000088513 001__ 88513
000088513 005__ 20230111103826.0
000088513 0247_ $$2doi$$a10.1080/15230430.2019.1660125
000088513 0248_ $$2sideral$$a116716
000088513 037__ $$aART-2019-116716
000088513 041__ $$aeng
000088513 100__ $$0(orcid)0000-0003-1463-1682$$aAuqué, L.F.$$uUniversidad de Zaragoza
000088513 245__ $$aChemical weathering in a terminal moraine at the ice sheet margin at Kangerlussuaq, western Greenland
000088513 260__ $$c2019
000088513 5060_ $$aAccess copy available to the general public$$fUnrestricted
000088513 5203_ $$aWeathering caused by interaction between glacial sediments and water in exposed moraines needs to be studied to evaluate their possible effects on the global carbon cycle. In this study, moraine ponds, moraine porewaters, and till samples were collected at a moraine adjacent to the Greenland Ice Sheet at Kangerlussuaq. Scanning electron microscopy (SEM) studies of the till show limited evidence of silicate chemical weathering, but the moraine waters have substantial solute concentrations. d34SSO4 and d18OSO4 data indicate that the origin of dissolved sulfate is the oxidation of sulfides, in agreement with the SEM observations. The dissolved HCO3-/SO42- molar ratios indicate an uneven balance between sulfuric and carbonic acid weathering; C-isotope data indicate that some of the CO2 originates from organic carbon mineralization. Ion–ion plots provide evidence of carbonate weathering and of the formation of secondary gypsum and calcite through evaporation and (or) cryoconcentration. The 87Sr/86Sr ratios in the waters correlate with the corresponding till samples, supporting the local origin of the dissolved strontium, which is higher in the waters than in the till due to the selective weathering of biotite. The data evidence a large degree of chemical weathering in moraines promoted by large rock–water ratios and by the hydraulic isolation created by the frozen till. The high PCO2 in the studied moraine waters indicates that they may represent a previously underestimated CO2 source.
000088513 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttp://creativecommons.org/licenses/by/3.0/es/
000088513 590__ $$a1.784$$b2019
000088513 591__ $$aGEOGRAPHY, PHYSICAL$$b34 / 50 = 0.68$$c2019$$dQ3$$eT3
000088513 591__ $$aENVIRONMENTAL SCIENCES$$b179 / 265 = 0.675$$c2019$$dQ3$$eT3
000088513 592__ $$a0.717$$b2019
000088513 593__ $$aEarth-Surface Processes$$c2019$$dQ2
000088513 593__ $$aGlobal and Planetary Change$$c2019$$dQ2
000088513 593__ $$aEcology, Evolution, Behavior and Systematics$$c2019$$dQ2
000088513 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000088513 700__ $$aPuigdomenech, I.
000088513 700__ $$aTullborg, E-L.
000088513 700__ $$0(orcid)0000-0001-5645-9150$$aGimeno, M.J.$$uUniversidad de Zaragoza
000088513 700__ $$aGrodzinsky, K.
000088513 700__ $$aHogmalm, K.J.
000088513 7102_ $$12000$$2685$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Petrología y Geoquímica
000088513 773__ $$g51, 1 (2019), 440-459$$pArct. antarct. alp. res.$$tARCTIC ANTARCTIC AND ALPINE RESEARCH$$x1523-0430
000088513 8564_ $$s3500958$$uhttps://zaguan.unizar.es/record/88513/files/texto_completo.pdf$$yVersión publicada
000088513 8564_ $$s233702$$uhttps://zaguan.unizar.es/record/88513/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000088513 909CO $$ooai:zaguan.unizar.es:88513$$particulos$$pdriver
000088513 951__ $$a2023-01-11-10:07:30
000088513 980__ $$aARTICLE