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Multiple sulfur isotope fractionations in inorganic aqueous systems
(2016)
New constraints on isotope fractionation factors in inorganic aqueous sulfur systems based on theoretical and experimental techniques relevant to studies of the sulfur cycle in modern environments and the geologic rock ...
Assessing the Oxidative History of Miller Range Martian Meteorites
(2016)
Miller Range (MIL) Martian meteorites are oxidized nakhlites. Early studies attribute their oxidation to reduction-oxidation reactions involving assimilated sulfate. I utilize the sulfur isotope and major element composition ...
Authigenesis, biomineralization, and carbon-sulfur cycling in the Ediacaran ocean
(2015)
Fossil record of the Ediacaran Period (635-541 Ma) reveals unprecedented rise of early animal life (metazoan) in Earth history. Coupled with this evolutionary milestone, the Earth’s atmosphere and hydrosphere experienced ...
Terrestrial Alteration of CM2 Chondritic Carbonates in a Suite of Paired Antarctic Meteorites.
(2005-06-01)
The δ18O, δ17O, δ13C, and δ14C compositions of carbonate grains were measured from paired Antarctic CM2 chondrites (EET96006, EET96016, EET96017, and EET96019). Oxygen isotopic compositions ...
Meter Scale Heterogeneities in the Oceanic Mantle Revealed in Ophiolite Peridotites
(2017)
The upper oceanic mantle is the largest accessible terrestrial geochemical reservoir. Numerous aspects of the upper oceanic mantle’s current state, as well as its chemical evolution through time, remain obscure. Although ...
Characterization of the regional, crustal, and global distribution and abundance of the heat producing elements and their geoneutrino flux
(2019)
The amount and distribution of radiogenic power generation from the heat producing elements (HPE) U, Th, and K in the Earth is not well constrained. Compositional estimates of these elements vary by a factor of three in ...
The Earth’s Thorium and Uranium Abundance and Distribution
(2018)
The abundance and distribution of thorium (Th) and uranium (U) in the Earth can provide important data for constraining its composition, heat budget, and processes of differentiation. This project seeks to constrain the ...
Origin of the anomalous sulfur isotope composition of the Rustenburg Layered Suite (Bushveld Complex), South Africa
(2019)
The 2.06 Ga Bushveld Magmatic Province (BMP) hosts the largest platinum group element (PGE) reserve of the world that occurs mainly as sulfide-rich layers within the Rustenburg Layered Suite (RLS), and also in mineralized ...
RE-OS AND OXYGEN SYSTEMATICS OF VARIABLY ALTERED ULTRAMAFIC ROCKS, NORTH CAROLINA
(2020)
This study focuses on the origin and modification of six ultramafic bodies located in the Blue Ridge Province of North Carolina. The bodies consist mainly of harzburgites and dunites with associated chromites. Some of the ...
SULFUR ISOTOPE CHARACTERIZATION OF MANTLE RESERVOIRS SAMPLED BY OCEAN ISLAND BASALTS
(2020)
Ocean islands are volcanic islands in the middle of oceans that are formed when magma deep inside the Earth buoyantly rises to the surface and erupts as basaltic lava (termed Ocean Island Basalt, OIB). Geochemical ...