Rate of siderite precipitation in Lake Nyos, Cameroon

2016 ◽  
Vol 437 (1) ◽  
pp. 213-222 ◽  
Author(s):  
Akiko Ozawa ◽  
Akira Ueda ◽  
Wilson Y. Fantong ◽  
Katsuro Anazawa ◽  
Yutaka Yoshida ◽  
...  
Keyword(s):  
Lake Nyos ◽  
Siderite Precipitation

Modeling the Lake Nyos gas disaster

1988 ◽  
Vol 22 (2) ◽  
pp. 417-418 ◽  
Author(s):  
James A. Fay
Keyword(s):  
Gas Disaster ◽  
Lake Nyos

Environmental modifications of Lake Nyos surface water by artificial degassing

2019 ◽  
Vol 152 ◽  
pp. 115-121 ◽  
Author(s):  
Katsuro Anazawa ◽  
Wilson Y. Fantong ◽  
Akira Ueda ◽  
Akiko Ozawa ◽  
Minoru Kusakabe ◽  
...  
Keyword(s):  
Surface Water ◽  
Lake Nyos

Decreasing removal rate of the dissolved CO2 in Lake Nyos, Cameroon, after the installation of additional degassing pipes

2015 ◽  
Vol 437 (1) ◽  
pp. 177-184 ◽  
Author(s):  
T. Ohba ◽  
S. Ooki ◽  
Y. Oginuma ◽  
M. Kusakabe ◽  
Y. Yoshida ◽  
...  
Keyword(s):  
Removal Rate ◽  
Lake Nyos

Gas discharge at Lake Nyos

Nature ◽  
1990 ◽  
Vol 346 (6282) ◽  
pp. 322-323 ◽  
Author(s):  
YUKIHIRO NOJIRI ◽  
MlNORU KUSAKABE ◽  
JUN-ICHI HlRABAYASHI ◽  
HIROAKI SATO ◽  
YUJI SANO ◽  
...  
Keyword(s):  
Gas Discharge ◽  
Lake Nyos

scholarly journals Gas buildup in Lake Nyos, Cameroon: The recharge process and its consequences

1993 ◽  
Vol 8 (3) ◽  
pp. 207-221 ◽  
Author(s):  
W.C. Evans ◽  
G.W. Kling ◽  
M.L. Tuttle ◽  
G. Tanyileke ◽  
L.D. White
Keyword(s):  
Lake Nyos

Pedogenic siderites fossilizing Ediacaran soil microorganisms on the Baltica paleocontinent

Geology ◽  
2019 ◽  
Vol 48 (1) ◽  
pp. 62-66 ◽  
Author(s):  
Maciej J. Bojanowski ◽  
Magdalena Goryl ◽  
Barbara Kremer ◽  
Beata Marciniak-Maliszewska ◽  
Leszek Marynowski ◽  
...  
Keyword(s):  
Vascular Plants ◽  
Soil Microorganisms ◽  
East European Craton ◽  
Three Dimensions ◽  
Tropical Wetlands ◽  
Humid Climate ◽  
East European ◽  
Microbial Life ◽  
Spherical Structures ◽  
Siderite Precipitation

Abstract Ediacaran siderite-bearing sedimentary rocks from the western part of the East European craton exhibit features typical of redoximorphic paleosols, including pedogenic siderite (e.g., sphaerosiderite) with uniform and negative δ18O and highly variable δ13C values. The siderite precipitated in water-logged soils in a hot and humid climate, and represents a rare example of pedogenic siderite formed before the rise of vascular plants. Morphology of soil microorganisms was preserved in three dimensions due to the early siderite precipitation. These are mainly filamentous and tube-like threads, which might belong to cyanobacteria or fungi, and spherical structures resembling green algae. This microbial life fostered development of strongly reducing soils in tropical wetlands on the Baltica paleocontinent. The Ediacaran sediments of the western East European craton, traditionally regarded as marine, are reinterpreted as containing sections affected by freshwater conditions, documenting the presence of microbial life on the Ediacaran land.

scholarly journals Diagenesis of ferriferous phases in the Northampton ironstone in the Cowthick quarry near Corby (England)

1990 ◽  
Vol 127 (2) ◽  
pp. 169-176 ◽  
Author(s):  
A. U. Gehring
Keyword(s):  
Isotopic Composition ◽  
Partial Pressure ◽  
Fresh Water ◽  
Marine Environment ◽  
Final Stage ◽  
Mean Value ◽  
Chemical Data ◽  
Second Stage ◽  
Diagenetic Processes ◽  
Siderite Precipitation

AbstractBerthierine, siderite and pyrite are the major ferriferous phases in the Northampton ironstone (NIS). Mineralogical and chemical data suggest a formation of these phases in a diagenetic marine environment changing from post-oxic to sulphidic conditions. Berthierine was formed first when the Fe2+ activity in the diagenetic system increased. Later, this phase was partially replaced by siderite and/or pyrite. A second stage of the diagenetic development in the NIS with increasing CO2 partial pressure (PCO2 ) is documented by siderite. The isotopic composition (δ18O mean value: –1.7‰PDB; δ13C mean value: –8.6‰PDB) points to siderite precipitation from a marine porewater environment with a microbial CO2 source. The shift from post-oxic to sulphidic conditions is indicated by the occurrence of pyrite and can be considered as a final stage. The diagenetic processes in the marine environment and the formation of the ferriferous phases were stopped by the influx of brackish or fresh water when the Midland Shelf turned estuarine.

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