当前位置： SCI文献检索 > JOURNAL OF ENVIRONMENTAL RADIOACTIVITY期刊下所有文献 > Characterization and 10Be content of iron carbonate concretions for genetic aspects - Weathering, desert varnish or burning: Rim effects in iron carbonate concretions.

Characterization and 10Be content of iron carbonate concretions for genetic aspects - Weathering, desert varnish or burning: Rim effects in iron carbonate concretions.

Abstract：

:The research investigated three iron carbonate (siderite) sedimentary concretions from Nagykovácsi, Úri and Délegyháza, Hungary. To identify possible source rocks and effects of the glaze-like exposed surface of the concretions, we carried on comparative petrological, mineralogical, geochemical and isotopic studies. The samples were microbially mediated siderite concretions with embedded metamorphous and igneous mineral clasts, and had specific rim belts characterized by semi-concentric outer Fe-oxide layers, fluffy pyrite-rich outer belts and siderite inner parts. We investigated the cross section of the Fe-carbonate concretions by independent methodologies in order to identify their rim effects. Their surficial oxide layers showed evidence of degassing of the exposed surface caused most probably by elevated temperatures. The inner rim pyrite belt in the concretions excluded the possibility of a prolonged wet surface environment. Microtextural and mineralogical features did not support desert varnish formation. 10Be nuclide values of the Nagykovácsi and Uri concretions were far above the level of terrestrial in-situ cosmogenic nuclides, but they were consistent with the lowest levels for meteorites. Though the data were not conclusive to confirm any kind of known origin, they are contradictary, and open possibilities for a scenario of terrestrial meteorite origin.

journal_name

J Environ Radioact

journal_title

Journal of environmental radioactivity

authors

Polgári M,Bérczi S,Horiuchi K,Matsuzaki H,Kovács T,Józsa S,Bendő Z,Fintor K,Fekete J,Homonnay Z,Kuzmann E,Gucsik A,Gyollai I,Kovács J,Dódony I

doi

10.1016/j.jenvrad.2016.11.005

subject

Has Abstract

pub_date

2017-07-01 00:00:00

pages

58-69

eissn

0265-931X

issn

1879-1700

pii

S0265-931X(16)30554-9

journal_volume

173

pub_type

杂志文章

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