This GeoGuide provides an overview of the geology of Alnö combined with an up-to-date field
itinerary. Covering all major geological aspects it offers an essential summary of Alnö and
its intriguing magmatic rocks in a compact form suitable for field excursions and home study
alike. As one of the type localities for carbonatite the late Proterozoic Alnö ring complex
has been a crucial site for carbonatite-related research (next to the Fen complex in Norway)
and provided one of the earliest test beds for this unique group of igneous rocks. Five
geological excursions introduce the visitor to the most rewarding outcrops including detailed
descriptions and a wealth of high-quality colour photographs. The excursions are complemented
by a detailed review of the history of scientific investigation on Alnö and in particular a
catalogue of exotic and common minerals associated with the complex's carbonatitic and alkaline
silicate rocks. Finally a summary of its trace element and isotope geochemistry as well as a
brief outlook on Alnö's potential as a future source of Rare Earth Elements (REEs) completes
the book.
