TY - JOUR
T1 - Soil profiles as indicators of mineral weathering rates and organic interactions for a Pennsylvania diabase
AU - Hausrath, E. M.
AU - Navarre-Sitchler, A. K.
AU - Sak, P. B.
AU - Williams, J. Z.
AU - Brantley, S. L.
N1 - Funding Information:
We thank H. Gong, M. Angelone, J. Moore, J. Catalina, L. Liermann, J. Macalady, B. Peightal, E. Cabret, M. Nyblade, R. Fletcher and B. Thomas for their help. This work was supported by funding from the National Science Foundation Integrative Graduate Education and Research Traineeship grant DGE-9972759 , the Penn State Biogeochemical Research Initiative for Education. E.M.H. is also grateful for support from the National Science Foundation Graduate Research Fellowship Program . S.L.B. acknowledges support from the NSF-funded Center for Environmental Kinetics Analysis under NSF grant NSF-CHE-0431328 as well as funding from the US Department of Energy grant DE-FG02-05ER15675 . PBS acknowledges permission from the National Park Service to sample along the Appalachian Trail Easement.
PY - 2011/11/24
Y1 - 2011/11/24
N2 - Basaltic bedrock dissolves quickly, and its weathering rate is therefore important towards controlling the composition of natural waters, soil formation, and CO2 concentrations in the atmosphere. Despite its importance, however, few reports of basalt or diabase and gabbro weathering rates exist in the literature, and most have been measured in laboratory dissolution experiments or based on watershed studies. Here, using elemental profiles measured through regolith on a Jurassic diabase dike in south-central Pennsylvania, we calculate time-integrated log dissolution rates (molm-2s-1) of the primary minerals plagioclase (-14.9s-1) and augite (-14.8), and of smectite (-17.6), a secondary clay mineral formed in the soil. Characteristic patterns in elemental profiles are consistent with preserved signatures of corestone formation. Elemental and mineral signatures of the soils relative to the parent rock are compared to predictions from citrate-containing basalt column dissolution experiments. Depletion of apatite and of Al, Fe, Mn, Ti, P, Y, Ni, Cr, Sc, V, Ga, Cu, Zn, and La are observed in the upper meter of the profile relative to the parent rock.
AB - Basaltic bedrock dissolves quickly, and its weathering rate is therefore important towards controlling the composition of natural waters, soil formation, and CO2 concentrations in the atmosphere. Despite its importance, however, few reports of basalt or diabase and gabbro weathering rates exist in the literature, and most have been measured in laboratory dissolution experiments or based on watershed studies. Here, using elemental profiles measured through regolith on a Jurassic diabase dike in south-central Pennsylvania, we calculate time-integrated log dissolution rates (molm-2s-1) of the primary minerals plagioclase (-14.9s-1) and augite (-14.8), and of smectite (-17.6), a secondary clay mineral formed in the soil. Characteristic patterns in elemental profiles are consistent with preserved signatures of corestone formation. Elemental and mineral signatures of the soils relative to the parent rock are compared to predictions from citrate-containing basalt column dissolution experiments. Depletion of apatite and of Al, Fe, Mn, Ti, P, Y, Ni, Cr, Sc, V, Ga, Cu, Zn, and La are observed in the upper meter of the profile relative to the parent rock.
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U2 - 10.1016/j.chemgeo.2011.08.014
DO - 10.1016/j.chemgeo.2011.08.014
M3 - Article
AN - SCOPUS:80055076583
SN - 0009-2541
VL - 290
SP - 89
EP - 100
JO - Chemical Geology
JF - Chemical Geology
IS - 3-4
ER -