The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Anders Lindh

Anders Lindh

Professor emeritus

Anders Lindh

Minute-sized crystals pf HFSE minerals in evolved, fluorite-bering granite : an example from the Sörvik granite, central Sweden

Author

  • Anders Lindh

Summary, in English

SEM-EDS techniques are used to study minute-sized crystals of HFSE minerals in an evolved batch of fluorine-rich granite. The batch separated due to buoyancy from the bulk magma before fluid separation was reached. Fluorine acted as the main complexing agent in the magma, facilitating the transport of many elements. Enhanced concentrations of elements like Nb, Y, REE, Th and possibly Be gave the granite an accessory mineral composition similar to that of NYF pegmatite. Biotite was chloritized and often no remaining biotite can be identified. Frequent are two minerals from the aeschynite-euxenite-polycrase group. One is blocky and formed together with chlorite. It was replaced by an acicular variety, which continued to crystallize into the late hydrothermal stage. Bastnäsite and synchysite are also common in the granite. Both started crystallizing together with chlorite, but only synchysite can be followed into the late hydrothermal stage. Hingganite and gadolinite occur as inclusions in fluorite and chlorite. Galgenbergite formed as fracture-fillings. Some other rare minerals have merely been identified as accidental inclusions, but their identification is less certain. They include brenkite, fluocerite, fergusonite and possibly håleniusite. Chemical heterogeneities in the minerals point to incomplete equilibration

Department/s

  • Lithosphere and Biosphere Science

Publishing year

2012

Language

English

Pages

283-294

Publication/Series

GFF

Volume

134

Issue

4

Document type

Journal article

Publisher

Taylor & Francis

Topic

  • Geology

Keywords

  • Fluorite
  • HFSE-minerals
  • evolved granite
  • crystallization sequence
  • Sweden

Status

Published

ISBN/ISSN/Other

  • ISSN: 2000-0863