Process and rate of dedolomitization: Mass transfer and 14C dating in a regional carbonate aquifer

Back, William; Hanshaw, Bruce B.; Plummer, L. Niel; Rahn, Perry H.; Rightmire, Craig T.; Rubin, Meyer

doi:10.1130/0016-7606(1983)94<1415:parodm>2.0.co;2

Cited by 185 publications

(86 citation statements)

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“…Petrographic analyses of rocks from the Wadi El Ain area (Table 1) are consistent with the modeled dissolution of igneous rocks and formation of clays. Calculated mineral SIs are consistent with dissolution and precipitation of mineral phases in NETPATH models (Table 6) including de-dolomitization driving the dissolution of dolomite despite over-saturated SIs (Back et al 1983). …”

Section: Resultssupporting

confidence: 64%

Geochemical and isotopic evolution of groundwater in the Wadi Watir watershed, Sinai Peninsula, Egypt

et al. 2013

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The Wadi Watir delta in the Wadi Watir watershed is a tourist area in the arid southeastern part of the Sinai Peninsula, Egypt, where development and growth of the community on the delta are constrained by the amount of groundwater that can be withdrawn sustainably. To effectively manage groundwater resources in the Wadi Watir delta, the origin of groundwater recharge, groundwater age, and changes in groundwater chemistry in the watershed needs to be understood. Mineral identification, rock chemistry, water chemistry, and the isotopes of hydrogen, oxygen, and carbon in groundwater were used to identify the sources, mixing, and ages of groundwater in the watershed and the chemical evolution of groundwater as it flows from the upland areas in the watershed to the developed areas at the Wadi Watir delta. Groundwater in the Wadi Watir watershed is primarily from recent recharge while groundwater salinity is controlled by mixing of chemically different waters and dissolution of minerals and salts in the aquifers. The El Shiekh Attia and Wadi El Ain areas in the upper Wadi Watir watershed have different recharge sources, either from recharge from other areas or from different storm events. The downgradient Main Channel area receives groundwater flow primarily from the El Shiekh Attia area. Groundwater in the Main Channel area is the primary source of groundwater supplying the aquifers of the Wadi Watir delta.

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Section: Resultssupporting

confidence: 64%

Geochemical and isotopic evolution of groundwater in the Wadi Watir watershed, Sinai Peninsula, Egypt

et al. 2013

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“…The chemical trends seen in Figures 33 are similar to major-ion evolution sequences (Chevotarev, 1955;Freeze and Cherry, 1979) and to dedolomitization, which is dissolution of dolomite and precipitation of calcite caused by the dissolution of anhydrite (Back and Hanshaw, 1970;Hanshaw and Back, 1979;Back et al, 1983;Busby et al, 1990;Plummer et al, 1990). Therefore, we also chose dissolved sulfate as a reaction-progress variable to examine water chemistry.…”

Section: Future Plansmentioning

confidence: 68%

“…Supersaturation with respect to calcite causes precipitation of the mineral, resulting in a decrease of alkalinity and further dissolution of dolomite and anhydrite. This is a typical mechanism of dedolomitization in carbonate rocks (Back and Hanshaw, 1970;Hanshaw and Back, 1979;Back et al, 1983;Busby et al, 1990;Plummer et al, 1990). (Dickey, 1969).…”

Section: Future Plansmentioning

confidence: 96%

Anisotropy and spatial variation of relative permeability and lithologic character of Tensleep Sandstone reservoirs in the Bighorn and Wind River Basins, Wyoming. Annual report, October 1, 1994-- September 30, 1995

Dunn¹

1996

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“…Dedolomitization driven by anhydrite dissolution, which commonly affects reservoirs containing dolostones associated with gypsum layers (Back et al, 1983;Plummer et al, 1990;Capaccioni et al, 2001;Appelo and Postma, 2005), may also have a significant influence on the chemistry of these thermal waters. The LS waters have Ca 2+ /HCO 3 À (in equivalent units) fixed by stoichiometric dissolution of calcite (Fig.…”

Section: Origin Of Watersmentioning

confidence: 99%

A combined geochemical and isotopic study of the fluids discharged from the Montecatini thermal system (NW Tuscany, Italy)

Capecchiacci

Tassi

Vaselli

et al. 2015

Applied Geochemistry

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a b s t r a c tThe thermo-mineral fluids discharges of Montecatini Terme (Northern Apennines, Tuscany, Italy) have been exploited since the Roman times and despite the fact that this thermal complex is one of the biggest in Europe, the most recent geochemical investigations were published almost 40 years ago. To fill this gap, in this paper a detailed geochemical and isotopic investigation on the main thermal springs and wells from the Montecatini thermal system (MTS) is presented.The chemical and isotopic features of the Montecatini waters suggested that they are mainly controlled by water-rock interaction processes between meteoric water, permeating at depth from the surrounding reliefs (up to 800 m a.s.l.), and the Triassic evaporites (Burano Formation) belonging to the Tuscan sedimentary series. The local stratigraphic and tectonic framework favors an efficient recharge of the hydrothermal reservoir by the meteoric precipitation from a large catchment area and this aspect plays a fundamental role for the longevity of the Montecatini thermal spas, notwithstanding the huge amount of thermal water exploited. The C-TDIC values were lower than those expected for a mantle/thermometamorphic CO 2 source. This can be explained by: (i) isotopic fractionation occurring during calcite precipitation and/or (ii) mixing with biogenically derived gases, occurring at relatively shallow depth.

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Process and rate of dedolomitization: Mass transfer and 14C dating in a regional carbonate aquifer

Cited by 185 publications

References 0 publications

Geochemical and isotopic evolution of groundwater in the Wadi Watir watershed, Sinai Peninsula, Egypt

Geochemical and isotopic evolution of groundwater in the Wadi Watir watershed, Sinai Peninsula, Egypt

Anisotropy and spatial variation of relative permeability and lithologic character of Tensleep Sandstone reservoirs in the Bighorn and Wind River Basins, Wyoming. Annual report, October 1, 1994-- September 30, 1995

A combined geochemical and isotopic study of the fluids discharged from the Montecatini thermal system (NW Tuscany, Italy)

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