Potential Discrimination of Belgian Black Marbles Using Petrography, Magnetic Susceptibility and Geochemistry

Autor: Geoffrey Poulain, Francis Tourneur, Johan Yans, Frédéric Boulvain
Rok vydání: 2020
Předmět:
Zdroj: Archaeometry. 62:469-492
ISSN: 1475-4754
0003-813X
DOI: 10.1111/arcm.12530
Popis: Five varieties of Belgian black marbles are investigated in order to discriminate them. Their age ranges from Frasnian (Golzinne) to Visean (Dinant, Theux, Basècle, Lives). Three methods were used: petrography, magnetic susceptibility and geochemistry of major elements and Rare Earth Elements (REE). The petrographic analyze reveals 16 microfacies reflecting very quiet environments, sporadically perturbed by more energetic phenomena like turbidites or storms. These microfacies are integrated in two depositional models: a quiet offshore setting, below or close to the storm wave base (Salet, Basècles) and a shallow but very restricted zone, protected from waves and currents (Lives and Golzinne). The magnetic susceptibility results show that all the black marbles are characterized by very low, even slightly negative values, except the Golzinne one which shows higher values. Geochemical data allow to discriminate between the Theux black marble (low SiO2 content), and the Basècles samples (low Al2O3, K2O and REE contents). These methods could be useful to determine/refine the origin of archaeological stones, even if all these analyses are destructive. Two archeologic samples were investigated in order to identify their possible origin.
Databáze: OpenAIRE
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