hyaloclastite


Also found in: Wikipedia.

hyaloclastite

[¦hī·ə·lō′kla‚stīt]
(geology)
A tufflike deposit formed by the flowing of basalt under water and ice and its consequent fragmentation. Also known as aquagene tuff.
Mentioned in ?
References in periodicals archive ?
Petrographically the section was discriminated between accretionary lapilli tuffs, fine hyaloclastite tuffs and mudstones cycles.
Two lenticular bodies of porphyritic and amygdaloidal basalt are found intercalated within the Hyaloclastite mudstone units of the Bagh complex (Siddiqui et al., 1996).
has been reported from mafic hyaloclastite beds of the Sawyer Brook Member about 200 m stratigraphically above the sampled Campbell Point tuff horizon (Fyffe et al.
El-Anbaawy, "Chemical changes and authigenic mineral formation during palagonitization of a basanite hyaloclastite, Gran Canaria, Canary Islands," Neues Jahrbuch fur Mineralogie-Abhandlungen, vol.
The volcanic rocks from basalt-chert unit (Bbc) and hyaloclastite-mudstone unit (Bhm) are comprised of pillowed and bedded basalt, hyaloclastite and reworked sediments.
On Campobello Island it consists of locally pyritiferous, black to grey siltstone, lithic sandstone, shale and argillite intercalated with thick (up to several tens of metres) units that contain vesicular flows, agglomerate and/or well-developed hyaloclastite sequences.
These include abundant dark green, fine-grained, amygdaloidal, porphyritic basalt flows, and lesser pillow lava, basalt breccia and bedded hyaloclastite. These facies have all been recognized in the Oak Mountain type-area by Venugopal (1979).
(1993) consists of volcanic flows, hyaloclastite and volcaniclastic sandstone and siltstone.
Kulik, "Differential alteration of basaltic lava flows and hyaloclastites in Icelandic hydrothermal systems," Geothermal Energy, vol.
The rocks recovered include variably palagonitized glassy lavas (pillows, clinker, sheet flows) coated with manganese crusts, and hyaloclastites. The Endeavour Seamount lava is highly plagioclasephyric, but all others are aphyric to sparsely phyric (plagioclase +/- olivine, rare clinopyroxene).
The submarine volcanic rocks include lava flows, broken pillow breccias, submarine breccias, close-packed pillow lavas and hyaloclastites. The textures and the original mineralogy deduced from the hydrothermal phases, suggest basaltic and basaltic andesite compositions.