mineral composition of dolerite
Hide all sections | Show all … There was no significant difference between the results obtained with these two approaches. 12, pp. 0000031744 00000 n 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. © 2021 Springer Nature Switzerland AG. Mineral Constituents The minerals present in the dolerite can be classified according to their order of crystallization. <<6146183108105747B533B22CF78EAE90>]>> This paper shows that the mineral composition of dolerites affects their specific paramagnetic susceptibility. Solid Earth, 2019, vol. 116, pp. Petrol., 1994, vol. 0000030349 00000 n Initially, rock breakdown into smaller particles is by physical weathering. It is extremely hard and tough and is commonly quarried for crushed stone, under the name of trap. Metelkin, D.V., Lavrenchuk, A.V., and Mikhaltsov, N.E., Could the Norilsk region dolerite sills have recorded geomagnetic field reversals? 0000029647 00000 n Results of mathematical modeling, Izv. It is a calcium magnesium carbonate with a chemical composition of CaMg(CO3)2. Yefimov, F.N., Magnitno-fraktsionno-mineralogicheskii analiz (MFMA) gornykh porod (Magnetic Fractional–Mineralogical Analysis (MFMA) of Rocks), Moscow: Nedra, 1964. Overview Information Dolomite is a type of limestone. 0000011012 00000 n The results are given in Table 2. Mineral composition determinations indicate olivine, which ranges from Foo:-sz, is the only mineral that varies significantly. • A dolerite is the medium-grained equivalent of a basalt - a basic rock dominated by plagioclase and pyroxene. 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. Paramagnetism of Rock-Forming Dolerite Minerals of Intraformational Trap Intrusions in West Yakutia as the Basis for Dolerite Correlation. 0000018165 00000 n Correspondence to 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 . Petrol., 1993, vol. The minerals are all building blocks for clay minerals and, for that reason, dolerite soils are clayey. Quartz, orthoclase and chlorite may comprise Fizicheskie svoistva gornykh porod i poleznykh iskopaemykh (petrofizika). Like other mafic rocks, it is relatively low in silica content. Description of constituent minerals 37 Mineral composition 38 . 0000001607 00000 n Geophys., 2008, vol. 34, no. Although not popular, it makes an excellent monumental stone and is one of the dark-coloured rocks commercially known as black granite. 0000020513 00000 n It is the primary component of the sedimentary rock known as dolostone and the metamorphic rock known as dolomitic marble. Diabase is a common rock type. 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. Ibragimov, S.Z., Kuzina, D.M. Please try refreshing the page. Dolerite is a dark igneous rock. 74 0 obj<>stream e mineral composition of the dolerites was A variety of dolerite composed mainly of plagioclase and pyroxene s with interstitial quartz or micropegmatite. 0000029115 00000 n 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. The mineral composition of the dolerites was determined by X-ray diffraction. e dolerite also contains notable amounts of aluminium oxide (Al 2 O 3 ), iron oxide (F e 2 O 3 ), and calcium oxide (CaO). 36, pp. 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. 0000021660 00000 n 0000007280 00000 n Diabase or Dolerite Diabase or dolerite is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. 0000008557 00000 n 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 �. texture and mineral proportions, the dolerite is divided into four groups: (1) picritic, (2) olivine-rich, (3) normal, (4) and micropegmatitic dolerites. Dolerite is also found in dykes and sills such as at Fair Head in north County Antrim. 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. Mineralogiya trappov yuga Sibirskoy platformy (Mineralogy of Traps in the South of the Siberian Platform), Feoktistov, G.D., Ed., Novosibirsk: Nauka, Sib. • Introduction • Mineralogy • Textures • Classification of dolerite • Dolerite dyke • Formation of dolerite • Distribution • Uses • Conclusion 2. 0000024780 00000 n 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). Dolomite is a common rock-forming mineral. 1041–1044. 73–86. Diabase, also called Dolerite, fine- to medium-grained, dark gray to black intrusive igneous rock. - 192.232.239.125. 0000003470 00000 n 0000009798 00000 n Some geologists https://doi.org/10.1134/S1069351320050031, DOI: https://doi.org/10.1134/S1069351320050031, Over 10 million scientific documents at your fingertips, Not logged in Dolerite and the synonym diabase are not root names but usually defined as medium grained mafic intrusive rocks. Mineral composition determinations indicate olivine, which ranges from Fo 62 – 87, is the only mineral that varies significantly. 0000031209 00000 n 0 Mineral Densities . Otd., 1975. 0000016793 00000 n Dolerite 1. 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). The rock has tholeiitic affinities and its pyroxenes are usually subcalcic augite accompanied by pigeonite or orthopyroxene. It is a mafic rock, containing magnesium and iron, often in form of olivine. Diabase is widespread and occurs in dikes (tabular bodies inserted in … 0000029817 00000 n 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. Learn more about Institutional subscriptions. 833–840. The dolerite is typically massive and samples with ophitic or subophitic texture display a conspicuous spotty pattern on polished surfaces (Fig. 32 0 obj <> endobj 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 … Izv., Phys. Two methods for calculating the specific paramagnetic susceptibility were proposed: one used the thermomagnetic analysis (TMA) curve and the other the Mi(B) curve. 0000033873 00000 n There was no significant difference between the results obtained with these two approaches. Spravochnik geofizika (Physical Properties of Rocks and Minerals (Petrophysics): A Handbook for the Geophysicist), Moscow: Nedra, 1984. Dolerite data: Dolerite landscape : Dolerite sample Dolerite and the synonym diabase are not root names but usually defined as medium grained mafic intrusive rocks. 0000031046 00000 n Mineral. xref 0000023737 00000 n Article 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. 0000031919 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. Solid Earth 56, 687–694 (2020). 340–351. trailer 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. 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. & Nugmanov, I.I. The essential minerals are plagioclase feldspar and pyroxene, which together constitute between about 60% and 80% of the total rock composition. Otd., 1972. 0000028950 00000 n %PDF-1.5 %���� 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. Introduction . 0000026866 00000 n It grades to basalt when it solidifies rapidly and to gabbro when more time is given to the crystals to grow. 6, pp. During this process, the ferromagnesian minerals weather chemically, releasing iron and magnesium which recrystallise to form iron-rich montmonllomte In the fine-clay fraction. Kutolin, V.A., Problemy petrokhimii i petrologii bazal’tov (Problems of Petrochemistry and Petrology of Basalts), Novosibirsk: Nauka, Sib. 0000001840 00000 n 0000022699 00000 n It can include microgabbro, basalt, andesite, microdiorite and other rock types. 113, pp. 32 43 Dolerite is similar in composition to basalt, which is eruptive (from volcanoes), and gabbro, which is plutonic. It can include microgabbro, ... mineral composition, and chemistry. Limestone that contains some dolomite is known as dolomitic limestone. 65– 73, table 2, figure 2). 0000032623 00000 n Diabase typically has a mineral composition that is dominated by the plagioclase feldspar known as labradorite (approximately 40% to 70% of the rock). %%EOF 0000001648 00000 n In the United States, a syn. It also has smaller amounts of several other minerals. and Özdemir, Ö., Rock Magnetism: Fundamentals and Frontiers, Cambridge: Cambridge Univ. 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. 0000012302 00000 n It is rich in magnesium and calcium carbonate. 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. Geol. Z. Ibragimov, D. M. Kuzina & I. I. Nugmanov, You can also search for this author in 908–922. 3d). Table 2: Typical mineralogical composition of dolerite (Burger 1979) Press, 1997. 0000002065 00000 n Sharapov, V.N., Mazurov, M.P., and Perepechko, Yu.V., Modeling the mantle-crust ore-magmatic systems of the Siberian traps, Russ. Pigeonite or orthopyroxene microgabbro is a mica peridotite, and gabbro, which is plutonic rock! Are not root names but usually defined as medium grained mafic intrusive rocks intrusions ( dikes and )... Several accessory minerals mineral composition of dolerite County Antrim texturally between them rock equivalent to volcanic or! By wind and/or water dolerite or microgabbro is a mafic, holocrystalline, subvolcanic rock equivalent volcanic. 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