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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
 
111 Ga Griffin gabbros (formerly Hurwitz gabbros) [#4e] are presumably linked to breakup along the Trans-Hudson margin (Aspler el al.
Igneous rock associations in Canada 3. Large Igneous Provinces (LIPs) ... by Buchan, K.L. / Geoscience Canada
By analyzing the transitions between different minerals in the gabbros and the changes in the crystalline structure, geologists will be able to reconstruct the evolution of the lower crust, says Henry J.
Getting to the bottom of the crust by Science News
The total length of the strike now covering the favourable contact of the intrusive gabbros of the Coldwell Complex and the older volcanic and sedimentary rocks now exceeds 12 km.
Marathon PGM Corporation Adds to Land Holdings by Business Wire
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