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Stable isotope data from hypogene (i.e., below the line of weathering) iron oxides and gangue minerals from BIF-hosted iron ore deposits in Australia, South Africa, and Brazil have significantly assisted in constraining different hydrothermal fluid sources and fluid flow models during the upgrade of BIF to iron ore. The δ18O values on iron oxides from BIF and different paragenetic stages of enrichment display a consistent decrease from unenriched BIF (4–9‰) to as low as −10‰ for high-grade iron ore. This large shift in oxygen isotope values is interpreted as evidence for enormous incursion of ‘ancient’ meteoric water into fault and fracture zones at the time of iron enrichment during the Archean and Paleoproterozoic time. The δ18Ofluid values of paragenetically early iron oxides of > 4‰ suggest the involvement of magmatic fluids in greenstone belt-hosted Carajás-type iron ore deposits, and basinal brines in basin-hosted Hamersley-type deposits. In contrast, the paragenetically late stage iron oxides in the metamorphosed, basin hosted iron ore deposits of the Quadrilátero Ferrífero display δ18Ofluid values > 6‰. This reflects the renewed deep crustal, hypogene (metamorphic or magmatic) fluid influx. Carbon and oxygen isotope data on carbonates in BIF and hydrothermally altered iron ore indicate that carbon in the latter is not derived from BIF units, but represents either magmatic carbon in the case of the Carajás-type deposits or carbon within the underlying basin stratigraphy as in the case of the Hamersley-type iron deposits. The systematic decrease of δ18O values in iron oxides from the early to late paragenetic stages and from the distal to proximal alteration zone, including the ore zone, may be used as a geochemical vector. In this case, oxygen isotope analyses on iron oxides provide a potential exploration tool, particularly for targeting the extension of iron ore bodies or entirely concealed high-grade iron ore deposits, in which hematite/magnetite are frequently the only mineral that can be readily analysed.
Institutional Ethnography
(2022)
Rehabilitation aims to enable people with disabilities or who are likely to experience disability to participate fully in their daily lives through a set of interprofessional and multimodal measures. Yet, rehabilitation services are embedded within social and healthcare systems that shape what individuals, who are active within these systems, can and may have to do. This chapter introduces Institutional Ethnography, a critical method of inquiry, which aims to explicate what people actually do and experience and how their doings and experiences become organized within textually mediated social relations. For rehabilitation practice and research, Institutional Ethnography is a powerful method to delineate which concepts are dominating institutional practices and to explicate whether these concepts are comprehensive enough to serve not only institutional purposes but account for and respond to the realities of people’s daily lives.
Die wissenschaftlichen Disziplinen, die sich mittlerweile mit ‚Kindern‘ und ‚Kindheit(en)‘ befassen, sind zahlreich. So hat sich der Forschungsblick der letzten eineinhalb Dekaden sichtbar in die frühen Entwicklungsjahre verlagert bzw. dort intensiviert und ausdifferenziert. Von Kinderfreundlichkeit, Kinderrechten, Kindesschutz und Kindeswohl, kindlichem Wohlbefinden, von der Kommunikation mit Kindern ‚auf Augenhöhe‘, und vom Prinzip der Partizipation (welches Kindern eine Teilhabe an den sie betreffenden Entscheidungen zugesteht) ist allenthalben die Rede. In Anbetracht dieser Hypertrophierung des Begriffs ‚Kind(heit)‘ und scheinbaren Asymmetrie von frühen im Vergleich zu späteren Altersphasen wirken ‚Jugend‘ und ‚Jugendliche‘ weniger prominent. Der folgende Beitrag verfolgt das Ziel einer explorativen Spurensuche entlang der Demarkationslinie zwischen Kindheit und Jugend. Hierdurch soll zu einem dynamisch-wechselseitigen Verständnis dieser beiden Lebensphasen (im Gegensatz zur häufig eher kategorial-trennenden Positionierung) beigetragen werden. Neben wissenschaftshistorischen und legislativen Dynamiken der Altersmarkierung von Kindheit und Jugend werden zeitdiagnostische Aspekte sowie forschungsmethodologische Überlegungen präsentiert.
Vaterschaft
(2022)