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Topic: Pyroclastics

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	Pyroclastics - Wikipedia, the free encyclopedia
		Pyroclastics (literally "Fire Rock") are debris thrown from volcanoes during an eruption.
		A Pyroclastics eruption entails spitting or "fountaining" lava, where the lava will be thrown into the air along with ash, Pyroclastics materials, and other volcanic byproducts.
		Ash is also considered to be a "Pyroclastics" because it is a fine dust made up of volcanic rock.
	en.wikipedia.org /wiki/Pyroclastics (152 words)

	vhdefined
		Pyroclastic flows are extremely dangerous to anything living in its path and devastate the area that it flows over.
		Pyroclastics are the blocks, bombs, lapilli, and ash that are erupted from a volcano and spread along the ground.
		It is pretty obvious that the size of the pyroclast determines the distance that it is thrown from its source; however, wind plays a key role in the dispersion of the finer lapilli and ash.
	people.colgate.edu /ajarolimek/volcanic_hazards_defined.htm (558 words)

	I don't understand what pyroclastics are. (Site not responding. Last check: 2007-10-01)
		Pyroclastic refers to any volcanic rock that was hurled through the air by volcanic activity.
		A pyroclastic eruption is one in which the great majority of activity involves fountaining or explosions.
		A pyroclastic deposit is the resulting layer or pile of material that has fallen to the ground by one or many pyroclastic eruptions.
	volcano.und.nodak.edu /vwdocs/frequent_questions/grp9/question682.html (232 words)

	Pyroclastic Deposits
		Pyroclastic rocks are the products of volcanic explosions; that is, they are fragmental pieces of rock, whether they be minerals, crystals or glass, ejected from the vent.
		Pyroclastics form by the expansion of gas contained in the parent magma.
		Pyroclastic flows have been classified into dense, intermediate, and vesicular flows; and ash flow to vesicular types.
	www.geologynet.com /pyro.htm (2158 words)

	VOLCANO
		Pyroclastics are pieces of lava thrown out by a volcano.
		Pyroclastics consist of ash (small pieces of lava - 2mm) or cinders (2-64mm).
		Ninety percent of the material expelled from this volcano is lava not pyroclastics.
	www.internetpuppets.org /tictocvolcano.html (602 words)

	Description of Kamchatka volcanoes
		The adjacent eroded cone of Kozelsky is extinct.
		A tall symmetrical stratovolcano of andesite 3456 m high; it is built of welded and unwelded pyroclastics, with subordinate lavas, some of which are basaltic andesites.
		A small eruption in 1956 produced pyroclastic flows from the summit crater and a radial fissure; since then activity has been limited to fumaroles, but periodic increases in seismicity (including one in late 1997) indicate that future eruptions may be expected.
	www.travelkamchatka.com /kam_volc.htm (1294 words)

	extrusive rock - Hutchinson encyclopedia article about extrusive rock (Site not responding. Last check: 2007-10-01)
		Explosive volcanoes that deposit pyroclastics generally occur where one tectonic plate descends beneath another.
		Magmas that give rise to pyroclastic extrusive rocks are explosive because they are viscous.
		The island of Montserrat, West Indies, is an example of an explosive volcano that spews pyroclastics of andesite composition.
	encyclopedia.farlex.com /extrusive+rock (363 words)

	Salina volcanic island, Italy
		It initially produced lava flows but then powerful phreatomagmatic explosions generated pyroclastic surges and pyroclastic flows that covered all of the then-existing island, surmounting even the topographic barrier of Fossa delle Felci, which at that time was probably about as high as today.
		Subsequently the explosion crater was filled by a lake, which was gradually filled by remobilized pyroclastics, before the western half of the crater collapsed into the sea, probably along a tectonic structure.
		Center photograph shows massive pyroclastic flow deposits with peculiar erosive "chimneys", which may mark the site of post-emplacement fumarolic pipes where the deposits were cemented and thus are more resistent to erosion.
	boris.vulcanoetna.com /SALINA.html (2224 words)

	Pyroclastics
		As a general rule, a pyroclastic flow that forms from the collapse of a lava dome is called a(n)__________, whereas one that forms from the collapse of an eruption column is called a(n) ___________.
		The following term is used to describe an accumulation of relatively dense pyroclastic material deposited by a nuee ardente.
		The following term is used to describe an accumulation of relatively low-density pyroclastic material deposited by a pumice flow.
	www.geology.sdsu.edu /how_volcanoes_work/Tsterpr/TSTPYRO/TSTPYRO.HTM (241 words)

	Vulcano Etna, Sicilia, Italia
		While such a morphology can be due to the preferential accumulation of ejected pyroclastics on the leeward side - which will occur primarily during a relatively short-lived eruption that occurs during strong wind - most of the horseshoe-shaped cones owe their morphology to the outflow of lava from their vents on the downslope side.
		Montagnola, the peak forming the skyline, is a large pyroclastic cone formed during the summer 1763 eruption; its lava flows formed a peculiar ridge visible in the upperr left of the photo.
		The central portion of the crater was gradually filled with pyroclastics and lava flows, which formed a flat terrace.
	www.vulcanoetna.it /it_morfologia_crateri.php (4407 words)

	PRESS RELEASE (Site not responding. Last check: 2007-10-01)
		This exposure is considered significant as coarse felsic pyroclastics are often closely associated with VMS deposits and are usually in close proximity to sulphide deposition.
		Previously it was unclear as to the significance of these pyroclastic float boulders until this unit was discovered by stripping.
		This may suggest that a very large piece of mineralization hosted within felsic pyroclastic rocks was glacially plucked from the north facing felsic face and deposited over the known 2.0 kilometre dispersal train as bits and pieces.
	www.kasnergroupco.com /RJK_Exploration/Press_Releases/001107.htm (775 words)

	MT. PINATUBO - Glossary of Terms
		PYROCLASTIC - an adjective used to describe rock materials formed by fragmentation as a result of volcanic action.
		PYROCLASTIC FLOW (PF) - a turbulent flowing mass of ejected fragmental volcanic materials mixed with hot gases and moving downslope at high speed (about 60 kph or more).
		PF may result from the collapse of tall eruption columns or from spillover of ejected materials from erupting vents.
	www.park.org /Philippines/pinatubo/page7.html (677 words)

	New Page 1
		The volcanics on Mt. Washburn are calc-alkaline and bimodal with basaltic andesite and basalt predominating.
		The suggestion is that this represents a lava flow that flowed into a stream flanking the volcano, causing boiling, lava fragmentation, and mixing of some of the lava and unconsolidated sediment.
		The pyroclastics on the top left of this image are at a crosscutting relationship to the pyroclastics and lavas in the center and right.
	www.union.edu /PUBLIC/GEODEPT/hollocher/teaching_petrology/yellowstone_washburn.htm (1244 words)

	Geoscience - The Earth - Australian Landforms - The Warrumbungles
		Large volumes of trachytic pyroclastics were erupted (now tuff and breccia) as a blanket over the surrounding countryside, together with formation of lava domes and short, thick trachyte flows.
		Over time, the erupted magma continued to be less viscous, and trachyte eruptions were replaced by basaltic flows (hawaiite and mugearite) which became thinner and longer, until all activity ceased around 13 million years ago.
		One famous feature is the Breadknife, a dyke which forms a narrow trachyte wall intruding pyroclastics and rising steeply into the air.
	www.amonline.net.au /geoscience/earth/warrumbungles.htm (345 words)

	Au Niger
		The dominant lithologies are flows and pyroclastics of basaltic, basaltic-andesitic, and andesitic composition.
		Styles of mineralization are diverse, including quartz-sulfide veins and stockworks in highly altered felsic alkaline intrusions, mineralogically simple quartz veins in altered pyroclastics, quartz-sulfide stockworks in altered pyroclastics, quartz-sulfide veins in contact metamorphic zones, and mineralized shear zones in flows and pyroclastics.
		Strong foliations are common in many of the pyroclastics and much weaker to non-existent in the flows (photos 11 and 12).
	www.stratamodel.com /Niger_rpt.htm (4301 words)

	Volcanic and Geologic Terms Glossary (Site not responding. Last check: 2007-10-01)
		The mass of pyroclastics is normally of very high temperature and moves rapidly down the slopes, or even along a level surface.
		Most of the May 18 deposits in the upper valley of the North Fork Toutle River and in the vicinity of Spirit Lake are from the debris avalanche.
		Somma: A circular or cresent-shaped ridge that is steep on its inner side and represents the rim on an ancient volcanic crater or caldera.
	volcano.und.edu /vwdocs/msh/llc/is/vgt.html (1838 words)

	Volcanic Products: Pyroclastics (Site not responding. Last check: 2007-10-01)
		Pyroclastic eruptions associated with Santiaguito are generally minor in scale; associated with vertical ash eruptions and dome or lava flow collapses.
		Most of the pyroclasts were formed by vesiculation and disintegration of highly viscous magma near vent areas.
		However, as the region is characterized by high rainfall, it is possible that there may be some magma/water interaction, which results in phreatomagmatic eruptions.
	www.geo.mtu.edu /volcanoes/santamaria/pyro.html (97 words)

	BIRDSONGS OF THE MESOZOIC Pyroclastics reviews and MP3
		They are a very complex band, but at the same time possess an up front sense of humour; noting their quirky and pretentious rendition of “The Simpsons” theme song.
		Pyroclastics is my first Birdsongs of the Mesozoic’s album and to say the least it is quite a let down.
		With Pyroclastics the band strives to mature their sound; only to struggle with the fusion between their old and new styles.
	www.progarchives.com /Progressive_rock_discography_CD.asp?cd_id=4640 (1155 words)

	Hazard Slides Thumbnails
		Ash flows (pyroclastic flows) result from expansion of gas bubbles at the vent, which fragment the lava.
		Diamond Head is a large one measuring nearly 2.5 kilometers across at the base with a crater a kilometer across from rim to rim and averaging about 120 meters deep.
		With a decrease in the explosiveness of eruption, or an increase in the fluidity of the magma, or both, cinder cones grade into spatter cones.
	www.ngdc.noaa.gov /seg/hazard/slideset/29/29_thumbs.shtml (1859 words)

	Volcanic and Geologic Terms (Site not responding. Last check: 2007-10-01)
		Ash flow: A turbulent mixture of gas and rock fragments, most of which are ash-sized particles, ejected violently from a crater or fissure.
		Pyroclastic: Pertaining to fragmented (clastic) rock material formed by a volcanic explosion or ejection from a volcanic vent.
		Pyroclastic flow: Lateral flowage of a turbulent mixture of hot gases and unsorted pyroclastic material (volcanic fragments, crystals, ash, pumice, and glass shards) that can move at high speed (50 to 100 miles an hour.) The term also can refer to the deposit so formed.
	www.washington.edu /uwired/outreach/teched/projects/science/seismic/glossary.html (3623 words)

	LATE TRIASSIC VOLCANISM OF THE IPSWICH BASIN (Mesozoic 96 Paper)
		Pyroclastic rocks within the Chillingham Volcanics occur at the base of the Chillingham Volcanics and mark the initiation of volcanic activity and a depositional environment where ever the unit is preserved.
		Pyroclastic rocks are volumetrically most significant in the northern occurrences of the Chillingham Volcanics where only one eruptive cycle is preserved.
		Where two cycles of activity are preserved, the initial pyroclastic rock deposits (prior to lava effusion) are the thickest, with comparatively thin deposits occurring between successive lava effusion cycles.
	www.geocities.com /aroach.geo/geology/meso96 (4098 words)

	ARISTARCHUS REGION
		This dark mantling deposit probably consist primarily of iron-rich glass spheres (pyroclastics or cinders), and has a deep red color on this image.
		The subsurface compositions, buried beneath a few meters or tens of meters of pyroclastics or Aristarchus ejecta, are revealed by craters which penetrated the surface layers, and by steep slopes such as those along the walls of the rilles.
		From this mosaic, we can see that the plateau is composed of a complex mixture of materials, but that the rilles formed primarily in lavas, except for the cobra-head crater of Vallis Schroteri, which formed in highland materials.
	www.ltpresearch.org /aristarchus4.htm (689 words)

	[No title]
		The references pertain to volcanism, volcanoes and volcanic rocks with emphasis upon the pyroclastic rocks.
		The role of fluidization in the emplacement of pyroclastic flows: an experimental approach.
		Morphology and rheology of pyroclastic flows and their deposits, and guidelines for future observations.
	volcanology.geol.ucsb.edu /tz.htm (1758 words)

	Okataina Volcanic Center, New Zealand (Site not responding. Last check: 2007-10-01)
		Tarawera is made of 11 rhyolite domes and pyroclastics.
		The main explosive pyroclastic eruption produced an estimated 0.3 cubic miles (1.3 cubic km) of ash.
		Nuee ardentes deposited pyroclastic material to the south, east, and north.
	volcano.und.edu /vwdocs/volc_images/img_tarawera.html (601 words)

	Sapphire
		The occurrence of sapphire in Queensland is associated with Tertiary and Quaternary alluvial deposits derived from the weathering and erosion of alkali-volcanic rocks, mainly basaltic lavas, pyroclastics and volcaniclastics of Tertiary age and underlying Palaeozoic basement rocks.
		On the Anakie field basaltic lavas, pyroclastics and underlying granitic and metamorphic rocks were weathered and eroded to form alluvial deposits in a Tertiary palaeodrainage system.
		Typically the wash consists of 'billy' (quartzite) boulders, quartz and rock fragments of basaltic lavas, pyroclastic and volcanicalstic rocks and older basement rocks set in a silty or clayey matrix.
	www.nrm.qld.gov.au /mines/fossicking/sapphire.html (933 words)

	Untitled Document
		Pyroclastics flows consist of a mixture of volcanic gases and ash and are generated during many volcanic eruptions.
		A most dangerous situation develops if pyroclastic flows are generated on snow or glacier covered volcanoes, causing the cover to melt.
		The only effective method of risk mitigation is evacuation prior to such eruption from areas likely to be affected by pyroclastic flows.
	www.sveurop.org /gb/articles/articles/volchazards2.htm (1488 words)

	Volcano(2)
		Strato volcanoes are more like cones, and are made out of thick viscous, pasty lava and pyroclastics.
		Cinder cones are like mini strato volcanoes, and are basically made by tephra falls, or ash falls, and pyroclastics.
		As the lava is hurled through the air it cools, creating pyroclastics and tephra.
	members.tripod.com /~midju/6.htm (507 words)

	Morphology of Kimberlite
		Around the crater is a tuff ring which is relatively small, generally less than 30 meters, when compared to the diameter of the crater.
		Two main categories of rocks are found in crater facies kimberlite: pyroclastic, those deposited by eruptive forces; and epiclastic, which are rocks reworked by water.
		A. Pyroclastic Rocks: These rocks are found preserved in tuff rings around the crater and within the crater.
	www.eos.ubc.ca /research/diamonds/kopylova/intro/morphology.html (645 words)

	t-parahutxt
		At the same time similar volcanic activity was occuring at the centres to the east of Tangkubanperahu where a complex volcanic structure exists.
		Another volcanic cone was built up filling the Caldera on the eastern side, with the youngest pyroclastics and flows overflowing the Caldera rim on the south and NNE sides.
		Scoriaceous basaltic andesite flows from Tangkubanparahu are found up to 25 km NNE of the summit crater, and flows and pyroclastics are found up to 1 km to the south towards Bandung.
	www.vsi.esdm.go.id /pbumi/java/t-parahutxt.html (1104 words)

	Lab 1:
		Pyroclastic density currents: A rapid, extremely hot, downward stream of particles and
		Can be 800ºC or more and may move at speeds exceeding 150 kilometers per hour.
		Lahar: A flow of pyroclastic material mixed with water.
	www.wsu.edu /~geology101/lab/documents/5bd.htm (177 words)

	Volcano Books
		A composite volcano is constructed from alternating layers of pyroclastics and rock solidified from lava flows.
		Pyroclastics are fragments of rock formed by volcanic explosions.
		Mount St. Helens is a composite volcano, also called a stratovolcano.
	www.vibrationdata.com /VolcanoBooks.htm (948 words)

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