diabase


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Related to diabase: anorthosite, dolerite, dunite, pyroxenite

diabase:

see basaltbasalt
, fine-grained rock of volcanic origin, dark gray, dark green, brown, reddish, or black in color. Basalt is an igneous rock, i.e., one that has congealed from a molten state.
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diabase

[′dī·ə‚bās]
(petrology)
An intrusive rock consisting principally of labradorite and pyroxene.

diabase

Rock having the same composition as basalt, but with larger crystals which are just visible to the unaided eye; also called traprock.
References in periodicals archive ?
The chondrite-normalized REE distribution pattern of the diabase samples (as precursor of the bauxite horizon) displays a remarkable M-shaped (convex) tetrad effect in the third and fourth tetrads (Figure 10a).
UEC said its acquisition strategy focusses on low cost, high value projects, and UEC gains a foothold in the Athabasca Basin with the Diabase project.
to determine properties of the steel manufacturing byproduct--Martin steel slag (MSS), as an aggregate, and to compare them with properties of conventional granite, diabase and dolomite aggregates;
Specific standards used for the best fit regression calibration for elements of interest include G-2 (basalt), AGV-1 (andesite), GSP-1, SY-2 (syenite), BHVO-1 (hawaiite), STM-1 (syenite), QLO-1 (quartz latite), RGM 1 (obsidian), W-2 (diabase), BIR-1 (basalt), SDC-1 (mica schist), TLM-1 (tonalite), SCO-1 (shale), GXR-1 (jasperoid), all U.S.
Associated with the granitoids, there are late intrusions of syenite, aplite, diorite and diabase. The syenite represents a marginal event of the batholith, of which it constitutes scarcely a 5% of the area; it grades from medium grain size to pegmatitic.
The samples in Table are as follows: Light Expanded Clay Aggregate consisting of the lightweight particles of burn clay (LECA); coarse gravel used for sanding roads (Gravel); black diabase (Diabase); yellow quartz (Quartz); black gabbro (Gabbro); crushed redbrick (C Brick); sandblasting sand with grain size 0.1-0.6 mm (Sand01) and grain size with 0.5-1.2 mm (Sand05); bunker sand from golf course (Bunker).
It was in the rainy season and the barren ground was covered with anglos, a festive carpet of yellow flowers that softened the hard diabase, lovingly.
The hanging wall comprises ophiolitic rocks, consisting primarily of gabbro, diabase and basalt, and subordinate ultramafic rocks and chert.
Reportedly, this field, home to "the largest diabase (dolerite) deposit in North America," teems with "audio tourists" intent on investigating the mineral's peculiar resonance by wandering around with hammers and striking the rocks to produce a variety of bell-like tones.