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1
Introduction to Metamorphic Textures and Microstructures
7.4 Pyroxenes replaced by amphibole (actinolitic hornblende) as part of the
process of uralitisation in meta- igneous rocks within a Precambrian basement
window. Troms, Norway. Scale bar = 125 //rn (XPL). The surrounding minerals
are ...
A. J. Barker, A. J. Barker (Ph. D.), 1998
2
New Zealand Journal of Geology and Geophysics
Reaction (la) is usually ascribed to late magmatic alteration ("uralitisation").
Because in the present rocks the two types of texture are demon- strably
transitional, with pale green amphibole possibly an intermediate product of
reaction (lb), the ...
3
Introduction to Metamorphic Textures and Microstructures
7.4 Pyroxenes replaced by amphibole (actinolitic hornblende) as part of the
process of uralitisation in metaigneous rocks within a Precambrian basement
window. Troms, Norway. Scale bar = surrounding minerals are plagioclase and
minor ...
Barker, A.J. (Department of Geology, University of Southampton), Barker a J (Department of Geology University of Southampton), 2013
4
Journal of the Royal Society of New Zealand
A similar alteration sequence has been described by Oliver (1951), who showed
that uralitisation was deuteric or late magmatic, and that the earlier amphibole
formed from orthopyroxene takes up the bases released by later clinopyroxene ...
5
New Zealand Journal of Geology and Geophysics
Uralitisation of pyroxenes is widespread and there is a tendency for the degree of
uralitisation to increase eastward. The coarsegrained pyroxene diorite was not
observed in contact with the rocks of the Waipapa Group, but the presence of ...
6
Journal of the Royal Society of Western Australia
The rocks vary from quartz-free dolerites made up of slightly brownish pyroxene
and plagioclase (AbjAii|) with apatite and ilmenite us accessories, through quartz
dolerites which usually show considerable uralitisation of the pyroxene, to more ...
Most of the dyke rocks have the typical doleritic texture, except where it has been
obscured by uralitisation of the pyroxene. The basic intrusives are divisible into
two main types : — (a) Dolerites. — The dolorites form the major division of the ...
Uralitisation both marginally and along cleavage planes is common, actinolite
often being the replacing amphibole. Actinolite, with a fibrous structure, also
occurs within the rock as a secondary mineral. It has a pleochroism scheme a =
pale ...
9
Geographische en geologische mededeelingen: publicaties uit ...
In the volcanic rocks uralitisation is the most common feature. It starts with the
augites, but in some cases nearly the whole rock is uralitised. An elaborate
description of the mineralogical aspects of the process can be found in Thiadens
(7, p.
10
The Petrology of Graham Land
Uralitisation both marginally and along cleavage planes is common, actinolite
often being the replacing amphibole. Actinolite, with a fibrous structure, also
occurs within the rock as a secondary mineral. It has a pleochroism scheme 01 =
pale ...
