Do Magnetite Layers In Algoma-Type Banded Iron Formations (BIF) Preserve Their Primary Geochemical Signature? A Case Study of Samples From Three Archean BIF-Hosted Gold Deposits
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چکیده
منابع مشابه
Phosphates in Banded Iron Formations (bif). a Tool for Exploring Ancient
Introduction: Microbial metabolic activity is significant in the cycling of phosphorus in aquatic and sedimentary environments. The requirement of microorganisms to use elemental phosphorous for energy transfer and to bind, concentrate and cause crystalliza-tion of phosphates is well established [e.g. 1,2]. The crystallization of phosphates in a sedimentary environment commonly occurs when the ...
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Incomplete factorizations represent a class of algebraic preconditioners important from both theoretical and practical points of view. While state-of-the-art preconditioners of this kind can be very useful, very large problems, arising, e.g., from discretizations of complicated operators on unstructured grids typically, still may require more robust preconditioners. High-quality incomplete fact...
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Early Earth processes are typically identified through the study of mineralogical, elemental and isotopic features in the rock record, including Precambrian banded iron formations (BIF). However, postdepositional processes often obscure the primary geochemical signals, making the use of BIF as proxies for paleo-seawater and the paleo-biosphere potentially imprecise. Thus, alternative approaches...
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The effect of hydrogen on the rate of phototrophic Fe(II) oxidation by two species of purple bacteria was measured at two different bicarbonate concentrations. Hydrogen slowed Fe(II) oxidation to varying degrees depending on the bicarbonate concentration, but even the slowest rate of Fe(II) oxidation remained on the same order of magnitude as that estimated to have been necessary to deposit the...
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Banded iron formations (BIFs) are rock deposits common in the Archean and Paleoproterozoic (and regionally Neoproterozoic) sedimentary successions. Multiple hypotheses for their deposition exist, principally invoking the precipitation of iron via the metabolic activities of oxygenic, photoferrotrophic, and/or aerobic iron-oxidizing bacteria. Some isolated environments support chemistry and mine...
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ژورنال
عنوان ژورنال: The Canadian Mineralogist
سال: 2016
ISSN: 0008-4476,1499-1276
DOI: 10.3749/canmin.1500090