Red calcite: an indicator of paleo‐karst systems associated with bauxitic unconformities

A unique red calcite generation, which fills fractures/cavities, is hosted by Mesozoic carbonates in the Transdanubian Range, Hungary. Solid inclusions are located along growth zones of calcite. Hematite, the most abundant solid inclusion, gives the red colour of it. Outcrop‐scale geometry, mineralogical features and detrital mineral assemblage (hematite, gibbsite, goethite, kaolinite, smectite, illite, Cr‐spinel, monazite, xenotime, zircon, apatite and Ti‐oxide) of calcite precipitates suggest strong correlation between the calcite and nearby karst bauxite deposits. Fluid inclusion petrography and microthermometry (T < 50°C; salinity from 0 to 0.17 NaCl eq. w%) of primary fluid inclusions, and the stable isotope trend of the calcite, following the meteoric water line, clearly indicate vadose and phreatic meteoric origin in a near‐surface karst system. The late Cretaceous to mid‐Eocene unconformity‐related cavity‐filling deposits occur close to the surface; indicating that the most recent Quaternary exhumation re‐exposed those surfaces that existed at the time of calcite mineralization. Thus, red calcite precipitates are interpreted as being speleothems, vestiges of the subterranean part of the pre‐Middle Eocene karst. The infiltrated, fine bauxite particles enclosed by the calcite are the witnesses of the once areally extensive pre‐Middle Eocene bauxitic blanket that became partially eroded by the time of the deposition of the cover beds. Red calcite when found in core samples may provide good evidence on bauxite formation associated with the overlying unconformity, even if it was later removed by erosion. Therefore, presence or absence of red calcite may be used as distinguishing criteria between karst episodes with or without bauxite formation.     

Makaynûn and its territory: the formation of an urban centre during the South Arabian period in the Hadramawt

Work at the site of Makaynûn in eastern Hadramawt (Yemen) and surrounding territory has yielded information on ancient settlement patterns in southern Arabia. This small regional centre lay within an area marked out by a network of seasonal flood‐water cultivation systems that irrigated agricultural areas. Each system was associated with one or more villages that were contemporary with the central site. As well as providing a communal refuge, the central site contained religious buildings, dwellings and doubtless the residence of the local elite, within the shelter of a defensive enclosure. This territory was overlain by a symbolic geography defined by the location of the sanctuaries and cemeteries of the Makaynûn community. This model of settlement was repeated all along the valley, where comparable systems were found at the mouths of the main tributary valleys.     

Gone to smelt iron in Courland: technology transfer in the development of an early modern industry

SUMMARY: In the Duchy of Courland and Semigallia, corresponding to the southern and western parts of present-day Latvia, an iron industry based on blast-furnace technology, mainly using local bog iron ore, existed in the 17th and 18th centuries. Transfer of knowledge and skill through the recruitment of specialists from other countries of Europe was crucial to the development of this industry; technology was also re-exported to Russia and elsewhere. Recent archaeological and archaeometallurgical investigations supplement the written evidence, highlighting the specific local conditions that influenced the development of ferrous metalworking here in the early modern period.     

Bruit aérien et équité environnementale dans les quatre plus grandes métropoles canadiennes

Previous environmental equity studies have examined the spatial distribution of aircraft noise across cities. Their findings show that, in several cities, visible minorities and low-income populations are most affected by aircraft noise. In contrast, one study concludes that well-off populations are the most affected. These contradictory findings support the use of a comparative approach for several cities. The aim of this study is twofold. First, we want to identify if there are groups in the population that are in a situation of inequity to aircraft noise exposure in Toronto, Montréal, Vancouver, and Calgary. Then, we want to check if the exposure to the aircraft noise of the different groups varies significantly from one metropolis to another. We use the recommended noise exposure contour maps in Canada: the Noise Exposure Forecasts. Next, four variables are extracted from the 2016 Statistics Canada census at a fine-scale level (dissemination areas): that is, the percentages of low-income, visible minorities, 0- to 15-year-old, and 65-year-old and over populations. The results of a mixed effects logistic regression model show that environmental inequities in terms of exposure to aircraft noise for the four population groups are not consistent from city to city.     

Identification of Pottery‐Forming Techniques using Quantitative Analysis of the Orientation of Inclusions and Voids in Thin Sections

The relationship between forming techniques and orientation of the components of ceramic materials in the context of pottery technology has long been recognized and used for identification of the techniques employed to create archaeological ceramics. The alignment of inclusions is usually characterized by qualitative categories or ordinal scales. This paper evaluates the potential of quantitative orientation analysis for identification of pottery‐forming techniques. A collection of experimental pottery formed using five forming techniques and combined techniques was analysed. The forming techniques were characterized by the intervals of the mean direction and the circular standard deviations of the orientation of the major axes of the ellipses equivalent to the objects representing random sections of inclusions and voids. The most informative criteria for the identification of pottery techniques are the circular standard deviation of the inclusion/void orientations in the core area of the vessel wall in a perpendicular thin section and the mean direction in a tangential section.     

The political map of Arabia and the Middle East in the third century AD revealed by a Sabaean inscription

An inscription in Sabaic, recently discovered on the site of Jabal Riyām (Yemen), gives an account of a journey—probably a diplomatic mission—carried out by a Sabaean dignitary on behalf of the rulers of the tribe of ?umlān. He listed the territories he passed through in western and northern Arabia and in the Middle East, up to Palmyra and Mesopotamia. This text, assumed to date back to the third century AD (probably c.260–280), provides a unique picture of the political forces in the area and throws new light on the regional map of the time.     

The Special Relationship Transformed. The Canada–Quebec–France Triangle after de Gaulle

ABSTRACT

Because of France’s unique role in Quebec’s international relations, any study of Quebec’s emergence on the international scene necessarily involves an analysis of this relationship. This article proposes an examination of Canada–France–Quebec relations in the decades following de Gaulle’s resignation in 1969. Several scholars focus on France’s implicit support for Quebec independence, considering that to be the essential ingredient of their “special relationship,” whereas I demonstrate that the foregoing interpretation overlooks the fact that France began to withdraw from the Canadian internal debate soon after de Gaulle’s resignation. During the last forty years, France’s abstention from interfering in Canadian internal affairs enabled both the flourishing of Quebec diplomacy and the deepening of the France–Quebec relationship.     

Technical Note: Practical Challenges Facing the Selection of Conditional Spectrum-Compatible Accelerograms

There are various possibilities for the selection and scaling of ground motions for advanced seismic assessment of buildings using nonlinear response-history analyses. As part of an on-going project looking at building-specific loss assessment in Italy, this article highlights a number of challenges currently facing the use of conditional spectra for ground motion selection in practice, essentially related to the limited amount of seismic hazard information that is publicly available. To illustrate the points being made, the challenges faced when trying to develop conditional spectra and select spectrum-compatible accelerograms for a rock site in Napoli, Italy, are described and the seismic assessment results obtained for a number of reinforced concrete wall structures are presented. Aside from providing practitioners with an appreciation of the potential difficulty associated with using conditional spectra for record selection, this technical note should also motivate national authorities to provide more background information on national seismic hazard data and detailed guidance for record selection.