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  1. No Access

    Article

    Groundwater movement, recharge, and perchlorate occurrence in a faulted alluvial aquifer in California (USA)

    Perchlorate from military, industrial, and legacy agricultural sources is present within an alluvial aquifer in the Rialto-Colton groundwater subbasin, 80 km east of Los Angeles, California (USA). The area is ...

    John A. Izbicki, Nicholas F. Teague, Paul B. Hatzinger… in Hydrogeology Journal (2015)

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    Article

    Continental degassing of 4He by surficial discharge of deep groundwater

    Helium-4 is produced in the Earth’s crust and degassed to the atmosphere. Measurements of 4He and 81Kr dating in an aquifer in Brazil suggest that most crustal 4He reaches the atmosphere by the discharge of deep ...

    Pradeep K. Aggarwal, Takuya Matsumoto, Neil C. Sturchio, Hung K. Chang… in Nature Geoscience (2015)

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    Article

    The hydrothermal system of Volcan Puracé, Colombia

    This paper presents chemical and isotopic data for thermal waters, gases and S deposits from Volcan Puracé (summit elevation ∼4600 m) in SW Colombia. Hot gas discharges from fumaroles in and around the summit ...

    Neil C Sturchio, Stanley N Williams, Yuji Sano in Bulletin of Volcanology (1993)

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    Article

    The hydrothermal system of Nevado del Ruiz volcano, Colombia

    Hot springs and steam vents on the slopes of Nevado del Ruiz volcano provide evidence regarding the nature of hydrothermal activity within the summit and flanks of the volcano. At elevations below 3000 m, alka...

    Neil C. Sturchio, Stanley N. Williams, Nestor P. Garcia… in Bulletin of Volcanology (1988)

  5. No Access

    Article

    The origin of small-scale geochemical and mineralogic variations in a granite intrusion

    A post-tectonic unzoned granite intrusion in the Meatiq Dome, a Late Proterozoic metamorphic complex in the Central Eastern Desert of Egypt, shows significant chemical and mineralogic heterogeneity on the scal...

    Mohamed Sultan, Rodey Batiza, Neil C. Sturchio in Contributions to Mineralogy and Petrology (1986)

  6. No Access

    Article

    Origin of low-18O metamorphic rocks from a Late Proterozoic shear zone in the Eastern Desert of Egypt

    Anomalously low and variable 18O/16O ratios (whole rock δ 18OSMOW=−1.9 to +6.0) have been measured in several Late Proterozoic metamorphic units associated with a large scale low-angle ductile shear zone at Meati...

    Neil C. Sturchio, Karlis Muehlenbachs in Contributions to Mineralogy and Petrology (1985)