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Journal Article
Journal: AAPG Bulletin
Published: 01 December 2017
AAPG Bulletin (2017) 101 (12): 1945-1970.
... (Carbon, Hydrogen, Nitrogen, Sulfur, and Iron) and Stable Carbon Isotopes of Isolated Kerogen Sample Number Elemental Analyses (wt. %) Atomic δ 13 C (versus PDB) Nitrogen Carbon Hydrogen Sulfur (Total) Iron (Total) Sulfur (Pyrite) Sulfur (Organic) H/C H/[H + C] S org /C Mean Std. Dev...
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Journal Article
Published: 30 November 2017
The Canadian Mineralogist (2017) 55 (6): 1009-1025.
...Jennifer L. Bentz; Ronald C. Peterson AbstractNaturally occurring arsenic (As)-bearing minerals in iron (Fe)-poor, sulfate (SO4)-rich sediments are poorly understood due to the complexity of As speciation and the scarcity of environments where As concentrations exceed mineral saturation. Sediment...
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Series: GSA Memoirs
Published: 01 January 2015
DOI: 10.1130/2015.1212(08)
Series: GSA Special Papers
Published: 01 August 2013
DOI: 10.1130/2013.2497(05)
... >54 wt%, MgO contents ranging from ~2.5 to 6.5 wt%, and TiO 2 ranging from 1.6 to 2.8 wt%, with an enrichment in iron and incompatible elements relative to mid-ocean-ridge basalt. Although most Grande Ronde Basalt flows have homogeneous compositions, some are heterogeneous. Dikes that fed...
Series: GSA Special Papers
Published: 01 December 2011
DOI: 10.1130/2011.2483(18)
... for the first billion years on Mars. The origin of life on Earth may have occurred in iron-sulfur hydrothermal settings, and early Mars likely had similar environmental conditions. An excellent terrestrial analog for acid-sulfate weathering of Mars-like basalts exists at Cerro Negro, Nicaragua, where acidic...
Series: GSA Memoirs
Published: 01 September 2010
DOI: 10.1130/2010.1206(13)
... in the New Jersey Highlands. Iron was sourced from Fe-rich Mesoproterozoic rocks at depth, where it was leached by hydrothermal fluids that migrated upward along extensional faults. Iron and other metals were precipitated in permeable basin sediments and chemically favorable volcanic rocks, as well...
Series: GSA Special Papers
Published: 01 September 2010
DOI: 10.1130/2010.2465(31)
... 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...
Series: GSA Special Papers
Published: 01 September 2010
DOI: 10.1130/2010.2465(32)
... at the bottom of the sample shows Fe to be a mixture of Fe 2+ and Fe 3+ , with a Fe 3+ /(Fe 2+ + Fe 3+ ) ratio close to 0.5. This demonstrates that during the nuclear explosion, the ground rock was instantaneously reduced, transforming all the iron from mostly trivalent state to almost exclusively divalent...
Series: GSA Reviews in Engineering Geology
Published: 01 January 2007
DOI: 10.1130/2007.4118(08)
EISBN: 9780813758183
... SO 3 N.D. 0.027 0.029 H 2 O 2.06 N.D. N.D. LOI § 1.61 N.D. N.D. Total 98.82 98.254 98.318 * Fe 2 O 3 refers to total iron. † N.D.—no data. § LOI—loss on ignition. TABLE 6. Chemical Analyses of Representative Siderite-Nodule (Sq8), Fireclays (F1...
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Series: Reviews in Engineering Geology
Published: 01 January 2007
DOI: 10.1130/2007.4017(04)
EISBN: 9780813758176
... iron load to Cement Creek Silver Wing Mining Co. Silver Wing mine Animas River, site #125 Collect acidic mine water, install hydrological controls 1995 Divert acidic drainage around mine-waste dump, reduce metals loading to Animas River Private and Public Funds Silver Wing Mining Co. Silver...
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Series: Reviews in Engineering Geology
Published: 01 January 2007
DOI: 10.1130/2007.4017(09)
EISBN: 9780813758176
... 0.143 0.201 18.0 6.01 15.5 4.75 Figure 3. Graph comparing dissolved iron concentrations from 1996 to 2000 measured in water at the mine portal and monitoring well. Figure 4. Graph comparing zinc concentrations from 1996 to 2000 measured in water at the mine portal...
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Series: GSA Memoirs
Published: 01 January 2006
DOI: 10.1130/2006.1198(04)
.... 3500 Ma Onver-wacht Group) and later ferruginous sediments (ca. 3230 Ma Fig Tree Group). The geochemistry of banded iron-formations and associated rocks also led Ohmoto et al. (this volume) to conclude that the Archean oceans were sulfate-rich and generally oxygenated, except in local basins...
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Series: GSA Memoirs
Published: 01 January 2006
DOI: 10.1130/2006.1198(12)
.... REE evidence indicates that most of this enhanced Fe and Mn flux came from diagenetic remobilization of detrital oxides rather than from ridge-crest hydrothermal systems, in contrast to the Paleoproterozoic banded iron formations. Rapid introduction of lateritic soil residues to restricted basins...
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Series: GSA Special Papers
Published: 01 January 2006
DOI: 10.1130/2006.2416(13)
Series: GSA Special Papers
Published: 01 January 1993
DOI: 10.1130/SPE276-p45
... expressed in iron-rich varves during the past 3800 years, with a shift from cyclicity of ~100 years to 40–50 years between the Medieval Warm Epoch and the Little Ice Age. ...
Series: GSA Special Papers
Published: 01 January 1993
DOI: 10.1130/SPE286-p23
Series: GSA Special Papers
Published: 01 January 1991
DOI: 10.1130/SPE258-p9
Series: GSA Special Papers
Published: 01 January 1990
DOI: 10.1130/SPE246-p205
Series: GSA Special Papers
Published: 01 January 1987
DOI: 10.1130/SPE215-p25