Controls on intense silicate weathering in a tropical river, southwestern India

Gurumurthy, G P; Balakrishna, Keshava; Riotte, Jean; Braun, Jean‐Jacques; Audry, Stéphane; Shankar, Udaya H.N.; Manjunatha, B.R.

doi:10.1016/j.chemgeo.2012.01.016

Cited by 86 publications

(62 citation statements)

References 33 publications

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“…In addition, Ca 2+ /Mg 2+ ratios nearing unity (*1.0) may also reflect near congruent dissolution of Mg-and Ca-rich minerals (Harmon et al 2009). The molar ratios of MRB and PRB are also comparable with several rivers draining the Western Ghats (Prasad and Ramanathan 2005;Das et al 2005;Gurumurthy et al 2012), e.g., Achankovil (1.37), Netravati (1.40), Bhima (1.26), upstream of Krishna (1.57), and west-flowing rivers in the Deccan traps (1.30).…”

Section: Hydrogeochemical Driversmentioning

confidence: 85%

“…In addition, spatio-temporal patterns of hydrogeochemistry of several small rivers of the southern Western Ghats were reported by many researchers (e.g., Thrivikramaji 1989;Bajpayee and Verma 2001;Thrivikramaji and Joseph 2001;Prasad and Ramanathan 2005;Maya et al 2007;Kannan 2009;Raj and Azeez 2009;Padmalal et al 2012;Gurumurthy et al 2012;Thomas et al 2014). However, the rivers draining the rain shadow regions of the southern Western Ghats (in Kerala) have gone into oblivion as hardly any studies have been carried out in the east flowing rivers of Kerala.…”

Section: Introductionmentioning

confidence: 89%

“…Silicate weathering has a crucial role in determining the chemical composition of river waters of the world, especially in the humid tropics (e.g., Harmon et al 2009;Gurumurthy et al 2012;Thomas et al 2014) as the active orogenic belts and island arcs promote intensive chemical weathering in the humid tropics (Stallard 1988). It is evident from the fact that though the tropical ecosystems cover only 25 % of the Earth's land surface, they are responsible for 38 % of the dissolved ions and 65 % of the dissolved silica (Meybeck 1987).…”

Section: Introductionmentioning

confidence: 99%

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Hydrogeochemical Drivers and Processes Controlling Solute Chemistry of Two Mountain River Basins of Contrasting Climates in the Southern Western Ghats, India

Thomas

Joseph

Thrivikramji

2015

Environmental Management of River Basin Ecosystems

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Water samples were collected from two mountain rivers of contrasting climates, viz., humid, Muthirapuzha River Basin (MRB) and semi-arid, Pambar River Basin (PRB) during monsoon (MON), post-monsoon (POM) and pre-monsoon (PRM) seasons, and were analyzed to understand the spatio-temporal variability as well as the sources and processes controlling hydrogeochemistry. In MRB and PRB, Ca 2+ and Mg 2+ dominate the cations, while Cl − dominates the anions in MRB and HCO 3 − dominates the anions in PRB. PRB shows an elevated level of ionic abundance and higher degree of mineralization, due to multiple factors such as semiaridity, discharge dominated by groundwater, lithological variations and the influences of carbonates and soil evaporites. However, K + , Cl − and H 4 SiO 4 are relatively higher in MRB, implying significance of both anthropogenic activities and intense silicate weathering. The Ca 2+ + Mg 2+ /HCO 3 − ratios in MRB are also relatively larger than PRB, suggesting high intensity of anthropogenic influences in MRB. Downstream variation of hydrogeochemistry implies a general decreasing trend in MRB, which is attributed to dilution due to high discharge, whereas hydrogeochemistry of PRB shows an increasing downstream trend, by which, the significance of semi-arid climate of the downstream tracts of the basin is implied. Both MRB and PRB show temporal variability in hydrogeochemical attributes implying the role of monsoon rainfall determining stream water composition. − (with respect to Na + ) indicates multiple sources for Cl − (i.e., anthropogenic as well as atmospheric). Even though there are significant differences in water types between MRB and PRB, most of the waters of both the basins are considered to be "transitional". Relatively higher pCO 2 in stream waters (compared to atmosphere) is observed and the phenomenon is attributed to the influent nature of the stream discharge (i.e., contributed by groundwater which is significantly enriched in CO 2 ) and the slower rate of re-equilibration (i.e., solubility vs. release of CO 2 ) with atmosphere. Hence, evidently the hydrogeochemical composition of MRB and PRB is jointly controlled by weathering of silicate and carbonate minerals as well as anthropogenic activities and is influenced by climatic seasonality. The spatiotemporal variability of hydrogeochemical attributes of MRB and PRB is mainly due to the variations in climate, lithology, hydrologic pathways and degree of various anthropogenic activities.

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Section: Hydrogeochemical Driversmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Hydrogeochemical Drivers and Processes Controlling Solute Chemistry of Two Mountain River Basins of Contrasting Climates in the Southern Western Ghats, India

Thomas

Joseph

Thrivikramji

2015

Environmental Management of River Basin Ecosystems

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“…Netravati river watershed is composed of about 83% migmatites and granodiorite to tonalitic gneiss, 5% of charnockites, about 6% metasediments and 2% amphibolites (Gurumurthy et al, 2012). The Chikmagalur granodiorite and tonalite (Taylor et al, 1984) and granodiorite from east of Hoskote (Jayananda et al, 2000), form part of the peninsular gneissic basement in southern India.…”

Section: Weathering Indices and Provenancementioning

confidence: 99%

Response of trace metal redox proxies in continental shelf environment: The Eastern Arabian Sea scenario

Acharya

Panigrahi

Gupta

et al. 2015

Continental Shelf Research

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“…Cation sil values for various rivers vary in the order Songhuajiang (1.44 t km À2 a À1 , T = 4-5°C) < Huanghe [2.13 t km À2 a À1 , T = À4 to 14°C, Gaillardet et al, 1999b] Edmond and Palmer, 1996;Moon et al, 2009]. The silicate weathering rate (TDS sil = 2.23 -t km À2 a À1 ) of Songhuajiang Basin is far lower than that of the Nethravati River [42 t km À2 a À1 , Gurumurthy et al, 2012], which is also a monsoon-controlled river basin draining granite areas but with a much higher mean temperature (around 30°C). Fig.…”

Section: Climate (Temperature and Runoff) As A Main Control On Chemicmentioning

confidence: 99%

Chemical weathering under mid- to cool temperate and monsoon-controlled climate: A study on water geochemistry of the Songhuajiang River system, northeast China

Liu

Zhang

et al. 2013

Applied Geochemistry

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Controls on intense silicate weathering in a tropical river, southwestern India

Cited by 86 publications

References 33 publications

Hydrogeochemical Drivers and Processes Controlling Solute Chemistry of Two Mountain River Basins of Contrasting Climates in the Southern Western Ghats, India

Hydrogeochemical Drivers and Processes Controlling Solute Chemistry of Two Mountain River Basins of Contrasting Climates in the Southern Western Ghats, India

Response of trace metal redox proxies in continental shelf environment: The Eastern Arabian Sea scenario

Chemical weathering under mid- to cool temperate and monsoon-controlled climate: A study on water geochemistry of the Songhuajiang River system, northeast China

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