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Journal Article
Journal: GSA Bulletin
Published: 30 April 2018
GSA Bulletin (2018) 130 (9-10): 1697-1722.
...; detection limit 0.1 ppmv) by using two Fisons 8000-series Bench gas chromatographs. Helium (He) was also analyzed for these samples using a mass spectrometer (Varian Leak Detector; 10–4 atm cc/sec to 4 × 10–8 atm cc/sec). The statistical analysis of CO 2 and O 2 between the field and laboratory...
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Journal Article
Journal: Lithosphere
Published: 23 March 2018
Lithosphere (2018) 10 (3): 406-425.
... of the cooling history from seven different field sites across the western Scottish Highlands using radiogenic apatite helium thermochronometry ([U-Th]/He; n = 14; ca. 31–363 Ma) and thermal modeling confirm that post-Caledonian heating and burial, as well as cooling and exhumation, must have been variable...
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Journal Article
Published: 01 February 2018
Italian Journal of Geosciences (2018) 137 (1): 62-72.
... chromatograph equipped with a TCD detector using He as carrier gas. The partial pressure of each gas species (CO 2 , N 2 , O 2 , Ar) was determined with reference to standards at different pressure. Helium partial pressures were determined by a leak detector (detection limit 0.00015 mbar) in a separate sample...
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Journal Article
Journal: Geology
Published: 23 August 2017
Geology (2017) 45 (11): 995-998.
... , C.J. , 2006 , Seawater subduction controls the heavy noble gas composition of the mantle : Nature , v. 441 , p. 186 – 191 , doi:10.1038/nature04761. Jenden , P.D. , Hilton , D.R. , Kaplan , I.R. , and Craig , H. , 1993 , Abiogenic hydrocarbons and mantle helium in oil...
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Journal Article
Journal: Geology
Published: 10 July 2017
Geology (2017) 45 (9): 827-830.
... Repository material. This study has shown that the basaltic magmas making up the Paraná-Etendeka CFBs were at least partly derived from a deep-seated upwelling mantle plume. A clear plume signature is preserved in olivine-rich dikes that have helium isotope ratios (>26 R A ) greater than those measured...
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Journal Article
Journal: Geology
Published: 29 June 2017
Geology (2017) 45 (9): 775-778.
... volume estimates (i.e., gas to water volume ratios) match closed-system noble gas model predictions, suggesting that the Rotliegend system has remained isolated as a closed system since hydrocarbon formation. Radiogenic helium data show that fluid isolation occurred 63–129 m.y. after rock...
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Journal Article
Journal: GSA Bulletin
Published: 01 March 2017
GSA Bulletin (2017) 129 (3-4): 304-317.
.... , and MacLean , N.J. , 2011 , Assessing the link between mantle source and sub-volcanic plumbing in the petrology of basalts from the 2001 and 2002/2003 eruptions of Mount Etna, Sicily: Evidence from geochemical and helium isotope data : Lithos , v. 123 , p. 254 – 261 , doi:10.1016/j.lithos.2010.11.013...
Journal Article
Journal: Economic Geology
Published: 01 December 2016
Economic Geology (2016) 111 (8): 1985-2016.
... in the extracts from these iron minerals were derived from a magmatic source. A striking aspect of the noble gas data is that He/Ne and He/Ar ratios are more than three orders of magnitude greater than those of air ( Fig. 17A ), which indicates that there is little or no atmospheric helium present in the samples...
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Journal Article
Journal: Geosphere
Published: 01 December 2016
Geosphere (2016) 12 (6): 1670-1700.
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