@article{fdi:010073192, title = {{REY}-{T}h-{U} dynamics in the critical zone : combined influence of reactive bedrock accessory minerals, authigenic phases, and hydrological sorting ({M}ule {H}ole watershed, {S}outh {I}ndia)}, author = {{B}raun, {J}ean-{J}acques and {R}iotte, {J}ean and {B}attacharya, {S}. and {V}iolette, {A}. and {O}liva, {P}. and {P}runier, {J}. and {M}arechal, {J}. {C}. and {R}uiz, {L}aurent and {A}udry, {S}. and {S}ubramanian, {S}.}, editor = {}, language = {{ENG}}, abstract = {{T}he sources of {REY}-{T}h-{U} and long-term mass balance were assessed in the gneissic tropical forested {C}ritical {Z}one {O}bservatory of {M}ule {H}ole, {I}ndia. {T}he study relies on the characterization of the solid compartments (bedrock, soils, streambed and suspended sediments), on batch leaching experiments of the parent gneiss and on extractions of cation-exchangeable and iron-related pools of selected soil samples. {T}he {REY}-{T}h-{U} primary reservoir is controlled by monazite, xenotime, thorite, allanite, bastnesite, titanite, apatite, and, to a lesser extent, by zircon. {T}his accessory mineral assemblage was profoundly modified by episodes of metamorphism and hydrothermal activity. {A}llanite, bastnesite, titanite, and apatite are prone to break down at incipient weathering stage while monazite, xenotime and zircon are resistant minerals. {O}n a long-term basis, {REY} are roughly inert in the immature saprolite and depleted in the soil cover and are strongly redistributed among secondary phases. {LREE} and {HREY} are mainly controlled by poorly crystallized secondary iron oxides and oxyhydroxides, and, to a lesser extent, by secondary phosphates (e.g., rhabdophane). {T}h, inert in the saprolite, is controlled by well-crystallized secondary iron oxides and oxyhydroxides and likely by secondary thorianite ({T}h{O}2). {REY} and {T}h are not easily mobilized during surface processes such as chelation by organic matter and uptake by plants. {REY} and {T}h are, by far, exported as suspended sediments associated with iron oxides. {T}he {U} export by groundwater and suspended sediments dominates over those of streambed sediments and stream.}, keywords = {{U}pper {C}ontinental {C}rust ; chemical weathering ; erosion ; rare earth ; elements ; thorium ; uranium ; hydrologic sorting ; {C}ritical {Z}one ; {INDE} ; {MULE} {HOLE} {BASSIN} {VERSANT}}, booktitle = {}, journal = {{G}eochemistry {G}eophysics {G}eosystems}, volume = {19}, numero = {5}, pages = {1611--1635}, ISSN = {1525-2027}, year = {2018}, DOI = {10.1029/2018gc007453}, URL = {https://www.documentation.ird.fr/hor/fdi:010073192}, }