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Pictorial Trip Report
5 August 2002.
Narssârssuk – pegmatite
outcrops
(Narsarsuaq)
A boat from Blue
Ice took us to the starting point for our hike.
Narssârssuk is a smaller (syenite) pegmatite in
the western part of the Igferfigssalik centre, related to a porphyritic
microsyenite intrusion. A few hundred meters away is the Nanna Pegmatite
(Narsaarsuup Qaava).
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Icebergs forming a semicircle around a moraine
under water (to the south of Narsarsuaq). Photo taken on
our way up to stop 1.
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In the morning we went ashore
where the arrow is and walked up to stop 1 and 2 (pegmatites)
and back in the afternoon. Stop 1 and 2 are both about 300 m above
sea level. They are at the foot of the highest summit in the area,
namely the mountain Illerfissalik (Burfjeld in Danish)(outside
the map area - to the right/east of the 2 stops) |
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Looking towards the west along the Eriksfjord. Narsaq is somewhere
behind the Nunasarnaq. (with Nunasarnaq Formation 350 m).
To the right (above Eriksfjord) The Eriksfjord Formation with
the Ilimmaasaq above ca.in the middle.
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Qooqqut.
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Igaliko Fjord and Igaliko Settlement seen from stop 2. Igaliko
is a settlement in the ancient see of Gardar. The ‘Gardar’
igneous province derives its name from the Diocese of Gardar. |
The Igaliko nepheline syenite complex (Gardar province intrusions)
covers an area of about 45 km2 between the fjords of Igaliko and Tunnulliarfiq
(Eriksfjord) to the west and the inland ice in the east.
The syenite complex has four clearly separated intrusion centres and
is one of the largest of its sort in the world. The mineral composition
is generally simple with alkali feldspar and alkali nepheline as the
main minerals, but in places the mineral composition has been changed
through assimilation of host rocks.
The relatively small outcrops of the Narssârssuk and Nana pegmatites
(stop 1 and 2) lie in the middle of the youngest syenite group.
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Leifite.
Coin diameter = 23 mm.
Narssârssuk is the type locality for this mineral
that was described in 1915 and named after Leif the Lucky,
son of Eric the Red, the discoverer of Greenland. |
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Nafertisite.
The Nanna Pegmatite is indeed yielding the world's best nafertisite.
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Heading back. (Photo by Roger baker) |
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