volcaniclastic rock

volcaniclastic rock

[väl¦kan·ə¦klas·tik ′räk]
(petrology)
Clastic rock containing volcanic material in any proportion.
References in periodicals archive ?
Significant mineralization, up to 20% stringers, disseminated and semi-massive to massive sulphides, was intercepted in 7 of the 8 drill holes within the first 20 metres from surface which was contained in altered volcaniclastic rock. The mineralized intercepts range from .5 metres to 8.7 metres which are within broader altered zones consistent with the VMS deposit formation process.
All intercepts were present within zones of pyrite and quartz veins in the volcaniclastic rock. Ground geophysics (induced polarization, IP) suggests the SE-trending structure terminates south of OURC029, and is offset either 90 m to the northeast, or 240 m to the southwest.
The British Columbia Geological Survey (BCGS; McKeown et al., 2007) mapped a conformable sequence of layered Paleozoic felsic to mafic sub-aqueous volcaniclastic rocks and documented an extensive alteration zone, with the King Solomon Trend at its core for at least 2.1 kilometers.
The ophiolitic and volcaniclastic rocks in the Wazhdad area and its vicinity show soapstone mineralizations.
The volcaniclastic rocks in the surrounding area are Quaternary lahar and debris flow deposits, as well as alluvial and colluvial deposits composed by rounded to angular fragments.
The pyroclastic rocks are volcaniclastic rocks formed by accumulation of pyroclasts (fragments) during Mesozoic explosive eruption by Yanshan movement.
The rocks along the Tarom-Hashtjin axis, which are considered equivalent to the Karaj Formation, are different from those in central Alborz in terms of the lithology and chemical composition because the lava flows do not consist only of volcaniclastic rocks along this axis and their compositions are more basic.
Permo-Triassic and Cenozoic sedimentary, volcanic and volcaniclastic rocks unconformably overlie the Palaeozoic basement (Fig.
Muehlenbachs (2003), "Tuff Life: Bioalteration in volcaniclastic Rocks from the Ontong Java Plateau," Geochem.
The Corralitos area is underlain by hydrothermally-altered, coarse-grained granodioritic to monzonitic intrusions and adjacent volcanic and volcaniclastic rocks of probable Cretaceous age.
The Property is principally underlain by Tertiary volcaniclastic rocks of the Callipuy Formation.
This resource consists of two mineralised bodies, the Main Zone and Tom's Zone in Silurian volcaniclastic rocks of the Anson Formation.