The Diorites and Associated Rocks of the Glen Tilt Complex, Perthshire

1938 ◽  
Vol 75 (4) ◽  
pp. 174-184 ◽  
Author(s):  
W. A. Deer
Keyword(s):  
Small Area ◽  
Biotite Granite ◽  
Reasonable Doubt ◽  
The South ◽  
The North ◽  
South West ◽  
Granitic Intrusion ◽  
Western Side ◽  
Basic Rocks ◽  
North Western

The Glen Tilt Complex, one of the larger masses of the Newer Granites of the Central Highlands, is included in sheet 64 of the Geological Survey of Scotland. The greater part of this complex is a granite which is bounded on the south-west and southeast by an earlier series of intermediate and basic rocks. The granites described in this contribution are restricted to a small area at the south-eastern margin of the large granitic intrusion generally known as the Beinn Dearc granite. The smaller and independent intrusion of the Sron a ‘Chro’ granite and a number of smaller masses of granite associated with the marginal strip of diorites on the north-western side of Glen Tilt have also been examined. These small isolated areas appear to be contemporaneous with the intrusion of the main Beinn Dearc mass and have been intruded between the earlier diorites and the margin of the intrusion, a feature not uncommon in many of the other Scottish Newer Granites. A small independent mass of muscovite-biotite-granite intruded into quartz-mica-diorite occurs on Conlach Mhor. Although these rocks are completely isolated from both the biotite- and muscovite-biotite-granites of the main Beinn Dearc intrusion their essential similarity with the latter leaves no reasonable doubt of their common origin.

scholarly journals Geochronology of granites of the western Korosten AMCG complex (Ukrainian Shield): implications for the emplacement history and origin of miarolitic pegmatites

2021 ◽  
Vol 33 (6) ◽  
pp. 703-716
Author(s):  
Leonid Shumlyanskyy ◽  
Gerhard Franz ◽  
Sarah Glynn ◽  
Oleksandr Mytrokhyn ◽  
Dmytro Voznyak ◽  
...  
Keyword(s):  
Economic Value ◽  
Ukrainian Shield ◽  
Western Region ◽  
The South ◽  
Anorthosite Massif ◽  
Granitic Intrusion ◽  
Plutonic Complex ◽  
Flow Through ◽  
Basic Rocks ◽  
North Western

Abstract. The origin of large miarolitic (also known as “chamber”) pegmatites is not fully understood although they may have great economic value. The formation of cavities in magmatic bodies is related to melt degassing and gas or fluid flow through partially solidified magma. In this paper, the origin of the Volyn pegmatite field, located in the Palaeoproterozoic Korosten anorthosite–mangerite–charnockite–granite (AMCG) complex, North-Western region of the Ukrainian Shield, is discussed. Pegmatites of the field host deposits of piezoelectric quartz that is accompanied by gem-quality beryl and topaz. The Volyn pegmatite field is confined to granites located in the south-western part of the Korosten complex and extends for 22 km along the contact with the anorthosite massif within the Korosten plutonic complex. Geological data indicate hybridization of basic melts and partly crystallized granites, as well as direct impact of fluids derived from basic melts on the chamber pegmatites. The new U–Pb zircon ages obtained for granites and pegmatites of the Korosten complex confirm that the rock assemblage in the northern part of the complex crystallized between 1800 and 1780 Ma, whereas rocks in the southern part intruded mainly between 1768 and 1755 Ma. U–Pb zircon ages for granites from the south-western part of the Korosten complex indicate that granites were emplaced at 1770–1765 Ma, a few million years prior to the intrusion of the gabbro–anorthosite massif (1762–1758 Ma), while chamber pegmatites in these granites crystallized at 1760 ± 3 Ma, coevally with the basic rocks. Ultimately, the formation of the chamber pegmatites was related to the reheating of the semi-crystallized granitic intrusion and to fluids migrating from the underlying gabbro–anorthosite massif.

scholarly journals A PRELIMINARY LIST OF ACRIDIIDÆ OF ONTARIO

1902 ◽  
Vol 34 (10) ◽  
pp. 251-258 ◽  
Author(s):  
E. M. Walker
Keyword(s):  
Native Species ◽  
The South ◽  
Full List ◽  
The North ◽  
South West ◽  
Extreme North ◽  
North Western ◽  
Unrecorded Species

Since the last of my “Notes on Some Ontalio Acridiidæ” were printed, five species have been added to the list, and the number of localities for those already recorded has been considerably increased. I think,therefore, that it will make the notes more complete to conclude them with a full list of the species of this family known to occur in the Province, with their distribution as hitherto recorded.Only a small portion of the territory included in the Province of Ontario has been at all thoroughly explored by entomologists, but I do not believe there are very many native species of Acridiidæ not included in the present list. Doubtless, horvever, some of the Manitoba and Minnesota forms extend into the north-western part of Ontario, while it is extremely probable that there are unrecorded species in the south-west, and possibly a few in the east and extreme north.

scholarly journals I.—The Kishon and Jordan Valleys

1904 ◽  
Vol 1 (12) ◽  
pp. 575-582 ◽  
Author(s):  
T. G. Bonney
Keyword(s):  
Sea Level ◽  
Difficult Problem ◽  
The South ◽  
North West ◽  
The North ◽  
South West ◽  
Western Side ◽  
Physical Geology

That broad trench through the Palestine Highlands, an ancient highway and battlefield of nations—the plain of Esdraelon or the valley of Megiddo, together with the plain of Acre—has for long presented to me a difficult problem in Physical Geology, for it seemed inexplicable by subaerial denudation under existing conditions. Its floor varies roughly from five to eight miles in breadth; running approximately from south-east to north-west, it is bounded on the more western side by the limestone mountains of Samaria and on the more eastern by those of Galilee. The former descend from the ridge of Carmel (1,742 feet at highest) with a fairly steep escarpment, which becomes a little less regular as we follow it to the bastion-mass of Mount Gilboa; the latter correspond in their general outlines with those of the eastern portion of Samaria, but the advance of a lower spur towards the south-west divides the plain of Esdraelon from that of Acre, by a kind of strait in which, so far as I could see, there is but little level ground on either side of the Kishon. This spur, however, of the northern hills, hardly does more than interrupt the floor of the Kishon valley, for above it the great trench is continued between two hill masses, much of these ranging from thirteen to sixteen hundred feet above sea-level. Beyond the strait the upper basin (plain of Esdraelon) quickly broadens out, extending towards the south-east for about fifteen or sixteen miles, where it is divided into two arms by Jebel Duhy (Little Hermon) (1,690 feet), which is thus isolated from Tabor (1,846 feet) on the north, and from Gilboa (1,698 feet) on the south; a broad, rather shallow, grassy valley descending from the last-named mass to lose itself in the plain.

scholarly journals Notes on some animal parasites in British Guiana

1916 ◽  
Vol 7 (2) ◽  
pp. 179-190 ◽  
Author(s):  
G. E. Bodkin ◽  
L. D. Cleare
Keyword(s):  
Sea Level ◽  
Sand Dunes ◽  
Coastal Region ◽  
The South ◽  
British Guiana ◽  
North East ◽  
The North ◽  
South West ◽  
Western Side ◽  
River Valleys

British Guiana lies between the latitudes 0·41′ N. (source of the Essequebo River) and 8° 33′ 22″ N. (Punta Playa), has a depth from north to south of about 500 miles, a seaboard of about 270 miles trending in a south-easterly direction, and occupies in the north-east of South America an area approximately equal in extent to Great Britain. It is bounded on the north by the Atlantic Ocean, on the east by Surinam or Dutch Guiana, on the south and south-west by Brazil, and on the west by Venezuela.The Colony may be divided broadly into three belts. The northern one consists of a low-lying flat and swampy belt of marine alluvium—the coastal region. This rises gradually from the seaboard and extends inland for a distance varying from 5 to 49 miles. It is succeeded by a broader and slightly elevated tract of country of sandy and clayey soils. This belt is generally undulating, and is traversed in places by sand-dunes rising from 50 to 180 ft. above sea-level. The more elevated portion of the Colony lies to the southward of the above-mentioned regions. It rises gradually to the south-west, between the river valleys, which are in many parts swampy, and contains three principal mountain ranges, several irregularly distributed smaller ranges, and in the southern and eastern parts numerous isolated hills and mountains. The eastern portion is almost entirely forest-clad, but on the south-western side there is an extensive area of flat grass-clad savannah land elevated about 300 feet above sea-level.

scholarly journals VIII.—On the Relations between the Skiddaw Slates and the Green Slates and Porphyries of the Lake-district

1869 ◽  
Vol 6 (58) ◽  
pp. 167-173
Author(s):  
Henry Alleyne Nicholson
Keyword(s):  
Short Distance ◽  
Lake District ◽  
The South ◽  
Main Area ◽  
South Eastern ◽  
The North ◽  
South West ◽  
Eastern Boundary ◽  
North Western ◽  
Great Mass

In the former portion of this paper, the Tipper or south-eastern boundary of the Skiddaw Slates, in their main area, had been traced from Troutbeck, on the N.E., as far as the head of Buttermere, onthe S.W. From this point (i.e. the north-western end of Honister Crag), the Skiddaw Slates can be traced for a very short distance across Warnscales Bottom. They are still overlaid by the felspathic trap and succeeding band of slates and breccias, which together compose Fleetwith Pike and the S.E. end of Honister Crag, and the relations between the two formations are the same as in the Gatescarth Valley. When however the pass of Scarf Gap on the south-west of Warnscales is reached, the Skiddaw Slates have disappeared and the base of the Green Slate Series now rests upon a great mass ofiatrusive felstone-porphyry (here almost a true syenite) which forms High Crag and High Stile. Though the Skiddaw Slates are absent here, it is interesting to observe that the stratification of the Green Slate Series can be particularly well made out in this region. The rugged hills to the S.E. of Scarf Gap are occupied by a prolongation of the great slaty band of Honister, but the beds have now to a great extent lost their former character, and have assumed very much the mineral aspect of trap, from which however they are easily distinguished by the fact that the bedding, in spite of a rough but well marked cleavage, is unusually distinct. The strata displayed in a number of magnificently moutonné'd crags and bosses, in which they are seen to undulate repeatedly, forming a series of small but well-preserved anticlinals and synclinals, the dips of which are N.N.W. and S.S.E. at angles of from 25° to 35°. The inclination therefore of these beds is only about half as high as that of the Skiddaw Slates in the Gatescarth Valley.

scholarly journals Subnational estimates of maternal mortality in Nigeria: Analysis of female siblings’ survivorship histories. 

2021 ◽  
Author(s):  
Opeyemi Oluwatosin Babajide ◽  
Joshua Odunayo Akinyemi ◽  
Olusola Ayeni
Keyword(s):  
Maternal Mortality ◽  
Rural Areas ◽  
Small Area ◽  
Demographic And Health Surveys ◽  
The South ◽  
Mortality Trends ◽  
North West ◽  
North East ◽  
The North ◽  
South West

Abstract BACKGROUND High Maternal Mortality (MM) in Nigeria is further complicated by the lack of reliable estimates for subnational levels such as states and geopolitical regions. Disaggregating maternal mortality estimates by subnational levels is crucial to ensuring policy decisions and program implementation are adapted to areas with a high burden of mortality. This study involves a novel adaptation of small area estimation techniques to derive plausible estimates of levels and trends in Maternal Mortality rates and ratios for states and geopolitical regions in Nigeria. METHODS. Survivorship history data of 293,769 female siblings were provided by 114,154 women in the Nigeria Demographic and Health Surveys of 2008, 2013 and 2018. MM Rates and Ratios were estimated using the Empirical Bayesian technique for small area demographic estimates. The James-Stein estimator was used to shrink the estimates closer to the population mean values with 95% Confidence Interval (CI). RESULTS Levels of MMRatio were highest in the rural areas, States and regions in Northern Nigeria. MMRatio was consistently lower in the South West (2008=281; 2013=367; 2018=392) and higher among the Northern regions of the country, particularly the North-East (2008=654; 2013=612; 2018=901) for three consecutive surveys. Over the three surveys, mortality trends declined about 18% in the North West and 54.2% in the South East region. However, there was a 4.8% increase in MMRatio for South West between 2008 to 2018. CONCLUSIONS Nigeria has geopolitical and sub-national disparities that pose a burden to the country’s maternal health. Since several states in the Northern geopolitical zone still show high maternal mortality, targeted intervention at state levels should be explored to ensure that mothers who need help get it to ensure the sustainable development goals are met.

Contact Metamorphism by a Tertiary Dyke at Waterfoot, Co. Antrim

1940 ◽  
Vol 77 (6) ◽  
pp. 461-469 ◽  
Author(s):  
Doris L. Reynolds
Keyword(s):  
Marked Change ◽  
Contact Metamorphism ◽  
The South ◽  
Dolerite Dyke ◽  
The North ◽  
South West ◽  
The Matrix ◽  
Western Side ◽  
Red Bay ◽  
Sea Wall

Close to Waterfoot and about one and a quarter miles south of Cushendall, in Co. Antrim, a bifurcating dolerite dyke of Tertiary age outcrops on the shore approximately 750 feet south-west of Red Bay pier (see text-fig. 1). The dyke is intruded into practically horizontal beds of Triassic sandstone which contain abundant fragments and pebbles of schist and quartzite. As shown on the map, text-fig. 1, the dyke bifurcates and encloses a lenticular portion of these Triassic beds. Where unaltered by the dyke, that is in the low cliff adjoining the sea-wall to the south-west of the dyke and in that portion of the enclosed mass adjoining the south-western branch of the dyke, the Trias is a friable yellow sandstone, rich in fragments of schist and quartzite ranging in size from a few inches down to microscopic dimensions. On the south-western side of the north-eastern branch of the dyke, however, a marked change takes place. The Trias here changes in colour from yellow to grey and becomes hard and compact; and, as the dyke is approached, the fragments and pebbles become less distinct and eventually merge into the matrix of the rock. This change begins between eight and nine feet from the contact. Within a foot from the contact the alteration is so intense that the main part of the rock has a compact homogeneous appearance, so that at first glance it resembles an igneous rock with sparse xenoliths of white quartzite. The schist fragments are here represented by dafk patches which merge, often imperceptibly, into the matrix of the rock.

Hembury (Devon): Roman troops in a hillfort

Antiquity ◽  
1984 ◽  
Vol 58 (224) ◽  
pp. 171-174 ◽  
Author(s):  
Malcolm Todd
Keyword(s):  
Material Culture ◽  
Iron Age ◽  
Early Neolithic ◽  
The South ◽  
The West ◽  
North West ◽  
The North ◽  
South West ◽  
Western Side ◽  
Clear Weather

Hembury is chiefly noted as the site of a neolithic settlement and one of the finest hillforts of the Iron Age in the South-West (PL. XXIV & FIG. I ) . These prehistoric works lie at the southern tip of a long, narrow promontory extending southwards from the Greensand mass of the Blackdown Hills and overlooking the broad valleys of the Otter and the Culm. Beyond these to the west lies the Exe valley and further west still (and visible in clear weather) the Haldon ridge and the eastern tors of Dartmoor. Excavations by Miss D. M. Liddell (Liddell, 1930; 1931; 1932; 1935) between 1930 and 1935 revealed the significance of Hembury for the south-western Neolithic in particular, the material culture of the early neolithic settlement being plainly related to that of Windmill Hill. Miss Liddell's examination of the iron age fort was centred upon the two fine gates, on the western side and at the north-west angle. Little work was devoted to the interior except to trace the ditch of the neolithic causewayed enclosure and to explore the extreme southern tip of the promontory.

scholarly journals SPATIOTEMPORAL DISTRIBUTION OF TORNADOES AND SQUALLS IN THE NORTH-WESTERN BLACK SEA REGION IN 2006-2020

World Science ◽  
2021 ◽  
Author(s):  
Semerhei-Chumachenko A. B. ◽  
Agayar E. V. ◽  
Zhuk D. O.
Keyword(s):  
Black Sea ◽  
Negative Impact ◽  
Human Life ◽  
Climatic Conditions ◽  
The South ◽  
Black Sea Region ◽  
The North ◽  
South West ◽  
Almost All ◽  
North Western

Tornadoes and strong squalls are dangerous for almost all spheres of human life and the economy of the region. The degree of negative impact depends on their type, quantity, intensity, area of formation and geographical features of the territory. The article defines the dynamics of the number of tornadoes and strong squalls in the North-Western Black Sea region (Odessa, Nikolayev and Kherson regions of Ukraine) from 2006 to 2020.Geographical position of the south-west of Ukraine, synoptic processes and a variety of climatic conditions contribute to the frequent occurrence of severe convective phenomena and creating the extraordinary complexity of their space-time distribution. The study revealed current trends in the formation of dangerous convective phenomena in the south-west of Ukraine. One of the most squall-prone regions of Ukraine is the territory of the North-Western Black Sea region. During 2006-2020 there was an increase in the number of squalls and tornadoes in the North-Western Black Sea region in comparison with previous years.

scholarly journals XXXIX. The lignites and clays of Bovey Tracey, Devonshire

1862 ◽  
Vol 152 ◽  
pp. 1019-1038 ◽  
Keyword(s):  
Far East ◽  
Left Bank ◽  
The South ◽  
North East ◽  
The North ◽  
South West ◽  
North Eastern ◽  
The Village ◽  
Western Portion ◽  
North Western

The little town or village of Bovey Tracey, in Devonshire, nestles at the foot of Dartmoor, very near its north-eastern extremity; it is situated on the left bank of the river Bovey, about two miles and a half above the point at which it falls into the Teign, and is about eleven miles from each of the towns Exeter, Torquay, and Totnes*,—bearing south-westerly from the first, north-westerly from the second, and northerly from the last. A considerable plain stretches away from it in a south-easterly direction, having a length of six miles from a point about a mile west of Bovey to another nearly as far east of Newton; its greatest breadth, from Chudleigh Bridge on the north-east to Blackpool on the south-west, is four miles. It forms a lake-like expansion of the valleys of the Teign and Bovey rivers, especially the latter, whose course it may be said to follow in the higher part, where it is most fully developed; whilst the Teign constitutes its axis below the junction of the two streams. Its upper, or north-western portion, immediately adjacent to the village, is known as “Bovey Heathfield,” and measures about 700 acres.

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