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Eklogitiska bergarter i Roan, Vestranden, Norge : en mineralinventering och texturstudie

Möller, Charlotte (1984) In Examensarbeten i geologi vid Lunds universitet
Department of Geology
Abstract
During reconnaissance field work in the westernmost part of Vestranden, Nord-Trøndelag, Norway, some eclogitic rocks were found (by Leif Johansson and Charlotte Möller). They are of interest, because until now, eclogites have not been found in this northern part of the Western Gneiss Region. It is important to consider these rocks in the evolutionary context of the entire Western Gneiss Region. This B.Sc. examination paper includes an inventory of minerals and textures, and brief comments on observed reactions.
The eclogitic bodies occur as lenses of varying size in a gneissic and migmatized countryrock, and consist of garnet, clinopyroxene and/or amphibole, and often kyanite. Clinopyroxenes are jadeite poor omphacites (<7,5 mole-% Jd)... (More)
During reconnaissance field work in the westernmost part of Vestranden, Nord-Trøndelag, Norway, some eclogitic rocks were found (by Leif Johansson and Charlotte Möller). They are of interest, because until now, eclogites have not been found in this northern part of the Western Gneiss Region. It is important to consider these rocks in the evolutionary context of the entire Western Gneiss Region. This B.Sc. examination paper includes an inventory of minerals and textures, and brief comments on observed reactions.
The eclogitic bodies occur as lenses of varying size in a gneissic and migmatized countryrock, and consist of garnet, clinopyroxene and/or amphibole, and often kyanite. Clinopyroxenes are jadeite poor omphacites (<7,5 mole-% Jd) with a high molar proportion of diopside. In most of the samples, the clinopyroxenes are not stable, but are rimmed by symplectitic orthopyroxene and plagioclase. The garnets fall into two groups: one with pyrope contents of 29-37 mole-%, the other with 40-58 mole-% pyrope. In some samples, garnets are zoned with an increasing pyrope content towards the rim. They are rimmed by very fine-grained symplectitic orthopyroxene, spinel and plagioclase. In the kyanite-bearing samples, the kyanite crystals always have a reaction rim of corundum and sapphirine, with an outer rim of granoblastic, strongly zoned plagioclase. Sapphirine forms beautiful rims around kyanite.
Observed reactions are typical of granulite facies. Are these reactions due to a temperature increase, or are they the products of an isothermal pressure drop during uplift of the Western Gneiss Region? (Less)
Please use this url to cite or link to this publication:
author
Möller, Charlotte
supervisor
organization
alternative title
Eclogitic rocks in Roan, Vestranden, Norway : an inventory of minerals and a textural studie
year
type
H1 - Master's Degree (One Year)
subject
keywords
Vestranden, Roan, eklogitiska bergarter, geografi, geologi, Norge
publication/series
Examensarbeten i geologi vid Lunds universitet
report number
2
language
Swedish
id
2371262
date added to LUP
2012-05-21 10:24:09
date last changed
2012-05-21 10:24:09
@misc{2371262,
  abstract     = {During reconnaissance field work in the westernmost part of Vestranden, Nord-Trøndelag, Norway, some eclogitic rocks were found (by Leif Johansson and Charlotte Möller). They are of interest, because until now, eclogites have not been found in this northern part of the Western Gneiss Region. It is important to consider these rocks in the evolutionary context of the entire Western Gneiss Region. This B.Sc. examination paper includes an inventory of minerals and textures, and brief comments on observed reactions.
The eclogitic bodies occur as lenses of varying size in a gneissic and migmatized countryrock, and consist of garnet, clinopyroxene and/or amphibole, and often kyanite. Clinopyroxenes are jadeite poor omphacites (<7,5 mole-% Jd) with a high molar proportion of diopside. In most of the samples, the clinopyroxenes are not stable, but are rimmed by symplectitic orthopyroxene and plagioclase. The garnets fall into two groups: one with pyrope contents of 29-37 mole-%, the other with 40-58 mole-% pyrope. In some samples, garnets are zoned with an increasing pyrope content towards the rim. They are rimmed by very fine-grained symplectitic orthopyroxene, spinel and plagioclase. In the kyanite-bearing samples, the kyanite crystals always have a reaction rim of corundum and sapphirine, with an outer rim of granoblastic, strongly zoned plagioclase. Sapphirine forms beautiful rims around kyanite.
Observed reactions are typical of granulite facies. Are these reactions due to a temperature increase, or are they the products of an isothermal pressure drop during uplift of the Western Gneiss Region?},
  author       = {Möller, Charlotte},
  keyword      = {Vestranden,Roan,eklogitiska bergarter,geografi,geologi,Norge},
  language     = {swe},
  note         = {Student Paper},
  series       = {Examensarbeten i geologi vid Lunds universitet},
  title        = {Eklogitiska bergarter i Roan, Vestranden, Norge : en mineralinventering och texturstudie},
  year         = {1984},
}