@article{fdi:010066003,
  title = {{U}se of {S}r isotopes as a tool to decipher the soil weathering processes in a tropical river catchment, southwestern {I}ndia},
  author = {{G}urumurthy, {G}. {P}. and {B}alakrishna, {K}. and {T}ripti, {M}. and {R}iotte, {J}ean and {A}udry, {S}. and {B}raun, {J}ean-{J}acques and {S}hankar, {H}. {N}. {U}.},
  editor = {},
  language = {{ENG}},
  abstract = {{R}iver water composition (major ion and {S}r-87/{S}r-86 ratio) was monitored on a monthly basis over a period of three years from a mountainous river ({N}ethravati {R}iver) of southwestern {I}ndia. {T}he total dissolved solid ({TDS}) concentration is relatively low (46 mg {L}-1) with silica being the dominant contributor. {T}he basin is characterised by lower dissolved {S}r concentration (avg. 150 nmol {L}-1), with radiogenic {S}r-87/{S}r-86 isotopic ratios (avg. 0.72041 at outlet). {T}he composition of {S}r and {S}r-87/{S}r-86 and their correlation with silicate derived cations in the river basin reveal that their dominant source is from the radiogenic silicate rock minerals. {T}heir composition in the stream is controlled by a combination of physical and chemical weathering occurring in the basin. {T}he molar ratio of {S}i{O}2/{C}a and {S}r-87/{S}r-86 isotopic ratio show strong seasonal variation in the river water, i.e., low {S}i{O}2/{C}a ratio with radiogenic isotopes during non-monsoon and higher {S}i{O}2/{C}a with less radiogenic isotopes during monsoon season. {W}hereas, the seasonal variation of {R}b/{S}r ratio in the stream water is not significant suggesting that change in the mineral phase being involved in the weathering reaction could be unlikely for the observed molar {S}i{O}2/{C}a and {S}r-87/{S}r-86 isotope variation in river water. {T}herefore, the shift in the stream water chemical composition could be attributed to contribution of ground water which is in contact with the bedrock (weathering front) during non-monsoon and weathering of secondary soil minerals in the regolith layer during monsoon. {T}he secondary soil mineral weathering leads to limited silicate cation and enhanced silica fluxes in the {N}ethravati river basin.},
  keywords = {{INDE} {SUD} ; {NETHRAVATI} {BASSIN} {VERSANT}},
  booktitle = {},
  journal = {{A}pplied {G}eochemistry},
  volume = {63},
  numero = {},
  pages = {498--506},
  ISSN = {0883-2927},
  year = {2015},
  DOI = {10.1016/j.apgeochem.2015.03.005},
  URL = {https://www.documentation.ird.fr/hor/fdi:010066003},
}