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dolerite
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dolerite

Igneous rock formed below the Earth's surface, a form of basalt, containing relatively little silica (mafic in composition).

Dolerite is a medium-grained (hypabyssal) basalt and forms in shallow intrusions, such as dykes, which cut across the rock strata, and sills, which push between beds of sedimentary rock. When exposed at the surface, dolerite weathers into spherical lumps.

In the UK the term ‘diabase’ is used as an alternative to dolerite, often implying an altered dolerite, as distinct from fresh rock.



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The mineralisation occurs along a plunge distance of some 250 metres to an approximate depth of 150 metres and it occurs irregularly on the crest and flanks of the arched doleritic intrusion.
Continental Precious Minerals Inc.: Results of NI 43-101 Geological ... by Business Wire
: the Du River Prospect, comprising mesothermal gold veins in gabbros; the Kui copper anomaly, comprising copper veins in doleritic sea-floor volcanics; and the Simboma gold anomaly, comprising epithermal gold veins in andesitic sea-floor volcanics.
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Bowutu Mountains license contains three main areas of interest; the Du River Prospect comprising mesothermal quartz arsenopyrite-gold veins in gabbros, the Kui copper anomaly with quartz-chalcopyrite veining in doleritic sea-floor volcanics and the Simpoma gold anomaly, comprising epithermal gold veins accompanying argillic alteration in andesitic sea-floor volcanics.
Indo Pacific Resources Ltd. Reports Positive Results from Recent PNG ... by Business Wire
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