volcanics

volcanics

[väl′kan·iks]
(petrology)
Igneous rocks that solidified after reaching or nearing the earth's surface.
References in periodicals archive ?
Deosai volcanics and the meta-volcanics of the Burji-La Formation, mainly exposed in the study area are the focus of this study.
The Arthurville tenement lies within Molong Volcanics of the Lachlan Fold Belt, host to many important porphyry copper-gold deposits such as Copper Hill and Northparkes.
The chemistry of the volcanic rocks from Mount Etna and the nearby Iblean volcanics in Sicily and in the surrounding seas indicate that they are intraplate volcanics.
The EPM covers several red-soil plateaux underlain by weathered Tertiary volcanics [probably tuffs] with high feldspar content and no quartz.
Mineralisation at Alejandra is hosted within strongly-brecciated volcanics containing quartz veins, silicified zones, and both tectonic and hydrothermal breccias.
Supposedly, airborne volcanics dissipate too quickly to start an ice age.
Known as the Ontario portion of the Blake River group of volcanics, this section of country still needs a lot of exploration, according to McGuinty.
The rocks exposed in the study area are highly deformed and include basalt-andesite sheet dominant volcanics and un-deformed volcanic rocks of Ishkoman Volcanic Center / Teru Volcanic Formation of Ghizar Formation and diorites of the Kohistan batholith.
Epithermal gold-silver and mesothermal gold targets within veins, stockwork and breccias hosted by the Jurassic aged Misahualli andesitic volcanics (13 targets);
The porphyritic volcanics are hypersthenes normative with high plagioclase (Ab+An) normative composition whereas the non-porphyritic volcanics have greater amount of normative pyroxene (Hy+Di) relative to plagioclase (Ab+An).
Anomaly 4 occurs along on the partially covered structural contact between Siegal Volcanics and the Westmoreland Conglomerate.
The geology of the area is mainly comprised of the Chalt volcanics and diorites belonging to Kohistan island arc (KIA).