Ductile fault rocks and metamorphic zonation in the Dalradian of the Highland Border SW of Stonehaven, Kincardineshire

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doi: 10.1144/sjg33010083
Authors:Phillips, E. R.; Auton, C. A.
Author Affiliations:Primary:
British Geological Survey, Edinburgh, United Kingdom
Volume Title:Scottish Journal of Geology
Source:Scottish Journal of Geology, Vol.33(Part 1), p.83-93. Publisher: Scottish Academic Press, Edinburgh, United Kingdom. ISSN: 0036-9276
Publication Date:1997
Note:In English. 34 refs.; illus., incl. 2 tables, geol. sketch map
Summary:High strain zones, characterized by shear fabrics and mylonites, have been identified within lower amphibolite-grade, coarse granular metasandstones of the Glen Lethnot Grit Formation of the Southern Highland Group (Dalradian) along the Highland Border, south-west of Stonehaven. The rocks comprise part of a polydeformed, regionally metamorphosed, Neoproterozoic sequence, bounded to the north by the post-orogenic Mount Battock Granite (Late Caledonian) and to the south-east by the Highland Boundary Fault Zone. Early regional D1 and D2 structures have been rotated by a major monoform, the Highland Border Downbend (D4), to produce a steeply dipping, downward facing succession. The mylonitic metasandstones contain a variety of kinematic indicators, including asymmetrical pressure shadows, S-C fabrics, shear bands and an extensional crenulation cleavage, which yield to a sense of shear of top-towards-the SE (present structural position). Regional syn- to post-D2 metamorphism resulted in the development of prograde pelitic mineral assemblages which overgrow earlier D1 structures. Mylonitic fabrics within the high strain zones, developed during D2, both deform and are also overgrown by syn- to post-kinematic biotite porphyroblasts. The high strain zones may represent part of a major ductile structure active during the Dalradian D2-D3 tectonothermal event, which contributed to the development of strong metamorphic gradients and narrowing of mineral assemblage zones within the Highland Border.
Subjects:Amphibolite facies; Dalradian; Deformation; Ductile deformation; Facies; Foliation; Kinematics; Metamorphic rocks; Metamorphism; Metasandstone; Metasedimentary rocks; Mineral assemblages; Mylonites; Neoproterozoic; Polymetamorphism; Precambrian; Prograde metamorphism; Proterozoic; Slip cleavage; Strain; Structural analysis; Upper Precambrian; Zoning; Europe; Great Britain; Scotland; United Kingdom; Western Europe; Fetteresso Forest; Grampian region Scotland; Kincardineshire Scotland; Stonehaven Scotland
Coordinates:N565000 N570000 W0021500 W0021500
Abstract Numbers:97M/4460
Record ID:1997059815
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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