RARE EARTH ELEMENTS AND STABLE ISOTOPES IN VEIN-FILLING CARBONATE CEMENTS FROM THE ORDOVICIAN VININI TYPE-SECTION IN CENTRAL NEVADA: INDICATORS OF DIAGENESIS
The objective of this research is to observe REE changes across vein-filling carbonate cements to determine whether discrete cement layers represent individual fluid events. Rare earth elements are used as the chemical indicator because they are non-reactive and their signature can help determine fluid provenance. Oxygen isotopes are used to determine the temperature of the parent fluid(s) that precipitated the vein-filling cements.
Rare earth elements will be determined using electron microprobe (EMP) and laser ablation inductively coupled plasma-mass spectrometry (LA-ICP-MS). Oxygen isotopes will be analyzed using isotope mass spectrometry (MS). It is anticipated, based on tectonic history, petrographic and geochemical analyses, that the characteristics of these vein-filling cements will indicate a meteoric origin for the parent fluid(s).