Metamorphism of the Lower Palaeozoic rocks of the Moffat district, southern Scotland, 1:50K Sheet 16W
Kemp, S.J.; Merriman, R.J.. 2004 Metamorphism of the Lower Palaeozoic rocks of the Moffat district, southern Scotland, 1:50K Sheet 16W. Nottingham, UK, British Geological Survey, 14pp. (IR/04/120) (Unpublished)Before downloading, please read NORA policies.
The pattern of regional metamorphism indicated by illite crystallinity has been used to interpret the tectonic and thermal history of the district around Moffat in southern Scotland. The recognised regional pattern, characterised by the sub-parallelism of isocrysts with strike, and by changes in grade across the strike-parallel, tract-bounding faults is not as obvious in the Moffat district as elsewhere. The accretionary burial pattern typically found in the Southern Uplands, whereby the oldest strata show a lower metamorphic grade than younger strata, is well-defined to the north of the district but difficult to discriminate in the south. Higher grade epizonal rocks to the west of the district may represent the extension of the Moniaive Shear Zone or the an area of higher strain representing upfaulted and exhumed ‘roots’ of the Southern Uplands. Epizonal rocks to the north are interpreted as a surface-expression of the aureole of the concealed Tweeddale batholith. The difference in metamorphic grade noted either side of the Upper Palaeozoic Moffat Basin suggests uplift and block faulting associated with basin development. The coincidence of late diagenetic grade tracts to the west of the Moffat Basin with a Bouguer anomaly indicates the presence of a thick body of relatively low density Lower Palaeozoic rocks.
|Item Type:||Report (UNSPECIFIED)|
|Programmes:||BGS Programmes > Geology and Landscape Northern|
|Additional Information:||This item has been internally reviewed but not externally peer-reviewed|
|Date made live:||20 Sep 2012 13:12|
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