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A Paleoarchean impact spherule-bearing interval of the 763 m long International Continental Scientific Drilling Program (ICDP) drill core BARB5 from the lower Mapepe Formation of the Fig Tree Group, Barberton Mountain Land (South Africa) was investigated using nondestructive analytical techniques. The results of visual observation, infrared (IR) spectroscopic imaging, and micro-X-ray fluorescence (lXRF) of drill cores are presented. Petrographic and sedimentary features, as well as major and trace element compositions of lithologies from the micrometer to kilometer-scale, assisted in the localization and characterization of eight spherule-bearing intervals between 512.6 and 510.5 m depth. The spherule layers occur in a strongly deformed section between 517 and 503 m, and the rocks in the core above and below are clearly less disturbed. The lXRF element maps show that spherule layers have similar petrographic and geochemical characteristics but differences in (1) sorting of two types of spherules and (2) occurrence of primary minerals (Ni-Cr spinel and zircon). We favor a single impact scenario followed by postimpact reworking, and subsequent alteration. The spherule layers are Al2O3-rich and can be distinguished from the Al2O3-poor marine sediments by distinct Al-OH absorption features in the short wave infrared (SWIR) region of the electromagnetic spectrum. Infrared images can cover tens to hundreds of square meters of lithologies and, thus, may be used to search for Al-OH-rich spherule layers in Al2O3-poor sediments, such as Eoarchean metasediments, where the textural characteristics of the spherule layers are obscured by metamorphism.
A growing number of local energy conflicts around wind power and power-grid extensions are slowing down the deployment of the German Energiewende. In this paper, a local conflict on wind energy in the state of Baden-Württemberg is analysed in detail. In the little community of Engelsbrand, local opposition against a planned wind park was able to turn around a set of favourable a priori conditions, such as a supporting state government planning process, a local supporter group, a transparent planning process, including a majority vote pro wind energy, and a round table discussion. Distancing itself from the NIMBY-explanation (‘Not In My Back Yard’), the paper applies insights from discourse network analysis and micro-sociology in order to study the local conflict dynamics. Special attention is given to the resource mobilisation strategies of the opponents, including social networks, mass and social media use. The paper ends by drawing some general conclusions for the German Energiewende.