III.—The Gneissose-Granite of the Himalayas

1887 ◽  
Vol 4 (5) ◽  
pp. 212-220
Author(s):  
C. A. McMahon
Keyword(s):  
Igneous Rocks ◽  
Geological Survey ◽  
Short Account ◽  
Near Future

The cause, or causes, which result in the foliation of igneous rocks is a subject which at present occupies the attention of many geologists, and seems likely, in the near future, to lead to some discussion. In view of this, a short account of the foliated granite of the Himalayas may be of interest. It may be as well, however, to preface my remarks by saying that I believe that foliation may be produced in several distinct ways, and the explanation which I offer of the mode in which the foliation of the Himalayan granite has been brought about is only intended to apply to the case of that granite.In the following pages I propose to give a brief summary only of some of the more important results worked out in detail in a series of papers published in the Eecords of the Geological Survey of India; and to add thereto a brief consideration of the question whether the foliation of the gneissose-granite of the Himalayas

scholarly journals V.—Note on the Highland Border Series, near Aberfoyle

1914 ◽  
Vol 1 (9) ◽  
pp. 402-404 ◽  
Author(s):  
T. J. Jehu
Keyword(s):  
Igneous Rocks ◽  
Geological Survey ◽  
The West ◽  
Series Form ◽  
Lower Silurian ◽  
Close Resemblance ◽  
Southern Border

The rocks of this series form an interrupted belt along the southern border of the Highlands from Stonehaven on the east to the island of Arran on the west, and they appear again on a more extensive scale in Ireland. In Scotland the series consists of cherts or jaspers and shales, sometimes associated with limestones and with some peculiar igneous rocks. The age of the series has been for years a matter of controversy. Many geologists have held that these rocks are of pre-Cambrian age, but Messrs. Peach & Horne in their volume on The Silurian Rocks of Britain (Mem. Geol. Surv., 1899) remarked on the close resemblance of the rocks of this belt to some of the Arenig rocks in the Southern Uplands of Scotland, and the belt has been marked on the Geological Survey maps as doubtfully Lower Silurian.

The Contaminated Gabbro of Easter Saphook near Old Meldrum in Aberdeenshire

1921 ◽  
Vol 58 (4) ◽  
pp. 177-183 ◽  
Author(s):  
H. H. Read
Keyword(s):  
Igneous Rocks ◽  
Geological Survey ◽  
North East ◽  
Rock Types

In North-East Scotland the igneous rocks have been divided into two series, whose times of intrusion were separated by the movements responsible for the foliation and disposition of the crystalline schists of that area.2 With the older series, intruded prior to or during those movements, this paper is not concerned. The younger, or non-foliated, series supplies rock types ranging from peridotite to granite. Gabbro is the chief rock in the large independent basic masses formed by the younger igneous rocks; to the more important of these masses may be given the names of the Huntly, Insch, Boganloch, Haddo, Arnage, Maud, and Belhelvie Masses. For the most part they lie within Sheets 76, 77, 86, and 87 of the 1 inch Geological Survey Map of Scotland.

scholarly journals Chemical Analyses of Igneous and Metamorphic Rocks of Denmark, the Faeroes and Greenland. (To and including 1940)

1942 ◽  
Vol 68 ◽  
pp. 1-105
Author(s):  
Sole Munck ◽  
Arne Noe-Nygaard
Keyword(s):  
Comparative Study ◽  
Igneous Rocks ◽  
Geological Survey ◽  
Metamorphic Rocks ◽  
Chemical Analyses ◽  
The Past ◽  
De Quervain ◽  
Set Up ◽  
The Comparative Study

The past ten years or so have seen the publication of collections of chemical rock analyses which, as a result of their clear form of set-up, in many ways faciliate the comparative study of the chemistry of the rocks and their mutual relationships. Among these publications there are: P. Niggli, F. De Quervain & R. U. Wintherthalter: Chemismus schweizerischer Gesteine. Bern 1930, and the analyses publish ed by the Geological Survey of Great Brita in: Chemical Analyses of Igneous Rocks, Metamorphic Rocks and Minerals. London 1931. Similar publications are available from two neighbouring countries, i.e. from Sweden: W. Larsson: Chemical Analyses of Swedish Rocks (Bull. Geol. Inst., Uppsala 1932) and from Finland : L. Lokka: Neuere Chemische Analysen von Finnisch en Gesteinen (Bull. Comm. Geol. de Finlande No. 105. Helsingfors 1934).

6. Geology and Petrology of St Abb's Head

1888 ◽  
Vol 14 ◽  
pp. 177-193
Author(s):  
J. Geikie
Keyword(s):  
Igneous Rocks ◽  
Geological Survey ◽  
The Past ◽  
The Government ◽  
Past Summer ◽  
Sea Coast

The observations recorded in this paper have reference chiefly to the coast-sections at St Abb's Head and Coldingham Shore. The district was geologically surveyed some twenty-five years ago by my brother, Dr A. Geikie, and subsequently described by him in the Memoirs of the Geological Survey. Since the publication of that memoir, no further examination of the ground in question appears to have been made. During the past summer I visited the neighbourhood, principally for the purpose of studying the igneous rocks which are so well exposed in sea-coast sections. At the date of the Government Survey of Eastern Berwickshire the aid of the microscope had not yet been invoked by field-geologists for the purpose of determining rock-species, and I was therefore curious to compare the igneous rocks of that region with those of similar age which I had studied elsewhere in Scotland, and more especially with the bedded and intrusive porphyrites and tuffs of the Cheviot Hills and the Sidlaws.

III.—On the Succession and Classification of the Beds between the Chalk and the Lower Boulder-clay in the Neighbourhood of Cromer

1877 ◽  
Vol 4 (7) ◽  
pp. 300-305 ◽  
Author(s):  
Clement Reid
Keyword(s):  
Detailed Examination ◽  
Geological Survey ◽  
Director General ◽  
Short Account ◽  
Boulder Clay

By the permission of the Director-General of the Geological Survey I am enabled to publish a short account of the results arrived at during a detailed examination of the cliffs between Weybourn and Mundesley on the coast of Norfolk.

III.—A remarkable instance of Rock Differentiation

1908 ◽  
Vol 5 (8) ◽  
pp. 344-352
Author(s):  
Harford J. Lowe
Keyword(s):  
Igneous Rocks ◽  
Geological Survey ◽  
The South ◽  
Different Parts ◽  
The Hamlet

Upon Sheet 339 (Devonshire) of the new Geological Survey maps, one instance out of the very numerous outcrops of igneous rocks thereon indicated proves to be of unusual interest by reason of its peculiar constitutional modifications in different parts of the same mass. The rockin question occurs about four and a quarter miles 15° north of west from Newton Abbot, near to the hamlet of Bickington, within the limits of a farm named Lurcombe. It is an intrusive amidst the shales and grits of the Culm, occurring almost on the junction-line between that series and the Devonian, whose massive limestones and volcanics dominate it in elevation within a quarter of a mile on the south-east.

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