Abstract
Heavy-mineral and garnet compositions of stream sediments and HP–UHP basement rocks from the Western Gneiss Region, SW Norway
Highlights
Detrital heavy minerals from sediments provide insights into the geology of the entire catchment area
Opaque minerals and micas are not considered in the diagram (Fig. 5) to illustrate the total concentration of transparent heavy minerals (HM)
In the three study areas, most of the garnets are derived from higher-grade metamorphic rocks such as eclogites and granulites, because these rocks have a high content of garnet in contrast to the amphibolite-facies gneisses which mainly contain green calcic amphibole, epidote-group minerals and only locally garnets
Summary
Detrital heavy minerals from sediments provide insights into the geology of the entire catchment area. Several techniques exist to analyse different mineral grains and every single grain preserves information about the tectonic and erosional history of the source areas (e.g., Garzanti et al, 2009; von Eynatten et al, 2012). Numerous processes during the sedimentary cycle can affect the detrital grain signature (e.g., Morton & Hallsworth, 1999). It is important to learn more about these processes and to find ways to minimise potential bias. 2015: Heavy-mineral and garnet compositions of stream sediments and HP–UHP basement rocks from the Western Gneiss Region, SW Norway.
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