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Cobertura geogràfica
Extensió
11 p.
Resum
The Gavà phosphate deposit, mined during the Neolithic, was produced by weathering
processes affecting primary apatite beds. It exhibits a neat vertical zoning, related to chemical gradients
during weathering. Strengite, yellowish Al-rich strengite and ferroan variscite are found at the top, palegreen
variscite at the intermediate levels, and green variscite in depth. Fe values are very low in the
greenish samples, as well as Cr and V. Raman spectrums of the Gavà variscite show differences with
samples from other occurrences worldwide. Moreover, some spectral differences can also be observed
in the Raman spectra of variscite coming from different depths in the deposit. Raman spectroscopy can
be an efficient tool to discriminate not only samples from different geographical localities, but also from
its original position in a given deposit.
Key-words: variscite, Raman, microprobe, veins, supergene.
Citació
La parure en callaïs du Néolithique européen, p. 241-251
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