How To Use Igneous rock In A Sentence
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Its occurrence is largely restricted to relatively unusual alkalic igneous rocks, such as sodic granites, certain syenites and trachytes, and related carbonatite-bearing terranes.
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The Volcanic Mid-Elevation Forests ecoregion occurs at elevations of about 7500 to 10,000 feet and is composed of igneous rocks of andesite and basalt.
Ecoregions of New Mexico (EPA)
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Throughout the week, unusually large amounts of crustae (marble revetment slabs) have been found that are mainly composed of green-white cipollino from Euboia, purple veined pavonazetto marble from Dokimeion, white marble, and even some small pieces of red porphyry, which is a type of igneous rock.
Interactive Dig Sagalassos - Roman Baths Report 6
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Piña et al. synthesize the existing geological data and provide a metallogenetic model for the Aguablanca deposit based on the structural and gravity data obtained from the Aguablanca stock and petrological, geochemical, and mineralogical data on the host igneous rocks and the ore bodies.
EurekAlert! - Breaking News
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Petrogenesis Igneous petrogenesis is the process or set of processes by which igneous rocks are formed.
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Figure 3-17 shows graphically the division of igneous rocks according to their mineral content and their grain size.
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I wonder if there are further classifications of igneous rocks.
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It is a common product of alteration in igneous rocks, and frequently occurs as well-developed crystals in association with zeolites lining the amygdaloidal cavities of basaltic and other rocks.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"
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A Maori warrior made his mere of greenstone, an igneous rock, and ground one side to a sharp edge.
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In addition to the reserves in already established environments, there remains another category, as yet unevaluated, of potential reserves of both thorium and uranium in minor accessory minerals of alkalic igneous rocks and carbonatites (intrusive limestones) which are widespread in western United States.
Nuclear Energy and the Fossil Fuels (historical)
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It and OMEGA have revealed a diversity of igneous rock compositions that rivals Earth's.
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The petrogenesis of igneous rocks in the Albany-Fraser Province is not well constrained, although U-Pb zircon geochronology establishes that most granitic protoliths were not tectonically reworked Yilgarn Craton.
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igneous rocks...closely appressed by this force
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It has also been found in silica-poor igneous rocks, such as syenite, nepheline syenite, serpentinite, and lamprophyre.
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This primary ore, or protore, was clearly formed after the solidification of the igneous rocks, though soon after, by solutions from igneous sources which followed fractured and shattered zones.
The Economic Aspect of Geology
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The occurrence of these felsic extrusive igneous rocks potentially provides key information on the complex interplay of magmatism and tectonics.
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Figure 3-17 shows graphically the division of igneous rocks according to their mineral content and their grain size.
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The petrology of British Palaeocene igneous rocks shows that the asthenosphere was unusually hot and that the lavas were produced by fractional crystallization of larger volumes of melt near the Moho.
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Igneous rocks are those that have formed from molten magma.
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Below the lowest sheet of largely coherent mafic igneous rocks is the Phyllite-Quartzite Group, a sequence of turbidites and black mudrocks.
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It has also been found in silica-poor igneous rocks, such as syenite, nepheline syenite, serpentinite, and lamprophyre.
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The original home of platinum is in basic igneous rocks, such as peridotites, pyroxenites, and dunites, where it has been found in small, scattered crystals intergrown with olivine, pyroxene, and chromite.
The Economic Aspect of Geology
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Granite and granodiorite are common intrusive igneous rocks that are restricted to the Earth's continents.
Igneous rock
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York the emery deposits are segregations of aluminum and iron oxides in norite (a basic igneous rock).
The Economic Aspect of Geology
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Clayey gravel or gravel, and crushed igneous rocks are commonly used as pavement materials, and cementitious binders are the main stabilising agents.
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Clay minerals distribute extensively in various slopes made of sedimentary rock, weathering profiles of igneous rock, metamorphic rock and sedimentary rock and colluvial deposits.
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Tests have shown that the signatures detected by Galileo are consistent with a rock like lherzolite, an igneous rock rich in silicates of magnesium and iron.
BBC News - Home
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Furthermore, the lunar orbiters confirmed that the highlands of the moon are dominated by anorthosite, an igneous rock composed primarily of the mineral feldspar and rich in calcium and aluminum.
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In contrast, the mineralized zones, above the topography created by the pre-mineralization igneous rocks, were not affected by this catastrophic sedimentation.
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This heat gradually accumulates and eventually causes localized eruptions of basaltic magmas (molten igneous rock).
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The grain size of an igneous rock depends upon the rate of cooling.
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Conversely, there is during this time interval a general scarcity of erupted igneous rocks that can be reliably tied into relative stratigraphy.
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It is true that all "Neptunists" (and I used quotation marks on purpose to show that the word was taken in a wider context) did not subscribe to the diluvialist view but it is also true that Guettard was the man primarily responsible for the break-through that clipped the wings of those who did, and of those who did not, like Warner, Saussure, and Jameson, but held that igneous rocks were precipitated out of aqueous media.
Vulcanists & Neptunists
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An attentive examination of a metamorphic region shows that here and there the alteration and recrystallisation have proceeded so far that the rocks graduate into granites and other so-called igneous rocks.
Geographical Evolution
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Clayey gravel or gravel, and crushed igneous rocks are commonly used as pavement materials, and cementitious binders are the main stabilising agents.
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As for so many cases in the Earth sciences, the igneous geologist has to work back in time using all available field, geochemical, and experimental data to construct a viable petrogenetic history for any particularly igneous rock.
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Thus the igneous rock called basalt was created at a great depth, and contains little feldspar compared to granite, which formed near the surface.
Chapter 5
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Geologically, molybdenite forms in high-temperature environments such as in igneous rocks.
Molybdenum
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The prevalence of Late Jurassic subduction-related igneous rocks indicates that arc formation and accretion orogeny were the most important processes during the evolution of this part of the Internal Hellenides.
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Igneous rocks, including granite and gabbro, are common.
Ecoregions of Oklahoma (EPA)
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Furthermore, the lunar orbiters confirmed that the highlands of the moon are dominated by anorthosite, an igneous rock composed primarily of the mineral feldspar and rich in calcium and aluminum.
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Because zeolites form in hydrous environments, typically through alteration of igneous rocks, they may ultimately be found on Mars, if liquid water did once exist on that planet.
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Furthermore, the lunar orbiters confirmed that the highlands of the moon are dominated by anorthosite, an igneous rock composed primarily of the mineral feldspar and rich in calcium and aluminum.
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Some gem minerals have crystallized directly from igneous rocks other than granite; peridot is a good example.
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This mineral is typical of a special igneous rock known as a pegmatite.
Cesium
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Major shear zones containing basic and ultrabasic igneous rocks are interpreted as suture zones.
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They were primarily studying the igneous rocks in the region but still managed to bag a few good fossils.
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They were composed of solid granodiorite; a very hard igneous rock.
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Piña et al. synthesize the existing geological data and provide a metallogenetic model for the Aguablanca deposit based on the structural and gravity data obtained from the Aguablanca stock and petrological, geochemical, and mineralogical data on the host igneous rocks and the ore bodies.
EurekAlert! - Breaking News
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Their textures and their intercrystallization with the primary minerals of the igneous rock have suggested that they are essentially a part of the norite mass, and that they crystallized during some segregative processes which were effective before the magma had solidified.
The Economic Aspect of Geology
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The resultant body of molten liquid, called magma, will solidify to produce the igneous rock, granite, but if it is still in liquid form as it approaches the surface, lava results.
Centennial
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Like labradorite and anorthite, it is a common constituent of basic igneous rocks, such as gabbro and basalt.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"
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Some gem minerals have crystallized directly from igneous rocks other than granite; peridot is a good example.
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In Fergus County, Montana, they are mined from decomposed dikes of lamprophyre (a basic igneous rock).
The Economic Aspect of Geology
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Commercial quantities of spodumene are in a special igneous rock deposit that geologists call a pegmatite.
Lithium
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The few ore bodies known have been formed as the result of unusual segregation of the nickel in highly magnesian igneous rock of the norite or gabbro type, at the time of its solidification or soon after; and in some cases, in order to produce the nickel ore, still further concentration by the agency of weathering has been necessary.
The Economic Aspect of Geology
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In other words, anamorphism tends toward the reproduction of igneous rocks, though it seldom fully accomplishes this result.
The Economic Aspect of Geology
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Eocene a great upheaval occurred; there were foldings and crumplings, igneous rock was thrust into the distorted mass, and the islands were considerably elevated above the sea.
The Bontoc Igorot
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Granulites are like their textural equivalents, granular igneous rocks, in being mosaics of interlocking crystals of roughly equal size.
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Andesite and diorite are intermediate igneous rocks that have a chemistry between mafic and felsic (silica amounts between 53 to 65%).
Igneous rock
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Nielsen, however, found no evidence for major faults and suggested that the igneous rocks had been intruded into and extruded onto the sedimentary units contemporaneously with basin development.
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(FeCO3), used as a pigment, and also found in the Kirtland shale; and various metamorphic and igneous rocks (such as andesite, schist, gabbro, slate, and olivine), which could have been picked up in the river
Tseh So, a Small House Ruin, Chaco Canyon, New Mexico :
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All igneous rocks contain at least a trace of barium, which is probably present in the silicates, and these small quantities are the ultimate source of the more concentrated deposits.
The Economic Aspect of Geology
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Major crustal rifting has also played a part in the evolution of large bodies of Proterozoic sedimentary and igneous rocks.
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In describing the physical properties of igneous rocks and the minerals that compose them, their texture and acidity were mentioned.
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The gossan is likely to resist erosion and to be conspicuous at the surface, -- though this depends largely on the relative resistance of the wall rocks, and on whether the gangue is a hard material like quartz, or some material which weathers more rapidly like limestone or igneous rock.
The Economic Aspect of Geology
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In the Tintic district of central Utah, Paleozoic limestones have been intruded by monzonite (an acid granitic or porphyritic igneous rock), and covered by surface flows, the flows for the most part having been removed by subsequent erosion.
The Economic Aspect of Geology
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igneous rock is rock formed by solidification from a molten state; especially from molten magma
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The only known igneous rocks in the area are Permian periodotite and lamprophyre dikes as well as diatremes of ultramafic composition associated with the Fluorite district.
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The steep, mountainous Volcanic Subalpine Forests ecoregion is composed of volcanic and igneous rocks, predominately andesitic with areas of basalt.
Ecoregions of Colorado (EPA)
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But the complex of anisotropy and difficulty of exploration of igneous rock reservoir far exceeds others.
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On land, igneous rocks can he granitelike material or they can he lava.
The Source
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The igneous rocks in it include a variety of types, ranging from fine-, medium-, and coarse-grained granite, to syenite, monzonite, diorite, and gabbro.
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As an added bonus, the lava would simultaneously pave roads and sidewalks when it hardens into a glassy smooth surface of igneous rock.
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It is also a widespread constituent of a variety of igneous and metamorphic rocks and is occasionally found in pegmatites and in related veins marginal to igneous rock units ranging from granite to diabase.
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The three mountainous areas consist of large cores of igneous rocks (granites and basalts) surrounded by larger areas of metamorphic rocks, mostly schists and gneiss.
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An exception may be its type locality in Colombia, where it occurs in veinlets and pockets in carbonaceous sedimentary units apparently distant from igneous rocks.
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Its occurrence is largely restricted to relatively unusual alkalic igneous rocks, such as sodic granites, certain syenites and trachytes, and related carbonatite-bearing terranes.
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Although closely associated with plutonic igneous rocks, porphyry mineralization commonly encompasses large volumes of the surrounding host rocks to the intrusion.
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Like all the radioactive clocks used by geologists, potassium/ argon timing works only with so-called igneous rocks.
THE GREATEST SHOW ON EARTH
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A platinum arsenide, called sperrylite, is sometimes found associated with sulphide minerals in basic igneous rocks.
The Economic Aspect of Geology
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Two series of igneous rocks have been found: tholeiitic, ranging from picrite basalt to basaltic andesite (to rhyodacites); mildly alkaline, with a more restricted compositional range (picrite basalts and basalts).
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For example, the igneous rock called basalt was created at a great depth and contains little feldspar compared to granite, which formed near the surface.
6. Obtaining glaze materials
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Other features of distribution of minerals associated with igneous rocks are indicated by their grouping in metallogenic provinces and epochs
The Economic Aspect of Geology
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These metamorphic and plutonic igneous rocks form the uplifted core of the broadly anticlinal Owl Creek Mountains, a mountain range that formed during the Late Cretaceous.
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As an added bonus, the lava would simultaneously pave roads and sidewalks when it hardens into a glassy smooth surface of igneous rock.
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The strata deposited at various times about their flanks have been infolded by later crumplings with the original mountain mass, and have been repeatedly crushed, inverted, faulted, intruded with igneous rocks, and denuded.
The Elements of Geology
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A pegmatite is an extremely slow-cooling igneous rock in which very large crystals can form.
Mica
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A usually coarse - grained igneous rock composed chiefly of calcic plagioclase and pyroxene.
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Basalt is a fine-grained igneous rock that is primarily composed of the iron- and magnesium-rich minerals pyroxene and olivine and calcium-rich plagioclase feldspar.
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In most rocks feldspar is in too small grains and is too intimately associated with other minerals to be of commercial importance; in only one type of rock, pegmatite, which is an igneous rock of extremely coarse and irregular texture, are the feldspar crystals sufficiently large and concentrated to be commercially available.
The Economic Aspect of Geology
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Intrusive igneous rocks such as diorite, gabbro and granite solidify below the Earth's surface while extrusive igneous rocks such as basalt, obsidian and pumice solidify on or above the surface.
The Brussels Journal - The Voice of Conservatism in Europe
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She introduces cross-hatching as an internal element in wheeling and receding shapes that recall igneous rocks scored with veins of quartz.
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Power systems in areas of igneous rock (gray) are the most vulnerable to the effects of intense geomagnetic activity because the high resistance of the igneous rock encourages geomagnetically induced currents (GICs) to flow in the power transmission lines situated above the rock.
Signs of the Times
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In igneous rock the ore-bearing solutions may have altered the wall rock to a dense mixture of quartz, sericite, and chlorite.
The Economic Aspect of Geology
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Only detailed sampling of early weathering stages combined with suitable analytical techniques can reveal the presence of gibbsite as a primary weathering product in certain weathering crusts of acid igneous rocks.
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The summit of Machacha is composed of a dark igneous rock, apparently a sort of amygdaloidal trap, with white and greenish calcareous crystals scattered through it.
Impressions of South Africa
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The rounded conglomerate pebbles consist of siltstone, mudstone, wacke, granophyric igneous rocks, and various intermediate to felsic volcanic rocks, set in a matrix rich in quartz and feldspar grains.
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Is there any other way of producing igneous rocks besides the volcanic eruption?
