Neil C. Sturchio

University of Delaware

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Paul Fenter

Argonne National Laboratory

Mohamed Sultan

Western Michigan University

Linnea J. Heraty

University of Delaware

Roland Purtschert

University of Bern

Zheng‐Tian Lu

University of Science and Technology of China

J.K. Böhlke

United States Geological Survey

Reika Yokochi

University of Chicago

Kathryn L. Nagy

University of Illinois Chicago

Sang Soo Lee

Argonne National Laboratory

Paul B. Hatzinger

Rho (United States)

Cooperative Institutions

Argonne National Laboratory

University of Illinois Chicago

United States Geological Survey

Oak Ridge National Laboratory

University of Chicago

Planetary Science Institute

Western Michigan University

University of Delaware

Centre National de la Recherche Scientifique

Northwestern University

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Temporal and spatial differences in deposition of organic matter and black carbon in Lake Michigan sediments over the period 1850–2010

Journal of Great Lakes Research (2018)

Solidea Bonina Garry Codling Margaret B. Corcoran Jiehong Guo John P. Giesy

Deposition

Sedimentation

10.1016/j.jglr.2018.03.001

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Citations (17)

Age and isotopic constraints on Pleistocene pluvial episodes in the Western Desert, Egypt

Palaeogeography Palaeoclimatology Palaeoecology (1997)

M. K. Crombie R. E. Arvidson Neil C. Sturchio Z. El Alfy Kamal A. Abu Zeid

Pluvial

Speleothem

10.1016/s0031-0182(96)00134-4

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Citations (139)

Using 81 Kr-age of groundwater in the Guarani Aquifer, Brazil, to constrain estimates of continental degassing flux of 4 He

AGU Fall Meeting Abstracts (2013)

Pradeep Aggarwal Takuya Matsumoto Neil C. Sturchio Hyungjoon Chang Didier Gastmans

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Tracing time scales of fluid residence and migration in the crust (Invited)

AGUFM (2013)

Reika Yokochi Neil C. Sturchio Roland Purtschert Wangang Jiang Zhitang Lu

Tracing

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Quantification of minor phases in growth kinetics experiments with powder X-ray diffraction

American Mineralogist (2000)

John M. Hanchar Kathryn L. Nagy Paul Fenter Robert J. Finch Donald J. Beno

Minor amounts of clay minerals precipitated from aqueous solution can be rapidly identified and quantified in a mineral mixture with powder X-ray diffraction using a rotating-anode source and a position-sensitive detector. For the case of gibbsite precipitated on a kaolinite powder substrate we demonstrate a simple method having a minimum detection limit of 0.1 wt%, using pure gibbsite as the intensity reference in mechanical mixtures of gibbsite and kaolinite. The amount of gibbsite precipitated onto kaolinite at 80 °C, pH 3 is higher when determined from solution chemistry than from the X-ray method, and the difference in amounts increases with increasing Al concentration in solution. This discrepancy can be explained by assuming that a fraction of the precipitated material is effectively invisible to the X-ray diffraction technique, either due to a small diffracting domain size along the gibbsite [001] direction or formation of an Al-phase that is amorphous to X-rays. This method should be generally useful for a range of mineral mixtures where at least one intense reflection for the phase of interest is not obscured. The ability to identify, characterize, and quantify trace phases by X-ray diffraction, especially when combined with surface analysis by electron or atomic force imaging, is an important complement to the conventional approach of monitoring solution composition in growth kinetics experiments.

Gibbsite

Powder Diffraction

10.2138/am-2000-8-915

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Citations (13)

Groundwater dating and past climate reconstruction

Roland Purtschert J.A. Corcho Alvarado Rolf Kipfer Zheng‐Tian Lu Neil C. Sturchio

In the past decade aquifers have increasingly become palaeoclimatic archives in their own right alongside ice cores, sediments and other proxy records. The main tool for this task has been the noble gas palaeo-thermometer in combination with quantitative groundwater dating using radionuclides. Noblegas radionuclides play a unique role as tracers in environmental studies due to their chemical inertness and low concentration making them ideal tracers. The same properties on the other hand make them difficult to measure on natural concentration levels. Therefore for decades low level counting (LLC) was the only method for detecting radioisotopes of argon and krypton at an atmospheric level. In recent times and with the increase of interest and potential applications the analytical efforts with novel detection methods have been intensified. In the talk noble gas groundwater dating techniques over times scales from decades to millions of years are discussed in relation to noble gas palaeo records at different locations in Europe and elsewhere.

Noble gas

Ice core

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Serpentinization of the Acoje massif, Zambales ophiolite, Philippines: hydrogen and oxygen isotope geochemistry

Tectonophysics (1989)

Neil C. Sturchio Teofilo A. Abrajano James B. Murowchick Karlis Muehlenbachs

Chromite

Massif

Brucite

δ18O