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Ulf Söderlund

Ulf Söderlund

Professor

Ulf Söderlund

Lu-Hf apatite geochronology of mafic cumulates: An example from a Fe-Ti mineralization at Smalands Taberg, southern Sweden

Författare

  • Daniel Larsson
  • Ulf Söderlund

Summary, in English

We have employed Lu-Hf apatite chronology to determine the age of a magnetite-rich melatroctolite in southern Sweden, known as the Smalands Taberg Fe-Ti ore deposit. The melatroctolite is poor in incompatible elements and minerals forming at more advanced stages of differentiation, which precludes the use of minerals (baddeleyite, zircon, titanite or apatite) commonly used for dating the emplacement of igneous rocks. Enclaves of leucogabbro in the melatroctolite have REE patterns parallel with the host melatroctolite and identical initial Hf and Nd isotope compositions. These characteristics are conclusive evidence for a common parental magma. The leucogabbro is a slightly more evolved facies that underwent limited fractionation of olivine and titanomagnetite; the two major mineral phases in the melatroctolite. Apatite and plagioclase, separated from the leucogabbro, plus a whole-rock sample define a Lu-Hf isochron with a slope corresponding to an age of 1204.3 +/- 1.8 Ma. This result is close to the lower age boundary previously reported for this magmatic event comprising dolerites, syenites and granites. The Lu-Hf apatite chronometer merits attention as a new tool in generating accurate and precise ages for igneous, silica-undersaturated rocks that may be difficult to date with traditional techniques.

Avdelning/ar

  • Berggrundsgeologi

Publiceringsår

2005

Språk

Engelska

Sidor

201-211

Publikation/Tidskrift/Serie

Chemical Geology

Volym

224

Issue

4

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Geology

Nyckelord

  • melatroctolite
  • Lu-Hf geochronology
  • apatite
  • Fe-Ti mineralization

Aktiv

Published

ISBN/ISSN/Övrigt

  • ISSN: 0009-2541