'Institute of Geological Sciences of the National Academy of Sciences of Ukraine'
Abstract
Serpentinite bodies at the Highland Boundary in
the Loch Lomond and Aberfoyle areas are
extensively altered to magnesite-quartz and
ferroan-dolomite-quartz rocks. Silicification was
probably initiated before conversion to carbonate.
Relict textures indicate that the serpentinites were
derived from peridotitic precursors, but one
unaltered ultrabasic sample comprises mainly
chromian diopside. Chromite geochemistry and
hornblende-schist mineralogy rein force the ophiolitic
character of the serpentinite-spilite-blackshale-
chcrt assemblage of the Highland Border.
Magnetic and VLF traverses across the Highland
Boundary fracture-zone near Helensburgh
identified several anomalous zones. One may be
due to a concealed serpentinitic sheet.
The most mineralised serpentinite body
showed chromium values in the range 1000 to
3035 ppm. Such concentrations arc not encouraging
for the small serpentinites at Loch Lomond
and Aberfoyle, but may be significant regarding
larger serpentinites elsewhere at the Highland
Border
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