Palaeo-stress estimates in the Moine Thrust Zone, Eriboll, Scotland

Nature ◽  
1979 ◽  
Vol 280 (5719) ◽  
pp. 222-223 ◽  
Author(s):  
S. WHITE
Keyword(s):  
Thrust Zone ◽  
Moine Thrust Zone

Terranes

1992 ◽  
Vol 13 (1) ◽  
pp. 1-4 ◽  
Author(s):  
B. J. Bluck ◽  
W. Gibbons ◽  
J. K. Ingham
Keyword(s):  
Hanging Wall ◽  
Fault System ◽  
Upper Proterozoic ◽  
Lower Proterozoic ◽  
Central Highland ◽  
Thrust Zone ◽  
Lower Palaeozoic ◽  
Moine Thrust Zone ◽  
Shallow Marine Sediments ◽  
Northern Highlands

AbstractThe Precambrian and Lower Palaeozoic foundations of the British Isles may be viewed as a series of suspect terranes whose exposed boundaries are prominent fault systems of various kinds, each with an unproven amount of displacement. There are indications that they accreted to their present configuration between late Precambrian and Carboniferous times. From north to south they are as follows.In northwest Scotland the Hebridean terrane (Laurentian craton in the foreland of the Caledonian Orogen) comprises an Archaean and Lower Proterozoic gneissose basement (Lewisian) overlain by an undeformed cover of Upper Proterozoic red beds and Cambrian to early mid Ordovician shallow marine sediments. The terrane is cut by the Outer Isles Thrust, a rejuvenated Proterozoic structure, and is bounded to the southeast by the Moine Thrust zone, within the hanging wall of which lies a Proterozoic metamorphic complex (Moine Supergroup) which constitutes the Northern Highlands terrane. The Moine Thrust zone represents an essentially orthogonal closure of perhaps 100 km which took place during Ordovician-Silurian times (Elliott & Johnson 1980). The Northern Highlands terrane records both Precambrian and late Ordovician to Silurian tectonometamorphic events (Dewey & Pankhurst 1970) and linkage with the Hebridean terrane is provided by slices of reworked Lewisian basement within the Moine Supergroup (Watson 1983).To the southwest of the Great Glen-Walls Boundary Fault system lies the Central Highlands (Grampian) terrane, an area dominated by the late Proterozoic Dalradian Supergroup which is underlain by a gneissic complex (Central Highland Granulites) that has been variously interpreted as either older

Cataclastic deformation of quartzite in the moine thrust zone

1986 ◽  
Vol 8 (6) ◽  
pp. 669-681 ◽  
Author(s):  
T.G Blenkinsop ◽  
E.H Rutter
Keyword(s):  
Thrust Zone ◽  
Moine Thrust Zone

scholarly journals Fault Rocks of the Moine Thrust Zone: A Guide to Their Nomenclature

1982 ◽  
Vol 4 (4) ◽  
pp. 211-221 ◽  
Author(s):  
S. White
Keyword(s):  
Shear Strain ◽  
Country Rock ◽  
Fault Zones ◽  
Fault Rocks ◽  
Fine Grained ◽  
Fine Grain ◽  
Simple Set ◽  
Thrust Zone ◽  
Moine Thrust Zone

The aim of this article is to extract from the existing literature a consistent nomenclature that can be used in the description of coherent fault rocks. The nomenclature is dealt with in this paper. Typical microstructures illustrating each is presented in a later paper (White et al ., 1982). It will be shown that a simple set of nomenclature can be extracted from the literature, so long as genetic connotations are kept to a minimum. The sequence, with increasing shear strain is country rock–protomylonite–blastomylonite–mylonite–ultramylonite if the rock has a well developed foliation; country rock–protocataclasite–cataclasite–ultracataclasite if it is without a foliation.It is emphasized that a mylonite is basically a fine-grained schist that has formed within fault zones. It is the association with faulting that distinguishes a mylonite from a fine grain schist.

Age of the Loch Borrolan complex, Assynt, and late movements along the Moine Thrust Zone

1979 ◽  
Vol 136 (4) ◽  
pp. 489-495 ◽  
Author(s):  
O. van Breemen ◽  
M. Aftalion ◽  
M. R. W. Johnson
Keyword(s):  
Thrust Zone ◽  
Moine Thrust Zone

Dislocation surfaces in the Moine Thrust Zone, Ullapool

1989 ◽  
Vol 25 (2) ◽  
pp. 143-151
Author(s):  
Robert F. Cheeney
Keyword(s):  
Thrust Zone ◽  
Moine Thrust Zone

The thrust structures of southern Assynt, Moine thrust zone

1985 ◽  
Vol 122 (6) ◽  
pp. 595-607 ◽  
Author(s):  
M. P. Coward
Keyword(s):  
The West ◽  
Igneous Complex ◽  
Basement Rocks ◽  
Thrust Zone ◽  
Moine Thrust Zone ◽  
Extensional Structures

AbstractThe Moine thrust zone of southern Assynt forms part of the northwest margin of the Caledonide belt and has aroused controversy concerning amounts and timing of thrust displacement and sequence of thrust development. Recent mapping shows it to have been a foreland propagating thrust sequence; the uppermost ductile Moine thrust formed first, followed by sequences of imbricates, a major thrust (the Ben More thrust) and then several lower duplex zones. This sequence is clear from new observations that many of the earlier thrusts were folded and/or breached during the development of the underlying structures. A displacement of over 54 km has been estimated for the zone as a whole. An alkaline igneous complex, including the large Borrolan syenite, was intruded during the development of the thrust zone and much of it was carried some 30 km to the west-northwest onto the foreland. Late extensional structures in southern Assynt are an integral part of the Caledonide thrust sequence and probably developed from the collapse of the thrust wedge as it climbed from stronger basement rocks on to a weaker cover sequence on the foreland.

Multiple fluid migration events along the Moine Thrust Zone, Scotland

2005 ◽  
Vol 162 (6) ◽  
pp. 1031-1045 ◽  
Author(s):  
Raleigh D. Blumstein ◽  
R.D. Elmore ◽  
M.H. Engel ◽  
J. Parnell ◽  
Martin Baron
Keyword(s):  
Fluid Migration ◽  
Thrust Zone ◽  
Moine Thrust Zone

The Geological Index of the Scottish Caledonides northwest of the Highland Boundary Fault

2021 ◽  
Author(s):  
Alex G Neches
Keyword(s):  
Sedimentary Cover ◽  
North Coast ◽  
British Geological Survey ◽  
Red Sandstone ◽  
Boundary Fault ◽  
Quantitative Expression ◽  
The North ◽  
Thrust Zone ◽  
Moine Thrust Zone ◽  
Group 2

<p>The quantification and mapping of geodiversity have gained more interest in recent years due to practical application in natural resource management and conservation. The Geological Index (I<sub>Geo</sub>) represents the quantitative expression of geological features and is part of a broader Geodiversity Index (I<sub>Geodiv</sub>), which also includes geomorphological, pedological, paleontological and hydrological elements.</p><p>In Scotland, the area delimited by the Moine Thrust Zone to the northwest and the Highland Boundary Fault to the southeast represents a fragment of the Caledonian orogenic belt that extends across parts of North America, Greenland and Scandinavia. It includes the Highlands, most of the Inner Hebrides and the islands of Orkney and Shetland. The area is underlain by two tectonic blocks – the Northern Highlands Terrane and the Grampian Terrane – separated by a major strike-slip fault, the Great Glen. Both blocks consist of an Archaean-Paleoproterozoic basement covered by the Neoproterozoic metamorphic suites of the Moine and Dalradian Supergroups, together with a series of magmatic intrusions and other rocks of late Precambrian and Phanerozoic age.</p><p>The I<sub>Geo</sub> was obtained from lithostratigraphic and lithodemic units, mapped at group and suite/complex level respectively, major geologic contacts and faults and minor igneous intrusions from the British Geological Survey 1:625k digital datasets. These were reclassified and analyzed using QGIS and ArcGIS software.</p><p>The results show overall medium and high values of I<sub>Geo</sub>, with regional variations and well-individualized areas of very high and very low values. Conspicuous transitions between extremes are observed at the north and south edges of the study area.</p><p>High I<sub>Geo</sub> values occur in five major areas across the mainland: 1). on the north coast, which exhibits small outcrops of varied lithologies; 2). in the northeast Grampian Mountains, where the deformed Dalradian rocks are intruded by the Cairngorms suite of the Newer Granites; 3). along the Great Glen, the meeting place of adjacent tectonic blocks; 4). in the Firth of Lorne area and further inland, where Neoproterozoic and Paleozoic rocks come into contact with more recent Cenozoic rocks of the Hebridean Province; 5). at the southern tip of the Kintyre Peninsula that contains isolated exposures of rocks characteristic of the nearby Midland Valley.</p><p>Low I<sub>Geo</sub> values are encountered in three major areas of the mainland: 1). southeast of the Moine Thrust Zone, an area occupied by the oldest Moine group; 2). in the Pentland Firth area that consists of the Old Red Sandstone Supergroup; 3). in the Firth of Clyde area and further inland, around the main outcrop of the youngest Dalradian group.</p><p>Offshore, the islands of Orkney and Shetland have I<sub>Geo</sub> values at opposite ends of the spectrum. The first are made up of a monotonous sedimentary cover. The latter comprise a mosaic of rocks of Precambrian and early Phanerozoic age.</p>

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