Diabase is the preferred name in North America, while dolerite is the preferred name in the rest of English-speaking world, where sometimes the name diabase is applied to altered dolerites and basalts. 0000023737 00000 n Please try refreshing the page. 0000015321 00000 n Although not popular, it makes an excellent monumental stone and is one of the dark-coloured rocks commercially known as black granite. Press, 1997. Limestone that contains some dolomite is known as dolomitic limestone. 55, no. The mineral composition of the dolerites was determined by X-ray diffraction. 49, no. As nouns the difference between basalt and dolerite is that basalt is (mineral) a hard mafic igneous rock of varied mineral content; volcanic in origin, it makes up much of the earth's oceanic crust while dolerite is (geology) a fine-grained basaltic rock. Geophys., 2008, vol. The researchers wondered about the origins of the dolerite bluestones that Thomas had identified, and took a second look at the mineral composition of the rocks. Diabase typically has a mineral composition that is dominated by the plagioclase feldspar known as labradorite (approximately 40% to 70% of the rock). Mineral composition determinations indicate olivine, which ranges from Fo 62 – 87, is the only mineral that varies significantly. 3c). 36, pp. Diorite is defined as follows (p.198): a group of plutonis rocks intermediate in composition between acidic and basic rocks, characteristically Other abundant minerals include phlogopite mica; chromium- and pyrope-rich garnet phenocrysts; chrome-bearing diopside , particularly in the African kimberlite; ilmenite; serpentine; calcite; and magnetite . Diabase (dolerite) is a dark-colored igneous rock. 0000029115 00000 n 833–840. Mineralogiya trappov yuga Sibirskoy platformy (Mineralogy of Traps in the South of the Siberian Platform), Feoktistov, G.D., Ed., Novosibirsk: Nauka, Sib. <<6146183108105747B533B22CF78EAE90>]>> of diabase Ref: AGI ii. Thy, P. and Lofgren, G.E., Experimental constraints on the low-pressure evolution of transitional and mildly alkalic basalts: the effect of Fe–Ti oxide minerals and the origin of basaltic andesites, Contrib. Initially, rock breakdown into smaller particles is by physical weathering. Discussion 44 References 45 . The Amata Dolerite has a medium grey to greenish grey colour on freshly broken surfaces and typically consists of interlocking white plagioclase crystals and dark coloured mafic minerals (Fig. Results of mathematical modeling, Izv. dolerite {Initial Core Descriptions) is slight, since the chemical composition of this glass (microprobe data, Melson, this volume) resembles more closely that of the underlying aphyric basalts than that of the dolerite. In context|geology|lang=en terms the difference between rock and dolerite is that rock is (geology) any natural material with a distinctive composition of minerals while dolerite is (geology) a fine-grained basaltic rock. a dark basic intrusive igneous rock consisting of plagioclase feldspar and a pyroxene, such as augite; often emplaced in dykes any dark igneous rock whose composition cannot be determined with the … Some geologists 0000029647 00000 n Diabase or dolerite or microgabbro is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. 0000005996 00000 n The results are given in Table 2. The accessory minerals are quartz, orthoclase, chlorite and magnetite. 6, pp. 0000031919 00000 n 0000008557 00000 n Dunlop, D.J. Google Scholar. 0000002065 00000 n volume 56, pages687–694(2020)Cite this article. Handbook for A Geophysicist), 2nd ed., Dortman, N.B., Ed., Moscow: Nedra, 1984. 32 0 obj <> endobj Geol. Minor amounts of hornblende, olivine, magnetite, and quartz can be found in some diabase rocks. 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). It can include microgabbro, ... mineral composition, and chemistry. 0000028950 00000 n Article  3d). 0000012302 00000 n The data on the mineral composition and crystallization conditions of magnesian skarn and magnetite ore at contacts of dolerite with rock salt and dolomite in ore-bearing volcanic—tectonic structures of the Angara—Ilim type have been integrated and systematized. 0000032623 00000 n Dolerite is composed of two essential and several accessory minerals. The minerals are all building blocks for clay minerals and, for that reason, dolerite soils are clayey. 0000009798 00000 n Diabase is a common rock type. Mineral. intrusive igneous rock of the composition of diabase as defined in the U.S. but which has been altered by the decomposition of feldspars and mafic minerals. 12. pp. Description of constituent minerals 37 Mineral composition 38 . Two methods for calculating the specific paramagnetic susceptibility were proposed: one used the thermomagnetic analysis (TMA) curve and the other the Mi(B) curve. • Introduction • Mineralogy • Textures • Classification of dolerite • Dolerite dyke • Formation of dolerite • Distribution • Uses • Conclusion 2. Kutolin, V.A., Problemy petrokhimii i petrologii bazal’tov (Problems of Petrochemistry and Petrology of Basalts), Novosibirsk: Nauka, Sib. Snyder, D., Carmichael, I.S.E., and Wiebe, R.A., Experimental study of liquid evolution in a Fe-rich, layered mafic intrusion: constraints of the Fe–Ti oxide precipitation on the T-fO2 and T-ϱ paths of tholeiitic magmas, Contrib. It can include microgabbro, basalt, andesite, microdiorite and other rock types. Phys. The composition of titanomagnetites in dolerites can be used as an accessory parameter. Diabase is widespread and occurs in dikes (tabular bodies inserted in … Abstract Chemical weathering taking place in a soil formed on till derived solely from dolerite was investigated. 0000018165 00000 n startxref Much of the dolerite found in these places has a greenish tinge because of the presence of the mineral olivine. 65– 73, table 2, figure 2). 1137–1170. PubMed Google Scholar. Diabase, also called Dolerite, fine- to medium-grained, dark gray to black intrusive igneous rock. https://doi.org/10.1134/S1069351320050031. - 192.232.239.125. The essential minerals are plagioclase feldspar and pyroxene, which together constitute between about 60% and 80% of the total rock composition. Metelkin, D.V., Lavrenchuk, A.V., and Mikhaltsov, N.E., Could the Norilsk region dolerite sills have recorded geomagnetic field reversals? The dolerite also contains notable amounts of aluminium oxide (Al 2 O 3), iron oxide (Fe 2 O 3), and calcium oxide (CaO). Solid Earth, 1998, vol. It also has smaller amounts of several other minerals. 0000027918 00000 n It is the primary component of the sedimentary rock known as dolostone and the metamorphic rock known as dolomitic marble. texture and mineral proportions, the dolerite is divided into four groups: (1) picritic, (2) olivine-rich, (3) normal, (4) and micropegmatitic dolerites. 0000033158 00000 n Quartz, orthoclase and chlorite may comprise Dolerite and the synonym diabase are not root names but usually defined as medium grained mafic intrusive rocks. 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. Tax calculation will be finalised during checkout. 0000020513 00000 n Solid Earth, 2019, vol. 0000030349 00000 n Introduction . 32 43 Mineral Constituents The minerals present in the dolerite can be classified according to their order of crystallization. Petrol., 1993, vol. %%EOF It is compositionally equivalent to gabbro and basalt but texturally between them. Dolerite data: Dolerite landscape : Dolerite sample There was no significant difference between the results obtained with these two approaches. 0000026866 00000 n Solid Earth 56, 687–694 (2020). Ibragimov, Sh.Z., Yasonov, P.G., and Denisov, I.G., A component expansion of the temperature-dependent saturation magnetization of a ferrimagnetic fraction of rocks, Izv. 0000022699 00000 n 0000021660 00000 n 73–86. These larger occurrences of dolerite mostly contain pyroxene as the dominant ferromagnesian mineral and are largely the rock called "diabase" by petrographers, while cases where hornblende is dominant are mostly confined to dikes and smaller intrusions, especially in the older rocks. 0000011012 00000 n 12, pp. 0000001607 00000 n It occurs mostly in shallow intrusions (dikes and sills) of basaltic composition. 0000007280 00000 n 0000032454 00000 n 0000001648 00000 n This is a preview of subscription content, log in to check access. On the basis of texture and mineral proportions, the dolerite is divided into four groups: (1) picritic, (2) olivine-rich, (3) normal, (4) and micropegmatitic dolerites. 0000016793 00000 n 340–351. Sharapov, V.N., Mazurov, M.P., and Perepechko, Yu.V., Modeling the mantle-crust ore-magmatic systems of the Siberian traps, Russ. & Nugmanov, I.I. 0000013941 00000 n There was no significant difference between the results obtained with these two approaches. 34, no. Izvestiya, Physics of the Solid Earth i. Otd., 1972. • A dolerite is the medium-grained equivalent of a basalt - a basic rock dominated by plagioclase and pyroxene. Dolomite is a common rock-forming mineral. Dolerite 1. 0000031046 00000 n 0000001840 00000 n The study was financed by a subsidy allocated as part of the state support to Kazan (Volga Region) Federal University in order to improve its competitiveness among the world’s leading research and educational centers. and Özdemir, Ö., Rock Magnetism: Fundamentals and Frontiers, Cambridge: Cambridge Univ. The rock has tholeiitic affinities and its pyroxenes are usually subcalcic augite accompanied by pigeonite or orthopyroxene. of the dolerite. The differing crystal sizes are due to the different rate of cooling, basalt cools quickly and has a very fine structure, while gabbro cools very slowly, at great … Novyi spravochnik khimika i tekhnologa: Syr’yo i produkty promyshlennosti organicheskikh i neorganicheskikh veshchestv (New Handbook of Chemist and Technologist: Raw Materials and Products of the Industry of Organic and Inorganic Substances), Part I, Pokonova, Yu.V., Ed., St. Petersburg: ANO NPO “Mir i sem’ya,” ANO MPO “Professional,” 2002. An accessory parameter dolerite or microgabbro is a mafic rock, containing magnesium and iron, often form... Their specific paramagnetic susceptibility to medium-grained, dark gray to black intrusive rock! By pigeonite or orthopyroxene svoistva gornykh porod i poleznykh iskopaemykh ( petrofizika.... Diabase dikes and sills are typically shallow intrusive bodies and mineral composition of dolerite exhibit fine grained to aphanitic chilled margins may... 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