumb D27 < 20100310094405423.ttsujimori >pub
  • IGSN: IEDRM00JN
  • place: N6°26′43.0″, E10°17′37.7″ more
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.17
  • description: Cameroon volcanic line, Lake Nyos, dam in the northern part; (Leave Cameroon 5 <20091105090635781.hkitagawa> and enter Cameroon 5003 <20151008082721-904953> on 2015-10-08).
  • modified at 2019-07-11
20100310094404408.ttsujimori Img 1066 thumb MS19AB < 20100310094404408.ttsujimori >pub
  • IGSN: IEDRM00JO
  • place: N6°26′40.6″, E10°18′4.0″ more
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.23
  • description: Lake Nyos, eastern shore of the lake; dam-forming pyroclastic surge deposits; (Leave Cameroon 5 <20091105090635781.hkitagawa> and enter Cameroon 5003 <20151008082721-904953> on 2015-10-08).
  • modified at 2019-06-28
20100310094404751.ttsujimori Img 1064 thumb YF4B < 20100310094404751.ttsujimori >pub
  • IGSN: IEDRM00JP
  • place: N6°27′14.0″, E10°17′56.0″ more
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.555
  • description: Lake Nyos, NNE from the lake, lava flow
  • modified at 2019-07-11
20100310094404283.ttsujimori Img 1062 thumb D21 < 20100310094404283.ttsujimori >pub
  • IGSN: IEDRM00JQ
  • place: N6°26′43.0″, E10°17′37.7″ more
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.135
  • description: Cameroon volcanic line, Lake Nyos, dam in the northern part; (Leave Cameroon 5 <20091105090635781.hkitagawa> and enter Cameroon 5003 <20151008082721-904953> on 2015-10-08).
  • modified at 2019-07-11
20100310094404861.ttsujimori Img 1065 thumb D26 < 20100310094404861.ttsujimori >pub
  • IGSN: IEDRM00JR
  • place: N6°26′43.0″, E10°17′37.7″ more
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.09
  • description: Cameroon volcanic line, Lake Nyos, dam in the northern part; (Leave Cameroon 5 <20091105090635781.hkitagawa> and enter Cameroon 5003 <20151008082721-904953> on 2015-10-08).
  • modified at 2019-07-11
20100310094405204.ttsujimori Img 1070 thumb BS14 < 20100310094405204.ttsujimori >pub
  • IGSN: IEDRM00JS
  • place: N6°26′19.7″, E10°18′12.6″ more
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.445
  • description: Lake Nyos, southeastern shore of the lake, lava flow of the initial stages of dam formation; (Leave Cameroon 5 <20091105090635781.hkitagawa> and enter Cameroon 5003 <20151008082721-904953> on 2015-10-08).
  • modified at 2019-07-11
20100310094404626.ttsujimori Img 1063 thumb YF3 < 20100310094404626.ttsujimori >pub
  • IGSN: IEDRM00JT
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.355
  • description: Lake Nyos, to the northeast of the lake, group of strombolian cones; (Leave Cameroon 5 <20091105090635781.hkitagawa> and enter Cameroon 5003 <20151008082721-904953> on 2015-10-08).
  • modified at 2019-07-11
ISEI/main/127/C/5/Cameroon 5002 < 20151008082702-723905 >
20100614090831322.hkitagawa Img 1233 thumb 1909-2 < 20100614090831322.hkitagawa >pub
  • IGSN: IEDRM00CN
  • place: N4°13′50.0″, E9°15′10.0″ more
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.515
  • age (a): 110 (0)
  • description: Cameroon volcanic line, Mt. Cameroon volcano, 1909 eruption, NE flank of a crater
  • modified at 2019-07-11
20100614092847838.stokeshi Img 1246 thumb 2000-1 < 20100614092847838.stokeshi >pub
  • IGSN: IEDRM00D0
  • place: N4°8′30.0″, E9°9′20.0″ more
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.965
  • age (a): 19 (0)
  • description: Cameroon volcanic line, Mt. Cameroon volcano, 2000 eruption, summit
  • modified at 2019-07-11
ISEI/main/127/C/5/Cameroon 5001 < 20151008082644-089426 >
20100706092547891.hkitagawa Img 1510 thumb CA04 < 20100706092547891.hkitagawa >pub
  • IGSN: IEDRM00CH
  • place: N4°10′60.0″, E9°16′0.0″ more
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 716.29
  • age (a): 60 (0)
  • description: Cameroon volcanic line, Mt. Cameroon volcano, 1959 eruption, ENE flank of a crater
  • modified at 2019-07-11
20100614092848998.stokeshi Img 1255 thumb CA076 < 20100614092848998.stokeshi >pub
  • IGSN: IEDRM00CG
  • place: N4°5′30.0″, E9°4′40.0″ more
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 1.29
  • age (a): 20 (0)
  • description: Cameroon volcanic line, Mt. Cameroon volcano, 1999 eruption, summit and SW flank of a crater
  • modified at 2019-07-11
20100331093158940.amitbasu Img 1015 thumb CA060 < 20100331093158940.amitbasu >pub
  • IGSN: IEDRM00CC
  • place: N4°9′0.0″, E9°1′60.0″ more
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 2.525
  • age (a): 97 (0)
  • description: Cameroon volcanic line, Mt. Cameroon volcano, 1922 eruption, summit and WSW flank of a crater
  • modified at 2019-07-11
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name spots global-id
caption assembly stone
Table 1. CIPW norms and oxygen isotopic composition of Lake Nyos basalts and granite quartz separates pub CIPW norms and O isotope (Aka et al., Table 1) 12
Table 2. Major elements, trace elements and U-Th-Ra data for Lake Nyos and representative Mt.Cameroon lavas pub major-trace-isotope (Aka et al., 2008) 18
manual
  • name
  • Aka, F. T.
  • Yokoyama, T.
  • Kusakabe, M.
  • Nakamura, E.
  • Tanyileke, G.
  • Ateba, B.
  • Ngako, V.
  • Nnange, J.
  • Hell, J.