quartz syenite

quartz syenite

[′kwȯrts ′sī·ə‚nīt]
(petrology)
A group of plutonic rocks having the characteristics of syenite but with a greater amount of quartz (5-20%).
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The icositetrahedra crystal with average size of 10 [micro]m was identified as analcime in Figure 4(b), which is similar to the morphology of analcime obtained by using clinker [20], rice husk ash [15], and quartz syenite [16] as raw materials.
Zhang, "Synthesis and characterization of analcime using quartz syenite powder by alkali-hydrothermal treatment," Microporous and Mesoporous Materials, vol.
The focus of the present study is to give an account of petrographic characteristics and physicomechanical properties of representative samples of alkali granite, quartz syenite, and nepheline syenite from the AGC.
Two of the four bulk samples collected for determining physicomechanical properties represent alkali granites from Ambela proper, while the remaining two include one each of quartz syenite from Babaji Kandao and nepheline syenite from Koga area (Figure 1).
Megaporphyritic Alkali Quartz Syenite. Investigation of three thin sections suggests that this rock predominantly consists of perthitic alkali feldspar (64-66 modal %), which occurs in two distinct grain-size populations, namely, coarse-grained and medium to fine grained.
The total abundance of mafic minerals and feldspar to quartz ratio in the porphyritic alkali quartz syenite is distinctly higher but micas much less abundant than in alkali granites.
The UCS and UTS of the petrographically investigated samples of alkali granites, alkali quartz syenite, and nepheline syenite were determined in the laboratory.
Employing the method and calculations described elsewhere [8], the values of water absorption for the studied samples of alkali granites, alkali quartz syenite, and nepheline syenite were determined (Table 2).
The specific gravity of the mega-porphyritic alkali granite, micro-porphyritic alkali granite, alkali quartz syenite and nepheline syenite samples was determined in the laboratory using the equipment and formula mentioned elsewhere [8].
2003), an age of 469 [+ or -] 0.5 Ma was obtained recently from quartz syenite of the West Barneys River plutonic suite in the Antigonish Highlands (Escarraga 2010; Escarraga et al.
(1980), show that the host rock is a quartz syenite close to the field of quartz monzonite.
As mentioned above, the host rocks to the Zapot pegmatite are chemically quartz syenite according to the classification of De la Roche et al.