Lithologic and climatologic controls of river chemistry

Bluth, G. J.; Kump, Lee R.

doi:10.1016/0016-7037(94)90015-9

Cited by 510 publications

(372 citation statements)

References 39 publications

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“…This, coupled with the observations that river water temperatures and physical weathering of the two regions are roughly similar, suggests that runoff determines the CWR in these basins. Similar inference on the coupling between CWR and runoff has been reported earlier (Bluth and Kump, 1994).…”

Section: Variability In Cwrs Among Different Deccan Trap Regionssupporting

confidence: 87%

“…day CEF, however, could be lower than that in the past, because of decrease in both chemical weathering over time due to development of soil cover (Bluth and Kump, 1994) and the aerial coverage of Deccan Traps.…”

Section: Chemical Weathering Ratesmentioning

confidence: 84%

“…These include lithology of the drainage basin, runoff, temperature, vegetation, and relief. In terms of lithology, recent works on basaltic provinces suggest that they weather more rapidly relative to granites and gneisses and that their weathering exerts important control on marine geochemical balances and global change (Meybeck, 1986;Bluth and Kump, 1994;AmiotteSuchet and Probst, 1995;Louvat and Allegre, 1997;Dessert et al, 2001;Amiotte-Suchet et al, 2003;Dessert et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Chemical weathering in the Krishna Basin and Western Ghats of the Deccan Traps, India: Rates of basalt weathering and their controls

Das

Krishnaswami

Sarin

et al. 2005

Geochimica et Cosmochimica Acta

181

142

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Section: Variability In Cwrs Among Different Deccan Trap Regionssupporting

confidence: 87%

Section: Chemical Weathering Ratesmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Chemical weathering in the Krishna Basin and Western Ghats of the Deccan Traps, India: Rates of basalt weathering and their controls

Das

Krishnaswami

Sarin

et al. 2005

Geochimica et Cosmochimica Acta

181

142

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“…On Kaua'i, F TAlk = 0.59×10 6 mol/km 2 /yr and on the island of Hawai'i, F TAlk = 0.88×10 6 mol/km 2 /yr, comparable to the value for Hawai'i previously reported by Dessert et al (2003). They noted that CO 2 consumption in Hawaiian surface waters was lower than predicted from correlations with either runoff or temperature applied to other basaltic regions (Bluth and Kump, 1994;Dessert et al, 2003). Consideration of the large SGD flux eliminates the apparent discrepancy between CO 2 consumption rates in Hawai'i and those from other basaltic regions.…”

Section: Dessert Et Al (2003) Investigated Chemical Weathering Fluxesupporting

confidence: 70%

Chemical weathering fluxes from volcanic islands and the importance of groundwater: The Hawaiian example

Schopka

Derry

2012

Earth and Planetary Science Letters

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We investigated the products and rates of chemical weathering on the Hawaiian Islands, sampling streams on Kaua'i and both streams and groundwater wells on the island of Hawai'i. Dissolved silica was used to investigate the flowpaths of water drained into streams. We found that flowpaths exert a major control on the observed chemical weathering rates. A strong link exists between the degree of landscape dissection and flowpaths of water through the landscape, with streams in undissected landscapes receiving water mainly from surface runoff and streams in highly dissected landscapes receiving a considerable fraction of their water from groundwater (springs and/or seepage). Total alkalinity in Hawaiian streams and groundwater is produced exclusively by silicate chemical weathering. We find that fluxes of total alkalinity (often called "CO 2 consumption rate" in the geochemical literature), from the islands are lower than those observed in basaltic regions elsewhere. Groundwater is, overall, the major transport vector for products of chemical weathering from the Hawaiian Islands. On the youngest and largest island, submarine groundwater discharge (SGD) transports more than an order of magnitude more solutes to the ocean than surface water and on the youngest part of the youngest island, SGD is the only link between the terrestrial weathering system and the ocean. These results suggest that groundwater, and particularly SGD, needs to be included in geochemical weathering budgets of volcanic islands.

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“…Empirical relationships relate HCO 3 À and Si yields to runoff intensity for the five different rock classes (Bluth and Kump, 1994). Hence, for each grid cell that gives rise to exoreic runoff, the absolute runoff is converted into a HCO 3 À and Si yield dependant on lithology.…”

Section: Reconstructing Hcomentioning

confidence: 99%

Modelled glacial and non-glacial HCO3−, Si and Ge fluxes since the LGM: little potential for impact on atmospheric CO2 concentrations and a potential proxy of continental chemical erosion, the marine Ge/Si ratio

Jones¹,

Munhoven²,

Tranter³

et al. 2002

Global and Planetary Change

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The runoff and riverine fluxes of HCO 3 À , Si and Ge that arise from chemical erosion in non-glaciated terrain, are modelled at six time steps from the Last Glacial Maximum (LGM) to the present day. The fluxes that arise from the Great Ice Sheets are also modelled. Terrestrial HCO 3 À fluxes decrease during deglaciation, largely because of the reduction in the area of the continental shelves as sea level rises. The HCO 3 À fluxes, and the inferred consumption of atmospheric CO 2 are used as inputs to a carbon cycle model that estimates their impact on atmospheric CO 2 concentrations ( atms CO 2 ). A maximum perturbation of atms CO 2 by f 5.5 ppm is calculated. The impact of solutes from glaciated terrain is small in comparison to those from non-glaciated terrain. Little variation in terrestrial Si and Ge fluxes is calculated ( < 10%). However, the global average riverine Ge/Si ratio may be significantly perturbed if the glacial Ge/Si ratio is high. At present, variations in terrestrial chemical erosion appear to have only a reduced impact on atms CO 2 , and only little influence on the global Si and Ge cycle and marine Ge/Si ratios during deglaciation. D

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Lithologic and climatologic controls of river chemistry

Cited by 510 publications

References 39 publications

Chemical weathering in the Krishna Basin and Western Ghats of the Deccan Traps, India: Rates of basalt weathering and their controls

Chemical weathering in the Krishna Basin and Western Ghats of the Deccan Traps, India: Rates of basalt weathering and their controls

Chemical weathering fluxes from volcanic islands and the importance of groundwater: The Hawaiian example

Modelled glacial and non-glacial HCO3−, Si and Ge fluxes since the LGM: little potential for impact on atmospheric CO2 concentrations and a potential proxy of continental chemical erosion, the marine Ge/Si ratio

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