Geothermal springs of the West Florida continental shelf: Evidence for dolomitization and radionuclide enrichment

Fanning, Kent A.; Byrne, Robert H.; Breland, Jabe A.; Betzer, Peter R.; Moore, Willard S.; Elsinger, Robert J.; Pyle, Thomas E.

doi:10.1016/0012-821x(81)90188-6

Cited by 96 publications

(41 citation statements)

References 15 publications

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“…Source of 226 Ra and 228 Ra to the Pettaquamscutt estuaryGroundwater contains dissolved material produced from the weathering of rock (Adams and Rhodes 1960;Freeze and Cherry 1979;Fanning et al 1981;Cable et al 1996;Corbett et al 1999;Greeman et al 1999). Several studies have suggested that 228 Ra and 226 Ra have potential as groundwater source tracers since they have identical chemistries but are from different decay series (King et al 1982;Greeman et al 1999;Eikenberg et al 2001;Tricca et al 2001).…”

Section: Discussionmentioning

confidence: 99%

“…Funding for this work was provided by the Rhode Island Sea Grant Program (Project Award R/CL-013) and a United States Geological Survey award to the University of Rhode Island Water Resource Center (Project 03). Elsinger and Moore 1980;Fanning et al 1981;Bollinger and Moore 1993;Hancock and Murray 1996;Moore 1996;Rama and Moore 1996;Moore 1997a,b;Scott 1998;Hussain et al 1999;Krest et al 1999Krest et al , 2000Charette et al 2001;Scott and Moran 2001;Burnett et al 2002). The application of Ra isotopes as tracers of groundwater input to coastal systems is based on balancing the input of 226 Ra from groundwater with the removal of excess 226 Ra due to tidal flushing.…”

Section: Acknowledgmentsmentioning

confidence: 99%

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Seasonal changes in groundwater input to a well‐mixed estuary estimated using radium isotopes and implications for coastal nutrient budgets

Kelly

Moran

2002

Limnology & Oceanography

162

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Abstract226 Ra (half-life 1,600 yr) and 228 Ra (half-life 5.75 yr) were used as tracers to determine seasonal changes in groundwater input to the Pettaquamscutt estuary from June 1999 to June 2000. Ra isotopes were observed to be in excess of activities due to input from streams, Rhode Island Sound water, and particle desorption. The source of excess 226 Ra and 228 Ra within the estuary is attributed to groundwater transport of Ra derived from the weathering of bedrock within the Pettaquamscutt watershed. Short-lived 224 Ra (half-life 3.66 d) was used to calculate an average residence time of the estuary of 8 Ϯ 4 d. Box models used to constrain seasonal changes in groundwater input to the estuary indicate highest groundwater input in the summer (6.4-20 L m Ϫ2 d Ϫ1 ) and lowest values in the winter (2.1-6.9 L m Ϫ2 d Ϫ1 ). These Ra-derived groundwater fluxes are similar to rates of aquifer recharge over the annual cycle. Using these Ra-derived groundwater fluxes, the input of inorganic nitrogen and phosphorus from groundwater to the Pettaquamscutt was estimated at 61-180 mmol m Ϫ2 yr Ϫ1 and 4.4-13 mmol m Ϫ2 yr Ϫ1, respectively.

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Section: Discussionmentioning

confidence: 99%

Section: Acknowledgmentsmentioning

confidence: 99%

Seasonal changes in groundwater input to a well‐mixed estuary estimated using radium isotopes and implications for coastal nutrient budgets

Kelly

Moran

2002

Limnology & Oceanography

162

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“…Even though it varies from place to place, the continental shelves can perhaps be extended to hundreds and/or thousands of kilometers offshore. There are plenty of scientific evidences for the availability of SGD [2][3][4][19][20][21][22][23]. Therefore, it is important to consider the model extent offshore for accurate simulations of the position of saltwater-freshwater interface.…”

Section: Plotting the Two Cases On One Graphmentioning

confidence: 99%

Groundwater Flow Modeling in Coastal Aquifers: The Influence of Submarine Groundwater Discharge on the Position of the Saltwater-Freshwater Interface

Shishaye¹

2016

J Coast Zone Manag

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Journal of Coastal Zone Management AbstractAn investigation of the impact of submarine groundwater discharge on the position of saltwater-freshwater interface is presented in this manuscript. Two conceptualizations were considered and analyzed using both analytic and numerical techniques, for comparison purposes. The first conceptualization assumes that the tip of the saltwaterfreshwater interface occurs at the shoreline, and the second conceptualization allows for the tip to extend off-shore. Analytic solutions exist for both conceptualizations. Results from both analytic and numeric analysis for the two conceptualizations are presented. Results from the first conceptualization were found to overestimate the inland distance to the interface toe, compared to the second conceptualization, for it ignores the influence of submarine groundwater discharge on the interface location. Moreover, results from the analytic solutions as a whole were found to overestimate the interface location compared to the numerical modeling results, for analytic solutions are based on the sharp interface approximations. Therefore, an empirically derived dispersion factor should be used to correct the analytic solution results so as to compare them with the numerically simulated values. Furthermore, offshore model extents should be incorporated when modeling coastal aquifer systems to include the influence of submarine groundwater discharge on the saltwater-freshwater interface position.

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“…usgs.gov/eqcenter/eqinthenews/2006/usslav/). Nevertheless, differential geothermal gradients setting up Kohout-style convection (Tanner, 1976;Fanning et al, 1981;Kohout et al, 1977Kohout et al, , 1988Mitchell-Tapping et al, 1999;Mitchell-Tapping, 2002) mixing ground-waters of different salinities and carbonate saturation states possibly produced selective dissolution of carbonate or evaporite rocks, or both. Much of the high-resolution seismic refl ection profi ling on the Little and northern Great Bahama Bank, and Cay Sal Bank presented here reveals no sub-basins or subsurface deformation in the shallow stratigraphy (Hine & Neumann, 1977;Hine, 1977;Hine et al, 1981;Hine & Steinmetz, 1984).…”

Section: Formation and Fi Lling Of The Tampa Bay And Charlotte Harbormentioning

confidence: 99%

Karst Sub‐Basins and Their Relationship to the Transport of Tertiary Siliciclastic Sediments on the Florida Platform

Hine

Suthard

Locker

et al. 2009

Perspectives in Carbonate Geology

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Multiple, spatially restricted, partly enclosed karst sub-basins with as much as 100 m of relief occur on a mid-carbonate platform setting beneath the modern estuaries of Tampa Bay and Charlotte Harbor located along the west-central Florida coastline. A relatively high-amplitude seismic basement consists of the mostly carbonate, upper Oligocene to middle Miocene Arcadia Formation, which has been signifi cantly deformed into folds, sags, warps and sinkholes. Presumably, this deformation was caused during a mid-to-late Miocene sea-level lowstand by deep-seated dissolution of carbonates, evaporites or both, resulting in collapse of the overlying stratigraphy, thus creating palaeotopographic depressions.Seismic sequences containing prograding clinoforms fi lled approximately 90% of the accommodation space of these western Florida sub-basins. Borehole data indicate that sediment fi ll is mostly siliciclastic deposited within deltaic depositional systems. The sedimentary fi ll in the Tampa Bay and Charlotte Harbor sub-basins is mostly assigned to the upper Peace River Formation of late Miocene to early Pliocene age. This fi ll is part of a >1000 km long, Tertiary siliciclastic deposit that stretches north-to-south down peninsular Florida. Sediment fi ll of these two sub-basins is linked to erosion and remobilization of pre-existing, middle Miocene quartz-rich sediments via enhanced sediment transport by local, short-length rivers and discharge into coastalmarine depositional environments. Increased sediment discharge possibly resulted from amplifi ed thunderstorm activity and enhanced runoff during a warm period of the Pliocene.Rather than incised valley fi lls or reef-margin, backfi lled basins, Tampa Bay and Charlotte Harbor represent spatially restricted, sediment-fi lled karst palaeotopographic lows. The 'dimpling' of a carbonate platform by karst sub-basins provides a previously unrecognized mechanism for the creation of accommodation that can result in the 'drowning' of a carbonate platform by siliciclastics.

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Geothermal springs of the West Florida continental shelf: Evidence for dolomitization and radionuclide enrichment

Cited by 96 publications

References 15 publications

Seasonal changes in groundwater input to a well‐mixed estuary estimated using radium isotopes and implications for coastal nutrient budgets

Seasonal changes in groundwater input to a well‐mixed estuary estimated using radium isotopes and implications for coastal nutrient budgets

Groundwater Flow Modeling in Coastal Aquifers: The Influence of Submarine Groundwater Discharge on the Position of the Saltwater-Freshwater Interface

Karst Sub‐Basins and Their Relationship to the Transport of Tertiary Siliciclastic Sediments on the Florida Platform

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