English: Diabase or Dolerite is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro.In North American usage, the term diabase refers to the fresh rock, whilst elsewhere the term dolerite is used for the fresh rock and diabase refers to altered material. The crushed-stone quarries that extract diabase are a substantial economic resource. Table 9.2 gives the classification of the bearing capacity of rock according to RQD. Trap rock (Basalt/Diabase) is composed primarily of silicates (plagioclase, pyroxene, and olivine); however, igneous rocks also contain a susbtantial proportion of crystalline silica (quartz or … Diabase/dolerite. ə b eɪ s / or dolerite or microgabbro is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. Get Price; Rock Types and Specific Gravity - Edumine Dolerite definition, a coarse-grained variety of basalt. This typically happens when volcanoes erupt. Sedimentary Rocks: Diabase (dolerite) is a dark-colored igneous rock. As nouns the difference between diabase and dolerite is that diabase is (geology) a fine-grained igneous rock composed mostly of pyroxene and feldspar while dolerite is (geology) a fine-grained basaltic rock. In current geologic usage diabase is preferred. Soils are derived from the weathering of the rocks. / or dolerite or microgabbro is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. Structure: Vesicles and amygdales occur. 3. There are defined belts of this rock, also known as trap rock, south of Leesburg and near Washington Dulles International Airport. diabase synonyms, diabase pronunciation, diabase translation, English dictionary definition of diabase. ) Dolerite is used as building material, concrete aggregate, paving stones and as an ornamental stone. It is rich in magnesium and iron, and originally found under the crust of volcanoes. Discover (and save!) Crushed quartzite is used in road construction and for railway ballast. In non North American usage dolerite is often preferred and diabase is used to refer to an altered dolerite. Grain size: Medium. It is used to make kitchen countertops and decorative walls. Dolerite and the synonym diabase are not root names but usually defined as medium grained mafic intrusive rocks. Relatively fine-grained gabbro is known as dolerite or diabase. Missouri stone aggregate producers have used the term “traprock” to describe fine-grained igneous rocks (diabase, volcanic rhyolite and ignimbrite). It can include microgabbro, basalt, andesite, microdiorite and other rock types. Jun 27, 2018 - This Pin was discovered by Bryn Mawr College Mineralogy. • Diabase is often used as a synonym of dolerite by american geologists, however, in europe the term is usually only applied to altered dolerites. The rocks diabase and basalt are discussed more specifically later on in this activity. Igneous Rocks - Diabase (Dolerite) Colour: When fresh it is black, dark-grey or green; may be mottled black and white. i. Diabase is a synonym of dolerite. Dikes and sills in igneous rock are often made of diabase. It grades to basalt when it solidifies rapidly and to gabbro when more time is given to the Crushed stone is often made of it and it seems to be a popular choice to use in sauna heaters. Prof. internet says, ‘In Great Britain the term “dolerite” was used … which has a meaning of a fresh-looking diabase and the term “diabase” itself was left … Dykes may also contain basalt instead of dolerite. Located near Sault Ste. Diabase is an expensive material to extract, says Bourque, and the company will be focussing on high-value uses to justify the cost of extraction. Dolerite is a synonym of diabase. See more. The Nipissing Diabase crops out largely in the Southern Province between Sault Ste Marie in the west and Cobalt in the east, and it is part of a large igneous province that includes the Seneterre dyke swarm that is linked to a plume head in Ungava (Fig. Image Courtesy: NASA. The term diabase was originally applied by A. Brongniart in 1807 for rocks later recognized as diorite. Basalt is an example of an extrusive rock. When they cool from molten to a solid, both contract strongly. Diabase / ˈ d aɪ . your own Pins on Pinterest The term diorite, and the commoner granodiorite, are used plenty, where the rocks themselves are plentiful. Diabase dikes and sills are typically shallow intrusive bodies and often exhibit fine grained to aphanitic chilled … Diabase dikes and sills are typically shallow intrusive bodies and often exhibit fine grained to aphanitic chilled margins which may contain tachylite (dark mafic glass). Diabase or dolerite or microgabbro is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. Diabase. Quartzite's strength and toughness lends itself to many uses. Diabase is a hypabyssal rock that is interspersed throughout the primary rock in Sweden. Define diabase. As per Wikipedia, “Igneous rock (derived from the Latin word ignis meaning fire) is one of the three main rock types, the others being sedimentary and metamorphic.Igneous rock is formed through the cooling and solidification of magma or lava. References This page was last changed on 12 July 2020, at 13:09. Diabase (also known as dolerite or microgabbro) is an igneous rock that is often blue in colour. Some authors use it to refer to an intrusive rock, commonly occurring as dykes and sills, whose main constituents are labradorite and pyroxene and whose texture is characteristically ophitic or subophitic. Description: Diabase Stone Material. Today, it’s mostly used in sculptures, flooring of certain buildings and for engineering purposes. At present it is working with a Finnish company which manufactures rock wool, an insulating material, in Sarnia. Extrusive rocks are formed when magma comes to Earth’s surface and cools rapidly. Diabase ( /ˈdaɪ.əbeɪs/) or dolerite or microgabbro is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. 5. Gabbroic rocks — the gabbros (sensu lato) of QAPF field 10, may be further subdivided according to the relative abundances of their orthopyroxene, clinopyroxene, olivine and hornblende as shown in Fig. May be porphyritic. Inscription controversy Diabase is a rock that is very similar in texture and composition to basalt; both are very common in the oceanic crust. In the rock formation where bedding planes, joints and other planes of weakness exist, the practice that is normally followed is to classify the rock according to RQD (Rock Quality Designation). The use of diabase in this sensewas abandoned in Britain in favor of dolerite for rocks of all ages by Allport (1874),[6] thoughsome British geologists continued to use diabase to describe slightly altered dolerite, in whichpyroxene has been altered to amphibole. • Dolerite is typically found as a hypabyssal igneous rock, typically within dykes. The very hard, durable nature of trap rock makes it ideally suited to the stringent specifications of railroads and high friction asphalt applications. Gabbro. Early Jurassic activity resulted in the formation of dolerite intrusion on Prospect Hill in Sydney, and quarrying of basalt for roadstone and other building materials has been an important activity there for over 180 years. 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