Potassium Distribution and Metasomatism In Pelites and Schists: How and When, Relation To Postdepositional Events

Kamp, Peter C. van de

doi:10.2110/jsr.2016.44

Cited by 22 publications

(12 citation statements)

References 265 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…9A). If the K/Rb ratio is not stable and tends to be larger than that in the UCC, post-sedimentary enrichment by K (metasomatism) could have acted (van den Kamp, 2016). The impact of metasomatism was also evaluated using A-CN-K plots (Fedo et al, 1995, also used by Zhao et al, 2018, microscopic examination of clay mineral particles to distinguish their detrital and autochthonous origin (Martínez-Braceras et al, 2017;Wang et al, 2017), and mineral (micro)analysis (Kříbek et al, 2017;Foerster et al, 2018) to…”

Section: Checklist For Interpretation Of K Concentrations In Sedimentsmentioning

confidence: 99%

“…(2) In hydrologically closed lacustrine or palustrine environments, the main mechanism controlling K concentrations may be the neo-formation of K-carriers in sediments in contact with pore waters mineralised during prolonged droughts (Foerster et al, 2015), in particular formation of analcime, illite, and feldspars from dissolved K + , kaolinite and other clay minerals (Larsen, 2008;Kříbek et al, 2017;Foerster et al, 2018). This mechanism is thermodynamically analogous to "retrograde" clay mineral formation in the marine environment (Cuadros et al, 2017) and basinal brines (van den Kamp, 2016). (3) Fine(clayey) siliciclastic sediments may undergo K-metasomatism, either in basinal brines rich in K + , or in closed systems in which fine clastic deposits alternate with arkosic beds and are subjected to K + migration and retrograde reactions in the circulating pore water (van den Kamp, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Geochemistry offers several inter-element relationships that could reveal possible nonclimatic controls of K concentrations (e.g., Bouchez et al, 2011;van den Kamp, 2016;Xu et al, 2018;Zhao et al, 2018…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Checklist for the use of potassium concentrations in siliciclastic sediments as paleoenvironmental archives

Grygar

Mach²,

Martínez

2019

Sedimentary Geology

View full text Add to dashboard Cite

Weathering indices quantify the release of mobile elements from source units of soils and sediments. They have been employed in geosciences for more than three decades, but their performance in sedimentary archives can still be improved by deciphering other forcing factors than climatic. From the most common alkali and alkaline earth metals included in the weathering indices, K seems to be most suitable for deciphering paleoclimate records of temperate to subtropical non-arid climates, assuming the interpretation respects the complex of controlling factors on sediment geochemistry. As a case study, normalised K concentrations in siliciclastic sediments of the Most Basin (Miocene period, central Europe) are revisited here and variations compared with modern fluvially transported solids. Existing knowledge on manifold controls of K concentrations in sediments is summarised and used to propose list of possible controlling factors, in particular Al/Si and Zr/Rb as grain-size proxies, Ti/Al as provenance proxy relevant for K concentration in parent rocks,

show abstract

Section: Checklist For Interpretation Of K Concentrations In Sedimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Checklist for the use of potassium concentrations in siliciclastic sediments as paleoenvironmental archives

Grygar

Mach²,

Martínez

2019

Sedimentary Geology

View full text Add to dashboard Cite

show abstract

“…Following Kump et al 2011, we obtained measurements of K abundances for a subset of our samples to track the effects of metasomatic alteration on the nitrogen isotope data. K is mobile in sediments because it can be released from K-feldspars during diagenesis (van de Kamp, 2016). The similarity in charge and size between K + and NH 4 + has led to the proposal that NH 4 + may follow K + in metasomatic fluids (Godfrey and Falkowski, 2009;Kump et al, 2011).…”

Section: Potassium Abundances In Bulk Rocks As a Proxy For Metasomatismmentioning

confidence: 99%

Differential metamorphic effects on nitrogen isotopes in kerogen extracts and bulk rocks

Stüeken

Zaloumis

Meixnerova

et al. 2017

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

The last decade has seen a steady rise in the number of publications on nitrogen isotopes in sedimentary rocks, which have become an established tool for investigating the evolution of life and environmental conditions. Nitrogen is contained in sedimentary rocks in two different phases: bound to kerogen or substituted in potassic minerals (mostly K-bearing phyllosilicates and feldspars). Isotopic measurements and interpretations typically focus either on kerogen extracts alone or on bulk rocks that include both phases. The community is split about which sample type more accurately captures the original composition of the biomass. To address this question, we combined nitrogen isotopes and carbon-to-nitrogen ratios with carbon-to-hydrogen ratios which act as an independent proxy for metamorphic alteration. Our results reveal that metamorphism drives kerogen-bound nitrogen isotopically lighter while silicate-bound nitrogen becomes heavier. For rocks up to greenschist facies, the isotopic effect of this internal partitioning (up to 3-4‰) is larger than the isotopic effect of metamorphic nitrogen loss from the system (up to 1-2‰). The opposite may be true for higher metamorphic grades. We conclude that for low-grade sedimentary rocks with more than 60% of their total nitrogen residing in the silicate phase the primary isotopic composition of the biomass is best approximated by the bulk rock measurement, whereas for high-grade rocks the kerogen extract may be the more accurate proxy. The isotopic difference between nitrogen phases can thus serve as a rough indicator of the degree of metamorphic alteration.

show abstract

“…We do not have any explanation for this control, however, re-crystallisation of clay J o u r n a l P r e -p r o o f mineral grains around the autochthonous siderite crystals has been reported by Geptner et al (2016) and attributed to bacterial activity. The sensitivity of the K/Rb ratio to sediment diagenesis has been reported by van de Kamp (2016). Irrespective of what process is behind this influence, the K/Rb ratio in the Most Basin sediments needs chemical corrections, for which concentrations of Fe (Table 1) or Fe, Ca, and Mg (Table 2) were used.…”

Section: Lithological Correction Of Weathering Proxiesmentioning

confidence: 94%

Lithological correction of chemical weathering proxies based on K, Rb, and Mg contents for isolation of orbital signals in clastic sedimentary archives

Grygar

Mach²,

Hron

et al. 2020

Sedimentary Geology

View full text Add to dashboard Cite

This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

show abstract

Potassium Distribution and Metasomatism In Pelites and Schists: How and When, Relation To Postdepositional Events

Cited by 22 publications

References 265 publications

Checklist for the use of potassium concentrations in siliciclastic sediments as paleoenvironmental archives

Checklist for the use of potassium concentrations in siliciclastic sediments as paleoenvironmental archives

Differential metamorphic effects on nitrogen isotopes in kerogen extracts and bulk rocks

Lithological correction of chemical weathering proxies based on K, Rb, and Mg contents for isolation of orbital signals in clastic sedimentary archives

Contact Info

Product

Resources

About