Geochemistry and provenance of Rhenohercynian synorogenic sandstones: implications for tectonic environment discrimination

Floyd, P. A.; Shail, RK; Leveridge, B. E.; Franke, Wolfgang

doi:10.1144/gsl.sp.1991.057.01.14

Cited by 134 publications

(132 citation statements)

References 64 publications

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“…Zn/Sc is markedly elevated. The La/Th (~2.89) to Hf/Sc (~0.65) ratios are indicative of source rocks in the active continental margin field (for details see, e.g., Floyd et al 1991). The distribution of REE (PAAS-and Lu-normalized) is very close to that calculated for the most common mixed eolian materials (Nozaki 2001, Hladil et al 2006).…”

Section: Chemical Composition Of Sedimentsupporting

confidence: 59%

An anomalous atmospheric dust deposition event over Central Europe, 24 March 2007, and fingerprinting of the SE Ukrainian source

Hladil¹,

Strnad²,

Šálek³

et al. 2008

Bull. Geosci.

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An anomalous event of Ukrainian quartz-dominated dust deposited in the Czech Republic and adjacent countries on 24 March 2007 was studied with special emphasis on sedimentology, mineralogy and geochemistry. The dust deposition combined a typical eolian depositional mode with one mediated by dirty rain or drizzle. The main stage of sediment deposition was short (several tens of minutes) and synchronous with rapidly increased concentration of particles smaller than 10 μm in the atmosphere above ground. The polydisperse and multimodal sediment consisted predominantly of angular to subrounded quartz particles, of which 80-90 wt.% were silt sized (4-63 μm). A small amount of sand grains up to 0.5 mm in size was regularly observed (≤ 10 wt.%) and was higher than that of particles smaller than 4 μm. This relatively coarse material was transported by atmospheric flows over distances of 1400 to 2000 km. The deposited silt film was fenestrally arranged and showed various reticulate and patchy patterns of several sizes. The intensity of deposition in the main deposition areas corresponded to 2.3 g/m 2 of particulate solids on average. The interpreted depositional processes are based on direct observation and dust microphysics. Besides the preferentially entrained and delivered quartz, the sediment contains also perthitic feldspar, chlorite and chloritoids, and notably low amounts of mica, clay minerals and carbonate. The element content does not contradict the supposed source based on meteorological observations, i.e., from surface argillaceous and sandy soils east of Kherson, Ukraine. Particularly minor and trace element distributions are almost identical and show a nearly perfect match, closely similar to those of standards for the upper crust (not sediments). Total Fe concentrations in the sediment are about 2-3 wt.%, i.e., slightly less than those for the upper continental crust on average, yet with a large proportion of iron still bound in mineral inclusions in quartz and silicates. Smooth REE patterns correspond to the most common multi-cycle eolian material and are typical for the assumed source area. Lead isotope signatures combine a natural lithic imprint and anthropogenic contamination by petrol combustion, thereby giving a somewhat different trend compared to African sources. Palynological analysis enabled tracking of the trajectory of the dust-flow but also identified typical markers, such as ragweed pollen, from the source area.•

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Section: Chemical Composition Of Sedimentsupporting

confidence: 59%

An anomalous atmospheric dust deposition event over Central Europe, 24 March 2007, and fingerprinting of the SE Ukrainian source

Hladil¹,

Strnad²,

Šálek³

et al. 2008

Bull. Geosci.

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“…4), negative Eu anomalies (Eu/Eu* 0.67-0.93; Fig. 7) and Th/Sc Floyd et al (1991). ratios (mostly less than 1.0; Fig. 4), favor the OUC provenance for the Lower Cretaceous sediments.…”

Section: Fig 7 Chondrite Normalized Ree Diagrams For the Lower Cretmentioning

confidence: 90%

Geochemistry of Lower Cretaceous sediments, Inner Zone of Southwest Japan. Constraints on provenance and tectonic environment.

et al. 2000

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A geochemical study was carried out on Lower Cretaceous sedimentary rocks of the Wakino Subgroup, Kenseki Formation, and Sasayama Group, distributed in the Inner Zone of Southwest Japan. The chemical characteristics of the Lower Cretaceous sediments indicate that these rocks are immature firstorder sediments derived from igneous and/or meta-igneous rocks of predominantly felsic composition. The sediments from the Kenseki Formation and the Sasayama Group, however, show high Cr and Ni abundances, suggesting a significant contribution of detritus from ultramafic rocks. Weathering at the source areas was moderate.The high Th/U ratios (mostly > 3.8), negative Eu anomalies (Eu/Eu* between 0.67 and 0.93) and Th/Sc ratios (mostly between 0.5 and 1) of the Lower Cretaceous sediments suggest their derivation dominantly from an old upper crust with minor amounts of young arc-derived detritus. The major, trace and rare earth element compositions imply that deposition took place in an active continental margin environment. The small amounts of young arc-derived material in the sediments support the inference by other workers that arc magmatism was not so prominent in Southwest Japan during the early Cretaceous.

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“…Comparison with average multielement patterns for different tectonic settings (Floyd et al 1991) shows components of both `continental arc/active margin' and `passive margin' provenance in the formations of the Skiddaw Group (Fig. 14).…”

Section: B Geochemistrymentioning

confidence: 99%

The stratigraphy, correlation, provenance and palaeogeography of the Skiddaw Group (Ordovician) in the English Lake District

et al. 1995

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Geochemistry and provenance of Rhenohercynian synorogenic sandstones: implications for tectonic environment discrimination

Cited by 134 publications

References 64 publications

An anomalous atmospheric dust deposition event over Central Europe, 24 March 2007, and fingerprinting of the SE Ukrainian source

An anomalous atmospheric dust deposition event over Central Europe, 24 March 2007, and fingerprinting of the SE Ukrainian source

Geochemistry of Lower Cretaceous sediments, Inner Zone of Southwest Japan. Constraints on provenance and tectonic environment.

The stratigraphy, correlation, provenance and palaeogeography of the Skiddaw Group (Ordovician) in the English Lake District

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