Ultramafic

Some articles on ultramafic:

Emily Ann And Maggie Hays Nickel Mines - Maggie Hays Mine Geology
... The Maggie Hays orebody sits upon the upper surface of an overturned sequence of komatiitic ultramafic cumulates dipping west at between 65 and 75 degrees ... The ultramafic body is in the form of a 'keel', with a southward plunging folded surface pinching out the northern end of the resource, where it enters a heterogeneously sheared structure ... The ultramafic sequence is folded at its down-dip termination, where it enters a shear, with remobilised sulfides forming a discontinuous remobilised stringer ore zone of low grade ...
Serpentine Soil
... A serpentine soil is derived from ultramafic rocks, in particular serpentinite, a rock formed by the hydration and metamorphic transformation of ultramafic rock from the Earth's mantle ... The soils derived from ultramafic bedrock give rise to unusual and sparse associations of edaphic (and often endemic) plants that are tolerant of extreme soil conditions, including low calcium-to-magnesium ... soils high concentrations of the heavy metals (more common in ultramafic rocks) ...
Layered Intrusion
... Although most are ultramafic to mafic in composition, the Ilimaussaq complex of Greenland is an alkalic intrusion ... Ideally the stratigraphic sequence of an ultramafic-mafic intrusive complex consists of ultramafic peridotites and pyroxenites with associated chromitite layers toward ...
Cumulate Rock - Geochemistry - Residual Melt Chemistry
... Investigating magma conditions of large layered ultramafic intrusions is more fraught with problems ... problem is the fact that in large ultramafic intrusions, assimilation of wall rocks tends to alter the chemistry of the melt as time progresses, so ... Secondly, large ultramafic intrusions are rarely sealed systems and may be subject to regular injections of fresh, primitive magma, or to loss of volume due to further upward migration of the ...
Great Dyke - Geology
... It is a group of layered ultramafic intrusions that extend across Zimbabwe with a strike of about N10°E ... The Great Dyke is unusual in that most ultramafic layered intrusions display near horizontal sill or sheet forms ... The well-layered lower units of ultramafic rocks comprising the Great Dyke are locally overlain by erosional remnants of gabbroic rock ...