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gabbro
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gabbro

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Olivine gabbro through a polarized microscope. Gabbro is a coarse-grained igneous rock.
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Gabbro through a polarized microscope. Gabbro is an igneous rock which forms in major plutonic intrusions.

Mafic (consisting primarily of dark-coloured crystals) igneous rock formed deep in the Earth's crust. It contains pyroxene and calcium-rich feldspar, and may contain small amounts of olivine and amphibole. Its coarse crystals of dull minerals give it a speckled appearance.

Gabbro is the plutonic version of basalt (that is, derived from magma that has solidified below the Earth's surface), and forms in large, slow-cooling intrusions.



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? Mentioned in ? References in periodicals archive
 
hosted by monotonous sequences of clastic rocks intruded by gabbroic to granitic plutons, and metamorphosed to at least the greenschist fades.
Great mining camps of Canada 1. The history and geology of the Keno ... by Cathro, R.J. / Geoscience Canada
The Gradaus-Cumaru project area consists of Archean-age greenstone sequence and granitic to gabbroic intrusives, all of which have been intruded by slightly younger granitic bodies, the more important of which is the Cumaru granodiorite stock.
Aura Gold Inc.'Formerly Canadian Baldwin Resources Limited': ... by Business Wire
The continental environment features the massive intrusions of the midcontinental rift system, such as the Duluth gabbroic complex and associated intrusions, the Nipissing diabase, the huge Muskox Coppermine Mackenzie intrusive event and the Franklin intrusives in the Arctic.
Magmatic Platinum Group Element Environments in Canada: Present and ... by Theyer, Peter / Geoscience Canada
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