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Picrite basalt or
picrobasalt is a
variety of high-magnesium
olivine basalt that is very rich in the
mineral olivine. It is dark with yellow-green olivine...
- The
tholeiitic magma series (/ˌθoʊleɪˈɪtɪk/) is one of two main
magma series in
subalkaline igneous rocks, the
other being the calc-alkaline series. A...
- Ma,
placing them in the
Cretaceous period.
Their composition includes picrite pillows at the base,
followed by
tholeiitic lavas, then hyaloclastites...
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Examples of lava
compositions (wt%)
Component Nephelinite Tholeiitic picrite Tholeiitic basalt Andesite Rhyolite SiO2 39.7 46.4 53.8 60.0 73.2 TiO2 2...
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mantle rock. The
primitive melt may have had the
composition of
picrite basalt, but
picrite basalt is
uncommon in
flood basalt provinces. One possibility...
- melting, as much as 15% to 30%. High-magnesium magmas, such as
komatiite and
picrite, may also be the
products of a high
degree of
partial melting of mantle...
-
olivine and what is now
called teschenite as he
identified the
former as
picrite.
Until 1892 the name in use for the rock was tchesenit,
which is derived...
- of the
volcano are
greenish in color, due to
olivine sand
derived from
picrite basalt lavas. The
Grand Brûlé is
formed from
solidified lava
flows ac****ulated...
-
produce more
decay heat.
Lower temperature mantle melts such as
basalt and
picrite have
essentially replaced komatiites as an
eruptive lava on the Earth's...
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Hypabyssal type Quartz-porphyry Orthoclase-porphyry
Porphyrite Dolerite Picrite Lavas or
Effusive type Rhyolite,
Obsidian Trachyte Andesite Basalt Komatiite...
