10th Applied Isotope Geochemistry Conference

Abstract

In the current work a new method to extract and analyse pore water d 2 H and d 18O from drill core samples via H 2 O (liquid) -H 2 O (vapour) equilibrium laser spectroscopy is presented. The method combines a H 2 O (liquid) -H 2 O (vapour) equilibrium cell with a Los Gatos Research (LGR) cavity ring down mass spectrometer (CRDS) and follows and adaption of the original method presented by Wassenaar et al. (2008). Sediment and rock samples taken from a research site in New South Wales, Australia were first equilibrated in a fixed volume of dehumidified air and then directly sampled by the LGR mass spectrometer. Results provide clear evidence that the technique is repeatable and can be conducted on geologic media that contain volumetric water content as low as 5%, with H 2 O (liquid) -H 2 O (vapour) equilibrium occurring over time periods as short as 120 minutes. The faster sample analysis time and lower associated consumable and instrumentation costs of the method compared to conventional techniques for pore water extraction (centrifugation, squeezing, installation of monitoring bores, etc.) and analysis therefore presents great potential for field deployment, enabling hydrogeological profiling without the need to remove drill core samples from site. (vapour) equilibrium laser spectroscopy. Environ. Sci. Technol., 42, pp. 9262-9267, 2008. 1788-2281/$20.00 © 2013 Akadémiai Kiadó, Budapest Central European Geology, Vol. 56/2-3, pp. 1-280 (2013 DOI: 10.1556/CEuGeol.56.2013 -ORIGIN OF NATURAL GAS-FED "ETERNAL FLAMES" IN THE NORTHERN APPALACHIAN BASIN, USAArndt Schimmelmann 1 -Giuseppe Etiope 2 -Agnieszka Drobniak 3 1 Department of Geological Sciences, Indiana University, Bloomington, Indiana, USA; e-mail: aschimme@indiana.edu 2 Istituto Nazionale di Geofisica e Vulcanologia, Roma, Italy, and Faculty of Environmental Science and Engineering, Babes-Bolyai University, Cluj-Napoca, Romania 3 Indiana Geological Survey, Indiana University, Bloomington, Indiana, USA Natural hydrocarbon gas seeps are surface expressions of petroleum seepage systems, where gas ascends through faults and conduits from pressurized reservoirs that are typically associated with conventional reservoirs in sandstones or limestones. These rare natural gas seeps provide opportunities for direct sampling of gas from subsurface hydrocarbon accumulations without the need for drilling or other costly means of petroleum exploration.We have documented a site in the northern Appalachian Basin, at Chestnut Ridge County Park, New York (Fig. 1, left), where gas seepage has supported a spectacular "eternal flame" throughout available recorded history, and which may have burnt naturally for many hundreds or even thousands of years. This remarkable flame marks a natural gas macroseep of dominantly thermogenic origin. Gas emanates directly from deep shale source rocks, probably the Rhinestreet Shale of the Upper Devonian West Falls Group, which makes this a rare case in contrast to most petroleum seepage systems where gas derives from conventional reservo...

Isoscape of amount-weighted annual mean precipitation tritium (<sup>3</sup>H) activity from 1976 to 2017 for the Adriatic–Pannonian region – AP<sup>3</sup>H_v1 database

“…These isoscapes (Kern et al, 2019) can serve as a reference dataset for studies on infiltration dynamics, water transport through various compartments of the hydrological cycle, mixing processes, and run-off modeling, for example, to estimate mean residence time in surface waters and groundwater (Kanduč et al, 2014;Ozyurt et al, 2014;Szucs et al, 2015). As a specific type of hydrogeological application, the regional model of 3 H time series will serve as a benchmark in estimating the mean infiltration age of drip water (Kluge et al, 2010), which can provide an additional tool for ongoing cave monitoring studies from the region (e.g Czuppon et al, 2018Czuppon et al, , 2013Fehér et al, 2016;Surić et al, 2010) in a spatiotemporally accurate way.…”

“…There are several methods to reconstruct precipitation tritium time series for geographical locations (Li et al, 2019). The prediction of the first global model for tritium distribution in precipitation from 1960 to 1986 (Doney et al, 1992) was improved and provided a higher-accuracy estimate for precipitation 3 H variations (Zhang et al, 2011) extending up to 2005 called the "modified global model of tritium in precipitation" (MGMTP). Unfortunately, the key parameters of the MGMTP are only available as isoline maps (Zhang et al, 2011), from which the model's coefficients can be extracted with high uncertainty in a manual way, which leads them to be ambiguous.…”