Abstract
The formation of dikes in southwest Jordan took place during the late Proterozoic and represents the subsequent magmatic activity of the Pan-African orogeny. Dikes studied in detail include a zoned, multiple, composite dike of rhyolitic—trachytic and latitic composition, an andesitic dike and two devitrified rhyolitic dikes. High-level (near-surface) dikes are characterized by an extreme potassium metasomatism, which is caused by pressure effects. The shallower the intrusion the more intensive will be the potassium metasomatism. Some dikes display anomalously high copper concentrations. The copper is originally incorporated in silicates and has been enriched along flow lines and vesicules by autometasomatism. The formation of secondary copper minerals (e.g., cuprite, malachite, chrysocolla) can be considered as contemporaneous with the solidification of the congealing rhyolitic—trachytic melt.
Published Version
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