hyaloclastite


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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.
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Petrographically the section was discriminated between accretionary lapilli tuffs, fine hyaloclastite tuffs and mudstones cycles.
2013: Three-dimensional lithofacies in hyaloclastite deposits.
Two lenticular bodies of porphyritic and amygdaloidal basalt are found intercalated within the Hyaloclastite mudstone units of the Bagh complex (Siddiqui et al.
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.
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.
1993) consists of volcanic flows, hyaloclastite and volcaniclastic sandstone and siltstone.
The rocks recovered include variably palagonitized glassy lavas (pillows, clinker, sheet flows) coated with manganese crusts, and hyaloclastites.
At present, the collection contains more than 500 samples spanning the basaltic to rhyolitic composition including lavas, hyaloclastites, intrusions, and a few sedimentary rocks of volcanic origin.
Lower basalts are sills, upper basalts are predominantly pillow lavas and hyaloclastites, (vitrified, basaltic fragments and dust).