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The Caledonide Geology of Scandinavia (Paperback, 1989)
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The Caledonide Geology of Scandinavia (Paperback, 1989)
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work on structural and stratigraphic relationships is presented
from various parts of the mountain belt. In the first paper of the
section, R. O. Greiling (Heidelberg) describes the Middle
Allochthon of Vasterbotten, northern Sweden, where tectonic windows
through the Upper Allochthon (Seve Nappe) show that the Middle
Allochthon has a similar lithostratigraphy to that of the Stalon
Nappe Complex of the eastern Caledonian margin but with a more
ductile deformation and metamorphosed to a higher grade following
thrust emplacement. These relations are explained by suggesting
that the window rocks were initially subducted beneath a colliding
western plate but were later accreted to the base of the western
plate and thrust with it. The thrust geometry of the windows,
described as antiformal stacks, agrees with this model. The Middle
Allochthon of the Caledonian margin in northern Sweden is described
by R. O. Greiling and R. Kumpulainen (Heidelberg and Stockholm) who
record two distinct metasedimentary units separated by a thick zone
of mylonites interpreted as a lateral thrust ramp. Turbidites in
the northern unit were derived from an unidentified igneous source
to the east and cannot be correlated with other sequences in the
Middle Allochthon. In another paper dealing with the northern
Swedish Caledonides, L. Hansen (Uppsala) describes down-to-the-west
normal faults cutting the autochthonous Cambrian sediments in the
tunnel sections of the Vietas Hydropower Station, but themselves
being truncated by the basal decollement of the Lower Allochthon.
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