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Radiogenic and Stable Isotope Methods - Publications of Recent Research

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Ayuso, R.A., 2010, Chapter N: Petrology of Associated Igneous Rocks, Isotope Geochemistry and Radiogenic Isotopes of Ore,: in John, D.A., ed., Mineral Deposit Models for Resource Assessment: Porphyry Copper Deposit Model: U.S. Geological Survey, Scientific Investigations Report, SIR 2010-5070-B, p. 100-107.

Ayuso, R., Haeussler, P, Bradley, D., Wandless, G., and Foley, N., 2009, The role of ridge subduction in determining the geochemistry and Nd-Sr-Pb isotopic evolution of the Kodiak batholith in southern Alaska: Tectonophysics, 464, 137–163. doi:10.1016/j.tecto.2008.09.029

Ayuso, R., Tucker, R., Peters, S., Foley, N.K. Jackson, J., Robinson, S., Bove, M., 2013. Preliminary radiogenic isotope study on the origin of the Khanneshin carbonatite complex, Helmand Province, Afghanistan: Journal of Geochemical Exploration, v. 133. p. 6-14.

Ayuso, R.A., and Till, A.B., 2014, Geochemical and Nd-Sr-Pb isotopic evolution of metabasites from rifting of continental lithosphere, Seward Peninsula, Alaska, and implications for paleogeographic reconstruction, in Dumoulin, J.A., and Till, A.B., eds., Reconstruction of a late Paleozoic to Devonian Continental Margin Sequence, Northern Alaska, its Paleogeographic Significance, and Contained Base-Metal Sulfide Deposits: Geological Society of America, Special Paper 506, p. 133-172. Abstract online at http://specialpapers.gsapubs.org/content/506/133.short .

Ayuso, R.A., Foley, N., and Lipfert, G., 2009, Lead isotopes as monitors of anthropogenic and natural sources affecting the surficial environment: in Lima, A., ed., Environmental Geochemistry: Site Characterization, Waste Disposal, Data Analysis, and Case Histories, Elsevier Publications, 350 p, Chapter 12, p. 292-320.

Ayuso, R.A., Foley, N.K., Indela, R., Jackson, J., Robinson, S., and Wandless, G., 2012, Radiogenic isotope constraints on the sources of the Khanneshin Carbonatite Complex, Helmand Province, Afghanistan, Chapter 2, p. 60-71: U.S. Geological Survey, Administrative Report, September 2012: in Peters, S., ed. Summary of FY 2012 Activities for Mineral Investment and Production Opportunities in Afghanistan—Non-fuel Minerals (CD), 93p.

Ayuso, R.A., Foley, N.K., Seal, R., Bove, M., Civitillo, D., Cosenza, A., and Grezzi, G., 2013, Lead isotope evidence for metal dispersal at the Callahan Cu-Zn-Pb mine: Goose Pond tidal estuary, Maine, USA: Journal of Geochemical Exploration, v. 126, p. 1-22.

Ayuso, R.A., Foley, N.K., Wandless, G.A., Indela, R., Bove, M., Forni, F., and Jackson, J., 2010, A preliminary report to US-EPA on sources of lead contamination in groundwater and soils, former Mohr Orchard, North Whitehall Township, Lehigh County, Pennsylvania: U. S. Geological Survey, Administrative Report to the US -EPA, 23 p.

Ayuso, R.A., Foley, N.K., Wandless, G.A., Indela, R., Forni, F., Bove, M., and Jackson, J.J., 2012, Sources of lead contamination in well water and soils, Former Mohr Orchard, Pennsylvania: U.S. Geological Survey Administrative Report, 48p, 4 tables.

Ayuso, R.A., Foley, N.K., Wandless, G.A., Indela, R., Forni, F., Bove, M., and Jackson, J.J., 2014, Sources of lead contamination in well water and soils, Former Mohr Orchard, Pennsylvania: U.S. Geological Survey Administrative Report, 25p, 7 tables. 

Ayuso, R.A., Kelley, K.D., Eppinger, R.G., and Forni, F., 2013, Pb-Sr-Nd isotopes in surficial materials at the Pebble porphyry Cu-Au-Mo deposit, southwestern Alaska: Can the mineralizing fingerprint be detected through cover: Economic Geology Special Issue on the Pebble Porphyry Cu-Au-Mo Deposit, vol. 108, no. 3, p. 543-562 .

Ayuso, R.A., Till, A.B., Slack, J.F., and Forni, F, 2014, Pb isotope geochemistry of SEDEX deposits and occurrences, Nome Complex, Seward Peninsula, Alaska: Metal sources and regional comparisons, in Dumoulin, J.A., and Till, A.B., eds., Reconstruction of a late Paleozoic to Devonian Continental Margin Sequence, Northern Alaska, Its Paleogeographic Significance, and Contained Base-Metal Sulfide Deposits: Geological Society of America, Special Paper 506, p. 133-172.

Bove, M.A., Ayuso, R.A., De Vivo, B., Lima, A., and Albanese, S., 2011, Geochemical and isotopic study of soils and waters from an Italian contaminated site: Agro Aversano (Campania): Journal of Geochemical Exploration, v. 109, p. 38-50.

Civitillo, D., Ayuso, R., Lima,A., Albanese, S., and De Vivo, B. 2014, Toxic element distribution and Pb isotope composition of soil and tap water in a highly urbanized and industrialized area near Naples, Italy: (journal review, Science of the Total Environment). 

Cosenza A., Ayuso R. A., Foley N., Albanese S., Lima A., Messina A., and De Vivo B., 2014, The geogenic vs. anthropogenic source of element anomalies in Eastern-Central Peloritani Mountains (Sicily, Italy): Rend. Online Soc. Geol. It., V. 21, p. 265-267 Società Geologica Italiana, Roma.

Cosenza A., Ayuso R. A., Foley N., Albanese S., Lima A., Messina A., and De Vivo B., 2014, Tracing geogenic vs. anthropogenic source of metal anomalies in Eastern-Central Peloritani Mountains (Sicily, Italy): (Journal review, Geochemistry: Exploration, Environment, Analysis)

Di Martino, C., Forni, F., Frezzotti, M., Palmeri, R., Webster, J.D., Ayuso, R.A., Lucchi, F., and Tranni., C., 2011, Formation of cordierite-bearing lavas during anatexis in the lower crust beneath Lipari Island (Aeolian arc, Italy): Contributions to Mineralogy and Petrology, 162, p. 1011-1030.

Foley, N.K., Ayuso, R.A., 2013. Rare earth element mobility in high-alumina altered metavolcanic deposits, South Carolina, USA, Journal of Geochemical Exploration, v. 133, p. 50-67

Foley, N.K., Ayuso, R.A., Bern, C.R., Hubbard, B.E., and Vazquez, J.A., 2014, REE distribution and mobility in regolith formed on granite bedrock of the southeast United States: IAGOD meeting, Kumming, China: August, 2014, in press.

Foley, Nora K., and Ayuso, Robert A., 2012, Gold deposits of the Carolina Slate Belt, southeastern United States: Age and origin of the major gold producers: US Geological Survey Open-file Report 2012-1179, 26p.

Giaccio, L., Grezzi, G., Lima, A., Ayuso, R., De Vivo, B., Cicchella, D., Albanese, S., Bove, M., 2011, Atlante geochimico-ambientale del S.I.N. (Sito di interese nazionale) Litorale domizio-flegreao e agro aversano—Geochemical Environmental Atlas of Sito di Interesse Nazionale, Domizio-Flegreo Littoral and Agro Aversano: University of Naples Publications, Naples, Italy, 224p.

Grezzi, G., Ayuso, R.A., De Vivo, B., Lima, A., and Albanese, S., 2011, Lead isotopes in soils and groundwaters as tracers of the impact of human activities on the surface environment: The Domizio-Flegreo Littoral (Italy) case study: Journal of Geochemical Exploration, v. 109, p. 51-58.

Ludington, S., Ayuso, R.A., Hammarstrom, J.M., Zientek, M.L., and Qiu, R., 2011, Non-subduction porphyry copper deposits a comparison between Asia and North America: 11th SGA Biennial Meeting, p. 31-33.
Abstract online at http://e-sga.org/index.php?id=231&tx_commerce_pi1%5BshowUid%5D=1675&tx_commerce_pi1%5BcatUid%5D=45&cHash=057cac8b00

Seal, R.R., and Ayuso, R.A., 2011, Understanding processes affecting mineral deposits in humid environments: U.S. Geological Survey Fact Sheet 2010-3105, 6 p.

Tappa, M., Ayuso, R.A., Bodnar, R.J., Aylor, J.G., Beard, J., Henika, W.S., Vazquez, J., and Wooden, J., 2014, Age of host rocks at the Coles Hill uranium deposit, Pittsylvania County, Virginia, USA, based on zircon U-Pb geochronology: Economic Geology, v. 109, p. 513-530. http://econgeol.geoscienceworld.org/content/109/2/513.abstract

Till, A.B., Dumoulin, J.A., Ayuso, R.A., Aleinikoff, J.N., Amato, J.M., Slack, J.F., and Shanks W.C., III, 2014, Reconstruction of an early Paleozoic continental margin based on the nature of protoliths in the Nome Complex, Seward Peninsula, in Dumoulin, J.A., and Till, A.B., eds., Reconstruction of a late Paleozoic to Devonian Continental Margin Sequence, Northern Alaska, Its Paleogeographic Significance, and Contained Base-Metal Sulfide Deposits: Geological Society of America, Special Paper 506, p. 133-172. http://specialpapers.gsapubs.org/content/506/1.short

 

Publications of past research:

Arth, J.G., and Ayuso, R.A., 1997, The Northeast Kingdom Batholith, Vermont: Geochronology and Nd, O, Pb, and Sr isotopic constraints on the origin of Acadian granitic rocks : in Sinha, A.K., Whalen, J.B., and Hogan, J.P., eds., The Nature of Magmatism in the Appalachian Orogen: Geological Society of America, Memoir 191, January 1997, p. 1-18.

Ayuso, R.A., 1998, Radiogenic isotopes and the Eastern Mineral Resources Program: U.S. Geological Survey, Information Sheet, 4 p. Online at http://pubs.usgs.gov/info/ayuso2/.

Ayuso, R.A., 1998, Carolina slate belt gold deposits in Virginia, North Carolina, South Carolina, and Georgia: U.S. Geological Survey Information Handout, 2 p. Online at http://pubs.usgs.gov/info/ayuso1/.

Ayuso, R.A., 1999, Geochemical and metallogenic contrasts in Paleozoic granitic rocks from terranes in the northern New England Appalachians: in Geological Society of America, Special Paper 331,Terranes of the New England Appalachians, p.121-154.

Ayuso, R.A., and Arth, J.G., 1997, The Spruce Head composite pluton: An example of mafic to silicic Salinian magmatism in coastal Maine, northern Appalachians: in Sinha, A.K., Whalen, J.B., and Hogan, J.P., eds., The Nature of Magmatism in the Appalachian Orogen: Geological Society of America, Memoir 191, January 1997, p. 19-43.

Ayuso, R.A., Callender, E., and VanMetre, P., 2001, Pb isotopes of lake sediments and effects of human activities on water quality: in Cidu, R., ed., Proceedings of the Tenth International Symposium on Water Rock Interaction WRI-10, vol. 2, Balkema publishers, p. 1473-1475.

Ayuso, R., and DeVivo, B., Piocci, M., and Somma, R., 2004, Diverse magma sources and crustal contamination processes at Mt. Somma-Vesuvius, Italy: geochemical and Sr-isotopical evidence (abs.): International Geological Congress, Florence, August 20-28, 2004, Abstract Volume 1, p. 511, session 106.

Ayuso, R.A., De Vivo, B., Rolandi, G., Seal, R.R., II, and Paone, A., 1998, Geochemical and isotopic (Nd-Pb-Sr-O) variations bearing on the genesis of volcanic rocks from Vesuvius, Italy: Journal of Volcanology and Geothermal Research, v. 82, p. 53-78.

Ayuso, R.A., and N.K. Foley, 2008, Anthropogenic and natural lead isotopes in Fe-hydroxides and Fe-sulfates in a watershed associated with arsenic-enriched groundwater, Maine, U.S.A: Geochemistry: Exploration, Environment, and Analysis, v. 8, p. 77-89.

Ayuso, R.A., and Foley, N., 2008, Lead isotopes as monitors of anthropogenic and natural sources affecting the surficial environment, Elsevier Special Publications: Developments in Environmental Geochemistry, Chapter 12, in press (35p.).

Ayuso, R.A., Foley, N.K., Ayotte, J.D., Lyon, A., Burns, J., Marvinney, R.G., Reeve, A., and Robinson, G., 2002, Pb isotopes, arsenic sources and enrichment pathways linking sulfides from mines and unmineralized rocks to secondary iron oxides, coastal New England [abs.]: Arsenic in New England: A multidisciplinary Scientific Conference 2002, New Hampshire Consortium on Arsenic, Program with abstracts, p. 29.

Ayuso, R., Karl, S.M., Slack, J.F., Haeussler, P., Wandless, G., and Colvin, A., 2007, Oceanic Pb Isotope Sources Associated with Proterozoic and Paleozoic Volcanogenic Massive Sulfide Deposits: Southern Prince of Wales Island and Vicinity, Southeast Alaska: U.S. Geological Survey Professional Paper 1732-E, Studies by the U.S. Geological Survey in Alaska (35 p.).

Ayuso, R.A., and Kelley, K.D., 2008, Radiogenic Isotope Studies, in Kelley, K.D., editor, Regional Fluid Flow and Basin Modeling: U.S. Geological Survey Circular 1319, p. 20-23.

Ayuso, R.A., and Kelley, K.D., 2007, Tracing metal sources of Zn-Pb-Ag deposits in the Brooks Range, Alaska: Pb-Sr-Nd isotope constraints (abs.): The 23rd International Applied Geochemistry Symposium (IAGS 2007), Oviedo, Spain, 14-19 June, p. 110.

Ayuso, R.A., Kelley, K.D., Leach, D. L., Young,L. E., Slack, J. F., Wandless,G., Lyon, A. A. M., and Dillingham, J. L., 2004, Origin of the Red Dog Zn-Pb-Ag Deposits, Brooks Range, Alaska: Evidence from Regional Pb and Sr Isotope Sources, in Economic Geology and the Bulletin of the Society of Economic Geologists Volume 99 Number 7, A Special Issue Devoted to Barite and Zinc-Lead-Silver Deposits in the Red Dog District, Western Brooks Range Northern Alaska, pp. 1533-155.

Ayuso, R., Piochi, M., De Vivo, B., and Somma, R., 2005, Crustal contamination and crystal entrapment in volcanic rocks from Mt. Somma-Vesuvius volcano, Italy: Geochemical and Sr isotope Evidence (abs.): in International Workshop on Vesuvius and Volcanism of the Campanian Plain, southern Italy, Naples, Oct. 4-6, 2004, De Vivo, B., ed., p. 11-12.

Ayuso, R.A., Seal, R.R., Foley, N.K., and Offield, T.O., 1998, Genesis of gold deposits in the Carolina slate belt, USA: Constraints from comparative mineralogy, trace elements, fluid evolution and isotopic variations[abs.]: Society of Mining Engineers, Annual Meeting, Orlando, Florida, p. 62.

Ayuso, R.A., Sinha, A.K., Seal, R.R., Foley, N.K., and Offield, T.O., 1999, Gold deposits of the Carolina slate belt: zircon geochronology and isotopic characteristics [abs]: Geological Society of America, Abstracts with Programs, v. 31, p. A-3.

Ayuso, R.A., and Schulz, K.J., 2002, Nd-Pb-Sr isotope geochemistry and origin of the Ordovician Bald Mountain and Mount Chase massive sulfide deposits, northern Maine: in Goodfellow, W.D., and others, editors, Volcanogenic massive sulfide deposits of the Bathurst district and northern Maine: Economic Geolgy Monograph 12.

Ayuso, R.A., and Till, A.B., 2007, Geochemical and Nd-Pb isotopic evolution of metabasites from attenuated continental lithosphere, Nome Group, Seward Peninsula, Alaska (abs.): Geological Society of America, Abstracts with Programs, Vol. 39, no. 6, p. 489.

Ayuso, R.A., Wooden, J.N., Foley, N.K., Slack, J.F., Sinha, A.K., and Persing, H., 2002, Pb isotope geochemistry and zircon (SHRIMP-RG ion microprobe) age of the Bald Mountain deposit, northern Maine: Ordovician massive sulfide product of mantle and crustal contributions: in Goodfellow, W.D., and others, editors, Volcanogenic massive sulfide deposits of the Bathurst district and northern Maine: Economic Geolgy Monograph 12.

Ayuso, R.A., Wooden, J.N., Foley, N.K., Seal, R.R., Sinha, A.K., 2005, U-Pb Zircon Ages and Pb Isotope Geochemistry of Gold Deposits in the Carolina Slate Belt of South Carolina: in Economic Geology, v. 100, pp. 225-252.

Bratton, J.F., Colman, S.M., Seal, R.R., II, and Murray, R.W., 1998, Anoxia history in Chesapeake Bay based on nitrogen isotopes and redox-sensitive metals [abs.]: EOS, Transactions, Amer. Geoph. Union, Fall Meeting, v. 79, p. F496.

Carmody, R.W., and Seal, R.R., II, 1999, Evaluation of the sulfur isotopic composition and homogeneity of the Soufre de Lacq reference material, Chemical Geology, v. 153, p. 289-295.

Cortini, M., Ayuso, R.A., DeVivo, B., Holden, P., and Somma, R., 2004, Isotopic composition of Pb and Th in interplinian volcanics from Somma-Vesuvius volcano, Italy: Mineralogy and Petrology, v. 80, p. 83-96.

De Vivo, B., Ayuso, R.A., Belkin, H.E., Black, S., Macdonald, R., McGeehin, J.P., Paone, A., Rolandi, G., Rubin, M., Torok, K., and Webster, J.D., 1998, Geochemical and isotopic (Nd-Pb-Sr-O and U-Th series) variations, fluid-melt inclusion studies and C dating bearing on the genesis and evolution of volcanic rocks from Mt-Somma-Vesuvius, Italy, XIV ECROFI, European Current Research on Fluid Inclusions, July 1-4, Nancy, France, p. 84-85.

De Vivo, B., Somma, R., Ayuso, R.A., Calderoni, G., Lima, A., Pagliuca, S., and Sava,A., 2002, Pb isotopes and toxic metals in floodplain and stream sediments from the Volturno River basin, Italy. Environmental Geology (Berlin). v. 41, no. 1-2, November 2001. p. 101-112.

De Vivo, B., Ayuso, R.A., Belkin, H.E., Black, S., Macdonald, R., Paone, A., Rolandi, G., Torok, K., and Webster, J.D., 1998, Nuovi dati geochimici isotopici e inclusioni silicatiche su prodotti di tutta l'attivita del Vesuvio (da 25000 ybp al 1944): CNR-Gruppo Nazionale per la Vulcanologia Provincia Regionale di Catania, XIV Convegno Scientifico Annuale del Gruppo Nazionale per la Vulcanolgia, p. 6-7.

Foley, N.K., and Ayuso, R.A., 2008, Mineral sources and transport pathways for arsenic release in a coastal watershed, USA, in Geochemistry: Exploration, Environment, Analysis; February 2008; v. 8; no. 1; p. 59-75.

Foley, N.K., Ayuso, R.A., Ayotte, J., Marvinney, R., Reeve, A., and Robinson, G., 2002, Mineralogical pathways for arsenic in weathering of metashales: an analysis of regional and site studies in the northern Appalachians [abs]: Arsenic in New England, a multidisciplinary scientific conference 2002, New Hampshire Consortium on Arsenic, Program with abstracts, p. 35.

Foley, N.K., Ayuso, R.A., Ayotte, J., Marvinney, R., Reeve, A., and Robinson, G., 2002, Mineralogical pathways for arsenic in weathering of metashales: an analysis of regional and site studies in the northern Appalachians [abs]: Arsenic in New England, a multidisciplinary scientific conference 2002, New Hampshire Consortium on Arsenic, Program with abstracts, p. 35.

Foley, N., Ayuso, R., Dillingham, J., West, N., Robinson, G., and J. Ayotte, 2007., Geological Assessment of Core Extracted from the Great Bay National Wildlife Refuge, New Hampshire: U.S. Geological Survey Scientific investigations report 2006-5203. Online at http://pubs.usgs.gov/sir/2006/5203/. 50p.

Foley, N.K., Ayuso, R.A., and Seal, R.R., 2001, Remnant colloform pyrite at the Haile gold deposit, South Carolina: A textural key to genesis: Economic Geology, v. 96, p. 891-902.

Foley, N.K., Ayuso, R.A., and Seal, R.R. II, 2007, Gold deposits in the Avalonian tectonic zone of the Southeastern United States: Society of Applied Geology Transactions (SAG), Balkema Special Publications, v. 2, p. 375-377.

Gilg, H.A., Lima., A., Somma, R., Belkin, H.E., DeVivo, B., and Ayuso, R.A., 2001, Isotope geochemistry and fluid inclusion study of skarns from Vesuvius: Mineralogy and Petrology, V. 73, p. 145-176.

Goldfarb, R., Ayuso, R., Miller, M., Ebert, Marsh, E., Petsel, S., and Miller, L., 2004, Metallogeny of the superlarge Donlin Creek gold deposit, southwestern Alaska (abs.): International Geological Congress, Florence, August 20-28, 2004, Abstract Volume 1, p. 655, session 143

Guidotti, C. V., Schoonmacher, Adam, Berry, H. N., IV, and Ayuso, Robert, 2005, Bedrock geology of the Thomaston quadrangle, Maine: Maine Geological Survey, Open-File Report, 1:24,000 scale.

Karl, S.M., Ayuso, R.A., Slack, J.F., and Haeussler, P.J., 2007, Evolution of the Alexander terrane oceanic arc, southeast Alaska, reflected in Proterozoic to Triassic rift-associated "VMS deposits (abs.): Arizona Geological Society meeting, Tucson, Az.  

Kelley, K. D., Leach, D. L., Johnson, C. A., Clark, J. L., Fayek, M., Slack, J. F., Anderson,V. M., . Ayuso, R. A., and Ridley, W. I., 2004, Textural, Compositional, and Sulfur Isotope Variations of Sulfide Minerals in the Red Dog Zn-Pb-Ag Deposits, Brooks Range, Alaska: Implications for Ore Formation , in Economic Geology and the Bulletin of the Society of Economic Geologists, Volume 99, Number 7, A Special Issue Devoted to Barite and Zinc-Lead-Silver Deposits in the Red Dog District, Western Brooks Range, Northern Alaska, pp. 1509-1532.

Klein, T.L., Cunningham, C.G., Logan, M.A.V., Seal, R.R., II, and Offield, T.W., 1998, Russell gold mine - a submarine exhalative gold deposit in the Carolina Slate Belt [abs.]: Geological Society of America, Abstracts with Programs, v. 30, p. A368.

Krishnaswamy, R., and Seal, R.R., II, 1998, Ecological and carbon isotope data for acidophilic algae from abandoned mine sites in Vermont and Virginia [abs.]: Geological Society of America, Abstracts with Programs, v. 30, p. A129.

Lipfert, G., Sidle, W.C., Reeve, A.S., Ayuso, R.A., and Boyce, A.J., 2007, High arsenic concentrations and enriched sulfur and oxygen isotopes in a fractured-bedrock ground-water system: Chemical Geology, v. 242, p. 385-399.

Martiny, B., Martinez-Serrano, R., Moran-Zenteno, D., Macias-Romo, C., and Ayuso, R.A., 2000, Stratigraphy, geochemistry and tectonic significance of the Oligocene magmatic rocks of western Oaxaca, southern Mexico: Tectonophysics, v. 318, p. 71-98.

Mauk, J.L., Hoskin, P.W.O., and Seal, R.R., II, 1998, Morphology of pyrite and marcasite at the Golden Cross mine, New Zealand: Water-Rock International Proceedings Volume.

Paone, A, Ayuso, R.A., De Vivo, B, 1998, Somma-Vesuvius volcano: a survey of metallogenic features, Cities on Volcanoes, June 28-July 4, 1998 Rome-Naples Symposium, p. 123.

Paone, A, Ayuso, R.A., De Vivo, B., and Seal, R.R, 1998, The geochemistry of basalts, tephrites and latites of the Campanian Plain: Major, minor, trace element and isotope (Nd-Pb-O) data, Cities on Volcanoes, June 28-July 4, 1998 Rome-Naples Symposium, p. 101.

Paone, A., Ayuso, R.A., DeVivo, B, 1998, The geochemisty and metallogeny of the Campanian Plain in southern Italy: International Workshop on Volcanic Risk Mitigation, Ercolano, Italy, 8 p.

Paone, A., Ayuso, R.A., DeVivo, B, 2001, A metallogenic survey of alkalic rocks of Somma-Vesuvius volcano, Mineralogy and Petrology, v. 73, p. 201-232.

Paone, A., Ayuso, R.A., DeVivo, B., and Seal, R.R. II, 1998, The geochemistry of basalts, tephrites and latites of the Campanian Plain: Major, minor, trace element, and isotope (Nd-Pb-O) data: International Meeting on Volcanic Hazards and Urban Areas, Naples, Italy, July, 1998.

Paone, A., Ayuso, R.A., and DeVivo, B., 1998, Somma-Vesuvius volcano: A survey of metallogenic features: International Meeting on Volcanic Hazards and Urban Areas, Naples, Italy, July, 1998.

Raia, F., Ayuso, R.A., and DeVivo, B., 2007, Origin of Panarea Island and basement  reconstructions of the Mediterrenean Sea (abs.): American Geophysical Union Annual Meeting, San Francisco.

Reeve, A., Horesh, M., Marvinney, R., and Ayuso, R., 2002, Arsenic geochemistry in a bedrock aquifer, Northport, Maine [abs]: Arsenic in New England, a multidisciplinary scientific conference 2002, New Hampshire Consortium on Arsenic, Program with abstracts, p. 20.

Robinson, G.R., Jr., Ayotte, J.D., and Ayuso, R. A., 2000, Occurrence of arsenic in ground waters, soils, and rocks, and controls on mobility in ground water from bedrock acquifers in New England [abs]: American Geophysical Union, v. 134, p. EG234.

Schulz, K.J., and Ayuso, R.A., 2002, Geochemistry and tectonic setting of volcanic host rocks to the Bald Mountain massive sulfide deposit, northern Maine, in Goodfellow, W.D., et al., eds., Volcanogenic massive sulfide deposits of the Bathurst district and northern Maine: Economic Geology Monograph 12.

Schulz, K.J., and Ayuso, R.A., 1998, Crustal recycling in the evolution of the Penokean Orogen: Isotopic evidence for Archean contributions to crustal growth in the Pembine-Wausau terrane, northern Wisconsin: Lake Superior Institute Annual Meeting, 1998 .

Schulz, K.J., and Ayuso, R.A., 1997, Evolution of the Early Proterozoic Penokean Orogen: Nd and Pb isotope evidence for crust-mantle interaction [abs.]: Geological Society of America, Abstracts with Program, v. 29, p. A-451.

Schulz, K.J., and Ayuso, R.A., 1998, Geochemistry of Ordovician volcanic rocks, northern Maine and implications for the tectonic settings of the Bald Mountain and Mt. Chase massive sulfide deposits [abs.]: Geological Society of America, Abstracts with Programs, v. 30, p. A-18.

Seal, R.R., II, Ayuso, R.A., Foley, N.K., and Clark, S.H.B., 2001, Sulfur and lead isotope geochemistry of hypogene mineralization at the Barite Hill gold deposit, Carolina slate belt, southeastern United States: a window into and through regional metamorphism, in Mineralium Deposita, v. 36, p. 137-148.

Seal, R.R., II, Hammarstrom, J.M., Johnson, A.N., Piatak, N.M., and Wandless, G.A., 2008, Environmental geochemistry of a Kuroko-type massive sulfide deposit at the abandoned Valzinco mine, Virginia, USA.  Applied Geochemistry, 23, p. 320-342.

Seal, R.R., II, Hammarstrom, J.M., Meier, A.L., and Flohr, M.J.K., 1997, Controls on geochemical signatures of mine drainage from volcanic- and sediment-hosted massive sulfide deposits in the eastern United States [abs.]: Geological Society of America, Abstracts with Programs, v.29.

Seal, R.R., II, and Shanks, W.C., III, 1998, Oxygen and hydrogen isotope systematics of Lake Baikal, Siberia: Implications for paleoclimate studies, Limnology and Oceanography, v. 43, p. 1251-1261.

Seal, R.R., II, and Shanks, W.C., III, 2008, Sulfide oxidation: Insights from experimental, theoretical, stable isotope, and predictive studies in the field and laboratory. Applied Geochemistry, 23, p. 101-102.

Seal, R.R., II, and Wandless, G.A., 1997, Stable isotope characteristics of waters draining massive sulfide deposits in the eastern United States [abs.]: Fourth International Symposium on Environmental Geochemistry Program with Abstracts.

Seal, R.R., II, Wandless, G.A., and Slack, J.F., 1997, Genetic significance of sulphur isotope differences between the Bald Mountain and Mount Chase massive sulphide deposits, northern Maine, U.S.A. [abs.]: GAC/MAC Abstracts with Program, v. 22, p. A134.

D. R. Shawe, J. D. Hoffman, D. R. Shawe, B. R. Doe, E. E. Foord, H. J. Stein, and R. A. Ayuso, 2003, Geochemistry, geochronology, mineralogy, and geology suggest sources of and controls on mineral systems in the southern Toquima Range, Nye County, Nevada; with geochemistry maps of gold, silver, mercury, arsenic, antimony, zinc, copper, lead, molybdenum, bismuth, iron, titanium, vanadium, cobalt, beryllium, boron, fluorine, and sulfur; and with a section on lead associations, mineralogy and paragenesis, and isotopes, U.S. Geological Survey, MF-2327-C, 5 sheets (Accompanied by 65 page text.).

Slack, J.F., Foose, M.P., Schulz, K.J., Busby, C.J., Ayuso, R.A., Sinha, A.K., and Harris, A.G., 1999, The Bald Mountain terrane, Aroostook County, ME: A composite island arc assemblage exotic to the Ordovician Winterville Formation [abs.]: Geological Society of America, Abstracts with Programs, v. 31, p. A-451.

Slack, J.F., Till, A.B., Ayuso, R.A., Shanks, W.C., III, Dumoulin, J.A., Amato, J.M., Aleinikoff, J.N., and Bleick, H.A., 2008, SEDEX Zn-Pb-Ag-Au deposits of the Paleozoic Nome Group, southwestern Seward Peninsula, Alaska: Roundup 2008 Conference, January 27-31, 2008, Vancouver, B.C., Canada, Poster Session, Association for Mineral Exploration British Columbia.

Somma, R., Ayuso, R.A., and De Vivo, B., 2000, Geochemical and Sr isotopic evolution of plinian and interplinian rocks from Mt. Somma-Vesuvius [abs]: American Geophysical Union, v. 81, S440.

Somma, R., Ayuso, R.A., De Vivo, B., Rolandi, G., and Seal, R.R, 1998, A geochemical and isotopic (Sr-Nd-Pb-O) comparison of the volcanic rocks erupted during the Medieval (472-1631 A.D.,) and Recent (1631-1944 A.D.) "interplinian" activity of Somma-Vesuvius volcano (southern Italy): International Workshop on Volcanic Risk Mitigation, Ercolano, Italy, 7 p.

Somma, R., De Vivo, B., Rolandi, G., Ayuso, R.A., Seal, R.R., 1998, Volcanological, geochemical, and isotopic (Sr-Nd-Pb-O) features of Medieval and Recent interplinian activity at Mount Somma-Vesuvius, Cities on Volcanoes, June 28-July 4, 1998 Rome-Naples Symposium, p. 129.

Stewart, D.B., Tucker, R.D., Ayuso, R.A., and Lux, D.R., 1998, Tectonic setting of the Isleboro terrane and a minimum age of the Seven hundred Acre Island Formation, the oldest rocks in Maine [abs.]: Geological Society of America, Abstracts with Program, v. 30, p. A-65.

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