Effect of parent rock lithology and mining-induced erosion on the geochemistry of riverbed sediment and water in New Caledonia

This dataset allows to reproduce the statistical analysis whose results are presented in the article:"Effect of parent rock lithology and mining-induced erosion on the geochemistry of riverbed sediment and water in New Caledonia"

- File "Table_01.csv" : Characteristic features of main study sites. Site: site nameCatchment type (Catch. type): VS, UP, and MP for volcano-sedimentary, unmined peridotite, and mined peridotite catchments, respectively. Main lithological outcrops : Arg: argillite; Gr: granodiorite; Gre: Greywackes; L: laterite; Se: serpentinite; Sil: siltstone; VS: volcano-sedimentary rocksAreal proportions (%) within catchment of : Unc. sed.: naturally eroded and unconnected sediment patches, Con. Sed.: naturally eroded and connected sediment patches, Unc. mining sed.: mining-eroded and unconnected sediment patches, Con. mining sed.: mining-eroded and connected sediment patches, Mining deg. Areas: areas degraded by mining activities. Lat.: latitude in decimal degrees WGS 84 of the siteLong.: longitude in decimal degrees WGS 84 of the sitenm: not measured.

- File "Table_S01.csv" : Geochemical data for riverbed sediment and water collected at the 15 main sites (n =45 samples).Site name ("Station"); sample number ("Sample"); catchment type ("Treatment"); coordinates in decimal degrees WGS 84 ("Latitude" and "Longitude"); 10th, 50th, and 90th percentiles of the sediment’s grain size distribution ("D10", "D50", "D90"); major element concentrations in sediment ("ICPMS_Element_100", % wt), weathering index ("Weathering_index"), organic carbon content of sediment ("Sed_C_100", wt. %); concentrations of Mg2+ and Ca2+ in water ("Mg_mg_L" and "Ca_mg_L", mg/L); specific conductance of water ("Sp_conductance_µS_cm", µS/cm); pH of water ("pH"); water dissolved oxygen ("DO_mg_L", mg/L); water redox potential ("Redox_mV", mV); trace metal concentrations in sediment ("ICPMS_element_µg_g", µg/g); CrVI (total and adsorbed) concentrations in sediment ("CrVI_tot_µg_g" and "CrVIads_µg_g", µg/g); Ni and Cr water concentrations ("Ni_µg_L" and "Cr_µg_L", µg/L) 

- File "Table_S02.csv" : Water specific conductance and mining-induced erosion data at the 48 additional sites.Site code from Mouron et al. 2025 ("Site_Code"); coordinates in decimal degrees WGS 84 ("Latitude" and "Longitude"); catchment area ("Catchment_area", km2); areal proportion of peridotite ("Peridotite_100", %); areal proportion of surfaces degraded by mining activities ("Mining_deg_100", %); specific conductance of water ("Sp_conductance_µS_cm", µS/cm)

- File "Table_S03.xlsx" : Geochemical data used to compute the weathering index.Reference; Sample code; Location in New Caledonia; Latitude (decimal degree); Longitude (decimal degree); Lithology; Geochemical elements (original data); Geochemical elements re-closed to 100 wt.%; Weathering index (W)

- File "R_Script_Mouron_et_al_2026.rmd" : R Markdown document to open in RStudio, containing the script used to reproduce the statistical analysis in R. 

- File "Script uplsope area original.py" : Python file to open in QGIS, containing the script to automatically compute the upstream catchment area of multiple sites (from Savchuk, 2020). 

References : Mouron, Samuel, Yannick Dominique, David Eme, et al. « Catchment Productivity Controls Local Species Richness of Hyporheic Invertebrate Communities in Tropical New Caledonia Streams ». Ecology and Evolution 15, nᵒ 12 (2025): e72798. https://doi.org/10.1002/ece3.72798.

Savchuk, Angelina. « Answer to “Qgis SAGA Upslope Area for several points automation” ». Geographic Information Systems Stack Exchange, 28 January 2020. https://gis.stackexchange.com/a/348816.