This website uses cookies to ensure you get the best experience. Learn more

metamorphic

metamorphic

metamorphic Sentence Examples

  • The lodes occur in Silurian metamorphic micaceous schists, intruded by granite, porphyry and diorite, and traversed by numerous quartz reefs, some of which are gold-bearing.

  • The metamorphic rocks of western Crete form a series some 9000 to 10,000 ft.

  • It is, however, not impossible that the metamorphic series includes also some of the Lias.

  • E Arabian Sea Ba Of G A L e Geological information incomplete Desert Deposits Quaternary Tertiary Mesozoic Palaeozoic Archaean and Metamorphic Younger Volcanic Rocks English Miles b iuHi iiiiuiiiiii after llargl,aua Geology The geology of Asia is so complex and over wide areas so little known that it is difficult to give a connected account of either the structure or the development of the continent, and only the broader features can be dealt with here.

  • aA'ecv, to split), in petrology, metamorphic rocks which have a fissile character.

  • Schists, as a rule, are found in regions composed mainly of metamorphic rocks, such as the Central Alps, Himalayas, and other mountain ranges, Saxony, Scandinavia, the Highlands of Scotland and north-west of Ireland.

  • The first group is the more important and includes some of the commonest metamorphic rocks.

  • They are soft and lustrous, with a peculiarly smooth feel, and though often confounded with mica-schists may be distinguished by their richness in magnesia; many of them contain tremolite or actinolite; others have residual grains of olivine or augite; and here also every gradation can be found between the unmodified igneous types and the perfectly metamorphic schists.

  • Practically all the remaining area in these islands is occupied by metamorphic schists and gneisses which occur in great variety and with which are associated numerous dikes and masses of intrusive igneous rock.

  • 1857) graduated at the university of Wisconsin in 1879, became instructor in geology there in 1883, in 1897 became consulting geologist of the Wisconsin Geological and Natural History Survey, and in 1900 became geologist in charge of the Division of Pre-Cambrian and Metamorphic Geology, U.S. Geological Survey.

  • The foundation of the island is formed of metamorphic and igneous rocks, which appear in the Sierra Maestra and are exposed in other parts of the island wherever the comparatively thin covering of later beds has been worn away.

  • The mountain ranges of the east of Brazil, from Cape St Roque to the mouth of the river Plate, are composed chiefly of crystalline and metamorphic rocks.

  • Some of the metamorphic rocks may belong to the older Palaeozoic period, but the greater part of the series is probably Archaean.

  • It consists of a series of plateaus formed of sedimentary rocks which mainly belong to three formations of widely separated ages, and which rest on a platform of granitic and metamorphic rocks.

  • In the Umzimkulu river and in the Tugela river below its junction with the Buffalo, metamorphic limestones are associated with schists, gneisses and granites.

  • The famous ruby mines of Upper Burma are in metamorphic rock, while the jadeite of the Bhamo neighbourhood is associated with the Tertiary intrusions of serpentine-like rock already noticed.'

  • The central plateau consists almost entirely of metamorphic rocks with extensive tracts of granite in Unyamwezi.

  • The rocks in the Arakan range and its spurs are metamorphic, and comprise clay, slates, ironstone and indurated sandstone; towards the S., ironstone, trap and rocks of basaltic character are common; veins of steatite and white fibrous quartz are also found.

  • They occur (a) in crystalline igneous and metamorphic rocks as an original constituent, (b) in veins associated with igneous rocks, and (c) in sedimentary rocks either as organic fragments or in secondary concretionary forms.

  • In many deposits of iron ores found in connexion with igneous or metamorphic rocks small quantities of phosphate occur.

  • While igneous and metamorphic crystalline rocks form the bulk of the Adirondack area, it is surrounded by a ring of ancient Palaeozoic sediments in which these peripheral lowlands have been developed.

  • Most of them are the metamorphic products of igneous rocks, among which extrusive rocks, many of them pyroelastic, predominate.

  • Metamorphosed sedimentary rocks are widely distributed in the schistose series, but they are distinctly subordinate to the meta-ignecius rocks, and they are so highly metamorphic that stratigraphic methods are not usually applicable to them.

  • Wherever it comes to the surface it comes up from beneath younger rocks which are, as a rule, less metamorphic. By means of deep borings it is known at many points where it does not appear at the surface, antI is believed to be universal beneath younger systems.

  • The commoner sorts of rock in the several Huronian systems are quartzite and slate (ranging from shale to schist); bi~t limestone is not wanting, and igneous rocks, both intrusive and extrtisive, some metamorphic and some not, abound.

  • the Pescadero formation) it is highly metamorphic. The Eocene of southern California carries gypsum enough to be of commercial value.

  • Igneous and metamorphic rocks.

  • As in the neighbouring mainland of Caithness, these rocks rest upon the metamorphic rocks of the eastern schists, as may be seen on Pomona, where a narrow strip is exposed between Stromness and Inganess, and again in the small island of Graemsay; they are represented by grey gneiss and granite.

  • Ter ?, (-- �?s'`4" Gn Metamorphic Rocks Subalpine Alagelfluh Rigi Ter Jr Schiichenthal Cretaceous & Eocene Range A Aar Massif Gotthard Massif,, ',�?'

  • Their geological formation is metamorphic gneiss, veined with felspar and quartz, and interspersed with reddish porphyrite.

  • There is a central region, roughly triangular in shape, with its base resting upon the Quaternary K Triassic Tertiary Carboniferous q & Metamorphic 7 Jurassic Aegean Sea and its apex in Servia.

  • This great series of metamorphic rocks, the geological age of which is still unsettled, has had a powerful effect on the scenery, especially along the Highland line.

  • The island is composed largely of crystalline and metamorphic rocks, but contains some cretaceous areas which hold extensive beds of coal, especially on the east coast.

  • The oldest rocks, consisting of slate, mica-schists and grits, which have been correlated with the metamorphic series of the eastern Highlands, form an incomplete ring round the granite in the north of the island and occupy the whole of the west coast from Loch Ranza south to Dougrie.

  • Consisting of red sandstones, mudstones and conglomerates, they are inclined at high angles usually away from the granite massif and the encircling metamorphic rocks.

  • These porphyritic rocks form a characteristic feature of the southern Andes, and were at one time supposed to be metamorphic; but they are certainly volcanic, and as they contain marine fossils they must have been laid down beneath the sea.

  • The second is the zone of the snowy peaks and of the lower Himalaya, and is composed chiefly of crystalline and metamorphic rocks together with unfossiliferous sedimentary beds supposed to be of Palaeozoic age.

  • While the general elevation is 7000 to 9000 ft., the individual peaks, consisting largely of granites and metamorphic slates, reach altitudes of 10,000 ft.

  • There too the hydrographical network, as well as the south-west to north-east strike of the clay-slates and metamorphic schists on Ditmar's map, seem to indicate the existence of two chains running south-west to north-east, parallel to the volcanic chain of S.-E.

  • Old Red Sandstone & Devonian r (Silurian Ordovician Cambrian Metamorphic Group + +J Volcanic Rocks It Basic Intrusive Rocks 'V /1 '

  • The form of his ideals was modified by the metamorphic glow of Transcendentalism which passed through the region of Boston in the second quarter of the 19th century.

  • The difference in character of the Jurassic beds on the two sides of the chain appears to indicate that a ridge existed Metamorphic Plutonic & Volcanic in that period.

  • The northern periphery lies in French Congo: the western boundary is formed by a zone of Archean and metamorphic rocks and a region composed of several rock groups considered to range between the Silurian and Carboniferous periods; but it is only in the limestones of one group that fossils, indicating a Devonian age, have been found.

  • The following formations are represented: - Sedimentary and Metamorphic. Recent.

  • The metamorphic rocks compose the main mass of the tableland, and are exposed in every deep valley in Tigre and along the valley of the Blue Nile.

  • In the region of Adigrat the metamorphic rocks are invariably overlain by white and brown sandstones, unfossiliferous, and attaining a maximum thickness of moo feet.

  • They comprise Seil, Easdale, Torsay, Luing and Shuna, and owe their name to the fact that they are composed mainly of metamorphic rocks, Easdale, Torsay and Luing being entirely slate, Seil mostly slate with some porphyrite in the north, and Shuna gneissose.

  • Like the highlands of eastern Asia, those of Turkestan are mostly built up on Pre-Cambrian gneisses and metamorphic slates, resting upon granites, syenites, old orthoclase porphyries, and the like.

  • The Alai is a well-defined ridge with steep slopes, and both it and the Terek-tau, which prolongs it towards the Kokshal-tau, are flanked next the Ferghana valley by what appear to be the old uplifted strata both of the old Palaeozoic series of metamorphic limestones and of the newer Tertiary series of softer conglomerates and sandstones.

  • The great difference in character, however, between the Silurian strata at Pomeroy in county Tyrone and the adjacent metamorphic series makes it highly probable that the latter masses are truly Archean.

  • Even if the volcanic and intrusive basic rocks prove to be Ordovician (Lower Silurian), which is very doubtful, the metamorphic series of the core is clearly distinct, and appears to be " fundamental " so far as Ireland is concerned.

  • The other metamorphic areas of the north present even greater difficulties, owing to the absence of any overlying strata older than the Old Red Sandstone.

  • Geikie for the metamorphic series of the old kingdom of Dalriada.

  • I Silurian (and Cambrian?) "Dalradian" Metamorphic Series .Diorite and allied Basic Rocks '?-t =i=' Granite and allied Acid Rocks montory the conglomerates of this period rest with striking unconformity on the Dingle Beds and Upper Silurian series.

  • The Senonian limestone itself, which rests in the extreme north on Trias or even on the schists, is often conglomeratic and glauconitic at the base, the pebbles being worn from the old metamorphic series.

  • argillaceous metamorphic rock (slate ).

  • graben basins infilled with carbonate and clastic sedimentary rocks unconformably overlying pre Tertiary metamorphic and igneous rocks.

  • The Highland boundary fault separates the metamorphic bedrock of the highlands and the old red sandstone underlying the lowlands.

  • metamorphic petrology in the next are able to synthesize information they obtain from both courses.

  • metamorphic rock, with varying dark shades.

  • metamorphic assemblages which can he considered to be metasedimentary in origin.

  • metamorphic evolution of the Zanskar High Himalaya.

  • metamorphic fluids in the deep crust.

  • metamorphic reaction, a number of processes must operate in concert.

  • regional metamorphism refers to large scale metamorphic rock regions associated with mountain building from tectonic activity.

  • overstepping of prograde metamorphic reactions in metapelites from the Bushveld aureole.

  • Students studying structural geology in one term and metamorphic petrology in the next are able to synthesize information they obtain from both courses.

  • Solid Geology The bulk of the basement rock on either side of Loch Ness is classified as metamorphic, mostly schists.

  • The lodes occur in Silurian metamorphic micaceous schists, intruded by granite, porphyry and diorite, and traversed by numerous quartz reefs, some of which are gold-bearing.

  • This county includes in the north an area of the gneiss that is discussed under county Donegal, and, west of Omagh, a metamorphic region that stretches in from the central axis of Tyrone.

  • The metamorphic rocks of western Crete form a series some 9000 to 10,000 ft.

  • It is, however, not impossible that the metamorphic series includes also some of the Lias.

  • E Arabian Sea Ba Of G A L e Geological information incomplete Desert Deposits Quaternary Tertiary Mesozoic Palaeozoic Archaean and Metamorphic Younger Volcanic Rocks English Miles b iuHi iiiiuiiiiii after llargl,aua Geology The geology of Asia is so complex and over wide areas so little known that it is difficult to give a connected account of either the structure or the development of the continent, and only the broader features can be dealt with here.

  • In some cases it appears to have segregated from a basic eruptive magma, and in other cases to have resulted from metamorphic action.

  • aA'ecv, to split), in petrology, metamorphic rocks which have a fissile character.

  • Schists, as a rule, are found in regions composed mainly of metamorphic rocks, such as the Central Alps, Himalayas, and other mountain ranges, Saxony, Scandinavia, the Highlands of Scotland and north-west of Ireland.

  • The first group is the more important and includes some of the commonest metamorphic rocks.

  • They are soft and lustrous, with a peculiarly smooth feel, and though often confounded with mica-schists may be distinguished by their richness in magnesia; many of them contain tremolite or actinolite; others have residual grains of olivine or augite; and here also every gradation can be found between the unmodified igneous types and the perfectly metamorphic schists.

  • Practically all the remaining area in these islands is occupied by metamorphic schists and gneisses which occur in great variety and with which are associated numerous dikes and masses of intrusive igneous rock.

  • The metamorphic rocks of the rest of Mainland are principally coarse gneisses, micaceous and chloritic schists, quartzites, &c.; in these rocks at Tingwall and Wiesdale considerable beds of limestone occur, which may be followed across the island in a northerly direction to Yell Sound, and to Dales Voe in Delting.

  • 1857) graduated at the university of Wisconsin in 1879, became instructor in geology there in 1883, in 1897 became consulting geologist of the Wisconsin Geological and Natural History Survey, and in 1900 became geologist in charge of the Division of Pre-Cambrian and Metamorphic Geology, U.S. Geological Survey.

  • The foundation of the island is formed of metamorphic and igneous rocks, which appear in the Sierra Maestra and are exposed in other parts of the island wherever the comparatively thin covering of later beds has been worn away.

  • The mountain ranges of the east of Brazil, from Cape St Roque to the mouth of the river Plate, are composed chiefly of crystalline and metamorphic rocks.

  • Some of the metamorphic rocks may belong to the older Palaeozoic period, but the greater part of the series is probably Archaean.

  • It consists of a series of plateaus formed of sedimentary rocks which mainly belong to three formations of widely separated ages, and which rest on a platform of granitic and metamorphic rocks.

  • In the Umzimkulu river and in the Tugela river below its junction with the Buffalo, metamorphic limestones are associated with schists, gneisses and granites.

  • The geological structure of the country is comparatively simple, consisting in the main of plateaus formed of sedimentary rocks, resting on a platform of granitic and metamorphic rocks (see Natal: Geology).

  • The famous ruby mines of Upper Burma are in metamorphic rock, while the jadeite of the Bhamo neighbourhood is associated with the Tertiary intrusions of serpentine-like rock already noticed.'

  • The central plateau consists almost entirely of metamorphic rocks with extensive tracts of granite in Unyamwezi.

  • The rocks in the Arakan range and its spurs are metamorphic, and comprise clay, slates, ironstone and indurated sandstone; towards the S., ironstone, trap and rocks of basaltic character are common; veins of steatite and white fibrous quartz are also found.

  • They occur (a) in crystalline igneous and metamorphic rocks as an original constituent, (b) in veins associated with igneous rocks, and (c) in sedimentary rocks either as organic fragments or in secondary concretionary forms.

  • In many deposits of iron ores found in connexion with igneous or metamorphic rocks small quantities of phosphate occur.

  • While igneous and metamorphic crystalline rocks form the bulk of the Adirondack area, it is surrounded by a ring of ancient Palaeozoic sediments in which these peripheral lowlands have been developed.

  • Most of them are the metamorphic products of igneous rocks, among which extrusive rocks, many of them pyroelastic, predominate.

  • Metamorphosed sedimentary rocks are widely distributed in the schistose series, but they are distinctly subordinate to the meta-ignecius rocks, and they are so highly metamorphic that stratigraphic methods are not usually applicable to them.

  • Wherever it comes to the surface it comes up from beneath younger rocks which are, as a rule, less metamorphic. By means of deep borings it is known at many points where it does not appear at the surface, antI is believed to be universal beneath younger systems.

  • The commoner sorts of rock in the several Huronian systems are quartzite and slate (ranging from shale to schist); bi~t limestone is not wanting, and igneous rocks, both intrusive and extrtisive, some metamorphic and some not, abound.

  • the Pescadero formation) it is highly metamorphic. The Eocene of southern California carries gypsum enough to be of commercial value.

  • Igneous and metamorphic rocks.

  • As in the neighbouring mainland of Caithness, these rocks rest upon the metamorphic rocks of the eastern schists, as may be seen on Pomona, where a narrow strip is exposed between Stromness and Inganess, and again in the small island of Graemsay; they are represented by grey gneiss and granite.

Browse other sentences examples →