The Geology of the Ballantrae- Ophiolite in Ayrshire, South-West-Scotland

including structural and provenance studies



The Ballantrae Complex is made up of Ordovician fault- bounded units of mainly basalts, associated sediments and serpentinites, which are ENE - WSW striking, steeply inclined and younging northwestward. It is interpreted as an ophiolite complex, which was obducted in Arenig times. The characteristic lithologies of an ophiolite are present, although a sheeted dyke sequence was never found.

The Lavas are water lain and mostly well pillowed. There is some evidence of shallow water eruptions, e.g. vesicular pillows, hyaloclastites, reddened horizons and well rounded volcanogenic clasts indicating an intertidal accumulation facies..

The complex is unconformably overlain by late Ordovician to early Silurian coarse grained neritic sediments which are derived

A) from the Ballantrae Complex itself

B) from an acidic magmatic complex,

and by fine grained pelagic sediments.

A very complex deformation history is evident throughout the whole complex.

The purpose of our studies is to reveal more information on the brittle and ductile deformation history and the provenance of the adjacent sediments in order to become famous, honoured, rich, beautiful and good.

Individual studies:

Dittmers, Klaus Strain analysis of the dynamothermal aureole which is associated with the northern serpentinite belt

George, Michael Provenance of volcanoclastics through XRF analysis

Mühlebach, Georg Ductile deformation analysis of the Ballantrae Complex

Thiel, Stefan Provenance of the sedimentary cover in comparison to the greywackes of the Southern Uplands A) geological B) geochemical

Vött, Ulrike Brittle deformation analysis of the Ballantrae Complex

Diplomanden-Doktoranden Seminar WS 97/98

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