几种罕见的黄铜钱币锈蚀产物的识别与形成原因探析

我国从明中期开始使用黄铜钱币,一直到清末。过去,对古代铸币的科学研究主要集中于合金成分分析和铸造工艺两方面,对锈蚀产物和锈蚀机理的研究主要针对青铜铸币。黄铜的合金元素中较青铜多锌元素,其腐蚀产物与腐蚀行为较青铜有一定的差别,也较青铜更为复杂,然而现有的文献关于此方面的研究匮乏,特别是对于大气保存环境下黄铜钱币的锈蚀产物及锈蚀成因的研究基本空白。本研究通过多种分析手段包括X射线荧光分析仪(XRF)、扫描电镜能谱仪(SEM-EDS)和显微激光拉曼光谱仪(Raman)对国家博物馆馆藏一批传世明清各时期的黄铜钱币合金组成,不同颜色的锈蚀产物等开展科学分析。研究结果表明,嘉靖、隆庆和万历年的黄铜铸币,为Cu+Sn+Pb+Zn四元合金,平均含量Cu 66.4%,Sn 6.8%,Pb 10.4%,Zn 15.6%,并含有微量Fe,不含As。泰昌、天启和崇祯年间及清代各时期的黄铜铸币,主要为Cu+Pb+Zn三元合金,并含有微量Fe、As和Sn。这批黄铜锈蚀产物与常见的青铜锈蚀产物不同,最典型的是钱币表面蓝绿色和白色锈蚀物,经Raman和SEM-EDS分析并结合相关文献初步确认蓝绿色锈蚀物为一种含铜、钠...     

Archaeomagnetic Dating of Pyrotechnological Contexts: a Case Study for Copper Smelting Sites in the Central Timna Valley,Israel

This study is focused on establishing age constraints for several copper slag deposits at the centre of the Timna Valley (Israel) via reconstruction of their ancient geomagnetic intensities as recorded by the individual slag samples at the time of their formation. The results show a correlation between the location of the slag deposits (labelled as individual ‘mounds’ in our survey) and their inferred ages, reflecting varying socio‐economic and political dynamics in the region. While the slag mounds found at the unprotected foothills represent a variety of dates (mostly Early Islamic), the slag mounds on the hilltops are chronologically constrained to the early Iron Age (late 11th to 10th centuries bce ), supporting the idea for a need for protection during this period. Furthermore, in comparing the new data with previous archaeomagnetic studies from Timna, we can assert the existence of simultaneous copper production at the archaeological Sites 30, 30a and 34. This gives further support to the claim of intense smelting in the central Timna Valley during the early Iron Age. Finally, this project demonstrates the potential of archaeomagnetic experiments to provide chronological insights, and their particular advantage in addressing pyrotechnology‐related cases.     

A Fresh Look at the Egyptian Environment of the Pharaonic Period

Abstract

The article deals with the territorial history of the southern steppe areas of the Levant in the period between ca. 1050–750 BCE. In the early days of the Iron Age, until the mid-9^th century BCE, parts of them, were ruled by local desert entities: in the late Iron I a Moabite polity and in the early Iron IIA and the early years of the late Iron IIA the Tel Masos-Beer-Sheba-Negev Highlands Highlands entity. This situation changed in the later years of the Iron IIA as a result of Damascus' rise to hegemony in the Levant. In the second half of the 9^th century BCE Judah, under Damascene domination, expanded for the first time into the Beer-Sheba Valley. In the first half of the eighth century BCE, with the revival of Assyrian power in the days of Adad-nirari III, Damascene authority was replaced by north Israelite domination in the south.     

THE FERTILE DESERT: AGRICULTURE AND COPPER INDUSTRY IN EARLY ISLAMIC ARAVA (ARABAH)

Abstract

The Arava is an arid region in the Southern Levant. Archaeological excavations and surveys in the area revealed dense settlement and sophisticated technologies from the eighth to ninth centuries—qanat water technology and copper production. Differences between the data of the middle and southern Arava suggest two separated economic systems. While the Southern Arava seems to be primarily an industrial area of copper that delivered the raw material to Ayla, the middle Arava was mainly agricultural and may be connected to trade routes. Studying the farming conditions of this arid area points to date palms as the main crop of the agricultural settlement. However, it is not yet clear where the Arava's produce was exported.     

New research and findings from Tell Sufan

Abstract

The article reviews archaeological surveys and excavations in the area of the Wadi Faynan, together with various dating proposals. In particular, the results so far published of the San Diego expedition under Thomas Levy and of the possible connection between Iron Age copper mining and the biblical King Solomon are considered, along with the necessity of utilizing evaluation of the material remains by conventional archaeological means (stratigraphy, ceramic typology) alongside laboratory analysis, and not the latter alone.     

清代“宣铜”名物考

"宣铜"一词在明清文献中多有记载,其涵义至少有两种以上。作者通过科学的无损检测,同时结合对清宫旧藏实物的分析,基本可以推定古籍和档案中多次出现的"宣铜"的质地应该是黄铜。"宣铜"器的样式多种多样,清朝器物可以分为炉、彝器和杂式三大类,其下又可以分成若干式。清朝"宣铜"器款识丰富,工艺风格独特。     

化学镀与电刷镀技术在鎏金铜器修复中的应用研究

为研究化学镀与电刷镀技术在鎏金铜器修复中的应用,使用扫描电镜、X射线衍射等测试方法对样品进行实验。结果发现在模拟补配材料的样品上镀覆效果良好,并对一件有残缺的鎏金铜器实施茬口清理、补配、化学镀、电刷镀等保护修复技术处理,完成一件器物独立配件的制备。修复后器物形态完整,外观和谐,再现了器物的美学价值。     

Hydrothermal fluid flow models of stratiform ore genesis in the McArthur Basin, Northern Territory, Australia

This paper explores the role of basin‐scale fluid migration in stratiform Pb–Zn ore formation in the southern McArthur Basin, Australia. Mathematical models are presented for coupled brine migration and heat transport in the basin. The models account for: (i) topographically driven flow (forced convection) during periods when parts of the McArthur Basin were subaerial and elevated above the central Batten Fault Zone; (ii) density‐driven flow (free convection) during periods when the basin was mostly submarine; and (iii) transient flows associated with fault rupture during periods of transpression. These hydrologic models help to compare and contrast a variety of hypotheses concerning deep fluid migration and the origin of base metal ores in the McArthur Basin. The numerical results exhibit a strong structural control on fluid flow caused by the north‐trending fault systems that characterize the Batten Fault Zone. As a result, fluids descend to depths of a few kilometers along the western side, migrate laterally to the east through the clastic and volcanic aquifers of the upper Tawallah and lowest McArthur Groups, and then ascend along the eastern side of the fault zone. This recharge–discharge pattern dominates all of the hydrogeologic models. The basin‐wide flow pattern suggests that Na–Ca–Cl brines acquired base metals in the deepest levels of the basin stratigraphy as the fluids migrated eastwards through the aquifer system. Upward flow was relatively rapid along the Emu Fault Zone, so much so that fluid temperatures likely approached 130°C in the muddy sediments near the sea floor due to upward flow and venting at the HYC (‘Here’s Your Chance'). Transient pulses of flow characterized periods of transpressional stress and subsequent faulting may have punctuated the basin history. Large‐scale free convection, however, characterized notably long periods of diagenesis and ore mineralization during the Proterozoic in the McArthur Basin.     

Reconstruction of smelting conditions during 16th- to 18th-century copper ore processing in the Kielce region (Old Polish Industrial District) based on slags from Miedziana Góra,Poland

This study presents the first reconstruction of the smelting conditions in 16th- to 18th-century smelters from Miedziana Góra (Holy Cross Mountains, Poland). Based on geochemical (inductively coupled plasma mass spectrometry/emission spectrometry, X-ray fluorescence) and mineralogical analysis (X-ray diffractometry, scanning electron microscopy, electron probe micro-analysis) of historical slags, their chemical/phase composition and the basic smelting parameters (temperature, melt viscosity, and oxygen fugacity) were determined. Due to the differences in chemical and phase composition, slags from different smelting stages have been distinguished: hypocrystalline slags (MG6) from speiss/matte production and glassy (MG1–MG5) from matte conversion. In glassy slags, pyroxenes, quartz/cristobalite grains, and aggregates composed of metallic Cu and PbO are dispersed in the glass. Hypocrystalline slags are composed of wollastonites, anorthites, and metallic Cu. The temperature range at which the slags were formed was from ~1100°C (solidus temperature) to 1150–1200°C (liquidus temperature). The silicate melt's viscosity was from log η = 1.19 to 4.42 Pa s (at 1100–1200°C). The higher viscosity of MG1–MG5 slags indicates that, unlike MG6 slags, they were not formed during gravity separation. Information about the phase composition made it possible to determine the oxygen fugacity in the range of log fO₂ = −4 to −12 atm. High oxygen fugacity indicates the oxidizing nature of the smelting process.