...Christopher N. Smith; Stephen E. Kesler; Björn Klaue; Joel D. Blum Abstract The Hg isotopic compositions of samples throughout the vertical extent of two fossil hydrothermal systems were analyzed by multicollector inductively coupled plasma–mass spectrometry. Results show >5‰ (δ 202 Hg/ 198 Hg...

... time with lower Hg 202 /Hg 198 in the oceanic interior, allowing a slower removal of this element to the sediment. Another mechanism contributing to the relationship between Hg and the carbon cycle during glacial stages would have been increased phytoplankton productivity in the Subantarctic Zone...

... and NIST-3133. Hg has seven stable isotopes with the following abundances in NIST-3133 as determined by Blum and Bergquist (2007) : 196 Hg = 0.16%, 198 Hg = 10.04%, 199 Hg = 16.94%, 200 Hg = 23.14%, 201 Hg = 13.17%, 202 Hg = 29.73%, 204 Hg = 6.83%. The National Research Council of Canada reference...

... contribute to this task, given that Hg isotopes ( 196 Hg, 198 Hg – 202 Hg, and 204 Hg) display both mass-dependent fractionation (MDF, normally reported as δ 202 Hg) and mass-independent fractionation (MIF, normally reported as Δ 199 Hg), providing multi-dimensional information on Hg sources...

... (200.6 g/mol), and its seven stable isotopes span a relative mass difference of 4%. The abundances of its isotopes are as follows: 196 Hg (0.16%), 198 Hg (10.0%), 199 Hg (16.9%), 200 Hg (23.1%), 201 Hg (13.2%), 202 Hg (29.7%), 204 Hg (6.8%). Because Hg has active redox chemistry, forms covalent...

... 04 2022 © 2022 Geological Society of America 2022 Mercury (Hg) is a unique metal due to its high volatility, atmospheric transport, and active redox chemistry ( Selin, 2009 ). Mercury has seven stable isotopes ( 196 Hg, 198 Hg, 199 Hg, 200 Hg, 201 Hg, 202 Hg, and 204 Hg...

... squares) and Hg/Al (filled circles); and (D) Δ 199 Hg (red) and δ 202 Hg (green). Vertical purple rectangle in column D is the range of volcanic Δ 199 Hg (+0.02 ± 0.06‰; Yin et al., 2016 ). Horizonal gray rectangle represents the extinction interval (see the Data Repository [see footnote 1 ] for more...

... isotopes, which undergo mass-dependent fractionation (MDF; δ 202 Hg) and mass-independent fractionation (MIF; Δ 199 Hg), provide insights into the sources and biogeochemical cycling of Hg in the environment ( Blum et al., 2014 ; Grasby et al., 2017 ; Yin et al., 2022 ). Hg anomalies during the G–L...

... the 202 Hg/ 198 Hg ratio referenced to the NIST-3133 Hg standard, and the Δ notation was used for the difference between the measured δ xxx Hg and the theoretically predicted δ xxx Hg value, in units of per mil (‰): where β is 0.2520 for 199 Hg, 0.5024 for 200 Hg, and 0.7520 for 201 Hg. Analytical...

... are reported following the convention proposed by Bergquist and Blum (2007) . Specifically, mass-dependent fractionation is expressed in δ 202 Hg notation in units of ‰ referenced to the NIST-3133 Hg standard (analyzed before and after each sample): Mass-independent fractionation is reported in Δ...

... by mass-dependent mechanisms because the differences in zero-point vibrational energies that drive these reactions are smaller than in the lighter elements. As a result, natural isotopic fractionation in heavy elements is more limited than in the light elements. For example, 203 Tl/ 205 Tl and 202 Hg...

... metamorphism, the generated volatiles include reduced and oxidized species (CH 4 /CO/CO 2 , H 2 S/SO 2 , CH 3 Hg/Hg 0 ). In addition, both nitrogen- and halogen-bearing compounds, including CH 3 Cl, may form from organic matter, as mentioned above. E-mail: [email protected] Large igneous provinces...

... 137 GSD-1G Gd 0.005 157 GSD-1G Hf 0.01 178 GSD-1G Ta 0.01 181 GSD-1G W 0.02 182 STDGL2b2 Pt 0.05 195 STDGL2b2 + Au 0.05 197 STDGL2b2 + Hg 0.02 202 Tl 0.02 205 STDGL2b2 + Pb 0.02 206 STDGL2b2 + Pb 0.02 207 STDGL2b2 + Pb 0.02...

... signature in the marine geochemical sedimentary proxy record. Here, we compile new and existing mercury (Hg) concentration and osmium isotope ( 187 Os/ 188 Os) records for various stratigraphic sections worldwide. Both geochemical proxies have been suggested to reflect past variations in Deccan volcanic...

... [in Russian] , 198 – 202 , Irkutsk , 1998 . 10. Borisenko , A.S. , K.R. Kovalev , V.V. Babich , et al. , Mercurious gold of Salair and search for its root sources, in Prospecting of mineral deposits in Siberia . Proceedings of the Conference...

... ranges. Mercury is unusual in having 7 stable isotopes—Hg 196 , Hg 198 , Hg 199 , Hg 200 , Hg 201 , Hg 202 , and Hg 204 , spanning a relative mass difference of 4%. Consequently, mercury isotope systematics, both mass-dependent and mass-independent fractionations, hold great promise for tracking...

... been distinguished: gold-mercury and gold-silver (fahlore). It is typical of the gold-mercury deposits that Hg is present in fahlore (1.01–3.24 wt.%) and in native gold (1.52–5.64 wt.%). They also contain a gold-quartz-carbonate-fahlore paragenesis formed at relatively low temperatures (240–270 and 110...

...A.S. Borisenko; V.I. Sotnikov; A.E. Izokh; G.V. Polyakov; A.A. Obolensky A specific complex of different types of mineralization (early Cu-Ni-Pt and Ni-Co-As and late Hg, Au-Hg, and porphyry Cu-Mo) has been revealed in the areas of influence of the Siberian and Tarim mantle plumes. In some regions...

... core plugs were methanol-cleaned by the Soxhlet method before chopping off rock chips for measurements of MICP using a Poremaster PM 33-GT-12 instrument. The volume of intruded Hg was recorded at stepwise pressures up to 415 MPa. Intruded Hg volumes were converted to ϕ ′ inc ,Hg , and the d Hg...

... biological evolutionary crisis during the Late Ordovician Mass Extinction (LOME), we present high-resolution measurements of mercury (Hg) concentrations and organic carbon isotope ratios (δ 13 C org ) in an Ordovician–Silurian sedimentary succession (Muchanggou section). The results show that high-frequency...