Webbläsaren som du använder stöds inte av denna webbplats. Alla versioner av Internet Explorer stöds inte längre, av oss eller Microsoft (läs mer här: * https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Var god och använd en modern webbläsare för att ta del av denna webbplats, som t.ex. nyaste versioner av Edge, Chrome, Firefox eller Safari osv.

Anders Lindh

Anders Lindh

Professor emeritus

Anders Lindh

Origin of chemically distinct granites in a composite intrusion in east-central Sweden: geochemical and geothermal constraints

Författare

  • Anders Lindh

Summary, in English

A few tens of millions of years after the intrusion of the Early Svecofennian (similar to1.87-1.85 Ma) granitoids in central Sweden, a renewed magmatic activity resulted in the emplacement of the Late Svecofennian granites, the tectonic setting of which remains obscure. S-type granites dominate this group, but both I-type and transitional granites are common. This study deals with one of these intrusions in east-central Sweden; a composite pluton that is insignificantly deformed and hosts both I- and S-type granites. One of the I-type granites shows a compositional trend from granodiorite to granite, which is uncommon among the Late Svecofennian granites. Major element and incompatible trace element compositions and epsilon(Nd) data show that two different sources, one igneous and one sedimentary, were involved. An important conclusion is that nearly coeval granites derived from different sources are found in close connection. The granites are suggested to have formed by partial melting in a thickened continental crust that was formed in an early stage of the Svecofennian event. Thermal models suggest that the slightly older, high-temperature I-type granite (granodiorite) was formed deeper in the crust than the S-type granite. The coexistence of essentially pure I- and S-type granites, rather than transitional mixtures, reflects the relative depths of the proposed sources and the varying thermal parameters of the lithologic units in the Svecofennian crust.

Avdelning/ar

  • Berggrundsgeologi

Publiceringsår

2005

Språk

Engelska

Sidor

249-266

Publikation/Tidskrift/Serie

Lithos

Volym

80

Issue

1-4

Dokumenttyp

Konferensbidrag

Förlag

Elsevier

Ämne

  • Geology

Nyckelord

  • modelling
  • I-type
  • thermal
  • magma modelling
  • geochemistry
  • S-type
  • granite

Conference name

Symposium on Granitic Systems

Conference date

2003-01-12 - 2003-01-14

Conference place

Helsinki, Finland

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0024-4937
  • ISSN: 1872-6143