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2. Comparison of chemical procedures for Re-isotopic measurements by N-TIMS

Author

Nicole C. Hurtig, Aaron Zimmerman, Vineet Goswami, Svetoslav V. Georgiev, Gang Yang, Judith L. Hannah, and Holly J. Stein

Subjects
Reproducibility, 010504 meteorology & atmospheric sciences, Extraction (chemistry), Analytical chemistry, chemistry.chemical_element, Geology, Rhenium, Standard solution, 010502 geochemistry & geophysics, 01 natural sciences, Isotopic composition, chemistry, Geochemistry and Petrology, Yield (chemistry), Geochronology, Ion-exchange resin, 0105 earth and related environmental sciences
Abstract

Precise and accurate measurements of the isotopic composition of rhenium (Re) in geologic samples are of paramount importance for the successful application of the Re-Os geochronometer. Two methods for chemical isolation of Re are used in the geochronology community – column chemistry using anion exchange resin and solvent-solvent extraction using a sodium hydroxide-acetone mixture. Despite their ubiquitous application, a systematic comparison of these two methods is missing. Here we compare Re-isotopic data on a variety of samples (sulfides, hydrocarbons, shales, and in-house standard solutions) that were processed by both chemical methods. Measured 185Re/187Re ratios for both methods have similar precision and overlap within the propagated long-term analytical reproducibility of ~1‰ for samples that yield moderate to strong intensities (>50 mV on the weaker Re mass). In contrast, measured 185Re/187Re ratios for most samples that yield less intense Re signals (

Published
2018
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3. Time evolution of a rifted continental arc: Integrated ID-TIMS and LA-ICPMS study of magmatic zircons from the Eastern Srednogorie, Bulgaria

Author

Peter Marchev, Svetoslav V. Georgiev, A. von Quadt, Irena Peytcheva, and Christoph A. Heinrich

Subjects
U–Pb zircon ages, ID-TIMS, LA‐ICPMS, Eastern Srednogorie arc, Geodynamic evolution, geography, geography.geographical_feature_category, Rift, 010504 meteorology & atmospheric sciences, Mantle wedge, Geochemistry, Metamorphism, Geology, 010502 geochemistry & geophysics, 01 natural sciences, Continental arc, Volcanic rock, Basement (geology), Geochemistry and Petrology, Geochronology, Magmatism, 0105 earth and related environmental sciences
Abstract

Lithos, 154, ISSN:0024-4937

Published
2012
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5. Origin of Nepheline-normative High-K Ankaramites and the Evolution of Eastern Srednogorie Arc in Southeastern Europe

Author

Peter Marchev, A. von Quadt, Irena Peytcheva, Svetoslav V. Georgiev, Piero Manetti, and Christoph A. Heinrich

Subjects
Basalt, geography, primitive magmas, geography.geographical_feature_category, Pluton, source components, Partial melting, Geochemistry, Massif, ankaramites, Eastern Srednogorie arc, geochemistry, Geophysics, Geochemistry and Petrology, Ultramafic rock, Geology, Amphibole, Petrogenesis, Melt inclusions
Abstract

Journal of Petrology, 50 (10), ISSN:0022-3530, ISSN:1460-2415

Published
2009

6. High-K ankaramitic melt inclusions and lavas in the Upper Cretaceous Eastern Srednogorie continental arc, Bulgaria: Implications for the genesis of arc shoshonites

Author

Svetoslav V. Georgiev, Zoltán Zajacz, Piero Manetti, Peter Marchev, Raya Raicheva, Albrecht von Quadt, and Simone Tommasini

Subjects
Basalt, Olivine, Geochemistry, Geology, engineering.material, Continental arc, Geochemistry and Petrology, Magmatism, engineering, Phenocryst, Mafic, Primitive mantle, Petrology, Melt inclusions
Abstract

The Upper Cretaceous Yambol–Burgas region of the Eastern Srednogorie continental arc is characterized by unusually large volumes of mafic shoshonitic and ultra-K magmatism represented by high-Mg cumulitic rocks, and nepheline-normative ankaramites, absarokites and shoshonitic (high-alumina) basalts. The cumulitic rocks consist of phenocrysts of clinopyroxene and olivine (Fo91–85) with inclusions of spinel (Cr#75–78). Olivine high-Fo cores and clinopyroxene host glassy melt inclusions which have nepheline-normative compositions with ankaramitic CaO/Al2O3 ratios (> 1), low SiO2 (47.4–50.0 wt.%), high MgO (7.5–10.8 wt.%), high total alkalis and shoshonitic K2O/Na2O ratios (> 1). Electron microprobe and LA-ICPMS analyses demonstrate that parental magma was a high-Ca primitive mantle melt. Melt inclusions from the less Fo85 rim approach absarokite composition with CaO/Al2O3 ratios

Published
2009

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