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Mo-98/Mo-95

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Journal Article
Published: 01 October 2018
Italian Journal of Geosciences (2018) 137 (3): 465-477.
... of subduction-related, sediment-derived metasomatism on Molybdenum and Uranium isotopes. This paper reports the first 98 Mo/ 95 Mo and 238 U/ 235 U data on potassic and ultrapotassic rocks at destructive plate margins. Both 98 Mo/ 95 Mo and 238 U/ 235 U ratios show large variations in the samples from Western...
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Journal Article
Journal: Economic Geology
Published: 01 August 2019
Economic Geology (2019) 114 (5): 981-992.
..., and utilizing the δ 98/95 Mo of marine sediments as a paleoredox proxy. Using the well-characterized Qulong porphyry Cu-Mo deposit (Tibet) as an example, here we discuss how rapid cooling, facilitated by mixing hot magmatic fluid with cold meteoric water, can be a controlling factor on efficient mineralization...
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Journal Article
Journal: Geology
Published: 01 August 2006
Geology (2006) 34 (8): 617-620.
... that there are unique environmentally dependent Mo isotope signatures recorded in marine sediments that reflect the mechanisms responsible for authigenic Mo accumulation. Open-ocean anoxic sites, defined as having dissolved oxygen and sulfide concentrations near zero in the overlying water, exhibit a δ 98/95 Mo isotope...
FIGURES
Journal Article
Journal: Geology
Published: 01 June 2009
Geology (2009) 37 (6): 535-538.
... record the isotopic composition of contemporaneous seawater. Comparison of δ 98/95 Mo in two Devonian shale sequences of similar age, the New York Oatka Creek and Geneseo Formations, reveals that this assumption cannot be applied to all organic-rich shales. Although both sequences contain laminated...
FIGURES
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- <b>Mo</b> isotope composition δ <b>98</b>&#x2F;<b>95</b> <b>Mo</b> vs. Ce&#x2F;<b>Mo</b> (log-scale) of Western Alps s...
Published: 01 October 2018
Fig. 3 - Mo isotope composition δ 98/95 Mo vs. Ce/Mo (log-scale) of Western Alps samples in comparison with Mariana arc and Lesser Antilles lavas ( F reymuth et alii , 2015 ; 2016). MORB average is represented by the red symbol, with Ce/Mo from the compilation of G ale et alii (2013) and δ
Journal Article
Journal: Geology
Published: 01 December 2016
Geology (2016) 44 (12): 987-990.
... shales, present in the subducting sediment piles, are highly enriched in Mo and have unusually high 98 Mo/ 95 Mo. Despite their low mass fraction in the sediment package (<10% in Deep Sea Drilling Project Site 144), they dominate the Mo content and isotopic composition of the bulk sediment subducting...
Image
Figure 1. Total organic carbon (TOC), δ 13 C org , δ <b>98</b>&#x2F;<b>95</b> <b>Mo</b>, [<b>Mo</b>], and Re...
in > Geology
Published: 01 March 2008
Figure 1. Total organic carbon (TOC), δ 13 C org , δ 98/95 Mo, [Mo], and Re/Mo data from the lower Toarcian sedimentary rocks exposed in Yorkshire, UK. Ammonite biostratigraphy, bed numbers, and δ 13 C org data are from Cohen et al. (2004) and Kemp et al. (2005) and references therein; present
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Maximum molybdenum isotope variations of molybdenite (Δ <b>98</b>&#x2F;<b>95</b> <b>Mo</b> molybdenit...
Published: 01 August 2019
Fig. 8. Maximum molybdenum isotope variations of molybdenite (Δ 98/95 Mo molybdenite ) that could be generated as a function of mineralization efficiency and temperature. For a given fluid, δ 98/95 Mo of molybdenite grains crystalized from that fluid could be predicted using a simple Rayleigh
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- Various trace element ratios and δ <b>98</b>&#x2F;<b>95</b> <b>Mo</b> vs. ( 234 U&#x2F; 238 U) activity ...
Published: 01 October 2018
Fig. 6 - Various trace element ratios and δ 98/95 Mo vs. ( 234 U/ 238 U) activity ratio to investigate the role of superficial weathering. Parentheses denote the ratio id expressed as activity. Error bars for δ 98/95 Mo are smaller than the size of the symbols.
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Plot of  δ  <b>98</b>&#x2F;<b>95</b> <b>Mo</b> data (SRM—standard reference material) for Buchanan La...
in > Geology
Published: 01 September 2013
Figure 3. Plot of δ 98/95 Mo data (SRM—standard reference material) for Buchanan Lake and West Blind Fiord (Canadian Arctic) at same temporal scale. Color bands represent ranges of δ 98/95 Mo values indicative for transition from oxic to euxinic conditions as previously defined ( Poulson
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Two formations have different fields on δ <b>98</b>&#x2F;<b>95</b> <b>Mo</b> vs. Fe T &#x2F;Al and degrees...
in > Geology
Published: 01 June 2009
Figure 2. Two formations have different fields on δ 98/95 Mo vs. Fe T /Al and degrees of pyritization (DOP) ratios. Data are reported relative to our in-house standard (Johnson Matthey Chemical, Specpure lot 702499I); on this scale, modern seawater has value of 2.34‰ ± 0.20‰ (2 standard deviation
Journal Article
Journal: Geology
Published: 01 September 2013
Geology (2013) 41 (9): 967-970.
...Figure 3. Plot of δ 98/95 Mo data (SRM—standard reference material) for Buchanan Lake and West Blind Fiord (Canadian Arctic) at same temporal scale. Color bands represent ranges of δ 98/95 Mo values indicative for transition from oxic to euxinic conditions as previously defined ( Poulson...
FIGURES
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Sketch illustrates that the heterogeneous <b>Mo</b> isotope composition at grain s...
Published: 01 August 2019
Fig. 6. Sketch illustrates that the heterogeneous Mo isotope composition at grain scale was controlled by Rayleigh fractionation. For fractures occupied by ore-forming fluid with a given δ 98/95 Mo, molybdenite grains that crystallized first will have the lightest δ 98/95 Mo, while molybdenite
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Qualitative patterns of <b>Mo</b> isotope composition in an evolving system. A) Fo...
Published: 01 August 2019
a similar increasing δ 98/95 Mo trend below that of the residual fluid. B) For a system undergoing multiple episodes of fluid boiling, preferential enrichment of isotopically heavy Mo in the vapor phase will result in a progressive decrease in the δ 98/95 Mo pattern for the residual liquid phase
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Figure 3. Relationships between [<b>Mo</b>] and total organic carbon (TOC) (A), an...
in > Geology
Published: 01 March 2008
Figure 3. Relationships between [Mo] and total organic carbon (TOC) (A), and between δ 98/95 Mo and 1/[Mo] (B), used to resolve changes in the areal extent of marine anoxia during the Toarcian. Distinct grouping of samples reflects the four geochemically constrained stratigraphic intervals shown
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Time-resolved <b>Mo</b> isotope composition evolution of the three mineralization ...
Published: 01 August 2019
display decreasing δ 98/95 Mo through time, while the second mineralization pulse is characterized by an increasing δ 98/95 Mo trend, except for two veins that fall off this trend with higher values. The third mineralization pulse has relatively invariant δ 98/95 Mo.
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Figure 2. Details of geochemical changes in the upper  Dactylioceras semice...
in > Geology
Published: 01 March 2008
by dashed gray lines. The four excursions in δ 98/95 Mo are labeled I–IV and the intervals of decreasing δ 98/95 Mo, representing the development of global marine anoxia, are highlighted in gray. Uncertainties on δ 98/95 Mo values represent 2 standard error for each measurement.
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A, B) The effects of variable digestion masses on <b>Mo</b> isotope composition. T...
Published: 01 August 2019
, reproducible δ 98/95 Mo values were not obtained until the digestion masses were >5 mg (i.e., >20 grains). In contrast, the δ 98/95 Mo values of the coarse-grained (2 mm) sample 1605-80/6-7 were reproducible regardless of digestion mass. The dashed blue lines represent the recommended δ 98/95 Mo
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Summary of existing <b>Mo</b> isotope data from natural samples. Isotopic composit...
Published: 01 January 2004
Figure 6. Summary of existing Mo isotope data from natural samples. Isotopic composition of ocean source is based on mass balance (see text). Data are presented as δ 97/95 Mo and δ 98/95 Mo relative to the Rochester JMC standard (δ 97/95 Mo ~2/3 × δ 98/95 Mo). References: (*) McManus et al
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A simplified oceanic budget for <b>Mo</b> and its isotopes, showing the main input...
in > Elements
Published: 01 December 2018
moles y −1 and the isotopic composition of that flux, respectively. The δ 98 Mo is the 98 Mo/ 95 Mo ratio as expressed relative to a value of +0.25‰ for the molybdenum standard solution that is National Institute of Standards and Technology (NIST) Standard Reference Material (SRM) 3134. A fter K