A mixture model approach to analyzing major element chemistry data of the Changjiang (Yangtze River)

2005 ◽  
Vol 16 (3) ◽  
pp. 305-318 ◽  
Author(s):  
Lin Xue ◽  
James C. Fu ◽  
Feiyue Wang ◽  
Liqun Wang
Keyword(s):  
Mixture Model ◽  
Yangtze River ◽  
Major Element ◽  
Chemistry Data ◽  
Major Element Chemistry ◽  
Element Chemistry ◽  
Mixture Model Approach ◽  
Model Approach

Major element chemistry in the upper Yangtze River: A case study of the Longchuanjiang River

Geomorphology ◽  
2011 ◽  
Vol 129 (1-2) ◽  
pp. 29-42 ◽  
Author(s):  
Siyue Li ◽  
X.X. Lu ◽  
Min He ◽  
Yue Zhou ◽  
Rongta Bei ◽  
...  
Keyword(s):  
Yangtze River ◽  
Major Element ◽  
Major Element Chemistry ◽  
Element Chemistry ◽  
Upper Yangtze River ◽  
The Upper Yangtze River

Major element chemistry of the Changjiang (Yangtze River)

2002 ◽  
Vol 187 (3-4) ◽  
pp. 231-255 ◽  
Author(s):  
Jingsheng Chen ◽  
Feiyue Wang ◽  
Xinghui Xia ◽  
Litian Zhang
Keyword(s):  
Yangtze River ◽  
Major Element ◽  
Major Element Chemistry ◽  
Element Chemistry

Major element chemistry of the geothermal sea-water at Reykjanes and Svartsengi, Iceland

1978 ◽  
Vol 42 (322) ◽  
pp. 209-220 ◽  
Author(s):  
Stefán Arnórsson
Keyword(s):  
Ground Water ◽  
Major Element ◽  
Sea Water ◽  
Geothermal Water ◽  
Ionic Exchange ◽  
Geothermal Waters ◽  
Major Element Chemistry ◽  
Element Chemistry ◽  
Geothermal Fields ◽  
Reykjanes Peninsula

SummaryHigh-temperature geothermal fields in Iceland represent localized anomalies of hot, altered rock in the uppermost part of the crust, which coincide with points of maximum tectonic/magmatic activity. These points correspond to the intersection of oblique fault swarms to the plate boundaries. Geothermal activity under mid-ocean ridges follows probably similar tectonic/magmatic anomalies.Due to high permeability sea-water invades the bed-rock of the Reykjanes Peninsula, Iceland, and is overlain by a variably thick lens of dilute ground water of meteoric origin. The variable degree of salinity of geothermal waters in the Reykjanes Peninsula has resulted from different degree of mixing of fresh ground water with the underlying sea-water-ground-water in the downflow zones around the geothermal fields. At Reykjanes the geothermal water represents heated sea-water without any freshwater mixing. The difference in the composition of sea-water or sea-water/fresh water mixtures and the geothermal waters is due to basalt/water interaction at elevated temperatures. The major-element chemistry of the geothermal water represents an equilibrium composition at the relevant aquifer temperatures. The activities of silica, calcium, sulphate, and carbonate are thus limited by the solubilities of quartz, anhydrite, and calcite. Fluoride activity is thought to be controlled by an ionic exchange reaction where it substitutes for hydroxyl groups in phyllosilicates. The ratios of individual cations and hydrogen ion are governed by ionic exchange equilibria with hydrothermal minerals, probably smectite and chlorite. The equilibrium pH for the Reykjanes and Svartsengi geothermal waters is 5·5 and 5·1 respectively. Sea-water will become somewhat acid upon heating to more than about 300 °C and equilibration with basalt, the acidity increasing with temperature.

Determination of major element chemistry in terrestrial waters from Antarctica by ion chromatography

1996 ◽  
Vol 739 (1-2) ◽  
pp. 257-263 ◽  
Author(s):  
K.A Welch ◽  
W.B Lyons ◽  
E Graham ◽  
K Neumann ◽  
J.M Thomas ◽  
...  
Keyword(s):  
Ion Chromatography ◽  
Major Element ◽  
Major Element Chemistry ◽  
Element Chemistry
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