... 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...

... , 3 mL of triple-distilled concentrated HCl, and appropriate amounts of mixed 185 Re− 190 Os and PGE ( 99 Ru, 105 Pd, 191 Ir, and 194 Pt) spikes were sealed in double internally cleaned, chilled 25 mL Pyrex™ borosilicate Carius tubes and heated to 270°C for 96 hours. Osmium was extracted from...

...Alan D. Rooney; Danny Hnatyshin; Jonathan Toma; Nicolas J. Saintilan; Alexie E.G. Millikin; David Selby; Robert A. Creaser Abstract The rhenium-osmium ( 187 Re- 187 Os) system is a highly versatile chronometer that is regularly applied to a wide range of geological and extraterrestrial materials...

... components, namely, platinum, osmium, sulfur, and copper, which are important indicators of magmatic and hydrothermal processes. In contrast to the Re–Os isotope system, the radiogenic Pt–Os isotope system, as well as stable isotopes of Cu and S in PGE deposits, are still relatively understudied. Our...

... tube then dissolved in HCl and HNO 3 at 250°C for 72 h. Osmium was extracted by the conventional CCl 4 method. Rhenium, Ir, Ru, Pt and Pd were the first subgroup separated from the matrix elements into Re–Ru, Ir–Pt and Pd by a 2 ml anion exchange column. Subsequently, Re–Ru was further purified...

... , M.F. , and Eldholm , O. , 1993 , Scratching the surface: Estimating dimensions of large igneous provinces : Geology , v. 21 , p. 515 – 518 . Cohen , A.S. , and Waters , G.G. , 1996 , Separation of osmium from geological materials by solvent extraction for analysis by thermal...

... for sedimentary mercury (Hg) and osmium (Os) to assess the impact of subaerial and submarine volcanism and weathering during the late Cambrian and early Ordovician. Data from the Alum Shale Formation (Sweden) cover the Steptoean positive carbon-isotope excursion (SPICE; ca. 497–494 Ma), a period marked by marine...

... sediments are also inferred as a Re source in modern volcanic fumaroles in arcs through recycling ( Tessalina et al., 2008 ; Liao et al., 2019 ). Osmium is released from oceanic crust and recycled into the mantle wedge during slab dehydration and/or melting, as evidenced from forearc and subarc...

.... 2a , 3b ). The characteristic cavities reflect the shapes of missing grains (likely chromite) lost in the placer environment. In the River Ko placers, the mineral osmium predominates ( Fig. 6 ). Growth zones that are Ir-dominant or relatively enriched in Ir tend to occur at the rim ( Fig. 2b...

... harzburgites share similarities with strongly melt depleted abyssal peridotites, or forearc peridotites ( Fig. 3 ). Figure 3. (A) Osmium vs. 187 Os/ 188 Os for Simcoe mantle xenoliths from this study and Brandon et al. (1996 , 1999 ) compared with abyssal peridotites ( Paquet et al., 2022 ), Pacific...

... and global warming, causing oceanic oxygen depletion, the Weissert Event featured climate cooling and limited marine anoxia. Here, the impact of silicate weathering on environmental change during the Weissert Event is investigated by presenting the first osmium isotope ( 187 Os/ 188 Os) data sets...

... into the origin of a complex Cu–Pt alloy grain (average composition ~Cu 4 Pt). The grain hosts Fe-, Ni-, and Pt-rich sub-grains associated with Rh, variably overlapping networks of Pd- and Cd-enrichment, and OH-rich volumes identified as fluid inclusions. Osmium and Ru are hosted by an idioblastic laurite (RuS 2...

... grains, such as laurite–erlichmanite solid-solution minerals, osmium (Os), bowieite (Rh 2 S 3 ), kingstonite (Rh 3 S 4 ), miassite (Rh 17 S 15 ), cherepanovite (RhAs), hollingworthite (RhAsS), cuprorhodsite [(Cu,Fe)Rh 2 S 4 ] and irarsite (IrAsS) (Nishio-Hamane et al. , 2019 ). Grains with laurite...

...) . The rhenium-osmium (Re-Os) isotopic system is a unique geochemical tool for tracing the source of ore metals in magmatic-hydrothermal systems (e.g., Mathur et al., 2000 ; Morelli et al., 2007 ; Saintilan et al., 2021 ). Whereas Os is a compatible element during partial melting of the mantle, Re behaves...

.... , Chen , L.H. , and Li , S.G. , 2021 , Oxidation of the deep big mantle wedge by recycled carbonates: Constraints from highly siderophile elements and osmium isotopes : Geochimica et Cosmochimica Acta , v. 295 , p. 207 – 223 , https://doi.org/10.1016/j.gca.2020.12.019 . Canil , D...

... turnover. We provide a new rhenium-osmium (Re-Os) sedimentary rock age constraint from the Furongian Alum Shale Formation, Sweden, in an effort to strengthen intercontinental correlation schemes and refine the Cambrian time scale. Additionally, we couple global weathering proxy data (Os isotopes) and local...

... chemostratigraphy time-calibrated by the Tambien Group of Ethiopia : Geological Society of America Bulletin , v. 132 , p. 1119 – 1149 , https://doi.org/10.1130/B35178.1 . Peucker-Ehrenbrink , B. , and Ravizza , G. , 2002 , The marine osmium isotope record : Terra Nova , v. 12 , p. 205 – 219...

.... Although the biota provides remarkable insights into the early evolution of complex macroeukaryotes in the Ediacaran, the uncertainty in its age has hampered any robust biological evaluation. We resolve this issue by applying a petrographic-guided rhenium-osmium (Re-Os) organic-bearing sedimentary unit...

... geologic process. However, age control in most sedimentary Mn deposits is often hampered by the lack of reliable biostratigraphic constraints and/or the absence of tuff horizons suitable for zircon U-Pb dating, making the direct dating of these deposits a challenge. Rhenium-osmium geochronology has...