© Photo Patricia MacDonald of Aerographica. These differences, and sparse geochronological data, have led some to regard the Buchan Block as an allochthonous terrane comprising exotic pre-Caledonian gneisses and cover rocks thrust into their current position during Grampian orogenesis Sturt et al. This observation supports an alternative interpretation that anatexis was the result of the mid-Ordovician Grampian metamorphism, rather than an older tectonothermal event, and that the Inzie Head gneisses are autochthonous. Recent reviews on the Caledonides of Scotland and Ireland have been provided by Stephenson et al. Aerial photographs provide particularly dramatic views of this spectacular linear feature, which extends across the width of the Scottish mainland.
In contrast, the predominant rocks at Cairn Leuchan described by Aoki et al. Fairchild , Bonahaven Formation ArgyIl Group , North Coast of Islay I. No quibble refund if not completely satisfied. A well-illustrated geological survey of the British Isles. A local succession immediately west of the Walls Boundary Fault is of even more-dubious Dalradian affinity. The Grampian Highlands region covers a large area and understanding its complex geology calls for a wide variety of geological expertise. The rocks in the foreground were deposited in an estuarine environment.
With usual stamps and markings, In fair condition, suitable as a study copy. Mineral chemistry in the metapelites can be related to contact metamorphic reactions and to a change in bulk rock chemistry due to partial melting of the metasediments in the high-grade parts of the aureole. Within United Kingdom About this Item: Her Majesty's Stationery Office, 1971. There is convincing evidence for glacial episodes of worldwide importance and economic deposits of stratiform barium minerals are unique. The inferred parental magmas were basalts with MgO c. Within the basin there was a large freshwater lake that was home to rich diversity of fish, the fossil remains of which can be found in the Devonian rock layer sequence.
Retrograde reaction textures are used to infer the sequence of reactions, involving muscovite and biotite, by which melting proceeded during prograde evolution. Beyond that, correlations with the established Dalradian succession are tenuous and are not possible at formation level. At the margins of the Moray Firth, in the vicinity of Elgin, areas of Permian and Triassic rocks occur. The sediment was derived from the weathering and erosion of the Caledonian Mountains to the south and west. Even now, however, that understanding is incomplete and there is still controversy over several issues of fundamental significance. It will therefore have tanned pages, age spots and plenty of shelf wear. The Buchan Anticline is likely an expression of crustal thinning and asthenospheric upwelling, which produced voluminous gabbroic intrusions that supplied the heat for Buchan metamorphism.
This rift setting is evidenced, in the upper half of the succession, by the presence of several volcanic sequences. Much of the area to the south-west comprises ice-scoured plateau landscapes, with the grain of the topography strongly controlled by the underlying geology. The Grampians region is mostly one of uplands and mountains, and includes the highest peak in Britain, Ben Nevis 1343 m. The Dalradian Supergroup, as defined, may actually comprise at least two distinct tectonostratigraphic sequences. As a consequence of their researches a complete stratigraphical succession has been established.
This heat was probably supplied by synorogenic magmas e. Thus, the rocks preserve a continuous metamorphic field gradient that straddles the shear zone network. However, field observations show that the onset of in situ partial melting in metapelitic rocks, which was associated with the formation of garnet-bearing aplites and associated pegmatites, occurred around Fraserburgh, where shear fabrics are absent. The Fault is later than the minor intrusives associated with the Younger Granites of the Scottish Highlands and is suggested to be of a Lower or Middle O. Please note this book is over 20 years old. Pressures at peak-T conditions along the eastern coast were the lowest observed, c. The guide was compiled and edited by Dr D I J Mallick and Dr G C Clark.
These narrow zones of weakened rock have been actively eroded to form deep elongated hollows. The intrusion belongs to a swarm of rift-related, A-type granitoids that originally stretched from the Appalachians to Scotland, and includes foliated granitoids in the Moine. For example, the Scottish promontory of Laurentia drifted rapidly southwards through c. Whatever the origins of the Neogene planation, it seems probable that the maximum elevation of the uplifted high Grampian Highland surface was located in the general area of the present day north—south divide, which Sissons 1967 considers to be a continuation of that in the Northern Highlands. Based on previous editions by the late F. Stationery Off 1948 Physical description vi, 89 p : illus.
It differs from the classic Barrovian metamorphic zones and the Cromar Type of migmatite developed in regions farther south in that temperature control is dominant and so-called antistress minerals have a regional distribution. As a consequence, the present Highland surface is not far removed from that of the eroded Caledonian mountain belt, which was the surface on which the Palaeozoic Old Red Sandstone sediments were deposited and which is now exposed at moderately high levels throughout the Highlands. The Highland Border region is defined here by the outcrop of the Southern Highland Group that lies north-west of the Highland Boundary Fault and runs from Stonehaven south-west to the Isle of Bute, and thence to the Campbeltown peninsula. The detailed stratigraphy of the Dalradian Supergroup ranges from the uppermost Grampian Group through to the top of the Argyll Group, most notably seen in the two classic areas of Loch Leven—Appin and Schiehallion—Loch Tay; Southern Highland Group strata are preserved only in a small structural inlier south of Glen Lyon. O 1936 Physical description vi, 100 p. Within United Kingdom About this Item: Stationery Office Books, 1971. Watson 1984 discusses in detail the tectonics of block and extension faulting which, since Palaeozoic times, has provided the control on Highland physiographic evolution.
The footprints, trackways and traces of these animals have also been spectacularly preserved. Within United Kingdom About this Item: Stationery Office Books, 1971. To the west, the mountains of Lochaber have been heavily dissected by glacial erosion with the formation of corries and over-deepened valleys. Stream-sediment geochemistry first indicated the presence of Ba and Zn enrichment in the area. I am sure that this fourth edition of the regional guide to the Grampian Highlands will prove as popular as its predecessors with geologists, planners, environmentalists, students and tourists and all those whose wish to have a better geological understanding of this magnificent region of Britain. Palaeomagnetic data define a polar wander path for the Dalradian tectonic block of the Scottish Highlands but resolve no relative motion between the Dalradian and Midland Valley blocks from early Ordo vician onwards.