Origin of the high variability of water mineral content in the bedrock aquifers of Southern Madagascar

Rabemanana, Vero; Violette, Sophie; Marsily, Ghislain de; Robain, Henri; Deffontaines, Benoı̂t; Andrieux, Patrick; Bensimon, M.; Parriaux, A.

doi:10.1016/j.jhydrol.2004.11.025

Cited by 34 publications

(22 citation statements)

References 16 publications

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“…The above rockwater interaction processes liberate base cations (especially Ca, Mg, and Na) and bicarbonate along with concurrent increase in pH (Rabemanana et al 2005). Considering Eq.…”

Section: Leachate As a Source Of Ions In Groundwatersmentioning

confidence: 99%

Evaluating pollution potential of leachate from landfill site, from the Pune metropolitan city and its impact on shallow basaltic aquifers

Kale

Kadam

Kumar

et al. 2009

Environ Monit Assess

128

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Leachate produced by municipal solid waste dumping site near the metropolitan city of Pune, India was examined for its pollution potential and impact on surrounding shallow basaltic aquifers. Twenty-eight physico-chemical parameters during post-and pre-monsoon seasons (Nov 2006 and May 2007) were determined to assess the seasonal variation in the leachate pollution index (LPI) as well as in the groundwater quality. The leachate demonstrated higher LPI value during pre-monsoon, comparable to those at other metropolises outside India. Potentially toxic leachates derived from the dumping site have largely influenced the adjoining basaltic aquifers through two different modes of transport. Despite high contents of heavy metals (Al, Cd, Cr, Cu,

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“…The above rockwater interaction processes liberate base cations (especially Ca, Mg, and Na) and bicarbonate along with concurrent increase in pH (Rabemanana et al 2005). Considering Eq.…”

Section: Leachate As a Source Of Ions In Groundwatersmentioning

confidence: 99%

Evaluating pollution potential of leachate from landfill site, from the Pune metropolitan city and its impact on shallow basaltic aquifers

Kale

Kadam

Kumar

et al. 2009

Environ Monit Assess

128

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“…The increase in the values Na/Ca for wells in discharge area probably suggests (1) cation exchange reactions between water, rock, and clay minerals (Panagopoulos et al 2004) and (2) precipitation of secondary CaCO 3 minerals in unsaturated zone. The solutes involved in this process are derived from rock-water interactions initiated by rainfall recharge (Rabemanana et al 2005). Field observations support this inference, as secondary carbonates are exposed in the dug well sections of both alluvial and weathered basaltic aquifers.…”

Section: Dissolution Of Primary Silicate Mineralsmentioning

confidence: 87%

“…This is probably on account of purging of a rainy season, which discontinues in summer as rainwater recharge ceases. Most groundwater samples in post-monsoon and a few from pre-monsoon in the study area have Mg [ Ca, indicating abundance of olivine + pyroxene in the host rock as its source (Rabemanana et al 2005). The Na shows inconsequential seasonal distinction (Fig.…”

Section: Spatio-temporal Trends In the Geochemistry Of Groundwatermentioning

confidence: 93%

“…The above rock-water interaction processes unshackle base cations (especially Ca, Mg, and Na) and bicarbonate along with concurrent increase in pH (Rabemanana et al 2005). Considering Eq.…”

Section: Dissolution Of Primary Silicate Mineralsmentioning

confidence: 99%

“…Nonetheless, there is scarcely any information reachable exclusive of a few publications (Pawar and Shaikh 1995;Pawar and Nikumbh 1999;Naik et al 2006) on the connection between geochemistry of water and its implications. Though several publications emphasize groundwater movement from recharge to discharge area abetted by range of hydrogeochemical processes (Lakshmanan et al 2003), divergence in geochemistry could also be the result of hydro-geomorphological, hydrogeological, and anthropogenic factors (Drever 1982;Stuyfzand 1999;Rabemanana et al 2005; Van der Weijden and Pacheco 2006;Tarits et al 2006). In spite of all these fascia, recently silicate rocks with more mafic lithologies such as volcanic rocks are being appraised as an imperative new avant-garde on global climate change through consumption of atmospheric CO 2 (West et al 2005).…”

Section: Introductionmentioning

confidence: 99%

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Geochemical Eccentricity of Ground Water Allied to Weathering of Basalts from the Deccan Volcanic Province, India: Insinuation on CO2 Consumption

Pawar

Pawar²,

Kumar

et al. 2008

Aquat Geochem

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Analyses of 72 samples from Upper Panjhara basin in the northern part of Deccan Plateau, India, indicate that geochemical incongruity of groundwater is largely a function of mineral composition of the basaltic lithology. Higher proportion of alkaline earth elements to total cations and HCO 3 [Cl + SO 4 reflect weathering of primary silicates as chief source of ions. Inputs of Cl, SO 4 , and NO 3 are related to rainfall and localized anthropogenic factors. Groundwater from recharge area representing Ca + Mg-HCO 3 type progressively evolves to Ca + Na-HCO 3 and Na-Ca-HCO 3 class along flow direction replicates the role of cation exchange and precipitation processes. While the post-monsoon chemistry is controlled by silicate mineral dissolution + cation exchange reactions, pre-monsoon variability is attributable chiefly to precipitation reactions + anthropogenic factors. Positive correlations between Mg vs HCO 3 and Ca + Mg vs HCO 3 supports selective dissolution of olivine and pyroxene as dominant process in post-monsoon followed by dissolution of plagioclase feldspar and secondary carbonates. The pre-monsoon data however, points toward the dissolution of plagioclase and precipitation of CaCO 3 supported by improved correlation coefficients between Na + Ca vs HCO 3 and negative correlation of Ca vs HCO 3 , respectively. It is proposed that the eccentricity in the composition of groundwater from the Panjhara basin is a function of selective dissolution of olivine [ pyroxene followed by plagioclase feldspar.The data suggest siallitization (L \ R and R k ) as dominant mechanism of chemical weathering of basalts, stimulating monosiallitic (kaolinite) and bisiallitic (montmorillonite) products. The chemical denudation rates for Panjhara basin worked out separately for the ground and surface water component range from 6.98 to 36.65 tons/km 2 /yr, respectively. The values of the CO 2 consumption rates range between 0.18 9 10 6 mol//km 2 /yr (groundwater) and 0.9 9 10 6 mol/km 2 /yr (surface water), which indicates that the groundwater forms a considerable fraction of CO 2 consumption, an inference, that is, not taken into contemplation in most of the studies.

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Long‐term groundwater resource observatory for Southwestern Madagascar

Carrière

Health

Rakotomandrindra

et al. 2021

Hydrological Processes

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Madagascar has one of the highest poverty rates in the world and consequently the long-term monitoring of groundwater resources is not a priority for the authorities. However, groundwater is often the only sustainable resource that has a satisfactory quality to supply the population. This is especially true in the southwest of the country, which is a semi-arid region and a global change hot spot (intense land use and climate changes). In response to the lack of data, the Groundwater Resource

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Origin of the high variability of water mineral content in the bedrock aquifers of Southern Madagascar

Cited by 34 publications

References 16 publications

Evaluating pollution potential of leachate from landfill site, from the Pune metropolitan city and its impact on shallow basaltic aquifers

Evaluating pollution potential of leachate from landfill site, from the Pune metropolitan city and its impact on shallow basaltic aquifers

Geochemical Eccentricity of Ground Water Allied to Weathering of Basalts from the Deccan Volcanic Province, India: Insinuation on CO2 Consumption

Long‐term groundwater resource observatory for Southwestern Madagascar

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