A petrographic approach for evaluating trace-element mobility in a black shale

Lev, Steven; McLennan, Scott M.; Meyers, William J.; Hanson, Gilbert N.

doi:10.2110/jsr.68.970

Cited by 59 publications

(38 citation statements)

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“…The Monte Saint Giorgio samples are derived from black shale deposits, and several studies have showed that trace elements like U and REE can remobilize in such environments, frequently associated with late stage apatite formation (Lev et al, 1998(Lev et al, , 1999. Hence the flat, relatively evenly distributed REE profiles observed in the Meride Formation samples (Fig.…”

Section: The Ree Uptake Mechanismmentioning

confidence: 98%

Protracted diagenetic alteration of REE contents in fossil bioapatites: Direct evidence from Lu–Hf isotope systematics

Kocsis

Trueman

Palmer

2010

Geochimica et Cosmochimica Acta

100

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Section: The Ree Uptake Mechanismmentioning

confidence: 98%

Protracted diagenetic alteration of REE contents in fossil bioapatites: Direct evidence from Lu–Hf isotope systematics

Kocsis

Trueman

Palmer

2010

Geochimica et Cosmochimica Acta

100

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“…Monazite has long been considered to be thermodynamically unstable during diagenesis and sub-amphibolite facies metamorphism (Overstreet, 1967), however, a number of recent studies have identified monazite growth during diagenesis (Burnotte et al, 1989;Milodowski and Zalasiewicz, 1991;Lev et al, 1998), prehnitepumpelleyite facies metamorphism (Cabella et al, 2001;Rasmussen et al, 2001Rasmussen et al, , 2005 and greenschist facies metamorphism (Franz et al, 1996;Rasmussen et al, 2002;Wing et al, 2003).…”

Section: Growth Of Prehnite-pumpellyite Facies Monazitementioning

confidence: 99%

In situ U–Pb dating and element mapping of three generations of monazite: Unravelling cryptic tectonothermal events in low-grade terranes

Rasmussen

Fletcher

Muhling

2007

Geochimica et Cosmochimica Acta

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“…This also suggests the lack of (mature) organic matter in all samples. Ordinarily, organic matter-bearing black slates show anomalous high concentrations of trace elements, e.g., REE, or uranium (e.g., Lev et al 1998). Both sample types, discolored and dark-colored slate contain no sedimentary organic carbon and no diagenetic sulfide/sulfate sulfur.…”

Section: Discussionmentioning

confidence: 99%

Weathering of Fruchtschiefer building stones: mineral dissolution or rock disaggregation?

et al. 2011

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Building stones manufactured from contact metamorphic slates (Fruchtschiefer slate) from Theuma (Sachsen, Germany) were investigated for mineralogical alterations as well as for changes in porosity and surface roughness due to weathering. After weathering periods of several years to decades, the originally dark gray-colored slates show pale spots of several centimeters in size at the surface of building stones. The dark-colored and lightcolored sections of the slate show no differences in mineralogy. Surface weathering did not result in newly precipitated minerals. It was also found that the observed differences in color are not caused by variations in sedimentary organic carbon concentration or in sulfide/sulfate concentrations. Obtained results instead indicate that dark surface sections may show a thin cover of recent organic matter (OM), e.g., living OM, soot, dirt, etc. Microscopic investigations suggested that this cover was exfoliated at light-colored surface sections. The observed disaggregation of the upper 2 mm of the building block material results in an increase in porosity. Porosity of black (unweathered) slate is\2 vol.%. Due to weathering, the slate's pores with diameters [1 lm show a significant increase in frequency compared to the original pore size distribution. Porosity of weathered rock volumes increased to approx. 8 vol.%. Discolored surface sections show a higher surface roughness (root-mean-square roughness, Rq * 1 lm) compared to dark-colored slate surfaces (Rq * 200 nm), both data are for cleavage planes. Preferentially, the discolored surface sections are located close to the edges of cut stones. This and the alteration in porosity, pore size, and surface roughness indicate that color changes of the slate are largely influenced by rock disaggregation proceeding from the edges into the center rather than by mineral dissolution/ precipitation processes.

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A petrographic approach for evaluating trace-element mobility in a black shale

Cited by 59 publications

References 0 publications

Protracted diagenetic alteration of REE contents in fossil bioapatites: Direct evidence from Lu–Hf isotope systematics

Protracted diagenetic alteration of REE contents in fossil bioapatites: Direct evidence from Lu–Hf isotope systematics

In situ U–Pb dating and element mapping of three generations of monazite: Unravelling cryptic tectonothermal events in low-grade terranes

Weathering of Fruchtschiefer building stones: mineral dissolution or rock disaggregation?

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