Earth Sciences Commons^™

Scratching The Surface Of The Isotope Landscape Of An Ore Deposit Molybdenum-Sulfur Isotope Relationships In A Porphyry Copper-Molybdenum Deposit (Santa Rita / Chino Mine, Nm), Joshua Roger Peterson

Open Access Theses & Dissertations

More than 95% of the world's molybdenum (Mo) is mined from porphyry deposits (Sinclair, 2007). Molybdenum is an important component for the metal industry, as a key ingredient in stainless steel alloys and high-speed heat resistant tools. Despite the importance of porphyry deposits for the supply of this industrially important metal, major questions about Mo mineral precipitation remain unresolved and the process of ore body emplacement and formation remains poorly investigated (Cooke et al., 2014a).

Recent observations have revealed a wide range of Mo isotope compositions in porphyry deposits, both globally and locally (Greber et al., 2014a; Shafiei et al., …

Precipitation And Transformation Of Iron-Sulfide Nanoparticles In Low-Temperature Aqueous Environment: Effects Of Reactant Iron And Sulfide Sources, Ezequiel A. Moreno Flores

Open Access Theses & Dissertations

Iron sulfide nanoparticles assume an important role within a wide range of geological settings as indicators of redox environmental conditions and elemental cycling mechanisms. Initial precipitates of iron sulfide are exclusively nanoscale sized in low temperature aqueous conditions and have been reported to go through diverse morphological and phase transformations, possibly leading to the ultimate deposits of pyrite in geologic records of various times. A systematic understanding of how the early-stage nanoparticles of iron sulfide may develop into more crystalline iron sulfide forms is still lacking however. The major goal for this study was to illuminate the effects of the …

Ductile Deformation In The Central Panamint Mountains - A Multi-Disciplinary Approach To A Multi-Dimensional Problem., Tai Antonia Subia

Open Access Theses & Dissertations

This study provides new insights into the geometry and timing of ductile, syn-metamorphic structures in the central Panamint Mountains of eastern California. The study focused on Surprise Canyon, where exposures of Meso- to Neoproterozoic miogeocline rocks, reworked crystalline basement, and syn-metamorphic granitoids record fabric overprints indicative of at least two distinct dynamo-thermal metamorphic events. Prograde metamorphism at greenschist and amphibolite metamorphic facies conditions occurred during Early Jurassic plutonism based on deformation of a dioritic pluton with a U-Pb date reported here of 175.6 ± 3.2 Ma. Mid Jurassic deformation (D1) generated the main continuous cleavage in the rocks (S1) as …