@article{PAR00008865,
  title = {{C}ontrols on intense silicate weathering in a tropical river, southwestern {I}ndia},
  author = {{G}urumurthy, {G}. {P}. and {B}alakrishna, {K}. and {R}iotte, {J}ean and {B}raun, {J}ean-{J}acques and {A}udry, {S}. and {S}hankar, {H}. {N}. {U}. and {M}anjunatha, {B}. {R}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {S}ilicate {W}eathering {R}ate ({SWR}) and associated {C}arbon dioxide {C}onsumption {R}ate ({CCR}) in tropical silicate terrain is assessed through a study of the major ion chemistry in a small west flowing river of {P}eninsular {I}ndia, the {N}ethravati {R}iver. {T}he specific features of the river basin are high mean annual rainfall and temperature, high runoff and a {P}recambrian basement composed of granitic-gneiss, charnockite and minor metasediments. {T}he water samples (n = 56) were collected from three locations along the {N}ethravati {R}iver and from two of its tributaries over a period of twelve months. {C}hemical {W}eathering {R}ate ({CWR}) for the entire watershed is calculated by applying rainwater correction using river chloride as a tracer. {C}hemical {W}eathering {R}ate in the {N}ethravati watershed is estimated to 44 t.km(-2).y(-1) encompassing a {SWR} of 42 t.km(-2).y(-1) and a maximum carbonate contribution of 2 t.km(-2).y(-1). {T}his {SWR} is among the highest reported for granito-gneissic terrains. {T}he assessed {CCR} is 2.9 . 10(5) mol.km(-2).y(-1). {T}he weathering index ({R}e). calculated from molecular ratios of dissolved cations and silica in the river, suggests an intense silicate weathering leading to kaolinite-gibbsite precipitation in the weathering covers. {T}he intense {SWR} and {CCR} could be due to the combination of high runoff and temperature along with the thickness and nature of the weathering cover. {T}he comparison of silicate weathering fluxes with other watersheds reveals that under similar morpho-climatic settings basalt weathering would be 2.5 times higher than the granite-gneissic rocks.},
  keywords = {{S}ilicate weathering ; {G}ranitic-gneissic terrain ; {T}ropical ; {N}ethravati ; {R}iver ; {CO}2 consumption},
  booktitle = {},
  journal = {{C}hemical {G}eology},
  volume = {300},
  numero = {},
  pages = {61--69},
  ISSN = {0009-2541},
  year = {2012},
  DOI = {10.1016/j.chemgeo.2012.01.016},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00008865},
}