DIABASE, in petrology, a rock which is a weathered form of dolerite. Italy; Important Notice: The Drugs.com international database is in BETA release. Rocks found in the Palisades are known as diabase and were formed during the Triassic period around 200 million years ago. The dike exposed here runs through downtown Garner, roughly along Creech Road, passing along the west edge of Southeast Raleigh High School, and through Southgate Park. The first stop on my first fieldtrip with the northeast section of the Geological Society of America visited a diabase outcrop in jungle of a different kind than I m used to. This contraction causes the rock to break in a particular pattern called “columnar jointing.” The unique shape of the diabase boulder (a rectangular prism) is a result of breaking through columnar jointing. Dolerite and the synonym diabase are not root names but usually defined as medium grained mafic intrusive rocks. Diabase glossary term at minerals.net educational reference guide Dibase may be available in the countries listed below. Diabase is an intrusive igneous rock with the same mineral composition as basalt. Although dike formation and magma cooling in dikes have not been observed and timed, prolific studies have still been directed towards understanding the mechanism of magma intrusion to form dikes and the timing of magma cooling in them. Where does diabase form? Diabase (also known as dolerite or microgabbro) is an igneous rock that is often blue in colour. Porphyritic diabase from Massachusetts, USA. 2 Find all words containing diabase Words found within diabase through unscramble Buttermilk Falls Park is location in a portion of the Palisades ridge north of the Sparkill Gap.The Palisades are located along the western shoreline of the Hudson River in southeastern New York and in north eastern New Jersey. Diabase definition is - diorite. In the United States, a syn. If this happens at or near the land surface, or on the seafloor, they are extrusive igneous rocks. It includes part of what was early called greenstone. The crystals formed diabase can be seen with naked eyes but in some conditions porphyritic rocks in which their basaltic combination is pyroxene or especially plagioclase phenocrysts stones can be named as diabase. It cools under basaltic volcanoes, like those at mid-ocean ridges. The diabase, lamprophyre, granite … A second rock type commonly occurs in the Triassic basins. Some 195 million years later William & Mary alum R. Lee Aston (’50) began quarrying diabase (black granite in the trade) for dimension stone near Rapidan. Diabase is a synonym of dolerite. Diabase is a subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. 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). Deep … Recent Examples on the Web It’s made of diabase traprock, which contains iron that causes the cliffs to look lumpen and rusty in the wrong light, precise and resplendent in the right one. of diabase Ref: AGI Diabase is a rock formed by the cooling of magma at some depth in the crust; basalt is formed by cooling of an identicalmagma that has been extruded onto the surface as lava. The diabase and lamprophyre are typical mantle source rock while the granite pegmatite is typical crustal source rock. Diabase forms when molten igneous rock is squeezed up into a vertical crack in other rocks, the crack is usually forced apart and the molten rock cools in the space to form a tabular igneous intrusion cutting across the surrounding rocks and is known as a dike. Diabase is usually found in smaller relatively shallow intrusive bodies such as dikes and sills. Phaneritic , mafic intrusive igneous rock formed from the slow cooling of magnesium-rich and iron-rich magma into a holocrystalline mass deep beneath the Earth's surface. views 2,826,588 updated Nov 5 2020 dolerite (diabase, microgabbro) A dark-coloured, medium-grained igneous rock which contains plagioclase feldspar of labradorite composition and pyroxene of augite or titanaugite composition as essential minerals, and magnetite, titano-magnetite, or ilmenite as accessory minerals. 792771 1911 Encyclopædia Britannica, Volume 8 — Diabase. Diabase is typically fine grained having a chilled margin. Both basalt and diabase are more resistant to erosion than the enclosing sandstone and shale, and therefore they form … The country rock is the Proterozoic Crystal Spring Formation. This rock formed from magma but never made it to the surface as lava. If this happens deep underground, they are intrusive igneous rocks. DIABASE, in petrology, a rock which is a weathered form of dolerite. See more. The molten rock (magma) crystallizes as it cools, the most common dike rocks being diabase (or dolerite), basalt, and fine-grained granitic rocks. (5.3 cm across at its widest) Igneous rocks form by the cooling & crystallization of hot, molten rock (magma & lava). One of the reasons is grain size. Diabase is a hypabyssal rock that is interspersed throughout the primary rock in Sweden. 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. i. 1. Colecalciferol is reported as an ingredient of Dibase in the following countries:. diabase diabase (countable and uncountable, plural diabases) (geology) A fine-grained igneous rock composed mostly of pyroxene and feldspar. 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. It is an igneous rock called diabase that is Jurassic in age, younger than the Triassic sedimentary rocks. Travels Diabase and basalt. When they cool from molten to a solid, both contract strongly. 2. Diabase is indeed relatively erosion resistant. Figure 5: Two images of sides of different diabase boulders. / or dolerite or microgabbro is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. It is rich in magnesium and iron , and originally found under the crust of volcanoes . You can see that the boulders have a roughly rectangular prism shape, which is due … Dibase. DIABASE A dark igneous rock formed at medium to shallow depths within the crust. The fieldtrip mission focused on visiting contacts between sedimentary rocks and the diabases [1] and basalts of New York City and northern New Jersey. Dolerite definition, a coarse-grained variety of basalt. It was long widely accepted that the pre-Tertiary rocks of this group differed from their Tertiary and Recent representatives in certain essential respects, but this is now admitted to be untenable, and the differences are known to be merely the result of the longer exposure to … These igneous rocks formed as Virginia’s crust thinned and ripped apart, labor pains at the birth of the Atlantic Ocean. Eastern U.S. In diabase, poorly formed pyroxene crystals wrap around ormold against long, rectangular plagioclase crystals to give it the characteristic texture known asdiabasic or ophitic. - A basic, dark-colored, holocrystalline, igneous rock, consisting essentially of a triclinic feldspar and pyroxene with magnetic iron; -- often limited to rocks pretertiary in age. Dikes and sills in igneous rock are often made of diabase. In areas where no diabase rocks intruded, the soft sediments eroded down forming valleys, such as the flat land seen today along the the Kaministiquia and Slate Rivers. The diabase has been compressed by the surrounding … Throughout the Death Valley region, talc deposits formed at the contact of the diabase sills and dolomite of the Crystal Spring Formation. Diabase was formed when magma from the earth’s interior penetrated into cracks in the primary rock and then solidified. Diabase is subsurface volcanic rock formed by injecting gabbroic magma or lava as shallow dykes and sills under the surface of Earth. Diabase / ˈ d aɪ . Diabase or dolerite or microgabbro is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. Likewise, the soil formed from these rocks does not readily transmit or soak up water. Basalt has a strict chemical definition. 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