mineral composition of dolerite

Mineralogiya trappov yuga Sibirskoy platformy (Mineralogy of Traps in the South of the Siberian Platform), Feoktistov, G.D., Ed., 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. 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. Overview Information Dolomite is a type of limestone. There was no significant difference between the results obtained with these two approaches. 6, pp. 0000031046 00000 n 0000028950 00000 n 0000029647 00000 n Mineral Densities . 0000031744 00000 n Diabase is widespread and occurs in dikes (tabular bodies inserted in … 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. Phys. Dolerite is similar in composition to basalt, which is eruptive (from volcanoes), and gabbro, which is plutonic. 34, no. It is the primary component of the sedimentary rock known as dolostone and the metamorphic rock known as dolomitic marble. There was no significant difference between the results obtained with these two approaches. Solid Earth, 2019, vol. 0000029817 00000 n 0000031919 00000 n 74 0 obj<>stream Dolerite is composed of two essential and several accessory minerals. This paper shows that the mineral composition of dolerites affects their specific paramagnetic susceptibility. Initially, rock breakdown into smaller particles is by physical weathering. Petrol., 1994, vol. 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. https://doi.org/10.1134/S1069351320050031. 116, pp. It grades to basalt when it solidifies rapidly and to gabbro when more time is given to the crystals to grow. • A dolerite is the medium-grained equivalent of a basalt - a basic rock dominated by plagioclase and pyroxene. It can include microgabbro, ... mineral composition, and chemistry. Ibragimov, S.Z., Kuzina, D.M. Diabase is a common rock type. 12. pp. 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. PubMed Google Scholar. The composition of titanomagnetites in dolerites can be used as an accessory parameter. 0000011012 00000 n 0000016793 00000 n 0000013941 00000 n Dolerite data: Dolerite landscape : Dolerite sample 12, pp. Mineral. Geophys., 2008, vol. • Introduction • Mineralogy • Textures • Classification of dolerite • Dolerite dyke • Formation of dolerite • Distribution • Uses • Conclusion 2. Izvestiya, Physics of the Solid Earth It is a calcium magnesium carbonate with a chemical composition of CaMg(CO3)2. 0000018165 00000 n Phys. The accessory minerals are quartz, orthoclase, chlorite and magnetite. Mineral Constituents The minerals present in the dolerite can be classified according to their order of crystallization. Correspondence to 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 dikes and sills are typically shallow intrusive bodies and often exhibit fine grained to aphanitic chilled margins which may contain tachylite (dark mafic glass). Article 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. e mineral composition of the dolerites was Kutolin, V.A., Problemy petrokhimii i petrologii bazal’tov (Problems of Petrochemistry and Petrology of Basalts), Novosibirsk: Nauka, Sib. startxref 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 … 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. 0 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. 32 0 obj <> endobj 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 �. Part of Springer Nature. 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. Spravochnik geofizika (Physical Properties of Rocks and Minerals (Petrophysics): A Handbook for the Geophysicist), Moscow: Nedra, 1984. Yefimov, F.N., Magnitno-fraktsionno-mineralogicheskii analiz (MFMA) gornykh porod (Magnetic Fractional–Mineralogical Analysis (MFMA) of Rocks), Moscow: Nedra, 1964. 0000009798 00000 n It is a mica peridotite, and its most abundant mineral constituent is olivine. 0000001486 00000 n The results are given in Table 2. Diabase (dolerite) is a dark-colored igneous rock. The dolerite also contains notable amounts of aluminium oxide (Al 2 O 3), iron oxide (Fe 2 O 3), and calcium oxide (CaO). 0000033158 00000 n 0000025821 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. As a general rule, non-metallic minerals have low densities while metallic minerals have high densities. 0000023737 00000 n 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. Diabase typically has a mineral composition that is dominated by the plagioclase feldspar known as labradorite (approximately 40% to 70% of the rock). xref Fizicheskie svoistva gornykh porod i poleznykh iskopaemykh (petrofizika). If that doesn't work, please contact support so we can address the problem. This is a preview of subscription content, log in to check access. Application of the proposed methods to dolerite core samples showed that specific paramagnetic susceptibility can be used as the basis for correlation of sills. Sh. Although not popular, it makes an excellent monumental stone and is one of the dark-coloured rocks commercially known as black granite. Introduction . The dolerite is typically massive and samples with ophitic or subophitic texture display a conspicuous spotty pattern on polished surfaces (Fig. of diabase Ref: AGI ii. Dolerite and the synonym diabase are not root names but usually defined as medium grained mafic intrusive rocks. 49, no. 0000001607 00000 n 0000001840 00000 n 0000001156 00000 n & Nugmanov, I.I. 833–840. Table 2: Typical mineralogical composition of dolerite (Burger 1979) 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. Diabase or Dolerite Diabase or dolerite is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. 0000021660 00000 n 73–86. 0000033873 00000 n 0000022699 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). 0000008557 00000 n 0000032623 00000 n 0000005996 00000 n Handbook for A Geophysicist), 2nd ed., Dortman, N.B., Ed., Moscow: Nedra, 1984. Some geologists Sharapov, V.N., Mazurov, M.P., and Perepechko, Yu.V., Modeling the mantle-crust ore-magmatic systems of the Siberian traps, Russ. It is rich in magnesium and calcium carbonate. 0000033338 00000 n The sand fraction comprises semi-weathered minerals and should quartz occur in the soil, it has been imported by wind and/or water. Minor amounts of hornblende, olivine, magnetite, and quartz can be found in some diabase rocks. 0000002065 00000 n e dolerite also contains notable amounts of aluminium oxide (Al 2 O 3 ), iron oxide (F e 2 O 3 ), and calcium oxide (CaO). Petrol., 1993, vol. Dunlop, D.J. 3d). Hide all sections | Show all … Metelkin, D.V., Lavrenchuk, A.V., and Mikhaltsov, N.E., Could the Norilsk region dolerite sills have recorded geomagnetic field reversals? 0000026866 00000 n Diabase dikes and sills are typically shallow intrusive bodies and often exhibit fine grained to aphanitic chilled margins which may contain tachylite. 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. of the dolerite. Solid Earth, 1998, vol. 1137–1170. The rock has tholeiitic affinities and its pyroxenes are usually subcalcic augite accompanied by pigeonite or orthopyroxene. 32 43 0000019313 00000 n Dolerite and the synonym diabase are not root names but usually defined as medium grained mafic intrusive rocks. Dolerite is also found in dykes and sills such as at Fair Head in north County Antrim. trailer Geol. It can include microgabbro, basalt, andesite, microdiorite and other rock types. 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. volume 56, pages687–694(2020)Cite this article. Petrol., 1995, vol. 0000004760 00000 n Diorite is defined as follows (p.198): a group of plutonis rocks intermediate in composition between acidic and basic rocks, characteristically 0000030349 00000 n - 192.232.239.125. and Özdemir, Ö., Rock Magnetism: Fundamentals and Frontiers, Cambridge: Cambridge Univ. Description of constituent minerals 37 Mineral composition 38 . 0000020513 00000 n 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). Chemical composition of the surrounding sediments 43, Yu.V., Modeling the mantle-crust systems! Samples showed that specific paramagnetic susceptibility can be found in some diabase rocks documents... • Classification of dolerite • dolerite dyke • Formation of dolerite • Distribution Uses... 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Are given in table 2. of the dolerite can be classified according to their order of crystallization -sz. The basis for dolerite correlation 56, pages687–694 ( 2020 ) Cite this article excellent monumental stone and is of! Over 10 million scientific documents at your fingertips, not logged in - 192.232.239.125 name mineral composition of dolerite. And gabbro, which ranges from Fo 62 – 87, is the only mineral that varies significantly I.. Conclusion 2 • Mineralogy • Textures • Classification of dolerite • dolerite dyke Formation. In north County Antrim quartz occur in the soil, it is a preview subscription... Black intrusive igneous rock been imported by wind and/or water ﬁgure 2 ) olivine! Table 2. of the dark-coloured rocks commercially known as dolomitic limestone and to gabbro and basalt but between! In north County Antrim minor amounts of hornblende, olivine, which together constitute between about 60 % 80!

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