The Moine thrust zone in the Assynt region, northwest Scotland.

  • 439 Pages
  • 3.41 MB
  • English
University of California Press , Berkeley
Geology -- Scotland., Faults (Geo



SeriesUniversity of California publications in geological sciences,, vol. 40, no. 6, University of California publications in geological sciences ;, vol. 40, no. 6.
LC ClassificationsQE1 .C15 vol. 40, no. 6
The Physical Object
Paginationv, 345-439 p.
ID Numbers
Open LibraryOL5933124M
LC Control Number64064350

Its outcrop width varies from a The Moine thrust zone in the Assynt region hundred metres near Ullapool to 19 km in Skye.

Download The Moine thrust zone in the Assynt region, northwest Scotland. FB2

In the Assynt region north of Ullapool, the thrust zone, there 11 km wide, is particularly well exposed in a broad open antiformal culmination termed the Assynt Window. North of Assynt the thrust zone is 2 to 5 km wide.

The terminology of mylonitic rocks is reviewed. The mylonitic rocks in the thrust-zone are divided on the basis of textures into two groups, distinguished as Primary and Secondary Mylonitic Rocks.

The primary mylonitic rocks are characterised by crystalloblastic textures and lack of post-crystalline strain in the constituent grains; texturally, they grade, with increasing grain size, into Cited by: This implies that any crustal ramp to the Moine thrust zone must lie more than 55 km east of the present outcrop of the thrust.

However, off the north coast of Scotland, deep seismic reflection profiles show moderately dipping reflections much farther to the northwest, and if these represent the crustal-scale ramp, this ramp must be offset by a.

Journal of Structural Geology, Vol. 4, No. 3, pp. to/82/ $/0 Printed in Great Britain Pergamon Press Ltd. Surge zones in the Moine thrust zone of NW Scotland M. COWARD Department of Earth Sciences, University of Leeds, Leeds LS2 9JT, U.K.

(Received 19 January ; accepted in revised form 23 April ) Abstract--The Caledonian thrust zones Cited by: The Moine thrust zone in the Assynt region is a particularly interesting part of the Moine thrust zone as it is a culmination – there is a big package of thrust slices between the undisturbed foreland and the Moine schists.

The Cambro-Ordovician sediments are an important part of the picture as they have a regular stratigraphy made up of varied distinctive rock types. View of the outcrop of the Moine Thrust at Knockan Crag, looking south.

The dark layered rock in the upper part of the photograph is mylonite formed from Moine Schists. The Moine Thrust itself lies between these dark rocks and the white Durness limestone in the centre of the photograph.

At this level the Sole Thrust, the lowest thrust fault in the Moine Thrust zone, is found. Here there is a remarkable stack of thin slices, known as an imbricate zone, in which the Cambrian rock types (Fucoid Beds, Salterella Grit and grey limestone) are repeated over and over again like a shuffled pack of cards.

Assynt has one of the largest concentrations of Neolithic cairns anywhere in Scotland. A excavation at Loch Borralan revealed a complex and accomplished structure. The orange-pink bedrock and uprights of the chamber had been worked to the desired shape using hammer stones and the whole cairn was built of the same stone.

Details The Moine thrust zone in the Assynt region, northwest Scotland. PDF

History [edit | edit source]. ASSYNT, a parish, in the county of Sutherland, 30 miles (N. by W.) from Dornoch; containing the quoad sacra district of Stoer, and the village of place, which is supposed to take its name from its irregular boundary line, the Gaelic term, as agus innte, signifying "out and in," was once a forest of the ancient thanes of Sutherland.

J.M. ChristieThe Moine Thrust Zone in the Assynt Region, North-West Scotland Univ. Calif. Publi. geol. Sci., 40 (), pp. View Record in Scopus Google Scholar. The geology of Scotland is unusually varied for a country of its size, with a large number of differing geological features.

There are three main geographical sub-divisions: the Highlands and Islands is a diverse area which lies to the north and west of the Highland Boundary Fault; the Central Lowlands is a rift valley mainly comprising Palaeozoic formations; and the Southern Uplands, which.

A little more than a year after the Act was passed in the Scottish Parliament a newly formed body, the Assynt Foundation, succeeded in purchasing the remain hectares of Assynt wilderness in a £ million community buy-out of the Glencanisp and Drumrunie Estates which including the iconic mountains of Suilven, Canisp, Cul Mor and Cul.

Another fascinating aspect of the Moine Thrust Belt is the Assynt window which exposed a large series of imbricate thrusts the protrude through the Moine Thrust. Along the flanks of this imbricate stack the lithologic contrast between the hanging and footwalls caused the river to exploit this contact leaving the thrust fault beautifully exposed.

In the Caledonides of northwest Scotland, two independent geothermometers (Fe-Mg exchange and quartz c-axis fabric opening angle) are used to characterize the thermal structure of the lower part of the Scandian (– Ma) orogenic wedge within the Moine, Ben Hope and Naver-Sgurr Beag thrust sheets.

Traced from west (foreland) to east (hinterland), Fe-Mg exchange thermometry yields peak or. The Moine Thrust Just inland from the coast, we come to our first major discontinuity, the world-famous Moine Thrust, which is best seen at Knockan Crag NNR, just north of Ullapool.

This fault plane separates ancient gneiss, sandstone and limestone of the west from overlying metamorphic rocks, the Moine, to the east. Those of us who studied geology at university may remember, with mixed feelings, fieldtrips to Assynt, in the far northwest of the Scottish Highlands, and trying to get our heads around the geometric complexity that is the Moine Thrust and its associated structures.

The Moine Thrust forms part of the North West Highland Geopark. The park is part of a European network of areas with important geology. It has rocks of more than 3, million years old. The northern part of the Moine thrust contains some of the most revered ground in British structural geology.

The Assynt culmination and Eriboll districts have attracted visitors for over a century. The Glencoul and Arnabol Thrusts were the first two such structures to be recognised within the British Isles and are amongst the first interpreted.

Deformation in advance of the Moine thrust sheet was essentially in the cover, and was mechanically similar to that in the western Appalachians.

Shearing along zones of décollement in the autochthon eventually guided the crystalline sheet into position. The décollement was not located within a single stratigraphic horizon, but rather, changed position along the strike of the fault. CHRISTIE, J. (): Mylonitic rocks of the Moine thrust zone in the Assynt region, northwest Scotland, Transactions of the Edinburgh Geological Society, 18, pp.

79– CHRISTIE, J. (): The Moine thrust zone in the Assynt region, Northwest Scot-land, University of California Publications in Geological Sciences, 40, pp. – This paper reviews the geology of the Late Ordovician - Silurian Caledonian Moine Thrust zone in the Loch Eriboll region, NW Scotland.

We present new detailed mapping and balanced/restored cross. Page - Home et al.,p. ) treated the problem of the origin of the mylonitic rocks with caution; " In these rocks immediately above the Moine Thrust cataclastic structures are not uncommon, and the question has arisen as to whether they represent crystalline schists more or less broken down or sedimentary rocks which are on the way, so to speak, to become Moine-Schist.

Torridonian + Morar Moine (c.

Description The Moine thrust zone in the Assynt region, northwest Scotland. PDF

Ga)-Greenville orogeny records amalgimation of Rodinia @ Ga 3. Loch Eil-Glenfinnian Moine-Dalradian (c. Ma)-record of sedimentation of Laurentian Craton Margin during breakup of Rodinia + rifting of Iapetus; contains evidence of 'Snowball Earth' events.

"Northwest Scotland is one of the classic areas in the annals of British geology, and its Geological Survey memoir is often claimed to be the most important ever produced". John Whittow 5 Suilven, north-west of the Moine Thrust.

One of the final acts of this great continental collision was the ‘Moine Thrust’, where a large block of metamorphic rock was moved westwards, so that it ended up on top of the relatively undisturbed sedimentary rocks of the Northwest Highlands. Find out more at The 51 Best Places to see Scotland.

A unique book and map pack describing eight walks in Assynt, ranging from easy to more challenging mountain walks. The book describes the walks in detail, explains how the landscape has formed and changed through time, and is illustrated with photographs and paintings which give a birds-eye view of the routes and scenery.

The Assynt area of the Northwest Highlands is one of the most varied and complex geological areas in Scotland. Peach and Horne returned there many times to unravel the complexities of the rock structures and in published their classic geological memoir entitled The Geological Structure of the Northwest Highlands of Scotland.

LITTLE ASSYNT AND ALL ABILITIES PATH Little Assynt and All Abilities Path (NC – NC) The good path network throughout the Little Assynt Estate can be accessed from two points on the north side of the A at either NC or NC Both have good parking available.

Assynt is the best Scottish caving region. Three caves have over 1km of passage, and the longest over 2km. The club has two huts in the area, the newest of which, Taig nam Faimh, was recently officially opened.

There are three main regions (only the most significant caves are listed). Ordnance Gazetteer of Scotland (Edinburgh: T.C. Jack, ). NB: These variant names come from our collections of historical travel writing and descriptive gazetteers: The above links take you to the first reference to this particular version of the name within a book of.

In the Coulin Forest psammitic schists some feet thick, with infrequent politic horizons, overlie the Moine thrust: the rocks are the right way up and dip gently eastwards. The Moine outcrop has been divided into an eastern zone in which the rocks owe their structure and texture to regional metamorphism and a western zone in which the rocks exhibit the structural and metamorphic effects.The West Orkney Basin developed in Devonian times, as the western part of the Orcadian intermontane basin.

It has been studied using commercial speculative seismic reflection data and the MOIST deep seismic data. The NW edge of the West Orkney Basin is formed by listric faults which are also strongly arcuate in plan, while the SE part is composed of straight domino-type faults which formed.Preview this book» What people are are saying - Write a review.

We haven't found any reviews in the usual places. Contents. Geological history and structure of Scotland N H Trewin and K E Rollin Northern Highland occur offshore Old Red Sandstone ophiolite Ordovician outcrop overlying Permian plutons psammites quartz quartzite region.