Development of in situ sulfur four-isotope analysis withmultiple Faraday cup detectors by SIMS and application to pyrite grains in a Paleoproterozoic glaciogenic sandstone

High-precision SIMS oxygen, sulfur and iron stable isotope analyses of geological materials: accuracy, surface topography and crystal orientation

A high-precision SIMS analysis technique has been established for oxygen, sulfur, and iron isotope ratios and applied to a wide range of geoscience research areas using a Cameca IMS-1280 at the Wisconsin Secondary Ion Mass Spectrometer Laboratory (WiscSIMS). Precision and accuracy of 0.3‰ is achieved routinely for the measurement of 18O/16O ratio using multicollection Faraday Cup (FC) detectors...

High precision SIMS oxygen isotope analysis and the effect of sample topography

a r t i c l e i n f o Keywords: Secondary ion mass spectrometer Isotope ratios Oxygen High precision Instrumental bias We have developed highly precise and accurate in situ SIMS stable isotope analytical protocols using the IMS-1280 at the University of Wisconsin, through careful tuning of the instrument, stable electronics, and improved protocols for sample preparation, standardization and aut...

Multiple sulfur isotopes of sulfides from sediments in the aftermath of Paleoproterozoic glaciations

Geochemical evidence reported from Paleoproterozoic sediments has long been used to evaluate the transition from the anoxic Archean atmosphere to an oxygenated atmosphere. Sulfur isotopes (S, S, S and S) in sedimentary sulfides and sulfates are an especially sensitive means to monitor this transition, such that the timing of the Paleoproterozoic “Great Oxidation Event” can be investigated using...

Pyrite multiple-sulfur isotope evidence for rapid expansion and contraction of the early Paleoproterozoic seawater sulfate reservoir

Hydrothermal evolution of the Sar-Kuh porphyry copper deposit, Kerman, Iran: A fluid inclusion and sulfur isotope investigation

Sar-Kuh porphyry copper deposit is located 6 km southwest of the Sar-Cheshmeh copper mine, Kerman Province, Iran. Based on field geology, petrography and fluid inclusions studies, four alteration types have been identified in the Sar-Kuh area. Early hydrothermal alteration formed a potassic zone in the central parts of Mamzar granite/grano-diorite stock and propylitic alteration in its peripher...