Mafic in a sentence

TXT23-17 was collared in hanging wall mafic intrusive and followed a succession of komatiite and mafic volcanics before intersecting mineralized peridotite at 81 metres.

Water and other volatiles can more easily and gradually escape from mafic lava, so eruptions of volcanoes made of mafic lavas are less explosively violent than felsic-lava eruptions.

Early Proterozoic rift related mafic and ultramafic intrusive rocks are prospective for PGE-Ni-Cu deposits in the Lake Nipigon region as exemplified by the many occurrences or deposits discovered ie.

It is interpreted that the magnetic and geochemical signatures indicate mafic/ultramafic intrusive rocks potentially carrying nickel-copper-PGE mineralisation, and that the EM anomalies indicate zones where more conductive sulphides might be present.

Late-stage aplite, quartz feldspar porphyry and mafic dikes also occur with the mineralized zones and in outcrop.

Several small lamproitic diatremes may also be coeval with mafic volcanism.

The DGB is characterised by a deeply weathered, metamorphosed succession of Archaean mafic, ultramafic, and felsic volcanic rocks with associated volcanogenic sedimentary rocks and thin units of banded chert and banded iron formation.

Drilling intersected K-feldspar pegmatitic dykes cutting predominantly through the granite but are also present, albeit less prevalently, in the mafic metavolcanic host rock adjacent to the batholith.

Pyrrhotite mineralization was confirmed with a Niton XL5 Plus portable XRF, and is present in most mafic-ultramafic rock packages.

The Crown Prince deposit is hosted within quartz-carbonate veins within altered and sheared mafic units.

Mineralization at the ICO is characterized as syngenetic, stratiform/tabular exhalative deposits within, or closely associated with, the mafic sequences of the Apple Creek Formation.

Chemically, mafic rocks are on the other side of the rock spectrum from the felsic rocks.

Felsic, intermediate and mafic igneous rocks Those rocks that contain the most silica, and on crystallizing yield free quartz, form a group generally designated the "felsic" rocks.

In basic rocks (containing 20% of silica or less) it is rare for them to contain as much silicon, these are referred to as mafic rocks.

In terms of chemistry, felsic minerals and rocks are at the other end of the elemental spectrum from the mafic minerals and rocks.

Mantle plume hypotheses may rely on identifying mafic and ultramafic intrusions and coeval basalt volcanism.

M-type or mantle derived granite was later proposed to cover those granites that were clearly sourced from crystallized mafic magmas, generally sourced from the mantle.

Rare feldspathoid -rich mafic rocks, akin to alkali basalts, may have Na 2 O + K 2 O contents of 12% or more.

These results point to the fact that the surface is largely composed of basalts and other mafic rocks, which would have erupted as low viscosity lava flows and hence lead to the low gradients on the surface of the planet.

They are (or were) the hottest lavas, and probably more fluid than common mafic lavas.