TY - Generic T1 - A cost-effective technique for reconnaissance evaluation of aquifers T2 - Proceedings of the National Symposium on Aquifer Restoration and Ground-Water Monitoring Y1 - 1983 A1 - Heeley, Richard W. A1 - Stephen B Mabee KW - #StaffPubs KW - aquifers KW - case studies KW - economics KW - evaluation KW - Groton KW - ground water KW - hydrogeology KW - Hydrogeology 21 KW - Mashpee KW - massachusetts KW - methods KW - monitoring wells KW - Newton KW - pollution KW - pump tests KW - specific capacity KW - surveys KW - transmissivity KW - United States KW - waste disposal KW - water resources KW - water supply KW - water wells KW - wells KW - Westford JF - Proceedings of the National Symposium on Aquifer Restoration and Ground-Water Monitoring PB - National Water Well Association : Worthington, OH, United States CY - United States VL - 3 SN - 07499515 UR - https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&cad=rja&uact=8&ved=0CDgQFjAD&url=http%3A%2F%2Fuwyo.coalliance.org%2Fislandora%2Fobject%2Fwyu%253A10425%2Fdatastream%2FOBJ%2Fdownload%2FProceedings_Of_The_Third_National_Symposium_On_Aquifer_R N1 - Accession Number: 1984-022767; Conference Name: Third national symposium on aquifer restoration and ground-water monitoring; Columbus, OH, United States; Conference Date: 19830525; Language: English; Collation: 7; Collation: 213-219; Publication Types: Serial; Conference document; Updated Code: 1984; Illustration(s): illus. incl. 3 tables, sketch maps; Number of References: 3; Monograph Title: Proceedings of the Third national symposium on aquifer restoration and ground-water monitoring; Monograph Author(s): Nielsen, David M. [editor]; Reviewed Item: Analytic JO - Proceedings of the National Symposium on Aquifer Restoration and Ground-Water Monitoring ER - TY - Generic T1 - Evidence for arsenic-mineralization in granitic basement rocks, Ayer Granodiorite, northeastern Massachusetts T2 - Abstracts with Programs - Geological Society of America Y1 - 2010 A1 - Koteas, G. Christopher A1 - Keskula, Anna J. A1 - Stein, Carol L. A1 - McTigue, David F. A1 - Joseph P Kopera A1 - Brandon, William C. KW - #StaffPubs KW - acadian KW - arsenic KW - arsenides KW - arsenopyrite KW - Ayer Granodiorite KW - Berwick formation KW - fractured materials KW - geochemistry KW - granodiorites KW - Igneous and metamorphic petrology 05A KW - igneous rocks KW - lower Paleozoic KW - massachusetts KW - Merrimack Synclinorium KW - metals KW - metamorphic rocks KW - metamorphism KW - metasedimentary rocks KW - metasomatism KW - Middlesex County Massachusetts KW - migration of elements KW - mineralization KW - Mineralogy of non-silicates 01C KW - northeastern Massachusetts KW - orogeny KW - Paleozoic KW - plutonic rocks KW - pollutants KW - pollution KW - pyrite KW - sulfides KW - United States AB - Core samples of the Ayer Granodiorite along the eastern margin of the Merrimack Belt in northeastern Massachusetts host a series of sulfide and oxide phases that resulted from interaction with sulfide-bearing meta-sedimentary host rocks. Euhedral arsenopyrite grains are found with ilmenite, apatite, and REE phosphates in zones that generally mimic the intersection between a gneissic fabric and a relict magmatic foliation. Arsenopyrite crystals are typically elongate with this lineation. Euhedral to subhedral pyrite crystals have also been observed, but are localized to areas without As-bearing phases. Micro-fractures that parallel either a steep NW-striking joint set or gently-dipping sheeting joints are commonly filled with interwoven calcite cements and As-bearing Fe-oxides. Surface coatings of major fracture sets are also characterized by Fe-As-rich rinds that host micron-scale sub-angular particles of quartz, feldspars, and phyllosilicates. Where micro-fractures are most concentrated, sulfide-bearing minerals are less common; however, subhedral to anhedral arsenopyrite grains do occur along some open micro-fractures. These crystals preserve lobate grain boundaries and are associated with As-bearing Fe-oxide-rich coatings along adjacent fractures. The presence of 1) pyrite, 2) arsenopyrite associated with phosphates, and 3) As-bearing fracture coatings suggests multiple stages of mineralization. We propose that intrusion-related fluid-rock interaction associated with heating of nearby sulfide-bearing schists of the Berwick Formation during Acadian orogenesis may have provided the necessary constituents for growth of sulfide phases in the Ayer. It appears that Late Devonian greenschist facies metamorphism and metasomatism led to mineralization that generated arsenopyrite and accompanying phosphates; however, the role of the cross-cutting Clinton Newbury Fault Zone as a conduit for hydrothermal fluids may also be important. Lower temperature As-bearing Fe-oxide and calcite coatings on open fractures surfaces may be associated with a change from lithostatic- to hydrostatic-pressures during post-glacial regional uplift. This mineralization appears to be synchronous with intense microfracturing that post-dates all other mineralization. JF - Abstracts with Programs - Geological Society of America PB - Geological Society of America (GSA) : Boulder, CO, United States CY - United States VL - 42 SN - 00167592 UR - https://gsa.confex.com/gsa/2010NE/finalprogram/abstract_169998.htm IS - 11 N1 - Accession Number: 2010-100047; Conference Name: Geological Society of America, Northeastern Section, 45th annual meeting; Geological Society of America, Southeastern Section, 59th annual meeting; Baltimore, MD, United States; Conference Date: 20100314; Language: English; Coordinates: N420800N424400W0710200W0715300; Coden: GAAPBC; Collation: 1; Collation: 160; Publication Types: Abstract Only; Serial; Conference document; Updated Code: 201052; Monograph Title: Geological Society of America, Northeastern Section, 45th annual meeting; Geological Society of America, Southeastern Section, 59th annual meeting; joint meeting, abstracts volume; Monograph Author(s): Anonymous; Reviewed Item: Analytic JO - Abstracts with Programs - Geological Society of America ER - TY - Generic T1 - Implications of diurnal river fluctuations on mass transport in a valley-fill aquifer T2 - Abstracts with Programs - Geological Society of America Y1 - 2006 A1 - Brandon J Fleming A1 - David F Boutt A1 - Stephen B Mabee KW - #StaffPubs KW - aquifers KW - BEDROCK KW - clastic sediments KW - controls KW - diffusion KW - diurnal variations KW - drainage KW - drift KW - Eastern U.S. KW - Environmental geology 22 KW - floods KW - fluctuations KW - geochemical cycle KW - geologic hazards KW - ground water KW - measurement KW - mixing KW - models KW - Northeastern U.S. KW - numerical models KW - nutrients KW - pollution KW - processes KW - pumping KW - quantitative analysis KW - residence time KW - sediments KW - shallow aquifers KW - surface water KW - three-dimensional models KW - tracers KW - transport KW - United States KW - valleys KW - water pollution KW - water resources KW - water wells AB - Aquifers located in isolated stratified drift deposits in the northeastern portion of the US are extremely fragile and important groundwater resources. These aquifers, when restricted to bedrock valleys, are often strongly coupled to significant surface water drainage systems. In northwestern Massachusetts, surface water associated with the Deerfield River watershed is highly regulated by dams to protect against flooding and to generate hydroelectric power. Regular releases of water from these dams cause diurnal fluctuations in river stage. In a previous study performed by the USGS, measurements from two clusters of wells show a significant response to river stage fluctuations in the aquifer. Fluctuations in river stage and resulting changes in head levels in the aquifer cause a switch from a losing to a gaining stream. The flow reversals have implications for mass transport and nutrient cycling within the hyporheic zone. In this paper we investigate the physical hydrologic controls on mass transport in the shallow aquifer. Using a coupled groundwater flow and transport code, we built a quasi three dimensional transient numerical model to approximate the head changes in the aquifer caused by the stage fluctuations in the river. Flow velocities and residence times were estimated in the aquifer for a variety of flow conditions. The mixing process driven by the aquifer head changes were quantified in the proximity of the hyporheic zone and shown to significantly influence both vertical and horizontal flow velocities in a region close to the stream-aquifer boundary. The diurnal river stage changes also appear to influence farfield hydrologic conditions and potentially hydrologically isolate the river and hyporheic zone. To further investigate these mixing processes we applied a mass transport code with conservative tracers to the aquifer. Fluctuation of the river stage combined with the heterogeneous nature of the aquifer creates a pumping mechanism that creates excess mixing within shallow portions of the aquifer. Aquifer dispersivity and molecular diffusion both contribute to the anomalous mixing modeled in the shallow aquifer. Mixing driven by stream stage changes has important implications for nutrient cycling as well as contaminant transport in the shallow aquifer. JF - Abstracts with Programs - Geological Society of America PB - Geological Society of America (GSA) : Boulder, CO, United States CY - United States VL - 38 SN - 00167592 UR - https://gsa.confex.com/gsa/2006AM/finalprogram/abstract_115285.htm IS - 77 N1 - Accession Number: 2010-061334; Conference Name: Geological Society of America, 2006 annual meeting; Philadelphia, PA, United States; Conference Date: 20061022; Language: English; Coden: GAAPBC; Collation: 1; Collation: 468; Publication Types: Abstract Only; Serial; Conference document; Updated Code: 201034; Monograph Title: Geological Society of America, 2006 annual meeting; Monograph Author(s): Anonymous; Reviewed Item: Analytic JO - Abstracts with Programs - Geological Society of America ER - TY - RPRT T1 - Report to the government of the British Virgin Islands on the status of beach erosion and water pollution Y1 - 1994 A1 - Belt, E.S. A1 - Davis, R.A. A1 - Stephen B Mabee KW - #StaffPubs KW - beach erosion KW - British Virgin Islands KW - erosion KW - pollution KW - Virgin Islands KW - water pollution ER -