A review of the peculiar mineralogy of the "Norwegian coesite- ecologite province', with crystal-chemical, petrological, geochemical and geodynamical notes and an extensive bibliography

D. C. Smith

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174 Scopus citations

Abstract

The "Norwegian coesite-eclogite province', or "terrane', is defined as a fragmented infolded nappe of very high P (> 28 Kbar) coesite-eclogite (sub)facies rocks which outcrop in parts of the Western Gneiss Region (WGR) of southern Norway. Crystal-chemical and petrographical notes, supported by 55 photomicrographs, are given for each of 38 peculiar mineral compositions, structures or associations occurring in this province in "external' eclogites or retrogressed eclogites. The petrogenesis of each peculiar mineral is discussed in terms of principal factors involved. Textures of definite and of deduced coesite are described. Over- and under-pressure in microscale solid and fluid inclusions and on regional geological scales are briefly discussed. After an outline review of the geodynamical context of Norwegian eclogites, many controversial points are systematically discussed. The widely-promoted model of a single regional "in situ' eclogite-facies metamorphic event involving the subduction of the entire WGR and maximum P constrained to < 23 Kbar is refuted. The much-derided "foreign' model of "lithospheric interdigitation' is maintained and developed into a new model: the "FIF' (foreign/in situ/foreign) model. -from Author

Original languageEnglish
Pages (from-to)1-206
Number of pages206
JournalUnknown Journal
StatePublished - 1988
Externally publishedYes

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