Dolerite


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Related to Dolerite: pegmatite

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.

References in periodicals archive ?
Many dykes and veins of leucocratic microgranite, aplite, quartz, rare pegmatites, dolerite and rhyolite are emplaced in the granite.
Sample Collection: Blocks of dolerite were collected from various locations of Kirana hills (Figure-2).
Based on industrial seismic data the size of the presumable area in which dolerite intrusions occur ranges from 30 to 60 km in east-west direction, and is about 100 km in north-south direction (Fig.
my earliest memory: a radiant moon silently rising above the rim of our backyard in its light I saw my slender shadow fall endlessly through a craggy, cold eternity- there where I stood in a landscape of dolerite by day a Namaqua woman looked after me her clicking speech echoed in my Afrikaans a magnet that must hold me here in the moon's trance the language that has me holding on tight as across Africa's cracked lip its fevered breath blows hard
And next moment we're swerving between massive dolerite columns and cliffs in jet- boat style, ensuring we hit neither.
During the summer, tens of thousands of birds, including more than 36,000 pairs of puffins, over 1,000 pairs of Arctic Turns, 1,900 breeding shags, and even a few Shelduck, Ringed Plovers, Barn Swallows and Rock Pipits visit the islands' igneous dolerite outcrops that once provided homes to saints like Aidan and Cuthbert.
However, some scientists who have studied the unique geology of the Karoo, with its widespread intrusion of dolerite dykes and sills, have expressed concern that there exists the possibility of contaminants reaching the groundwater system.
Thomas identified Carn Meini as the source of spotted dolerite bluestones, but a new analysis of the rocks' chemical makeup has fingered Carn Goedog as the true home of at least 55 percent of those used at Stonehenge, according to Planet Earth.
We soon pass a large mass of rock composed of dolerite with layers of sandstone and shale at its base and, after crossing a wooden footbridge, steps take us over a wall.
Drilling intersected broad zones of gold mineralisation associated with a wedge of felsic volcanics bounded by dolerite.