The Palaeogene Bracken Bay–Straiton dyke: composition and controls on intrusion
R. MacDonald
B. Bagiński
D. A. MacInnes
J. C. MacGillivray
D. J. Fettes
10.6084/m9.figshare.3453692.v1
https://geolsoc.figshare.com/articles/dataset/The_Palaeogene_Bracken_Bay_Straiton_dyke_composition_and_controls_on_intrusion/3453692
<p>The Bracken Bay–Straiton dyke, a member of the Palaeogene Mull dyke swarm, is one of the Solitary dykes of southern Scotland
and northern England recognized by Geikie (1897). It shows a remarkable (unique?) change of strike direction, deviating from
the regional NW–SE trend to propagate along the Southern Upland Fault for 16 km before apparently resuming its southeasterly
course in the Southern Uplands. The dyke is a clinopyroxene–plagioclase–phyric quartz tholeiite, showing little petrographic
variation along strike. However, geochemical data indicate that the dyke segment south of the Southern Upland Fault is not
comagmatic with the main dyke; it is here distinguished as the Kello Water dyke. The reason for the dyke’s deviation at the
fault is uncertain but may be related to a significant role for crustal heterogeneities, particularly Caledonian fractures
which had earlier been utilized by the Late Carboniferous quartz dolerite dyke swarm.
</p>
2016-06-21 11:37:09
southeasterly course
geochemical data
dyke segment
Southern Upland Fault
Palaeogene Mull dyke swarm
Caledonian fractures
Kello Water dyke
NW
strike direction
crustal heterogeneities
Solitary dykes
Carboniferous quartz dolerite dyke swarm
Southern Uplands
petrographic variation
Geology