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Related to Pyroclastics: Flood basalt


Composed chiefly of rock fragments or particles of volcanic origin, such as pumice, obsidian, or volcanic ash.


(Geological Science) (of rocks) formed from the solid fragments ejected during a volcanic eruption


(ˌpaɪ rəˈklæs tɪk)

composed chiefly of volcanic rock fragments, as agglomerate or tuff.


adj (Geol) rockspyroklastisch; pyroclastic flowpyroklastischer Strom
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Lunar pyroclastics seem to be universally water-rich, which suggests the same may be true of the mantle.
The majority of the total volume of erupted products is pyroclastics [particles and rocks ejected from a volcano during eruption], contrasting with most recent eruptions of Etna which produced mainly lava effusion [flowing over the ground]," volcanologist Domenico Patane (http://news.
The term "Pre-Cosiguina" has been applied for lavas and associated pyroclastics that formed the original volcano, now preserved in the form of the relict of somma Cresta Montosa (Williams, 1952), better seen in the crater wall sections.
The effects of the 536 volcano far exceed those of the eruption in 1815 of Tambora (Indonesia), a volcano that discharged 10 times the amount of pyroclastics (fragmental volcanic material blown into the atmosphere) as the Krakatoa eruption in Indonesia in 1883 (SN: 8/27/83, p.
1) Zone and is comprised of three sub-zones termed the Telluride, Upper and Lower Zones, and consists of sheared and altered felsic to intermediate pyroclastics.
The colors of pyroclastics are too subtle to capture by imaging, but amateur astronomers have developed creative ways to record another kind of delicate lunar color.
Radiocarbon dating of a carbonized branch of small tree recovered from the Congo pyroclastics yielded a date of 5140 [+ or -] 110 [sup.
and intersected an inter-fingering sequence of clay altered tuffs and reworked pyroclastics.
Larger and more explosive eruptions fling the pyroclastics farther away, constructing huge, low-rimmed craters such as the Yellowstone caldera in Wyoming.
It reached a depth of 330 ft and was still in the pyroclastics.
On the false-colored Clementine image reproduced here, these pyroclastics are shown as deep red.
Potassic altered, andesitic pyroclastics, with localized overprinting of intermediate argillic alteration and associated weak to moderate quartz-limonite veinlets were intersected from 159 metres to 450 metres.