Source and character of syntaxial hydrothermal calcite veins in Paleoproterozoic crystalline rocks revealed by fine‐scale investigations

Calcite veins in Paleoproterozoic granitoids on the Baltic Shield are the focus of this study. These veins are distinguished by their monomineralic character, unusual thickness and closeness to Neoproterozoic dolerite dykes and therefore have drawn attention. The aim of this study was to define the source of these veins and to unravel their isotopic and chemical nature by carrying out fine‐scale studies. Seven calcite veins covering a depth interval of 50–420 m below the ground surface and composed of breccias or crack‐sealed fillings typically expressing syntaxial growth were sampled and analysed for a variety of physicochemical variables: homogenization temperature (T_h) and salinity of fluid inclusions, and stable isotopes (⁸⁷Sr/⁸⁶Sr, ¹³C/¹²C, ¹⁸O/¹⁶O), trace‐element concentrations (Fe, Mn, Mg, Sr, rare earth elements) and cathodoluminescence (CL) of the solid phase. The fluid‐inclusion data show that the calcites were precipitated mainly from relatively low‐temperature (T_h = 73–106°C) brines (13.4–24.5 wt.% CaCl₂), and the ⁸⁷Sr/⁸⁶Sr is more radiogenic than expected for Rb‐poor minerals precipitated from Neoproterozoic fluids. These features, together with the distribution of δ¹³C and δ¹⁸O values, provide evidence that the calcite veins are not genetic with the nearby Neoproterozoic dolerite dykes, but are of Paleozoic age and were precipitated from warm brines expressing a rather large variability in salinity. Whereas the isotopic and chemical variables express rather constant average values among the individual veins, they vary considerably on fine‐scale across individual veins. This has implications for understanding processes causing calcite‐rich veins to form and capture trace metals in crystalline bedrock settings.     

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Status,Estate, or Profession?

This article focuses on how social stratification was performed in everyday practice in 1730s Sweden. By studying the titles people were given in the court material of three communities – Uppsala town, Lagunda härad, and Sala town with its silver mine – three factors defining social categorization can be identified: status, estate, and profession. Only people who rose above the commoners were entitled, which means that all titles denoted status. Some titles were shared by different social groups that had little in common, and therefore cannot be said to mark anything other than status. Other titles were exclusive to definable groups. Among those, some were given to groups whose exclusivity was based on legal and fiscal privileges, rather than education or competence. They were simply feudal corporations, or estates. In other groups – all defined by occupations – the members had completed specialist education that included formal exams. In those, social stratification was the result of professionalism.     

Multiple myeloma in an early medieval skeleton

Detailed studies on neoplasms in prehistoric populations are rare. Each well-documented case can therefore add to our knowledge. In former times, palaeopathology could present only tentative diagnoses in the case of tumours. Today, modern diagnostic methods and a comparison with established cases make exact evaluations and their verification possible. During our study it became obvious that criteria for the diagnosis of recent tumours can be used as a guide. In this paper we present the most important findings of a malignant primary bone tumour (multiple myeloma) in an early medieval skeleton and its differential diagnoses. Even in the absence of histological findings, the remaining criteria (X-ray, age, localization, macroscopic features) permit the diagnosis of multiple myeloma to be made with some certainty.