Dolerite

(redirected from doleritic)
Also found in: Dictionary, Wikipedia.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Dolerite

 

a magmatic rock, effusive or intrusive (near the surface), with a basalt composition. It is characterized by a holocrystalline, coarse-grained doleritic (or ophitic) structure; an aggregate of pyroxene (frequently with olivine) in the form of isometric grains fills out the angular sections between prisms of plagioclase. Dolerite is formed as a result of the slow cooling of molten basalt in the central parts of lava flows or in veins. Dolerite is used in construction as dimension stone and to make crushed stone.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The number of straight crystal faces was determined for kaolinite crystals in quartz--and clay-rich regolith and also for granitic and doleritic saprolite from Jarrahdale and compared with the API kaolinite No.
Preserved granitic fabric (Zg) and doleritic fabric (Zd) mine floor materials represent the granitic and doleritic saprolite and saprock of Anand and Paine (2002) that occur below the pedoplasmation front.
3), and consist principally of fine-grained plagioclase laths and biotite with varying quantities of generally rounded and resorbed xenocrysts of K-feldspar and quartz; textures include doleritic, ophitic, and microgranular (Fig.
Their texture is coarse- to medium-grained, porphyritic to ophitic and subophitic, with a doleritic matrix.
These are equigranular rocks, mainly with doleritic textures but in some cases with microlithic or fluidal microlithic textures.
The Prospect Intrusion is a Jurassic doleritic laccolith emplaced concordantly between Triassic deltaic Hawkesbury Sandstone and the overlying lacustrine Ashfield Shale member of the Wiannamatta Group, also of Triassic age.
Petrological and geochemical data is consistent with the basaltic, doleritic and gabbroic intrusions comprising alkalic series signatures, characteristic of heterogeneous asthenospheric melting associated with ocean island basalt (OIB) magmatism.
The two granitoids contain local bodies of the basement consisting of fine-grained doleritic to medium-grained dioritic rocks.
Within these granitoids occur local bodies of the basement comprising dark fine-grained doleritic to medium-grained (quartz) dioritic rocks.
It shows a porphyritic to doleritic microstructure with subidiomorphic large crystals of olivine (up to 1.6 mm).