scholarly journals Amazonian chemical weathering rate derived from stony meteorite finds at Meridiani Planum on Mars

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
Christian Schröder ◽  
Phil A. Bland ◽  
Matthew P. Golombek ◽  
James W. Ashley ◽  
Nicholas H. Warner ◽  
...  
Keyword(s):  
Chemical Weathering ◽  
Weathering Rate ◽  
Meridiani Planum ◽  
Chemical Weathering Rate ◽  
Stony Meteorite

Chemical weathering rate laws and global geochemical cycles

1994 ◽  
Vol 58 (10) ◽  
pp. 2361-2386 ◽  
Author(s):  
Antonio C. Lasaga ◽  
Josep M. Soler ◽  
Jiwchar Ganor ◽  
Timothy E. Burch ◽  
Kathryn L. Nagy
Keyword(s):  
Chemical Weathering ◽  
Weathering Rate ◽  
Geochemical Cycles ◽  
Rate Laws ◽  
Chemical Weathering Rate

scholarly journals The rate of chemical weathering beneath a quiescent, surge-type, polythermal-based glacier, southern Spitsbergen, Svalbard

1997 ◽  
Vol 24 ◽  
pp. 27-31 ◽  
Author(s):  
J. L. Wadham ◽  
A. J. Hodson ◽  
M. Tranter ◽  
J. A. Dowdeswell
Keyword(s):  
Thermal Regime ◽  
Chemical Weathering ◽  
High Arctic ◽  
Direct Link ◽  
Water Fluxes ◽  
Weathering Rate ◽  
Weathering Rates ◽  
Pertinent Data ◽  
Chemical Weathering Rate ◽  
Annual Discharge

Glacierized basins in the high Arctic are believed to be regions of low chemical weathering rates, despite the lack of pertinent data, because it is believed that water does not flow in significant quantities through subglacial drainage systems. We have calculated chemical weathering rates at Finsterwalderbreen, a polythermal, surge-type glacier in Svalbard. Rates of 320 and 150 meq Σ+ m−1 year−1 were measured in 1994 and 1995, respectively. The corresponding water fluxes were 4.1 × 107 and 1.7 × 107 m3. We estimate that we have measured ~72% of the total annual discharge, hence the true annual chemical weathering rates are ~440 and 210 meq Σ+ m−2 year−1, respectively This gives a mean annual chemical weathering rate of 330 meq Σ+ m−2 year−1, which approximates the continental average of 390 meq Σ+ m−2 year−1 and is intermediate between chemical weathering rates measured on cold-based glaciers (~110–160 meq Σ+ m−2 year−1) and temperate glaciers (450–1000 meq Σ+ m−2 year−1). This suggests that there may be a direct link between chemical weathering rates and thermal regime, and that glacierized basins in the high Arctic cannot necessarily be considered as regions of low chemical weathering and CO2 drawdown.

scholarly journals Enhancement of glacial solute fluxes in the proglacial zone of a polythermal glacier

2001 ◽  
Vol 47 (158) ◽  
pp. 378-386 ◽  
Author(s):  
J. L Wadham ◽  
R. J. Cooper ◽  
M. Tranter ◽  
R. Hodgkins
Keyword(s):  
Active Layer ◽  
Chemical Weathering ◽  
High Arctic ◽  
Weathering Rate ◽  
Glacier Terminus ◽  
Solute Fluxes ◽  
Solute Acquisition ◽  
Polythermal Glacier ◽  
Arctic Glacier ◽  
Chemical Weathering Rate

AbstractAnnual proglacial solute fluxes and chemical weathering rates at a polythermal high-Arctic glacier are presented. Bulk meltwater chemistry and discharge were monitored continuously at gauging stations located at the eastern and western margins of the glacier terminus and at “the Outlet”, 2.5 km downstream where meltwaters discharge into the fjord. Fluxes of non-snowpack HCO3−, SO42−, Ca2+ and Mg2+ increase by 30–47% between the glacier terminus and the Outlet, indicating that meltwaters are able to access and chemically weather efflorescent sulphates, carbonates and sulphides in the proglacial zone. Smaller increases in the fluxes of non-snowpack-derived Na+, K+ and Si indicate that proglacial chemical weathering of silicates is less significant. En3hanced solute fluxes in the proglacial zone are mainly due to the chemical weathering of active-layer sediments. The PCO2 of active-layer ground-waters is above atmospheric pressure. This implies that solute acquisition in the active layer involves no drawdown of CO2. The annual proglacial chemical weathering rate in 1999 is calculated to be 2600 meqΣ+ m−2. This exceeds the chemical weathering rate for the glaciated part of the catchment (790 meqΣ+ m−2) by a factor of 3.3. Hence, the proglacial zone at Finster-walderbreen is identified as an area of high geochemical reactivity and a source of CO2.

Hydrogeochemistry of the Genoa River basin, New South Wales - Victoria

1976 ◽  
Vol 27 (1) ◽  
pp. 165 ◽  
Author(s):  
GE Reinson
Keyword(s):  
River Basin ◽  
Surface Waters ◽  
Chemical Weathering ◽  
Drainage Basin ◽  
Quartz Diorite ◽  
Weathering Rate ◽  
Water Types ◽  
Rock Types ◽  
Mixed Cation ◽  
Chemical Weathering Rate

The Genoa River basin is underlain largely by granitoid rocks which are of three types-quartz diorite-granodiorite, adamellite, and granite-adamellite-and to a lesser extent by metasediments and coarse elastics. Two types of surface water are present in the drainage basin, an Na-Cl type and a mixed-cation HCO3-Cl type. The genesis of these two water types isrelated primarily to differences in rate of chemical weathering of the three granitoid rock types. Mixed-cation HCO3,-Cl waters drain quartz diorite-granodiorite and adamellite terrain, but not granite-adamellite terrain, whereas the reverse is the case for the Na-CI waters. The quartz diorite-granodiorite and closely associated adamellite rock suites contain more minerals which are more readily weathered than does the granite-adamellite rock suite. These minerals (calcium plagioclase, biotite and hornblende) supply Ca, Mg, Na, and HCO3 to the waters through rapid dissolution. Where the rate of chemical weathering is high, the surface waters are characterized by a mixture of atmospheric salts and soluble products of weathering (mixed-cation HCO3-Cl type). Where the chemical weathering rate is low, the surface waters are dominated by atmospheric salts (Na-Cl type). The chemical weathering rate of the underlying bedrock remains as the controlling factor in the genesis of the two water types, even during low runoff periods when both the groundwater contribution to stream flow and the rate of evaporation are high.

Chemical weathering rate, denudation rate, and atmospheric and soil CO2 consumption of Paraná flood basalts in São Paulo State, Brazil

Geomorphology ◽  
2015 ◽  
Vol 233 ◽  
pp. 41-51 ◽  
Author(s):  
Fabiano Tomazini da Conceição ◽  
Carolina Mathias dos Santos ◽  
Diego de Souza Sardinha ◽  
Guillermo Rafael Beltran Navarro ◽  
Letícia Hirata Godoy
Keyword(s):  
Chemical Weathering ◽  
Sao Paulo ◽  
Soil Co2 ◽  
Flood Basalts ◽  
Weathering Rate ◽  
Denudation Rate ◽  
Paulo State ◽  
Co2 Consumption ◽  
São Paulo State ◽  
Chemical Weathering Rate

Impacts of river impoundment on the riverine water chemistry composition and their response to chemical weathering rate

2013 ◽  
Vol 7 (3) ◽  
pp. 351-360 ◽  
Author(s):  
Yang Gao ◽  
Baoli Wang ◽  
Xiaolong Liu ◽  
Yuchun Wang ◽  
Jing Zhang ◽  
...  
Keyword(s):  
Water Chemistry ◽  
Chemical Weathering ◽  
Riverine Water ◽  
Weathering Rate ◽  
Chemical Weathering Rate
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