Rinded iron-oxide concretions: hallmarks of altered siderite masses of both early and late diagenetic origin
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چکیده
منابع مشابه
Morphologic Clues to the Origins of Iron Oxideâ•fiCemented Spheroids,Boxworks, and Pipelike Concretions, Navajo Sandstoneof South-Central Utah, U.S.A
Concretions cemented by iron oxide are abundant and diverse in the Jurassic Navajo Sandstone of southern Utah. Some of these structures are considered terrestrial analogs for concretions imaged on Mars. The Navajo concretions can be spheroidal, pipelike, or tabular with multicompartmented boxworks. These iron oxide concretions typically display a rinded structure: dense sandstone rinds cemented...
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Leonardo Sagnotti,1 Andrew P. Roberts,2 Richard Weaver,2 Kenneth L. Verosub,3 Fabio Florindo,1 Christopher R. Pike,3 Trevor Clayton2 and Gary S. Wilson4 1Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata, 605, I-00143 Rome, Italy. E-mail: [email protected] 2School of Ocean and Earth Science, University of Southampton, Southampton Oceanography Centre, European Way, Southampton S...
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Distinct layers of iron(III) and manganese(IV) (Fe/Mn) oxides are found buried within the reducing part of the sediments in Lake Baikal and cause considerable complexity and steep vertical gradients with respect to the redox sequence. For the on-site investigation of the responsible biogeochemical processes, we applied filter tube samplers for the extraction of sediment porewater combined with ...
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During deposition of Precambrian iron formation, the combined sedimentation of ferrihydrite and phytoplankton biomass should have facilitated Fe(III) reduction during diagenesis. However, the only evidence for this reaction in iron formations is the iron and carbon isotope values preserved in the authigenic ferrous iron-containing minerals. Here we show experimentally that spheroidal siderite, ...
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The calcareous concretions studied formed in different depositional environments associated with the Pcnnsylvanian eyclothems of cast central Ohio. The late syngenetic to early diagenetie coal balls from Lower Frecport Coal in Jefferson County were formed by cellular permineralization of decaying terrestrial plants in a peat swamp. These coal balls, composed of N9.N% calcite, 7.0% pyrite, and 2...
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ژورنال
عنوان ژورنال: Sedimentology
سال: 2012
ISSN: 0037-0746
DOI: 10.1111/j.1365-3091.2012.01325.x