Cation-leaching sites in rock varnish

Ronald Dorn; D. H. Krinsley

doi:10.1130/0091-7613(1991)019<1077:CLSIRV>2.3.CO;2

Cation-leaching sites in rock varnish

Ronald Dorn, D. H. Krinsley

Geographical Sciences and Urban Planning, School of (SGSUP)

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

Abstract

Backscatter electron microscopy of subaerial rock varnish reveals porous textures that are sites of cation leaching with lowered (K ⁺ + Ca ²⁺ )/Ti ⁴⁺ ratios and concentrations of manganese and iron. Laboratory studies show that rates of potassium and calcium leaching increase with temperature, time, and surface area, and decrease when varnish interdigitates with coatings of amorphous silica. Only varnishes with continuous layering should be used in paleoenvironmental research and paleomagnetic studies, not textures indicative of postdepositional modifications. -Authors

Original language	English (US)
Pages (from-to)	1077-1080
Number of pages	4
Journal	Geology
Volume	19
Issue number	11
DOIs	https://doi.org/10.1130/0091-7613(1991)019<1077:CLSIRV>2.3.CO;2
State	Published - Jan 1 1991

ASJC Scopus subject areas

Geology

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N2 - Backscatter electron microscopy of subaerial rock varnish reveals porous textures that are sites of cation leaching with lowered (K + + Ca 2+ )/Ti 4+ ratios and concentrations of manganese and iron. Laboratory studies show that rates of potassium and calcium leaching increase with temperature, time, and surface area, and decrease when varnish interdigitates with coatings of amorphous silica. Only varnishes with continuous layering should be used in paleoenvironmental research and paleomagnetic studies, not textures indicative of postdepositional modifications. -Authors

AB - Backscatter electron microscopy of subaerial rock varnish reveals porous textures that are sites of cation leaching with lowered (K + + Ca 2+ )/Ti 4+ ratios and concentrations of manganese and iron. Laboratory studies show that rates of potassium and calcium leaching increase with temperature, time, and surface area, and decrease when varnish interdigitates with coatings of amorphous silica. Only varnishes with continuous layering should be used in paleoenvironmental research and paleomagnetic studies, not textures indicative of postdepositional modifications. -Authors

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Cation-leaching sites in rock varnish

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