Diabase (/ˈdaɪ.əˌbeɪs/), also called dolerite (/ˈdɒl.əˌraɪt/) or microgabbro,is a mafic, holocrystalline, 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). The name …
carrière de diabase. Accueil carrière de diabase. ... VALLEY SILLS AND FLOWS, NORTHERN JUAN DE FUCA RIDGE1 ... The study focused on the 24 diabase samples from Site 857 that represent a continuous section from 471.1 mbsf, the first sill below the sediment cap, to 936.2 mbsf. The mean Vp of the 28 samples is 5.65 km/s and 5.77 …
The following terms incorporating diabase are used. Ashbed diabase: —a rock of a scoriaceous, amygdaloidal, tabular intrusion that has incorporated sandy material. Hunne diabase: —a type of quartz dolerite (diabase) containing hornblende, biotite and often chlorite in addition to plagioclase and a clinopyroxene (Hunnelberg, Sweden). Kinne ...
gabbros injectés de dykes de diabase, crqt, 1979; Ducrot et Lancelot, 1978) est responsable de plis d) une série volcanique et volcano-sédimentaire. droits, d'une schistosité de fracture et de ...
Structure: Vesicles and amygdales occur. Sometimes has segregations of coarser rock enriched in feldspar. Mineralogy: Phenocrysts comprise olivine (olivine diabase) and/or pyroxene or plagioclase. The groundmass comprises the same minerals with iron oxide, and sometimes with some quartz, hornblende or biotite. Field relations: Dykes and sills.
Diábase, diabase, diabásio, (do grego diábasis, 'travessia', e diabaínein, 'cruzar'), microgabro (IUGS) ou dolerito é uma rocha magmática hipabissal, de textura ofítica, constituída essencialmente por plagioclásios básicos, piroxênio, magnetita e ilmenita.. Diabase com face polida. Constitui-se de piroxênio e plagioclase cálcica.De cor negra, …
Updated on: November 28, 2022. Igneous Rocks. Home » Rocks » Igneous Rocks » Diabase Rock Type, Composition, Formation, Occurrence & Uses. Diabase is a dark-colored fine-grained, intrusive igneous rock. Diabase …
Download reference work entry PDF. The term diabase was originally applied by A. Brongniart in 1807 for rocks later recognized as diorite. Some authors use it to refer to …
CHAPTER 32 Diabase, Gabbro and Similar Dikes and Sills 32.1. INTRODUCTION In American usage, "diabase" is an intrusive rock composed of labradorite and pyroxene and characterized by ophitic texture (A.G.I. Glossary of Geology). ... Fria, Fatala, etc.; de Kun, 1965), diabase sills and dikes are consistently listed as one …
In the United States and Canada, the name "diabase" is used for a dark gray to black, fine-grained, intrusive igneous rock that has a composition similar to basalt and gabbro. The difference between basalt, diabase, …
Diabase (or dolerite) is a medium-grained igneous rock with basaltic composition. The term is also synonym of microgabbro. The name comes from the Greek diabasis, meaning 'crossing over', which is appropriate since this rock is texturally halfway between a gabbro and a basalt.Dolerite has a similar origin, from the Greek doleros, deceptive.. Diabase …
Source: Commons.wikimedia. Diabase rock, also known as dolerite, is an igneous rock that holds a wealth of geological significance and practical uses. Its …
Local Quarries. Diabase is a hard, brittle rock used as a base component for construction of roads and for building foundations. There are defined belts of this rock, also known as trap rock, south of Leesburg and near …
Sills are 365 to 400 m (1,197-1,312 ft) thick. Dikes range in thickness from 3 to 10 m (10-33 ft) and are many kilometers long. Diabase dikes (Late Proterozoic) (Ratcliffe, 1987; Puffer and others, 1991) - Medium- to dark greenish-gray, aphanitic to fine-grained dikes that are dense and hard.
dolerite. 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. Where olivine also occurs as an additional mineral, …
Abstract. Weathering extends to shallower depths on diabase than granite ridgetops despite similar climate and geomorphological regimes of despite similar climate and geomorphological regimes of denudation in the ia (USA) piedmont. Deeper weathering has been attributed to advective transport of solutes in granitic rock …
Emmons, 1886. CHAPTER 32 Diabase, Gabbro and Similar Dikes and Sills 32.1. INTRODUCTION In American usage, "diabase" is an intrusive rock composed of …
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Look up diabase in Wiktionary, the free dictionary.. Diabase (/ ˈ d aɪ. ə ˌ b eɪ s /), also called dolerite (/ ˈ d ɒ l. ə ˌ r aɪ t /) or microgabbro, [1] is a mafic, holocrystalline, 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 …
Compositionally and texturally zoned diabase dykes and sills occur in the outer zone of the Emeishan large igneous province (ELIP) in the southern Guizhou Province, Southwest China. Based on the detailed petrology, whole rock geochemistry, zircon U-Pb geochronology and Hf isotopes and clinopyroxene mineral compositions …
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Diabase is an intrusive igneous rock with the same mineral composition as basalt. It cools under basaltic volcanoes, like those at mid-ocean ridges. Diabase cools moderately quickly when magma moves up into fractures and weak zones below a volcano. There, it forms dikes (tabular igneous rock bodies that cut across pre-existing rock …
The geochemical composition of the Lac de Gras diabase is consistent with alkalic intraplate basalt magmatism. In contrast, MacKay dykes are MORB-like, with a relatively flat REE pattern (La/Yb cn =2) and the lowest trace-element enrichment. The Malley dykes also have a relatively flat REE profile
Abstract. The crystalline area of Georgia, comprising more than 17,000square miles, was studied for the occurrence of diabase. Fifty-seven new dikes were mapped and specimens from them examined under the microscope. No sill-like bodies were encountered and no flows or remnants of flows exist in the area. No definite age can be given to the ...
The meaning of DIABASE is diorite. diorite; an altered basalt; a fine-grained rock of the composition of gabbro but with an ophitic texture… See the full definition
The Nipissing Diabase is approximately the same age as the Ungava magmatic event (2219+ −1 Ma), and may be related to the Senneterre dyke swarm (2216+ /−8/4 Ma) ( Fig. 2.13 A; Ernst, 2014 ). The rock types are typically gabbroic, but the magmatic event has historically been named based on the less-common development of finer-grained diabase.
You can define dolerite or diabase as a medium-grained, dark-colored subvolcanic rock with a composition similar to basalt or gabbro. It is a basic (low in silica …
La carrière-atelier de Beulin à Saint-Germain-le-Guillaume (Mayenne) est située au coeur d'une zone où les filons de dolérite abondent. ... Ces deux roches ont été longtemps appelées diabase, terme largement tombé en désuétude. L'âge exact de cette dolérite pose des problèmes aux géologues ; elle est datée actuellement de la ...
Diabase (or dolerite) is a medium-grained igneous rock with basaltic composition. The term is also synonym of microgabbro. The name comes from the Greek diabasis, meaning …
Carrière de gabbro, Allemagne Carrière de diabase, Allemagne Présents dans le monde entier Importants gisements connus en Carélie, dans les Émirats, en Afrique du Sud, en Inde dans l'État indien d'Andhra Pradesh et au Groenland dans le complexe de Skaergaard Roche la plus commune dans la croûte terrestre océanique profonde
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This study presents the characteristics of diabase rocks and rock aggregates measured during the preliminary exploratory survey. Diabases are characterized as "high hardness", very compact rock having low porosity and water absorption, and rock aggregates show high resistance to fragmentation (LA15) making …
the diabase (dolerite)dikes of eastern North America and speculated in one way or another on their regional significance. King (1961, 1971) pointed out the wide-spread occurrence of Mesozoic dikes in the Appalachianregion and drew attention to their systematic pattern. De Boer (1967) carried out
Un dyke de diabase d'environ 140 km de longueur (le dyke Shelburne) coupe en direction nord-est en travers la partie sud-ouest de la Nouvelle-Ecosse. Le dyke a CtC rkcemment datC k 201 Ma et ...
