How to use igneous rocks in a sentence

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Sentence Examples The occurrence of these felsic extrusive igneous rocks potentially provides key information on the complex interplay of magmatism and tectonics. Major crustal rifting has also played a part in the evolution of large bodies of Proterozoic sedimentary and igneous rocks. They were primarily studying the igneous rocks in the region but still managed to bag a few good fossils. Conversely, there is during this time interval a general scarcity of erupted igneous rocks that can be reliably tied into relative stratigraphy. The intrusion is cut by other igneous rocks of uncertain age which could be late Caledonian. Major shear zones containing basic and ultrabasic igneous rocks are interpreted as suture zones. Petrogenesis Igneous petrogenesis is the process or set of processes by which igneous rocks are formed. She introduces cross-hatching as an internal element in wheeling and receding shapes that recall igneous rocks scored with veins of quartz. The three mountainous areas consist of large cores of igneous rocks surrounded by larger areas of metamorphic rocks, mostly schists and gneiss. The crest of the Blue Ridge is usually underlain with Precambrian or Cambrian igneous rocks. It has also been found in silica-poor igneous rocks, such as syenite, nepheline syenite, serpentinite, and lamprophyre. Below the lowest sheet of largely coherent mafic igneous rocks is the Phyllite-Quartzite Group, a sequence of turbidites and black mudrocks. These igneous rocks record the extensive magmatism that resulted from northward subduction of Neotethyan oceanic lithosphere beneath the Lhasa terrane. Although closely associated with plutonic igneous rocks, porphyry mineralization commonly encompasses large volumes of the surrounding host rocks to the intrusion. Fused, molten rock material found beneath the earth's crust from which igneous rocks are formed. Radiometric dating has also been used to assign dates to the igneous rocks associated with each layer. The Frame Lake Trail is underlain by both volcanic and plutonic igneous rocks. Rhyolite, basalt and obsidian are examples of igneous rocks that have formed at the surface of the Earth. Tachylyte, also spelled tachylite, glassy igneous rocks low in silica, such as basalt or diabase. Recent discoveries in modern convergent margins have identified igneous rocks within the oceanic trench sediments. Show More Sentences As noted previously, they are considered here primarily because they are the specific minerals used in naming alkalic igneous rocks. Crystallite, any of a type of microscopic body occurring in such glassy igneous rocks as obsidian and pitchstone. Soils derived from mafic volcanic rocks, or from a mixture of metasedimentary and igneous rocks, occur mainly as compact loams. Pyrophyllite is formed by the hydrothermal alteration of acid igneous rocks, predominantly those that are andesitic to rhyolitic in composition. The core of the Appalachians is a belt of complex metamorphic and igneous rocks that stretches all the way from Alabama to New Hampshire. Appalachian Mountains: Upland to mountainous region with thin surficial sediment on folded Palaeozoic sedimentary and igneous rocks. 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. 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. Clayey gravel or gravel, and crushed igneous rocks are commonly used as pavement materials, and cementitious binders are the main stabilising agents. 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. In contrast, the mineralized zones, above the topography created by the pre-mineralization igneous rocks, were not affected by this catastrophic sedimentation. They are metamorphic rocks, i.e. igneous rocks or sedimentary rocks that were transformed and modified at great depths in the Earth, under high pressures and high temperatures. These igneous rocks are intruded into the Leverburgh and Langevat supracrustals. Quartz is a defining constituent of granite and other felsic igneous rocks. Feldspathoids may occur along with feldspars in igneous rocks. A great many veins occur close to bodies of intrusive igneous rocks because the igneous rocks serve as heat sources that create convectively driven flows in hydrothermal solutions. There are also some igneous rocks along the trail: molten material from deep within the Earth which was injected into cracks in the sedimentary rocks. Eastern mountains are dominated by deformed, folded and faulted sedimentary rocks, whereas coastal mountains have more volcanic and massive igneous rocks. In the NCA the Precambrian metamorphic and igneous rocks that comprise of the Canadian Shield belong to that ancient and rather obscure portion of the Earth's history. Students can, for example, simulate and examine the effect of cooling rate on crystal size, using stearic acid or epsom salts, and associate this with the formation of crystals and igneous rocks. Show More Sentences Draw a series of sketches that demonstrate what happens to the mineral crystals in sedimentary and igneous rocks when they are subjected to great heat and pressure. In addition there are infrequent outcrops of igneous rocks including lavas, tuffs and volcanic vent agglomerates. Stratification, the layering that occurs in most sedimentary rocks and in those igneous rocks formed at the Earth's surface, as from lava flows and volcanic fragmental deposits. Hornblende occurs widely in metamorphic and igneous rocks. They thus hold the promise for a viable alternative to explanations which require high temperature asthenosphere as a source of large volumes of igneous rocks in some continental rifts and rifted continental margins. Limestone is less resistant than most igneous rocks, but more resistant than most other sedimentary rocks. The central cores of major mountain ranges consist of intrusive igneous rocks, usually granite. Those igneous rocks formed in the faulted and thinned continental margin of northwestern Europe contemporaneously with the rifting and seafloor spreading that gave rise to the Atlantic Ocean. Extrusive igneous rocks cool and solidify quicker than intrusive igneous rocks. All other minerals present are regarded as nonessential in almost all igneous rocks and are called accessory minerals. Types of igneous rocks with other essential minerals are very rare, and these rare rocks include those with essential carbonates. The following table is a simple subdivision of igneous rocks according to both their composition and mode of occurrence. These are the elements that combine to form the silicate minerals, which account for over ninety percent of all igneous rocks. The chemistry of igneous rocks is expressed differently for major and minor elements and for trace elements. This research can be extrapolated to the field to understand metamorphic processes and the conditions of crystallization of igneous rocks. This technique is used to date sequences that generally lack fossils or interbedded igneous rocks. The continental crust consists of lower density material such as the igneous rocks granite and andesite. Most of this salt was released from volcanic activity or extracted from cool igneous rocks. The transitional crust of volcanic margins is composed of basaltic igneous rocks, including lava flows, sills, dykes, and gabbro. These igneous rocks consists of serpentine, greenstone and basalt, typical of rocks in southeastern regions of the Arabian Peninsula. Show More Sentences Many igneous rocks also contain the sulfide minerals pyrrhotite and pentlandite. Intrusive igneous rocks those that congeal at depth are virtually always crystalline, whereas extrusive igneous rocks, or volcanic rocks, may be partly to entirely glassy. The general ecosystem of the area is montane shrubland superimposed on intrusive igneous rocks forming laccoliths. At Fort Lewis, the habitat is montane shrubland superimposed on intrusive igneous rocks forming laccoliths. The most active period of mountain building occurred about 100 million years ago, when local stresses beneath the Earth's crust forced red-hot molten rock toward the surface to produce the igneous rocks visible today. Of the high-silica, coarse-grained, quartz-rich igneous rocks, granodiorites are quantitatively the most important. Over 700 types of igneous rocks have been described, most of them having formed beneath the surface of Earth's crust. Luca is now usually placed deep underground, in a fissure in hot igneous rocks, where she fed on sulphur, iron, hydrogen and carbon. Mafic igneous rocks with microlithic to intergranular texture are ubiquitous but less abundant than more felsic compositions. Calcic amphiboles are characteristically contained in igneous rocks. Extrusive igneous rocks, also known as volcanic rocks, are formed at the crust's surface as a result of the partial melting of rocks within the mantle and crust. But other hard and tough stones were used, such as igneous rocks from Penmaenmawr in North Wales, and similar working areas to Langdale have been found there. The classification of the many types of different igneous rocks can provide us with important information about the conditions under which they formed. Two important variables used for the classification of igneous rocks are particle size, which largely depends on the cooling history, and the mineral composition of the rock. Tuff can be classified as either sedimentary or igneous rocks. A similar situation with igneous rocks occurs when xenoliths are found. Usually the area around the igneous rocks occur terobosaan remineralization process containing a very economical value such as tin and copper ore deposits. Examples from Classical Literature Of course, plateaux of accumulation are not always formed of igneous rocks. They occur in limestones and shales and are not associated with igneous rocks. To the southward, for fifty miles at least, nothing but igneous rocks can be seen. A common cause of the metamorphism of rocks is the intrusion into them of igneous rocks. About five per cent of the world's production of iron ore is from bodies of magnetite formed in association with igneous rocks. Chromite is a common minor constituent of basic igneous rocks of the peridotite and pyroxenite type. Sapphire, ruby, emerald, and tourmaline result also from contact metamorphism of sediments in the vicinity of igneous rocks. That is, the metamorphic rocks are characteristically holocrystalline, while igneous rocks are porphyritic, or cryptocrystalline. These are overlaid by a series of alternating beds of crystalline and fragmental igneous rocks. Anorthite is an essential constituent of many basic igneous rocks, such as gabbro and basalt, also of some meteoric stones. The gneisses appear to be due in many cases to the crushing and shearing of deep-seated igneous rocks, such as granite and gabbro. These igneous rocks were consolidated either upon the surface of the lithosphere or in its interior. Sheets of igneous rock are interbedded with the strata and many dikes of igneous rocks cut through the whole combination. The igneous rocks will be described under the various groups of Granitic, trappean, and Volcanic. Occasionally we meet with igneous rocks which are more or less vesicular and amygdaloidal throughout their entire mass. Crystals are found as a rarity in the amygdaloidal cavities of igneous rocks. In other words, anamorphism tends toward the reproduction of igneous rocks, though it seldom fully accomplishes this result. Like labradorite and anorthite, it is a common constituent of basic igneous rocks, such as gabbro and basalt. Here it is owing to the more enduring character of the igneous rocks that the anticlinal arch has not been entirely removed. At the bottom of the sea were the Archean or igneous rocks, the oldest formation known to geology. Show More Sentences Thus, igneous rocks distinctly predominate in the Archeozoic, while stratified rocks predominate in the Proterozoic. The mineral is occasionally found as concretionary masses in cavities in basic igneous rocks such as dolerite. Felspar is one of the principal constituents of almost all igneous rocks, such as granite, diorite, and basalt. From diabases, basalts, andesites and other igneous rocks a third type of hornfels is produced. These are characterized by igneous rocks of andesitic nature. Some occurs as crystals in igneous rocks, and some in vein deposits. The close association both in place and age with igneous rocks. What is the origin of the vesicular structure in igneous rocks? Occurs also as crystals in some limestones and igneous rocks. Crude petroleum is never found in metamorphic or igneous rocks. Find more words! 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Words that rhyme with igneous rocks Use our Sentence Generator Nearby Words igneous rock igneous Ignatius ignatia IGN iglu ignify ignimbrite ignis ignis fatuus ignitability ignitable