COPPER AND COPPER ALLOYS IN ANCIENT TURKEY: SOME NEW ANALYSES

This note presents some new analyses for 13 early copper and bronze artefacts from Turkey in the Collection of the Ashmolean Museum, Oxford. They were not included in a small programme of early copper and bronze objects from Iraq, Syria and Palestine (Moorey and Schweizer 1972, Archaeometry 14 (2), 177–198) and conclude this pilot-project.     

COPPER AND COPPER ALLOYS IN THE SOUTHEASTERN ALPS: AN OVERVIEW*

In recent years, several groups of archaeological metal finds from the areas around the southeastern Alps, dated between Bronze Age and Roman times, have been scientifically analysed (by ICP, AAS and/or XRF) within the framework of different projects. The data now available give a fairly good general picture of the evolution and development of metallurgy in this area and seem to indicate that the region played an important role in the exchange of objects and raw materials over many centuries. The significance of some of the metal finds, which are particularly relevant for this research, is discussed.     

ANCIENT EGYPTIAN BLACK‐PATINATED COPPER ALLOYS*

This analytical study aims to investigate ancient Egyptian black‐patinated copper alloys. The study group was selected from the collections of the Egyptian Museum in Cairo and from the Faculty of Archaeology Museum in Cairo University. Examination and analysis were undertaken using optical microscopy (OM), scanning electron microscopy (SEM), energy‐dispersive spectroscopy (EDX), X‐ray diffractometry (XRD), X‐ray fluorescence analysis (XRF) and Fourier transform infrared spectroscopy (FTIR). The analysis results indicated that the black patina contained mainly tenorite (CuO). The study presents evidence of thermal patination and animal glue coating.     

IRON IN ANCIENT COPPER

Analysis of early copper-base artifacts invariably reveals traces of iron. Iron enters the copper during the smelting process and the level of iron in the metalwork is an indication of the smelting technology. In areas such as Western Europe where prehistoric slag heaps are absent even in the proximity of undoubted ancient mines, the iron content is low reinforcing the link between smelting technology and iron content. Very occasionally the iron content was deliberately encouraged and alloys containing between 30% and 50% of iron in copper were made, mainly for use in currency. These alloys are without modern parallel and their metallography and method of production are considered in some detail here.     

ENERGY DISPERSIVE X-RAY FLUORESCENCE ANALYSIS OF ANCIENT COPPER ALLOYS: EMPIRICAL VALUES FOR PRECISION AND ACCURACY

Energy dispersive X-ray fluorescence (EDXRF) analyses are compared with neutron activation as well as atomic absorption analyses of ancient copper-based alloys in order to examine their accuracy and to estimate realistic values for precision and sensitivity of EDXRF. The results show that it is possible to obtain reliable data of the surface composition of objects non-destructively. Better results for bulk composition are usually obtained with drill samples where the sensitivity of the method is at least competitive with atomic absorption spectroscopy with flame atomization.     

ARAMAIC BASALT STATUES FROM TELL HALAF,SYRIA: LOCATING THE ANCIENT QUARRIES

Tell Halaf is the locality of the ancient Aramaic city of Guzāna (c. 1000–800 bc ) in Syria. The statues of Tell Halaf were made from monolithic basalt blocks, comprising massive as well as amygdaloidal types. However, the exact location of the original quarries was as yet unknown. Reconnaissance mapping and sampling concentrated on the four basaltic centres in the vicinity of Tell Halaf, covering both south‐eastern Turkey and north‐eastern Syria. In addition, basaltic artefacts from the two archaeological sites of Tell Beydar (c. 2700–2300 bc ) and Djebelet el Beda (c. 2600–2350 bc ) were investigated. All basalt samples were analysed for their bulk rock major and trace element compositions by X‐ray fluorescence, ICP–MS analysis and the mineral chemistry of individual minerals by combined electron microprobe analysis and laser‐ablation ICP–MS. The data show that basalt works of art from all three archaeological sites were derived from the Syrian basalt plateau of Ard esh‐Sheikh, approximately 57 km south of Tell Halaf. Accordingly, this basalt quarry was actively exploited over a considerable time span of c. 1900 years. This study demonstrates that petrographic and geochemical investigations of basalt, combined with electron microprobe and laser‐ablation ICP–MS analysis of minerals, are powerful tools to discriminate between possible sources of raw materials, especially if isotopic data yield unsatisfying results.     

THE EXCHANGES OF COPPER IN THE ANCIENT MIDDLE EAST

Introduction In Anatolia, the birth and the development of metallurgy intervened between the 9th and 3rd millenniums as well as testify the more and more frequent apparitions of metals artefacts in the inventory of the archeological objects of this period.     

ANGLO-SAXON COPPER ALLOYS FROM LECHLADE, GLOUCESTERSHIRE

Summary. A range of copper-alloy artefacts from the early Anglo-Saxon cemetery at Lechlade were analysed using X-ray fluorescence. There were few pure bronzes or brasses in the assemblage and most alloys contained significant amounts of zinc, tin and lead in variable ratios. In view of the current theory that supplies of new metals and ores were limited and Anglo-Saxon metalworkers normally used scrap metal, the compositions were used to assess the techniques of the craftsmen supplying this community. It is concluded that re-use of copper alloys was prevalent but that metals were selected quite carefully for particular applications, with regard to the metallurgical characteristics required.     

THE ISOTOPIC COMPOSITION OF TIN IN SOME ANCIENT METALS AND THE RECYCLING PROBLEM IN METAL PROVENANCING

A recent suggestion that some ancient metallurgical processes might give rise to large changes (> 0.5%) in the isotopic composition of tin gave hope that it might be possible to identify ancient bronze samples which had undergone recycling and mixing processes. This paper describes a method for the analysis of the isotopic composition of tin by thermal ionization mass spectrometry and applies it to analyse a number of ancient bronzes and tin metal objects from the Bronze Age Mediterranean. No observable isotopic fractionation of tin was found above $0.1% in the ratio¹²² Sn/¹¹⁶. Consequently, either recycling of bronze in the Late Bronze Age Mediterranean was not so common as supposed, or the isotopic composition of tin is not fractionated by anthropogenic metallurgical processes to the extent predicted by the Bradford group.     

PRE-ISLAMIC CERAMIC GLAZES AT KISH AND NINEVEH IN IRAQ

Chemical analyses (mainly by XRF) have been made of a series of glazed pottery vessels and sherds excavated from Kish and Nineveh in Iraq, manufactured between c. 600 b.c. and a.d. 600 (also a small Islamic group from Hira). The results strongly suggest, contrary to general assumption, that lead glazing was not practised in this area at this time; that the local glazing tradition persisted unchanged for 1200 years; and that the production at different periods, or at different places, can be characterized by statistically significant variations in the glaze composition.     

中国古代损钱取铜的历史考察

所谓“损钱取铜”,即通过磨鑢、剪凿等方式,从铜钱上取铜谋利的行为。取铜量以不过分影响铜钱的正常流通为标准,是种对铜钱适度减重的做法,它不同于使铜钱彻底退出流通的“毁钱取铜”。损钱取铜是存在于中国古代铜钱流通中的重要现象,几乎与古代铜钱的行用相始终。本文试图通过对发掘报告和钱币实物的考察,勾勒出中国古代损钱取铜的特征及其演变轨迹,进而揭示其对当时钱币铸造形制的影响。粗成小文,求正于方家。一、战国时期的损钱取铜情况战国处于中国铜铸币的滥觞期,此时损钱取铜的现象就已存在。根据出土实物,以齐地的“截首刀”最为明显…     

PRE-COLUMBIAN METALLURGY: TECHNOLOGY,MANUFACTURE, AND MICROPROBE ANALYSES OF COPPER BELLS FROM THE GREATER SOUTHWEST*

Twenty-four cast copper crotals (commonly called bells), one 'spilled bell’, one tinkler bell and a number of minerals from locations throughout the Greater Southwest were analysed for their elemental composition by a PIXE nuclear microprobe at Los Alamos National Laboratory, New Mexico, USA. Sixteen bells contained minor and trace amounts of silver, antimony, arsenic, lead, and in some cases tin, strontium, and selenium. Nine bells contained little or no detectable amounts of these elements. This suggests that several workshops throughout the Greater Southwest and Mexico might have manufactured these bells.     

TIN AND PREHISTORIC MINING IN THE ERZGEBIRGE (ORE MOUNTAINS): SOME NEW EVIDENCE

Summary. A number of settlements and other traces of occupation have been identified in the mountainous areas near to tin and copper deposits in the Erzgebirge, and some of them excavated. The newly collected evidence seems to suggest that many small sources of metals, both tin and copper, were exploited, the former metal by washing from the river and creek beds. Though these sources were more modest than the British and Spanish tin supply, they seem to have served the Bohemian and Saxon Bronze Age cultures well.