5 research outputs found
A ‘match–no match‘ numerical and graphical kernel density approach to interpreting lead isotope signatures of ancient artefacts
No full textsponsorship: The authors gratefully acknowledge the financial support of the KU Leuven Research Council (Bijzonder Onderzoeksfonds project number C14/19/060). The paper greatly benefited from a Visiting Fellowship by Patrick Degryse at All Souls College, Oxford. (KU Leuven Research Council|C14/19/060, All Souls College, Oxford)status: Publishe
Dataset of lead isotope ratios of copper ores.
No full textThis dataset was compiled from the literature. All samples analyzed prior to 1980 are excluded, due to poorer precision before that date. The ores have been placed in groups corresponding to countries or important regions. In most papers the ratios 208Pb/206Pb, 207Pb/206Pb and 206Pb/204Pb were given. The ratios 208Pb/204Pb and 207Pb/204Pb shown have been calculated from the other values. All samples which were published with only two isotope ratios are excluded
Dataset of lead isotope ratios of lead ores.
No full textThis database was compiled from the literature.
All samples analysed prior to 1980 are excluded, due to poorer precision before that date.
The ores have been placed in groups corresponding to countries or important regions.
In most papers the ratios 208Pb/206Pb, 207Pb/206Pb and 206Pb/204Pb were given. The ratios 208Pb/204Pb and 207Pb/204Pb shown have been calculated from the other values.
All samples which were published with only two isotope ratios are excluded
Provenancing ancient materials with lead isotopes:overlap uncovered
No full textLead isotope analysis has been used to provenance metals such as lead, silver and bronze for many decades. Different approaches to interpret lead isotope ratios were proposed, and various limitations of the method have been discussed and addressed. Overlap in composition between different possible ore sources is always mentioned as a major limitation in lead isotope studies. However, it has never been comprehensively studied using a multivariate statistical approach. In this paper, the kernel density estimation (KDE) approach previously proposed by the authors is applied to calculate overlap between possible ore source regions. Firstly, the copper and lead ores of the same regions are compared, to assess if they are consistent and thus can be combined to increase sample size for provenance studies. Secondly, the pair-wise overlap between all the mining regions is calculated to determine if the distinction can actually be made between those ore fields. The use of one-dimensional KDE’s is very effective for calculation and assessment of the overlap between ore sources. This study argues that merging the lead and copper ore data might increase the reliability of a region’s KDE’s in most cases, but the overlap should be assessed beforehand. Furthermore, the study provides useful tools to verify for every pair of possible ore sources if it is theoretically possible to discriminate between them, and to what extent.</p
Transformative copper metallurgy in Chalcolithic Cyprus: a reappraisal
No full textsponsorship: We wish to thank the Royal Commission for AlUla for its support. We extend special thanks to the Governor, His Highness Prince Badr bin Abdullah bin Mohammad bin Farhan Al Saud; CEO, Amr AlMadani; and the Director of Archaeology and Cultural Heritage Research, Rebecca Foote. We would like to acknowledge the assistance of Laura Strolin, Jamie Quartermaine, Wael Abu-Azizeh and Huw Groucutt. Finally, we thank David Kennedy, who first introduced us to mustatils and whose exemplary work is the reason this project exists. (Royal Commission for AlUla)status: Publishe
