Lake Shala: Water chemistry, mineralogy and geochemistry of sediments in an Ethiopian Rift lake

1975 ◽  
Vol 64 (1) ◽  
pp. 593-609 ◽  
Author(s):  
Albrecht Baumann ◽  
Ulrich Förstner ◽  
Rudolf Rohde
Keyword(s):  
Water Chemistry ◽  
Ethiopian Rift ◽  
Rift Lake ◽  
Lake Shala

scholarly journals AMS-14C Chronology of a Lacustrine Sequence from Lake Langano (Main Ethiopian Rift): Correction and Validation Steps in Relation with Volcanism, Lake Water and Carbon Balances

Radiocarbon ◽  
2002 ◽  
Vol 44 (1) ◽  
pp. 75-92 ◽  
Author(s):  
Elisabeth Gibert ◽  
Yves Travi ◽  
Marc Massault ◽  
Jean-Jacques Tiercelin ◽  
Tesfaye Chernet
Keyword(s):  
Dissolved Inorganic Carbon ◽  
Regional Scale ◽  
Ethiopian Rift ◽  
Lake Basin ◽  
Main Ethiopian Rift ◽  
Tectonically Active ◽  
Half Graben ◽  
Rift Lake ◽  
The 1960S ◽  
Radiocarbon Chronology

Located in the Ziway-Shala Basin of the Main Ethiopian Rift, Lake Langano is part of an asymmetric half-graben, defined by a series of north-northeast-trending faults in the tectonically active zone of the rift. A 15-m deep succession of organic homogeneous muds, silts, bioclastic sands, and pyroclastic layers was cored in 1994. The definition of a certified radiocarbon chronology on these deposits required the indispensable establishment of modern hydrological and geochemical balances. The isotopic contents of the total dissolved inorganic carbon (TDIC) of surface water clearly show the influence of a deep CO2 rising along the main fault crossing the lake basin. The 5.8 pMC disequilibrium existing in 1994 with the atmosphere likely produces the aging of authigenic materials developing at the lake surface. However, with a mean residence time of ~15 years, this apparent 14C aging of Lake Langano water still integrates the 14C produced by the nuclear tests in the 1960s. Reconstructing the natural 14C activity of the lake TDIC allows for the quantification of the deep CO2 influence, and for the correction of AMS-14C datings performed along the core. The correction of the AMS-14C chronology defined on Lake Langano allows for a better understanding of paleohydrological changes at a regional scale for at least the last 12,700 cal BP.

Zeolites in Pleistocene sediments of an Ethiopian Rift lake

1999 ◽  
Vol 150 (1) ◽  
pp. 159-166
Author(s):  
Wolfram Knoth ◽  
Günter Knuth
Keyword(s):  
Ethiopian Rift ◽  
Rift Lake

Formation of water chemistry in the Modonkul river under the action of mine drainage effluent

2020 ◽  
pp. 56-66
Author(s):  
Z. I. Khazheeva ◽  
S. S. Sanzhanova
Keyword(s):  
Water Chemistry ◽  
Mine Drainage ◽  
High Concentration ◽  
Catchment Basin ◽  
Sulfate Anion ◽  
Concentrated Flow ◽  
Sodium Calcium ◽  
Calcium Cation ◽  
Calcium Magnesium ◽  
The Town

The Dzhida ore field in the Zakamensk district of Buryatia features high concentration of mineralization within a small area. The Dzhida deposit is composed of complex ore. The ore field contains commercial-value primary deposits: Pervomai stockwork of molybdenum, Kholtoson tungsten lode and Inkur stockwork of tungsten. The Modonkul river catchment basin lies inside the Dzhida ore field. A real threat to the town of Zakamensk is created by manmade sand-bulk (old) tailings and slurry dump. By now, the concentrated flow of natural and man-made sand enters the low terrace and floodplain of the Modonkul river in the form of a talus train. This study is focused on the influence of the mine drainage effluent and the Inkur tributary on the water chemistry in the Modonkul river. 80 water samples were taken from the surface layer 0-0.5 m thick at five stations. Physicochemical indices of water were measured at the water sampling points, and the water chemistry was analyzed in a laboratory. In the background conditions, cations and anions in the Modonkul water chemistry range in decreasing order as follows: Са2+ > Mg2+ > Na++К+ и HCO - > SO 2- > Cl-. In the zone of mixture of natural and mine process water, the chemistry changes: from hydrocarbonate to sulfate (anion), from calcium-magnesium to sodium-calcium (cation). Downstream the natural chemistry changes to the hydrocabonate-sulfate composition, with prevailing content of calcium in cations. Iron content of water lowers 3-4 times after influx of mine effluents, while the contents of Mn, Zn, Co and Cd grow and then decrease downstream.

Water chemistry data for studies of the biodegradability of dissolved organic matter in peatland catchments at the Marcell Experimental Forest: 2009-2011

2017 ◽  
Author(s):  
Stephen D. Sebestyen ◽  
Meghan M. Funke ◽  
James B. Cotner ◽  
John T. Larson ◽  
Nathan A. Aspelin
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Water Chemistry ◽  
Chemistry Data

Water-chemistry data for selected springs, geysers, and streams in Yellowstone National Park Wyoming, 2001-2002

2005 ◽  
Author(s):  
R. Blaine McCleskey ◽  
James W. Ball ◽  
D. Kirk Nordstrom ◽  
JoAnn M. Holloway ◽  
Howard E. Taylor
Keyword(s):  
Water Chemistry ◽  
Yellowstone National Park ◽  
National Park ◽  
Chemistry Data
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