Noble gas measurements in the L/LL5 chondrite Knyahinya

1997 ◽  
Vol 32 (1) ◽  
pp. 97-107 ◽  
Author(s):  
Bernard LAVIELLE ◽  
Seraphin TOÉ ◽  
ERIC GILABERT
Keyword(s):  
Noble Gas ◽  
Gas Measurements

Reproducibility and accuracy of noble gas measurements on water samples in the microlitre range

2013 ◽  
Vol 28 (1) ◽  
pp. 42-48
Author(s):  
Tim Sander ◽  
Thomas Marx ◽  
Jürgen Engel ◽  
Werner Aeschbach-Hertig
Keyword(s):  
Water Samples ◽  
Noble Gas ◽  
Gas Measurements

Low level noble gas measurements in the field and laboratory in support of the Comprehensive Nuclear-Test-Ban Treaty

2004 ◽  
Vol 61 (2-3) ◽  
pp. 231-235 ◽  
Author(s):  
Trevor J Stocki ◽  
Marc Bean ◽  
R Kurt Ungar ◽  
Harri Toivonen ◽  
Weihua Zhang ◽  
...  
Keyword(s):  
Noble Gas ◽  
Nuclear Test ◽  
Low Level ◽  
Gas Measurements ◽  
Test Ban ◽  
Nuclear Test Ban ◽  
Test Ban Treaty

scholarly journals Investigating Fracture Network Deformation Using Noble Gas Release

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
W. Payton Gardner ◽  
Stephen J. Bauer ◽  
Scott Broome
Keyword(s):  
Isotopic Composition ◽  
Noble Gas ◽  
Gas Release ◽  
Fracture Networks ◽  
Discrete Sampling ◽  
Well Completion ◽  
Before And After ◽  
Sampling Intervals ◽  
Deformation Mechanics ◽  
Gas Measurements

We investigate deformation mechanics of fracture networks in unsaturated fractured rocks from subsurface conventional detonation using dynamic noble gas measurements and changes in air permeability. We dynamically measured the noble gas isotopic composition and helium exhalation of downhole gas before and after a large subsurface conventional detonation. These noble gas measurements were combined with measurements of the subsurface permeability field from 64 discrete sampling intervals before and after the detonation and subsurface mapping of fractures in borehole walls before well completion. We saw no observable increase in radiogenic noble gas release from either an isotopic composition or a helium exhalation point of view. Large increases in permeability were observed in 13 of 64 discrete sampling intervals. Of the sampling intervals which saw large increases in flow, only two locations did not have preexisting fractures mapped at the site. Given the lack of noble gas release and a clear increase in permeability, we infer that most of the strain accommodation of the fractured media occurred along previously existing fractures, rather than the creation of new fractures, even for a high strain rate event. These results have significant implications for how we conceptualize the deformation of rocks with fracture networks above the percolation threshold, with application to a variety of geologic and geological engineering problems.

Using groundwater noble gas measurements to confirm paleorecharge hypotheses at Pahute Mesa, Nevada National Security Site, Nevada, USA

2022 ◽  
Author(s):  
Ate Visser ◽  
Edward Kwicklis ◽  
Irene Farnham ◽  
Andrew F. B. Tompson ◽  
Ronald L. Hershey
Keyword(s):  
National Security ◽  
Noble Gas ◽  
Gas Measurements

scholarly journals Reviewing Martian Atmospheric Noble Gas Measurements: From Martian Meteorites to Mars Missions

Geosciences ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 439
Author(s):  
Thomas Smith ◽  
P. M. Ranjith ◽  
Huaiyu He ◽  
Rixiang Zhu
Keyword(s):  
Noble Gases ◽  
Noble Gas ◽  
Atmospheric Composition ◽  
Geological Time ◽  
Chemical Inertness ◽  
Martian Meteorites ◽  
High Concern ◽  
Atmospheric Dynamic ◽  
Gas Measurements

Martian meteorites are the only samples from Mars available for extensive studies in laboratories on Earth. Among the various unresolved science questions, the question of the Martian atmospheric composition, distribution, and evolution over geological time still is of high concern for the scientific community. Recent successful space missions to Mars have particularly strengthened our understanding of the loss of the primary Martian atmosphere. Noble gases are commonly used in geochemistry and cosmochemistry as tools to better unravel the properties or exchange mechanisms associated with different isotopic reservoirs in the Earth or in different planetary bodies. The relatively low abundance and chemical inertness of noble gases enable their distributions and, consequently, transfer mechanisms to be determined. In this review, we first summarize the various in situ and laboratory techniques on Mars and in Martian meteorites, respectively, for measuring noble gas abundances and isotopic ratios. In the second part, we concentrate on the results obtained by both in situ and laboratory measurements, their complementarity, and the implications for the Martian atmospheric dynamic evolution through the last billions of years. Here, we intend on demonstrating how the various efforts established the Mars-Martian meteorites connection and its significance to our understanding of the red planet.

scholarly journals Using Noble Gas Measurements to Derive Air‐Sea Process Information and Predict Physical Gas Saturations

2017 ◽  
Vol 44 (19) ◽  
pp. 9901-9909 ◽  
Author(s):  
Roberta C. Hamme ◽  
Steven R. Emerson ◽  
Jeffrey P. Severinghaus ◽  
Matthew C. Long ◽  
Igor Yashayaev
Keyword(s):  
Noble Gas ◽  
Process Information ◽  
Gas Measurements

scholarly journals Evolution of mean ocean temperature in Marine Isotope Stages 5-4

2021 ◽  
Author(s):  
Sarah Shackleton ◽  
James A. Menking ◽  
Edward Brook ◽  
Christo Buizert ◽  
Michael N. Dyonisius ◽  
...  
Keyword(s):  
Noble Gas ◽  
Ice Sheet ◽  
Ocean Temperature ◽  
Atmospheric Conditions ◽  
Last Deglaciation ◽  
Glacial Cycle ◽  
The Last Deglaciation ◽  
Gas Measurements ◽  
Mis 5 ◽  
The Last Glacial

Abstract. Deglaciations are characterized by relatively fast and near-synchronous changes in ice sheet volume, ocean temperature, and atmospheric greenhouse gas concentrations, but glacial inceptions occur more gradually. Understanding the evolution of ice sheet, ocean, and atmospheric conditions from interglacial to glacial maximum provides important insight into the interplay of these components of our climate system. Using noble gas measurements in ancient ice samples, we reconstruct mean ocean temperature (MOT) from 74 to 59.5 ka BP, covering the Marine Isotope Stage (MIS) 5-4 boundary, MIS 4, and part of the MIS 4-3 transition. Comparing this MOT reconstruction to previously published MOT reconstructions from the last glacial cycle, we find that the majority of interglacial-glacial ocean cooling occurred across MIS 5, and MOT reached full glacial levels by MIS 4 (−2.7 ± 0.3 °C relative to the Holocene). Comparing MOT to contemporaneous records of CO2 and benthic 𝛿18O, we find that ocean cooling and the solubility pump can explain most of the CO2 drawdown and increase in 𝛿18O across MIS 5. The timing of ocean warming and cooling in our record indicates that millennial scale climate variability plays a crucial role in setting mean ocean temperature during this interval, as seen during other periods, such as the last deglaciation.

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