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Titolo:
GEOCHEMICAL MICROANALYSIS OF PATINA LAYERS ON ROCK ARTIFACTS FROM THECENTRAL KAROO AND SOUTHERN FREE STATE, SOUTH-AFRICA
Autore:
PINEDA CA; MARTIN RT; HALLBAUER DK; JACOBSON L; PROZESKY VM; PRZYBYLOWICZ WJ;
Indirizzi:
GROOTE SCHUUR HOSP ZA-7925 OBSERVATORY SOUTH AFRICA NATL ACCELERATOR CTR,VAN DE GRAAFF GRP ZA-7131 FAURE SOUTH AFRICA UNIV STELLENBOSCH,DEPT GEOL ZA-7600 STELLENBOSCH SOUTH AFRICA MCGREGOR MUSEUM ZA-8300 KIMBERLEY SOUTH AFRICA
Titolo Testata:
Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms
fascicolo: 1-4, volume: 130, anno: 1997,
pagine: 628 - 635
SICI:
0168-583X(1997)130:1-4<628:GMOPLO>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
NAC NUCLEAR MICROPROBE; PROTON MICROPROBE; AGE-DETERMINATION; PIXE; VARNISH;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
17
Recensione:
Indirizzi per estratti:
Citazione:
C.A. Pineda et al., "GEOCHEMICAL MICROANALYSIS OF PATINA LAYERS ON ROCK ARTIFACTS FROM THECENTRAL KAROO AND SOUTHERN FREE STATE, SOUTH-AFRICA", Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms, 130(1-4), 1997, pp. 628-635

Abstract

In this study, patina layers on artefacts composed of different rock types were examined, with all specimens originating from arid and semi-arid environments of South Africa. Microscopic observations showed a continuous mineralogical change from the unaltered core to the rim, suggesting that the patina layer is the result of weathering and/or chemical leaching of the rock surface. Elemental mapping by micro-PIXE andSEM showed depletion in leachable elements such as Mg, K, Ca, Fe and to a lesser extent Al, Si and Mn towards the surface for all artefactsanalysed. This kind of distribution suggests the possibility that a leaching and exudation process through fluid activity might be responsible for the gradual, and in some cases extensive removal of the elements towards the patina surface.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/07/20 alle ore 03:52:39