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An alternative model for ultra-high pressure in the Svartberget Fe-Ti garnet-peridotite, Western Gneiss Region, Norway
 

Summary: An alternative model for ultra-high pressure in the Svartberget Fe-Ti
garnet-peridotite, Western Gneiss Region, Norway
JOHANNES C. VRIJMOED1,*, YURI Y. PODLADCHIKOV1
, TORGEIR B. ANDERSEN1
and EBBE H. HARTZ1,2
1
Physics of Geological Processes (PGP), University of Oslo, PO Box 1048, Blindern, 0316 Oslo, Norway
*Corresponding author, e-mail: j.c.vrijmoed@fys.uio.no
2
Aker Exploration AS, PO Box 580, Sentrum, 4003 Stavanger, Norway
Abstract: The previously reported ``Fe-Ti type'' garnet-peridotite is located in the northern part of the well known ultra-high pressure
(UHP) area of the Western Gneiss Region (WGR) in Norway. Primary spinel stable up to only 2.0 GPa at 800
C coexists with
Caledonian ultra-high pressure (4.0 GPa at 800
C) grt-cpx-opx-ol assemblages in the Svartberget garnet-peridotite. The body is cut
by a conjugate set of metasomatic fractures filled dominantly with diamond-bearing garnet-phlogopite-websterite (5.5 GPa at 800
C)
and garnetite. Single zircon U-Pb dating suggests metamorphic growth of zircon in the garnetite at 397.2 Æ 1.2 Ma, either coinciding
or predating an initial phase of leucosomes formation at 397­391 Ma. Field observations, major and trace elements, mineral-
chemistry, polyphase inclusions including microdiamond, coupled with 87

  

Source: Andersen, Torgeir Bjørge - Centre for Physics of Geological Processes & Department of Geosciences, Universitetet i Oslo

 

Collections: Geosciences