Mineral Constituents The minerals present in the dolerite can be classified according to their order of crystallization. The dolerite also contains notable amounts of aluminium oxide (Al 2 O 3), iron oxide (Fe 2 O 3), and calcium oxide (CaO). A variety of dolerite composed mainly of plagioclase and pyroxene s with interstitial quartz or micropegmatite. 65– 73, table 2, figure 2). There was no significant difference between the results obtained with these two approaches. There was no significant difference between the results obtained with these two approaches. Much of the dolerite found in these places has a greenish tinge because of the presence of the mineral olivine. Dolerite is also found in dykes and sills such as at Fair Head in north County Antrim. Dunlop, D.J. Geol. 0000025821 00000 n Hornblendeoccupies around 60% of the rock and shows different schemes of pleochroism from colourless to light green and green to greenish brown.Compositionally,theyaremostlymagnetio- hornblende to ferro-tschermackite through tscher- mackite hornblende and tschermackite (mg no. Z. Ibragimov or D. M. Kuzina or I. I. Nugmanov. 0 Feoktistov, G.D., Ushchapovskaya, Z.F., Vasil’ev, V.K., Lakhno, T.A., Elizar’eva, T.I., et al., Fizicheskie svoistva gornykh porod i poleznykh iskopaemykh (petrofizika): Spravochnik geofizika (Physical Properties of Rocks and Minerals (Petrophysics). Results of mathematical modeling, Izv. Geophys., 2008, vol. Dolerite and the synonym diabase are not root names but usually defined as medium grained mafic intrusive rocks. Dolerite and the synonym diabase are not root names but usually defined as medium grained mafic intrusive rocks. Ariskin, A.A. and Barmina, G.S., Modelirovanie fazovykh ravnovesii pri kristallizatsii bazal’tovykh magm (Modeling Phase Equilibria during Crystallization of Basaltic Magmas), Moscow: Nauka, 2000. Phys. It is extremely hard and tough and is commonly quarried for crushed stone, under the name of trap. 0000005996 00000 n Solid Earth, 2019, vol. 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. %%EOF Yefimov, F.N., Magnitno-fraktsionno-mineralogicheskii analiz (MFMA) gornykh porod (Magnetic Fractional–Mineralogical Analysis (MFMA) of Rocks), Moscow: Nedra, 1964. Mineral composition determinations indicate olivine, which ranges from Foo:-sz, is the only mineral that varies significantly. https://doi.org/10.1134/S1069351320050031, DOI: https://doi.org/10.1134/S1069351320050031, Over 10 million scientific documents at your fingertips, Not logged in Z. Ibragimov, D. M. Kuzina & I. I. Nugmanov, You can also search for this author in Limestone that contains some dolomite is known as dolomitic limestone. 0000016793 00000 n It can include microgabbro, basalt, andesite, microdiorite and other rock types. 0000001486 00000 n The accessory minerals are quartz, orthoclase, chlorite and magnetite. 0000001648 00000 n It grades to basalt when it solidifies rapidly and to gabbro when more time is given to the crystals to grow. 0000024780 00000 n Overview Information Dolomite is a type of limestone. Ibragimov, S.Z., Kuzina, D.M. • Introduction • Mineralogy • Textures • Classification of dolerite • Dolerite dyke • Formation of dolerite • Distribution • Uses • Conclusion 2. It is a mica peridotite, and its most abundant mineral constituent is olivine. 0000029647 00000 n 0000031919 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. - 192.232.239.125. 0000032454 00000 n Article  The rock has tholeiitic affinities and its pyroxenes are usually subcalcic augite accompanied by pigeonite or orthopyroxene. texture and mineral proportions, the dolerite is divided into four groups: (1) picritic, (2) olivine-rich, (3) normal, (4) and micropegmatitic dolerites. It is compositionally equivalent to gabbro and basalt but texturally between them. Diabase is widespread and occurs in dikes (tabular bodies inserted in … Please try refreshing the page. Minor amounts of hornblende, olivine, magnetite, and quartz can be found in some diabase rocks. Petrol., 1995, vol. x�b```a``Uc`c`V;� Ȁ ��@Q�o�����&E&�N��` ���e���ՁX�=}a!�L�|7pz1�:���b��@8�Y�!8�[���A)���������}����� ��7��Oa�m�`x�P������ �[�F.�*�g@+���)� ��fqX�@Ҍ�a����G �. Diabase, also called Dolerite, fine- to medium-grained, dark gray to black intrusive igneous rock. Paramagnetism of Rock-Forming Dolerite Minerals of Intraformational Trap Intrusions in West Yakutia as the Basis for Dolerite Correlation. 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. Diabase is a common rock type. Solid Earth, 1998, vol. Dolerite data: Dolerite landscape : Dolerite sample https://doi.org/10.1134/S1069351320050031. of diabase Ref: AGI ii. The results are given in Table 2. 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. Diabase dikes and sills are typically shallow intrusive bodies and often exhibit fine grained to aphanitic chilled margins which may contain tachylite. 12, pp. e dolerite also contains notable amounts of aluminium oxide (Al 2 O 3 ), iron oxide (F e 2 O 3 ), and calcium oxide (CaO). <<6146183108105747B533B22CF78EAE90>]>> 32 43 116, pp. 0000000016 00000 n Abstract Chemical weathering taking place in a soil formed on till derived solely from dolerite was investigated. Diabase or Dolerite Diabase or dolerite is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. Dolomite is a common rock-forming mineral. The minerals are all building blocks for clay minerals and, for that reason, dolerite soils are clayey. 0000015321 00000 n Mineral composition and emplacement of the dolerite 41 Thermal disturbance of the surrounding sediments 43 . 0000028950 00000 n The essential minerals are plagioclase feldspar and pyroxene, which together constitute between about 60% and 80% of the total rock composition. 0000033158 00000 n 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. Dolerite is composed of two essential and several accessory minerals. 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. 0000021660 00000 n As a general rule, non-metallic minerals have low densities while metallic minerals have high densities. We’re sorry, something doesn't seem to be working properly. 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. It is the primary component of the sedimentary rock known as dolostone and the metamorphic rock known as dolomitic marble. 0000032623 00000 n 0000008557 00000 n Institute of Geology and Petroleum Technologies, 420008, Kazan, Russia, Sh. Dolerite is a dark igneous rock. i. 0000019313 00000 n 0000013941 00000 n %PDF-1.5 %���� It occurs mostly in shallow intrusions (dikes and sills) of basaltic composition. 0000031209 00000 n The composition of titanomagnetites in dolerites can be used as an accessory parameter. 0000001607 00000 n Mineral. 0000011012 00000 n and Özdemir, Ö., Rock Magnetism: Fundamentals and Frontiers, Cambridge: Cambridge Univ. Diabase or dolerite or microgabbro is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. 0000023737 00000 n If that doesn't work, please contact support so we can address the problem. startxref 113, pp. & Nugmanov, I.I. Metelkin, D.V., Lavrenchuk, A.V., and Mikhaltsov, N.E., Could the Norilsk region dolerite sills have recorded geomagnetic field reversals? Sh. Frenkel’, M.Ya., Yaroshevskii, A.A., Ariskin, A.A., Barmina, G.S., Koptev-Dvornikov, E.V., and Kireev, B.S., Dinamika vnutrikamernoi differentsiatsii bazitovykh magm (Dynamics of Intrachamber Differentiation of Basic Magmas), Yaroshevskii, A.A., Ed., Moscow: Nauka, 1988. Otd., 1975. 0000022699 00000 n Part of Springer Nature. Mineral. Learn more about Institutional subscriptions. Description of constituent minerals 37 Mineral composition 38 . 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. 0000012302 00000 n During this process, the ferromagnesian minerals weather chemically, releasing iron and magnesium which recrystallise to form iron-rich montmonllomte In the fine-clay fraction. 0000033873 00000 n 73–86. It is a mafic rock, containing magnesium and iron, often in form of olivine. 0000004760 00000 n Like other mafic rocks, it is relatively low in silica content. The dolerite is typically massive and samples with ophitic or subophitic texture display a conspicuous spotty pattern on polished surfaces (Fig. Google Scholar. 3c). 0000029817 00000 n Spravochnik geofizika (Physical Properties of Rocks and Minerals (Petrophysics): A Handbook for the Geophysicist), Moscow: Nedra, 1984. Some geologists 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. 0000030349 00000 n 49, no. 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. In the United States, a syn. Kutolin, V.A., Problemy petrokhimii i petrologii bazal’tov (Problems of Petrochemistry and Petrology of Basalts), Novosibirsk: Nauka, Sib. 0000031046 00000 n 0000031744 00000 n 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. 1041–1044. This paper shows that the mineral composition of dolerites affects their specific paramagnetic susceptibility. The mineral composition of the dolerites was determined by X-ray diffraction. Sharapov, V.N., Mazurov, M.P., and Perepechko, Yu.V., Modeling the mantle-crust ore-magmatic systems of the Siberian traps, Russ. 1137–1170. Most of the remainder is made up of pyroxene minerals (usually augite). Tax calculation will be finalised during checkout. 0000020513 00000 n Two methods for calculating the specific paramagnetic susceptibility were proposed: one used the thermomagnetic analysis (TMA) curve and the other the Mi(B) curve. 0000033338 00000 n It is a calcium magnesium carbonate with a chemical composition of CaMg(CO3)2. 0000026866 00000 n Fizicheskie svoistva gornykh porod i poleznykh iskopaemykh (petrofizika). 0000003470 00000 n volume 56, pages687–694(2020)Cite this article. 0000001840 00000 n Introduction . 74 0 obj<>stream 0000007280 00000 n Quartz, orthoclase and chlorite may comprise Dolerite is similar in composition to basalt, which is eruptive (from volcanoes), and gabbro, which is plutonic. 36, pp. 0000002065 00000 n Application of the proposed methods to dolerite core samples showed that specific paramagnetic susceptibility can be used as the basis for correlation of sills. Diorite is defined as follows (p.198): a group of plutonis rocks intermediate in composition between acidic and basic rocks, characteristically Hide all sections | Show all … Dolerite 1. Petrol., 1993, vol. 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. Phys. 3d). xref This paper shows that the mineral composition of dolerites affects their specific paramagnetic susceptibility. Izvestiya, Physics of the Solid Earth It also has smaller amounts of several other minerals. Mineral Densities . This is a preview of subscription content, log in to check access. PubMed Google Scholar. 0000029115 00000 n 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. 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. 12. pp. 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. It can include microgabbro, ... mineral composition, and chemistry. Petrol., 1994, vol. Diabase (dolerite) is a dark-colored igneous rock. Initially, rock breakdown into smaller particles is by physical weathering. Although not popular, it makes an excellent monumental stone and is one of the dark-coloured rocks commercially known as black granite. Otd., 1972. 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 … 0000018165 00000 n trailer 6, pp. 32 0 obj <> endobj 0000030514 00000 n 908–922. 0000027918 00000 n 55, no. The sand fraction comprises semi-weathered minerals and should quartz occur in the soil, it has been imported by wind and/or water. Diabase typically has a mineral composition that is dominated by the plagioclase feldspar known as labradorite (approximately 40% to 70% of the rock). 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. 0000001156 00000 n Izv., Phys. Discussion 44 References 45 . It is rich in magnesium and calcium carbonate. 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. Mineral composition determinations indicate olivine, which ranges from Fo 62 – 87, is the only mineral that varies significantly. 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 . e mineral composition of the dolerites was Correspondence to © 2021 Springer Nature Switzerland AG. • A dolerite is the medium-grained equivalent of a basalt - a basic rock dominated by plagioclase and pyroxene. of the dolerite. 340–351. Table 2: Typical mineralogical composition of dolerite (Burger 1979) Two methods for calculating the specific paramagnetic susceptibility were proposed: one used the thermomagnetic analysis (TMA) curve and the other the Mi(B) curve. 0000009798 00000 n Most of the major rock-forming minerals in the Earth's crust, like quartz, feldspar, and calcite, have very similar densities (around 2.6 to 3.0 g/cm 3). Press, 1997. 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). Handbook for A Geophysicist), 2nd ed., Dortman, N.B., Ed., Moscow: Nedra, 1984. Mineralogiya trappov yuga Sibirskoy platformy (Mineralogy of Traps in the South of the Siberian Platform), Feoktistov, G.D., Ed., Novosibirsk: Nauka, Sib. 833–840. 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 … 34, no. Toplis, M.J. and Carroll, M.R., An experimental study of the influence of oxygen fugacity on Fe–Ti oxide stability, phase relations, and mineral-melt equilibria in ferro-basaltic systems, J. Solid Earth 56, 687–694 (2020). … this paper shows that the mineral composition determinations indicate olivine, which ranges from Foo: -sz, the. Kuzina or I. I. 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