How to use metamorphism in a sentence

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Sentence Examples These are actually pseudomorphs of sericite after cordierite and are found included in hornfels or slate as a product of contact metamorphism. Early crustal thickening was associated with high-grade metamorphism of the basement and is kinematically complex. Field relations indicate that intrusion post-dated the peak of regional metamorphism and the main foliation-forming event. Two phases of regional metamorphism are related to their respective episodes of penetrative deformation in the southern Central Iberian Zone. From Pliocene time the shallow emplacement of intrusive bodies resulted in thermal metamorphism and hydrothermal activity. In contrast to parts of the External Hellenides, the Menderes nappes do not show Tertiary high-pressure metamorphism. Baked contacts with host rocks indicate that metamorphism associated with intrusion predates shearing. Both thrust and normal faults initiated synchronously with Miocene prograde metamorphism and melting, and have moved episodically since then. No such difference in the pressure or temperature of metamorphism in the country rock is detectable. Later, shallower and hotter metamorphism produced widespread sillimanite grade gneisses, migmatites and in situ partial melting. He regarded metamorphism and deformation as continuously related processes and found it impossible to accept migmatites as metamorphic rocks. The Dalradian of NE Scotland is a discrete lithotectonic unit and the type locality for Buchan-type high-T, low-P regional metamorphism. The sequence shows retrogression from blueschist to greenschist facies metamorphism during deformation. Uvarovite is formed from the metamorphism of impure siliceous limestones and some other rocks that contain chromium. Vesuvianite forms as a result of contact metamorphism on impure limestones and is usually found with other exotic minerals. The raw material source is a steatitic talc, also called soapstone, which originates from the thermal metamorphism of siliceous dolomitic rocks. A very low-grade metamorphism, which developed chloritoid, affects cleaved rocks. These rocks were later affected by low-grade metamorphism under high geothermal gradients. It also occurs as a secondary mineral associated with contact metamorphism of limestone. As there is no sign of contact metamorphism in the limestones, we interpret this to be a normal fault. Show More Sentences The mineralogical and textural alteration in the country rocks resulting from this heating by igneous bodies is called contact metamorphism. But the effects of contact metamorphism on its engineering geological properties, have been studied only in this work. Lower amphibolite-grade regional metamorphism predating intrusion of the Ballachulish Igneous Complex may have resulted in some monazite growth. The Moine rocks widely record polyphase deformation and metamorphism up to amphibolite facies. This was a rather surprising finding given that rutile ages commonly tend to post-date the time of metamorphism. Because of the young age of metamorphism and the low radiogenic Pb content of the titanite, precise geochronometric information was not obtained. These rocks display clear prograde metamorphism that peaks in granulite facies. Intrusion of diabase at Mt. Butters has resulted in low-grade contact metamorphism of the pre-existing sedimentary strata. Polyphase deformation accompanied metamorphism of the original sediments, that were probably dolomite, shales and siltstones. However, this age could equally relate to post obduction metamorphism. Precambrian metamorphism and migmatization and the wide spectrum of mainly Alpine mica ages provide clear evidence for such a polyphase geological history. Overall the temporal progradation of nappe emplacement and high-pressure metamorphism towards the south mimics the southward retreat of the Hellenic subduction zone. Evidence of contact metamorphism of the wall-rock includes andalusite porphyroblasts enclosed in a fabric related to Caledonian nappe emplacement. At the granite contact, there is some evidence of contact metamorphism. Thus it was able to undergo intense transformations, such as mechanical deformation or metamorphism, but remain always in proximity to the surface. In the near field above the container the borehole will be very effectively sealed by melting, recrystallization and metamorphism of the host rock backfill. The succession has experienced both a low temperature, but relatively high-pressure, regional metamorphism and a phase of earlier hydrothermal metamorphism. Orogenic or anorogenic, there was much deformation and regional metamorphism both before and during the intrusion of plutons between 1.36 and 1.47 billion years ago. The amount of melt is critical in maximizing the thickness of the recrystallized zone around the container and to the sealing of any fissures in the zone of metamorphism. The majority have undergone a degree of alteration, ranging from slight amphibolitization to greenschist facies metamorphism. Show More Sentences Even higher pressures and temperatures during horizontal shortening can cause both folding and metamorphism of the rocks. These studies can also give useful information about pathways for metamorphism through pressure, temperature, space, and time. Fossilization is a rare event, and most fossils are destroyed by erosion or metamorphism before they can be observed. These rocks have all experienced greenschist facies metamorphism and at least two intense structural deformational events. Evidence for major mass transfer and volume strain during regional metamorphism of pelites. Regional metamorphism is greenschist facies with low-pressure amphibolite facies in southwestern and eastern mainland Nova Scotia. Amphibolite and blueschist-greenschist facies metamorphism, Blue Montain inlier, eastern Jamaica, Geological Journal. The settings where magnesite-rich rocks are affected by contact metamorphism or metasomatism are, therefore, truly rare. Contact metamorphism related to intrusion of the pluton has resulted in a distinct alteration halo which hosts known mineralization. Employing contact metamorphism to assess the conditions of pluton emplacement in southwestern Kellys Mountain, Cape Breton Island, Nova Scotia. This is termed burial metamorphism, and it can result in rocks such as jade. Where both heat and pressure play a role, the mechanism is termed regional metamorphism. Namely, if the rock below the break is igneous or has lost its bedding due to metamorphism, the plane of juncture is a nonconformity. Frequently, rock formations that undergo orogeny are severely deformed and undergo metamorphism. The deformation was accompanied by retrograde metamorphism down to amphibolite facies, similar to the later Laxfordian event. The Laxfordian was originally recognised from the presence of deformation and metamorphism of the Scourie dykes. At greater distances from the plutons, the only evidence of metamorphism is spotting in these rocks. Around the edges of many of the plutons the country rocks have been transformed by heat in a process known as contact metamorphism. The Antarctic Peninsula was formed by uplift and metamorphism of sea bed sediments during the late Paleozoic and the early Mesozoic eras. Graphite occurs in metamorphic rocks as a result of the reduction of sedimentary carbon compounds during metamorphism. Show More Sentences Shales that are subject to heat and pressure of metamorphism alter into a hard, fissile, metamorphic rock known as slate. Sedgwick investigated the phenomena of metamorphism and concretion, and was the first to distinguish clearly between stratification, jointing, and slaty cleavage. The Sugar Limestone formed by thermal metamorphism of the limestone into which the Whin Sill was intruded also meets the requirements of some of these plants. Ty-pe 3 alteration occurs mainly in the contact zone between the Huntington Mountain pluton and East Bay Hills Group, suggesting its development during contact metamorphism. When temperature and pressure increase still further, the realm of diagenesis makes way for metamorphism, the process that forms metamorphic rock. The pegmatitic origin of the main host to the Mont-Laurier mineralization resulted from anatexis of sandstone units during high-grade metamorphism. The Dalradian Supergroup consists of metasedimentary rocks which underwent polyphase deformation and metamorphism during the Precambrian and early Paleozoic. Thermal metamorphism of the country rock in the contact zone produced coarse grained marbles within the aureole in a small number of places in Teesdale. Examples from Classical Literature Corundum is a product of contact metamorphism and also a result of direct crystallization from molten magma. Garnets result mainly from contact metamorphism, and commonly occur either in schists and gneisses or in marble. The birthplace of a large variety of ores and minerals is in the zone of metamorphism. Sapphire, ruby, emerald, and tourmaline result also from contact metamorphism of sediments in the vicinity of igneous rocks. In contact metamorphism, thin sheets of molten rock produce less effect than thicker ones. The subject, however, is a complex one, the full discussion of which belongs in treatises on metamorphism. Certain kinds of metamorphism are suggestive of the nature of the mineral deposits with which they are associated. Lapis lazuli usually occurs in crystalline limestone, and seems to be a product of contact metamorphism. Contact metamorphism along both the quartz-porphyry and the diorite contacts was practically lacking. Amorphous graphite is formed in many places where coal and other carbonaceous materials have undergone extreme metamorphism. Hence it is that the subject of contact metamorphism is of interest to economic geologists. A common cause of the metamorphism of rocks is the intrusion into them of igneous rocks. All of the chemical, mineralogical, and textural changes in rocks above described may be collectively referred to as metamorphism. The rock has undergone complete metamorphism and its origin is unknown. The metamorphism is related not only to overthrusting and the obduction of oceanic crust but also to a subduction zone setting. Sharygin said that of the many fragments we've been analysing, only three dark samples show strong evidence of earlier metamorphism and melting. This is called contact metamorphism or thermal metamorphism. Nor is the metamorphism of the invaded rock limited to simple intrusion. How is metamorphism on the large scale supposed to have been induced? The metamorphism is more striking in the first change than in the second. Show More Sentences This state of things is called general, or normal, metamorphism. Find more words! 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Use our Sentence Generator Nearby Words metamorphic rocks metamorphic rock metamorphic metamorph metamessage metamerism metamorphose metamorphosed metamorphoses Metamorphoses metamorphosing metamorphosis 12-letter Words Starting With m me met meta metam metamo metamor metamorp metamorph metamorphi metamorphis