myrmekite


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myrmekite

[′mər·mə‚kīt]
(petrology)
Intergrowth of plagioclase feldspar and vermicular quartz in an igneous rock.
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During myrmekite formation aligned rod like microcrystalline quartz with rounded boundaries precipitates because of K-feldspar breakdown to more calcium rich plagioclase (anorthite) at high temperature (Becke 1908; Collins 1996; Rong 2002).
Myrmekite frequently occurred in felsic to intermediate igneous rocks ortho/para granitic gneisses and quartzo-feldspathic schists.
Myrmekite that commonly occurs in the granite and granitic gneisses rimmed K-feldspar phenocrysts in the sample (Fig.
Myrmekite at the boundary of K-feldspar resulted into fine grained quartz blebs and drops.
The contact between K-feldspars grains is occupied by cryptocrystalline silica muscovite and myrmekite (Fig.
Origin of myrmekite and metasomatic granite: Myrmekite electronic Internet publication no.
During its meeting, which was headed by the permanent representative of Lithuania to the UN ,Raymond Myrmekite ,the Committee exchanged views on these proposals and is considering them.
Kellys Mountain Gneiss DM91-01 Bt-PI gneiss m.g (0.1-0.5 mm), decussate, PI(An37)-Qz (An37)-Bt-Mcl gneiss; some myrmekite; mineralogical banding but no obvious foliation (alignment) of Bt.
Fine globules and worm-like patches of quartz also occur in association with and within perthite grains forming myrmekite or granophyric texture.
Polonium halos have only been found in granite that also contain myrmekite and not in magmatic granite without myrmekite.
K-feldspar is characterized by the occurrence of myrmekite. Biotite is usually significantly pleochroic, light yellow-brown along X, brown to dark brown along Y and Z.
Two-feldspar thermometry on asymmetric strain induced myrmekite provides a minimum temperature estimate (370-435oC) for top-down-to-the-west sense of shear.