Now showing items 1-9 of 9
Highly Siderophile Elements and the Rhenium-Osmium System in Chondritic Components
Chondritic meteorites and their components provide information about the early solar system, as well as processes that affected meteorite parent bodies post-accretion. The rare earth element (REE) abundances, highly ...
Tracing Continental Weathering Using Lithium and Magnesium Isotopes
Chemical weathering is an important mechanism that changes the mass and composition of the continental crust and regulates the global CO<sub>2</sub> cycle over geological time scales. Basalt, in particular, is the main ...
The Effect of CO2 on Copper Partitioning in Sulfur- Free and Sulfur-Bearing Felsic Melt-Vapor-Brine Assemblages
Analysis of fluid inclusions from porphyry copper deposits (PCD) reveals that magmatic vapor and/or brine are vital for the removal of copper from arc magmas and its transport to the site of ore formation. Experiments in ...
A Study of the Sulfur Isotopic Composition of Martian Meteorites
ABSTRACT Title of Document: A STUDY OF THE SULFUR ISOTOPIC COMPOSITION OF MARTIAN METEORITES Heather B. Franz, Ph.D., 2012 Directed By: Professor James Farquhar, Department of Geology and ESSIC Sulfur is an ...
TRACING RETROGRADE METAMORPHIC FLUIDS IN A SUBDUCTION ZONE USING LI: FRANCISCAN COMPLEX, CALIFORNIA
Centimeter-scale layers of eclogite and blueschist from Tiburon Peninsula, Franciscan Complex, CA were contrasted with a similarly layered sample from Dos Rios, CA. Eclogites from both localities have similar mineral ...
Geomorphic, hydraulic, and biogeochemical controls on nitrate retention in tidal freshwater marshes
Tidal freshwater wetlands are ideal sites for nitrate retention because of their position within the landscape (near the head of tide); they receive water, discharge, nutrients (N and P), and sediment loads directly from ...
ISOTOPE GEOCHEMISTRY OF ORGANIC SULFUR COMPOUNDS WITH LINKS TO BIOGEOCHEMICAL SULFUR CYCLING AND RADICAL CHEMISTRY
An Integrated Isotopic and Biomarker Analysis of the Glaciogenic Vazante Group, Brazil
The Vazante Group, a meta-sedimentary succession located in south-central Brazil, contains several intervals of diamictite, interpreted as glacial in origin, bracketed by well-preserved carbonate and shale. This glacial ...
Geochemical and Radiometric Constraints on the Redox History of Late Ediacaran Oceans
Over the past decade, significant field and laboratory studies have been devoted to furthering understanding of the chemical conditions that accompanied the origin and diversification of Earth's earliest multicellular ...