Hornblenden aus Eklogiten und Amphiboliten der südlichen Koralpe

Inhalt Hornblenden aus Eklogiten und Amphiboliten der südlichen Koralpe werden chemisch und optisch untersucht; außerdem sind die Gitterkonstanten der Hornblenden bestimmt worden.Herrn Prof. Dr.K. H. Scheumann in Verehrung zum 80. Geburtstag gewidmet.     

A survey to determine levels of chlorinated pesticides and PCBs in mussels and seawater from the Mid-Black Sea Coast of Turkey

A mussel and seawater monitoring survey was conducted at six sampling points between Yalikoy (Ordu) and Sinop in 1999-2000 along the Mid-Black Sea Coast of Turkey in order to assess concentrations of organochlorine pesticides (OCs) and polychlorinated biphenyls (PCBs). Chlorinated pesticides and PCBs were measured in the mussel Mytilus Galloprovincialis and in seawater. In the mussel samples, the most common pollutants in terms of average concentration per g of wet weight (ww), were DDT (max. 1800 pg/gww, min. 240 pg/gww) and its metabolites DDD (max. 5400 pg/gww, min. 240 pg/gww) and DDE (max. 2800 pg/gww, min. 70 pg/gww). Also, dieldrin, heptachlor and HCB were notable contaminants in the mussel samples. PCBs were determined in none of the biota or seawater samples. The concentrations of the OCs and PCBs in mussels were higher in coastal areas receiving river discharges and close to the largest city of the region, Samsun (especially in sampling points in the harbour area). The well-known long persistence of DDTs and other chlorinated compounds was confirmed by residues of these pollutants measured in mussels. On the other hand, even though the usage of such kind of persistent compounds in Turkey was banned, there may still be illegal usage and it is not certain whether the application of these compounds did end in the region.     

Carbonates and Sulfates in CI Chondrites: Formation by Aqueous Activity on the Parent Body

Abstract— Compositions and morphologies of dolomites, breunnerites, Ca-carbonates, Ca-sulfates and Mg, Ni, Na-sulfates, and their petrologic interrelations, in four CI chondrites are consistent with their having been formed by aqueous activity on the CI parent body. Radiochronometric data indicate that this activity took place very early in Solar-System history. No evidence for original (“primitive”) condensates seems to be present. However, alteration apparently took place without change in bulk meteorite composition.     

Re-evaluation of the petrogenesis of the Proterozoic Jabiluka unconformity-related uranium deposit, Northern Territory, Australia

The world class Jabiluka unconformity-related uranium deposit in the Alligator Rivers Uranium Field, Australia, contains >163,000 tons of contained U₃O₈. Mineralization is hosted by shallow-to-steeply dipping basement rocks comprising graphitic units of chlorite–biotite–muscovite schist. These rocks are overlain by flat-lying coarse-grained sandstones belonging to the Kombolgie Subgroup. The deposit was discovered in 1971, but has never been mined. The construction of an 1,150 m decline into the upper eastern sector of the Jabiluka II deposit combined with closely spaced underground drilling in 1998 and 1999 allowed mapping and sampling from underground for the first time. Structural mapping, drill core logging and petrographic studies on polished thin sections established a detailed paragenesis that provided the framework for subsequent electron microprobe and X-ray diffraction, fluid inclusion, and O–H, U–Pb and ⁴⁰Ar/³⁹Ar isotope analysis. Uranium mineralization is structurally controlled within semi-brittle shears that are sub-conformable to the basement stratigraphy, and breccias that are developed within the hinge zone of fault-related folds adjacent to the shears. Uraninite is intimately associated with chlorite, sericite, hematite ± quartz. Electron microprobe and X-ray diffraction analysis of syn-ore illite and chlorite indicates a mineralization temperature of 200°C. Pre- and syn-ore minerals extracted from the Kombolgie Subgroup overlying the deposit and syn-ore alteration minerals in the Cahill Formation have δ¹⁸O_fluid and δD _fluid values of 4.0±3.7 and −27±17‰, respectively. These values are indistinguishable from illite separates extracted from diagenetic aquifers in the Kombolgie Subgroup up to 70 km to the south and east of the deposit and believed to be the source of the uraniferous fluid. New fluid inclusion microthermometry data reveal that the mineralising brine was saline, but not saturated. U–Pb and ²⁰⁷Pb/²⁰⁶Pb ratios of uraninite by laser-ablation ICP-MS suggest that massive uraninite first precipitated at ca. 1,680 Ma, which is coincident with the timing of brine migration out from the Kombolgie Subgroup as indicated by ⁴⁰Ar/³⁹Ar ages of 1,683±11 Ma from sandstone-hosted illite. Unmineralized breccias cemeted by chlorite, quartz and sericite cross-cut the mineralized breccias and are in turn cut by straight-sided, high-angle veins of drusy quartz, sulphide and dolomite. U–Pb and ²⁰⁷Pb/²⁰⁶Pb ratios combined with fluid inclusion and stable isotope data indicate that these post-ore minerals formed when mixing between two fluids occurred sometime between ca. 1,450 and 550 Ma. Distinct ²⁰⁷Pb/²⁰⁶Pb age populations occur at ca. 1,302±37, 1,191±27 and 802±57 Ma, which respectively correlate with the intrusion of the Maningkorrirr/Mudginberri phonolitic dykes and the Derim Derim Dolerite between 1,370 and 1,316 Ma, the amalgamation of Australia and Laurentia during the Grenville Orogen at ca. 1,140 Ma, and the break-up of Rodinia between 1,000 and 750 Ma.     

Retrieval of P–T information from shear zones: thermobarometric consequences of changes in plagioclase deformation mechanisms

Changes in deformation mechanism coupled with spatial and temporal variations in reaction rates can result in preservation of disequilibrium mineral compositions in rocks affected by synmetamorphic shearing. Thermobarometric calculations on such rocks may thus yield meaningless results. We use Garbenschiefer samples from a shear zone in the Eastern Alps to study the effects of different deformational processes on calculated pressures and temperatures in samples that experienced the same overall PTt history. We focus on plagioclase, which accommodates strain by a variety of deformation mechanisms and is a key mineral in many thermobarometers. Plagioclase that deformed largely via dislocation creep mechanisms shows concentric chemical zoning, whereas plagioclase that experienced dissolution-precipitation creep preserves complex zoning. Rim compositions in the latter domains are not necessarily the youngest compositions, nor did they typically equilibrate with other phases in the assemblage. The timing of hornblende breakdown reactions relative to changes in plagioclase deformation mechanism also affected chemical zoning. Samples that escaped shear strain while near the thermal maximum yield internally consistent thermobarometric results, whereas samples that experienced shearing near the thermal maximum yield scattered results. Some of the variability in the results likely represents real differences in the P–T conditions at which equilibration occurred during deformation. However, much of the variability represents spurious results obtained by pairing mineral compositions that were never in equilibrium with one another. Extraction of useful P–T information from samples that experienced synmetamorphic deformation requires careful documentation of the relationships between deformation mechanisms and chemical zoning in order to select appropriate mineral compositions for thermobarometric calculations.Electronic Supplementary Material Supplementary material is available for this article at and is accessible for authorized users.     

Exploring the Tourism Experience of Beginner Skiers in the Emerging Ski Market

The skiing economy is a typical experience economy, so understanding the experience of ski tourists is essential to the development of the destination. To enrich the tourism experience research in the emerging ski market, this paper studies the 7118 online reviews of beginner skiers by selecting the main ski resorts in China as a case study. The content analysis method and sentiment analysis based on the domain lexicon and custom rules are combined to explore the perception characteristics of the beginners from the two aspects of experience dimension and experience satisfaction. Three main results were found. (1) The five main dimensions that affect the ski tourism experience of beginners are interaction perception, price perception, reputation perception, risk perception and functional perception. (2) For beginners, skiing is the primary purpose of tourism instead of being the critical factor of the positive reviews. They pay more attention to the pleasure produced by interpersonal interactions. (3) From 2014/2015 ski season to 2010/2021 ski season, the positive sentiment of beginners had no obvious change, while the negative sentiment showed a continuous downward trend, and the negative sentiment was mainly distributed among reviews on price, low temperature and service. This paper not only expands the research perspective of ski tourism, but also provides managerial inspiration for ski destinations interested in attracting beginners from the emerging ski markets.     

An Eruv for St Ives? Religion,identity, place and conflict on the Sydney north shore

Religious identity, when marked by physical changes to urban landscapes, has been a cause of tension and conflict in many cities. In the Sydney suburb of St Ives, an attempt to create an eruv, a symbolic and only partly physical boundary around orthodox Jewish space, was vigorously opposed and eventually defeated through the planning system. The religious and physical significance of the eruv resulted in diverse rationales of opposition, centred on the physical and environmental impact, the conceptual nature of boundaries and the role of religion and ‘modernity’ in everyday suburban life. The place of an eruv was opposed with reference to spatial imaginaries of the nation, the suburb and the secular public, as religion and worship intersected with the politics of urban citizenship and belonging. Each of these spatial imaginaries was constructed by opponents in such a way as to deny a place for an eruv in St Ives, and reinforced through the application of planning instruments which eventually refused permission for an eruv. To many residents, public space was seen to be at risk, raising complex questions over amenity, the politics and perception of difference and what is in or out of place. The planning framework adjudicating such development proposals must transcend such imaginaries in the production of public spaces in multicultural cities.