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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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West Africa
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Ivory Coast (1)
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Atlantic Ocean
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North Atlantic (1)
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Australasia (1)
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North America (2)
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United States
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Georgia (1)
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Texas (1)
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commodities
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glass materials (3)
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elements, isotopes
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carbon (1)
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chemical ratios (1)
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hydrogen (1)
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metals
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alkali metals
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potassium (2)
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sodium (1)
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iron
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ferric iron (6)
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ferrous iron (4)
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rare earths
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europium (1)
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oxygen (3)
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sulfur (2)
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igneous rocks
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igneous rocks
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volcanic rocks
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glasses (5)
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phonolites (2)
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metamorphic rocks
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metamorphic rocks
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impactites (2)
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mylonites
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pseudotachylite (1)
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minerals
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phosphates (1)
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silicates
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aluminosilicates (2)
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orthosilicates
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nesosilicates
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garnet group (1)
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sheet silicates
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mica group (1)
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sulfates (1)
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sulfides (1)
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Primary terms
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Africa
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West Africa
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Ivory Coast (1)
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Atlantic Ocean
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North Atlantic (1)
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Australasia (1)
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carbon (1)
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crystal structure (2)
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Deep Sea Drilling Project
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IPOD
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Leg 95
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DSDP Site 612 (1)
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Earth (1)
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faults (1)
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geochemistry (1)
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hydrogen (1)
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igneous rocks
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volcanic rocks
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glasses (5)
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phonolites (2)
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magmas (3)
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metals
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alkali metals
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potassium (2)
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sodium (1)
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iron
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ferric iron (6)
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ferrous iron (4)
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-
rare earths
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europium (1)
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metamorphic rocks
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impactites (2)
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mylonites
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pseudotachylite (1)
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metamorphism (1)
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North America (2)
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oxygen (3)
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sedimentary rocks
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coal (1)
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sulfur (2)
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tektites (3)
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United States
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Georgia (1)
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sedimentary rocks
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sedimentary rocks
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coal (1)
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Non-Magmatic Glasses
Magmas are the Largest Repositories and Carriers of Earth’s Redox Processes
Earth’s Electrodes
Ca neighbors from XANES spectroscopy: A tool to investigate structure, redox, and nucleation processes in silicate glasses, melts, and crystals
The effect of the [Na/(Na+K)] ratio on Fe speciation in phonolitic glasses
Competition between two redox states in silicate melts: An in-situ experiment at the Fe K -edge and Eu L 3 -edge
North American microtektites are more oxidized than tektites
The [4] Fe 3+ –O distance in synthetic kimzeyite garnet, Ca 3 Zr 2 [Fe 2 SiO 12 ]
Effect of alkalis on the Fe oxidation state and local environment in peralkaline rhyolitic glasses
XAS determination of the Fe local environment and oxidation state in phonolite glasses
The iron oxidation state and coordination number have been determined by Fe K-edge X-ray absorption–near edge spectroscopy (XANES) for six tektites from the North American tektite strewn field (four bediasites and two georgiaites) and a tektite fragment from the Deep Sea Drilling Project (DSDP) Site 612, which is part of the North American tektite strewn field. All tektite samples display a pre-edge peak, the components of which are consistent with the presence of divalent Fe. Comparison of pre-edge peak data (integrated intensity and centroid energy) with those of Fe model compounds allows us to quantitatively determine the Fe oxidation state and coordination number. The Fe 3+ /(Fe 2+ + Fe 3+ ) ratio is close to 0.05 (±0.03), consistent with tektites from all the other strewn fields. The average Fe coordination number is intermediate between 4 and 5. Accurate determination of this value is hindered by the scatter of pre-edge peak intensity of all the Fe model compounds; [4] Fe/( [4] Fe + [5] Fe) is estimated to be 0.26 ± 0.15. In contrast to North American microtektites, for which iron oxidation state and coordination numbers display significant variations across the North American strewn field, no significant variations in the Fe oxidation state and coordination number were found between the georgiaites, bediasites, and the DSDP 612 tektite fragment. It is remarkable that the tektite fragment from the DSDP 612 site showed no sign of oxidation despite the long burial period in marine sediments.