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Topic: Andesite Line


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  Pacific Ocean
The Andesite Line follows the western edge of the islands off California and passes south of the Aleutian arc, along the eastern edge of the Kamchatka Peninsula[?], the Kuril Islands, Japan, the Mariana Islands[?], the Solomon Islands, and New Zealand.
Within the closed loop of the Andesite Line are most of the deep troughs, submerged volcanic mountains, and oceanic volcanic islands that characterize the Central Pacific Basin[?].
Outside the Andesite Line, volcanism is of the explosive type, and the so-called Pacific rim[?] of fire is the world's foremost belt of explosive volcanism.
www.ebroadcast.com.au /lookup/encyclopedia/pa/Pacific.html   (1860 words)

  
  Andesite Line - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-10-16)
The Andesite Line follows the western edge of the islands off California and passes south of the Aleutian arc, along the eastern edge of the Kamchatka Peninsula, the Kuril Islands, Japan, the Mariana Islands, the Solomon Islands, and New Zealand.
Within the closed loop of the Andesite Line are most of the deep troughs, submerged volcanic mountains, and oceanic volcanic islands that characterize the Central Pacific Basin.
Outside the Andesite Line, volcanism is of the explosive type, and the Pacific Ring of Fire is the world's foremost belt of explosive volcanism.
en.wikipedia.org /wiki/Andesite_Line   (248 words)

  
 geology glossary
The geographic boundary between the basalts and gabbros of the Pacific Ocean basin and the andesites at the subductive margins of the surrounding continents.
The portion of a beach that extends from the high-tide line inland to the sea cliff or vegetation line.
The horizontal line marking the intersection between the inclined plane of a solid geological structure and the Earth's surface.
earthsci.org /education/teacher/geoglos/geoglos.htm   (13607 words)

  
 Andesite: World of Earth Science
The transition from the oceanic crust of the main basin of the Pacific to the andesitic rocks around its perimeter is termed the andesite line.
Andesites are ordered in three classes according to the identity of their non-feldspar components: from most silicic to most mafic, these are (1) quartz-bearing andesites, (2) pyroxene andesites, and (3) biotite and hornblende andesites.
Andesite's character usually results from the melting and assimilation of rock fragments by magma rising to the surface.
science.enotes.com /earth-science/andesite   (393 words)

  
 Mars Pathfinder Page
Andesite is a common igneous rock on the earth and its name derives from the Andes mountains which are composed largely of it.
Andesite is a more complex form of cooled lava than basalt as its composed of more minerals which makes it more viscous (hence it does not easily flow to make Shield Volcanos (Hawaiian Islands) or flat plateaus (Columbia River Plains; Snake River Plains.
Andesite is an extrusive igneous rock with intermediate chemistry and is composed largely of plagioclase.
zebu.uoregon.edu /mars/andesite.html   (209 words)

  
 Pacific Ocean - Wikipedia, the free encyclopedia
North of the equator and west of the international date line are the numerous small islands of Micronesia, including the Caroline Islands, the Marshall Islands, and the Mariana Islands.
In the southwestern corner of the Pacific lie the islands of Melanesia, dominated by New Guinea.
Continental islands lie outside the Andesite Line and include New Guinea, the islands of New Zealand, and the Philippines.
en.wikipedia.org /wiki/Pacific_Ocean   (2034 words)

  
 EvC Forum: Geology Glossary
Andesitic magma is believed to originate from fractionation of partially melted basalt.
The line formed by the intersection of the axial plane with the bedding surface.
A hollow nodule of rock lined with crystals; when separated from the rock body by weathering, it appears as a hollow, rounded shell partly filled with crystals.
www.evcforum.net /WebPages/Glossary_Geology.html   (7529 words)

  
 Sarmisegetusa
The line of the North coincides exactly with the arrow of the so-called Andesite Sun.
Aerial view of Sarmisegetusa, the heart of the Dacian capital, lying to this day at the end of a forest road 20km long, destroyed (or mutilated) annually and passionately by the "architect" Godeanu, the mountain which "rules" over the neighbourhood and which is said to be the Kogaion, the Sacred Mountain of the Dacians.
The arrow of the andesite sun indicates the North and points to the "heart" of the oblong temple which, according to General Dragomir, can be a model of our planetary system.
www.dacia.org /html/sarmisegetusa.html   (423 words)

  
 PATHFINDER RESULTS PREDICTED BY GSFC SCIENTISTS   (Site not responding. Last check: 2007-10-16)
The recent exciting result of an "andesitic" composition for the rock "Barnacle Bill" on Mars, and the resulting conclusion that Mars is probably geologically more like the Earth than like the Moon, was actually anticipated years ago by GSFC scientists.
Pure glassy andesites are rare, but glass is of frequent occurrence in the groundmass of andesites, commonly in a devitrified state.
The 'Andesite Line' is the boundary between the 'continental' andesitic association and the 'oceanic' basaltic association.
denali.gsfc.nasa.gov /research/lowman/mars/andesite.html   (441 words)

  
 andesite - Hutchinson encyclopedia article about andesite
Andesite erupts from volcanoes at destructive plate margins (where one plate of the Earth's surface moves beneath another; see plate tectonics), including the Andes, from which it gets its name.
However, the rover's study of a Martian rock called Barnacle Bill indicates that it resembles andesite, a volcanic rock often formed by several cycles of heating and cooling, although not as many as granite.
TOC 06-44 was drilled along the same cross section as drill hole TOC 06-43, but aimed in the opposite direction, to probe the width of the capping andesite and to define the eastern limit of shallow gold mineralization just beyond the andesite.
encyclopedia.farlex.com /andesite   (256 words)

  
 Geology 105 - Lecture Key Points
Andesite (and its plutonic equivalent diorite) are the rocks of subduction zones.
Andesite is produced as the oceanic plate -- composed of mafic basalt, felsic sediments, and lots of water -- descends.
Ultimately, after an ocean plate has been completely subducted, the continental plates that border the departed ocean collide because neither is dense enough to subduct.
faculty.washington.edu /sechern/ess105/key/061120.html   (357 words)

  
 Orogenic Andesites
Virtually all andesites are associated with a subduction zone where oceanic crust underthrusts a continent or has done so in the past, the andesites generally becoming more potassic as well as richer in Cs, Rb, Ba, U and Th inland from the subduction zone in regions of thicker crust.
Andesite series tend to have a highly variable composition, so much so it is difficult to define precisely what we mean by an andesite.
The ultra-high K rocks near the base are leucitic andesites from Tambora, Muriah and Batu Tara in the Sunda Arc, and from Stromboli, Vulcano in the Aeolian Arc.
www.geokem.com /Andesite-summary.html   (1830 words)

  
 Military Geology of Palau Islands, Caroline Islands
Coast lines of the volcanic islands are irregular, and small bays are numerous.
The so-called "andesite line" which marks the margin of the Pacific basin has been drawn along the outer (eastern) edge of the Palau and Yap trenches It separates the region of predominantly andesitic volcanism on the west from the Pacific basin region of basaltic volcanism, and is a major structural and physiographic boundary as well.
The magnesian olivine and augite of the basaltic rocks are thus replaced by hypersthene, clinopyroxenes, and magnetite in the andesites.
www.geocities.com /ctrlburn/geology.html   (7144 words)

  
 CalendarHome.com - Pacific Ocean - Calendar Encyclopedia   (Site not responding. Last check: 2007-10-16)
Indonesia, the Philippines, Japan, New Guinea, and New Zealand—all eastward extensions of the continental blocks of Australia and Asia—lie outside the Andesite Line.
Within the closed loop of the andesite line are most of the deep troughs, submerged volcanic mountains, and oceanic volcanic islands that characterize the Pacific basin.
Outside the Andesite Line, volcanism is of the explosive type, and the Pacific Ring of Fire is the world's foremost belt of explosive volcanism.
encyclopedia.calendarhome.com /cgi-bin/encyclopedia.pl?p=Pacific_Ocean   (1794 words)

  
 CVO Website - Canada Volcanoes and Volcanics
Andesite lava flows (500,000 to 1,000,000 years old) are the most abundant rock type and their maximum total flow thickness is over 1 km.
The volcano is dominated by porphyritic andesite to rhyodacite lava and pyroclastic breccias, although several Quaternary basalt flows and breccias occur on the periphery.
Plagioclase porphyritic andesite lava flows and breccia (0.5 to 1.0 million years ago) are the most voluminous rocks, with a maximum of 1,200 meters of total flow thickness.
vulcan.wr.usgs.gov /Volcanoes/Canada/description_canadian_volcanics.html   (4941 words)

  
 Geology 3111 -- Field Trip Guide -- Spring 1999   (Site not responding. Last check: 2007-10-16)
The largest of the exposed andesite bodies is found on the university campus (up the hill by the Geology building is a good place to view the andesite) and is therefore called the Campus Andesite.
Characteristic of the andesite is the numerous cracks or joints as well as the yellow-brown color on the weathered surface.
The yellow color of the andesite is due to the oxidation of the iron minerals in the andesite.
www.epcc.edu /ftp/Homes/krimkus/fieldtrip.html   (2786 words)

  
 PSRD: Using TES to interpret the composition of the Martian surface
The other way of making andesite is by removing crystals as they form in basalt magma, a process called fractional crystallization.
For simplicity, I'll stick with andesite.) McSween and members of the Mars Pathfinder team have argued that this process could not produce the large volume of andesite observed (if it is really andesite).
On the other hand, if andesite formed by fractional crystallization, it ought to be associated more intimately with the basalt, rather than concentrated in different places.
www.psrd.hawaii.edu /May02/MarsTES.html   (2298 words)

  
 Volcanology and geology of the ocean: the history of interaction, VII International Congress
In the mentioned book, the editor and the authors (J.H.F. Umbgrove and H.H. Hess) introduced the term, which was new for the Soviet geologists: the ande­site line (the strip on the globe, where the chemical composition of igneous rocks changes from basic to acid).
One can conclude that the "andesite line" gestalt was formed in 1940, due to the accumulation of the data of the petrochemical composi­tion of the rocks.
Possibly, the "andesite line" gestalt was constructed on the base of the "comag­matic provinces" image (gestalt), introduced by H.S. Washington in 1906.
vitiaz.ru /congress/en/thesis/143.html   (2240 words)

  
 Department of Geological & Atmospheric Sciences
andesite line The geographic boundary between rocks of the Pacific Basin, which are basaltic, and those around the rim of the basin, which are in part andesitic.
equilibrium line On a glacier the line separating the zone of accumulation from the zone of ablation.
Outer layer of chalcedony lined with crystals that project toward the hollow center.
www.ge-at.iastate.edu /courses/Geol_100/old_files/glossary.v2.html   (14105 words)

  
 Mitad del Mundo - Historical decription
It is made out of iron and cement, covered with the coating of polished and cut andesite stones; this material was taken out of "La Marca" mountain, which is quite close to the monument.
This line passes through many nations and different continents; however there is only one country reclining on the Pacific Ocean that bears its name, the "Republic of Ecuador" (1830).
The quadrangular pyramid, with its four monoliths on its angled bases, which have the same geographic orientation, ends on its top with a spherical metal globe that represents the Earth with its respective relief of the five continents and the oceans.
www.equaguia.com /mitaddelmundo/historical.html   (661 words)

  
 Australia
The line formed by these trenches, called the sial or andesite line, marks a division between two vastly different types of rock fundament.
East of the line, in sharp contrast, the rock type is mainly basalt caused by massive quantities of molten magma which have flowed up through the plate to form the many mid-ocean ridges and to spread thick crusts over some of the ocean floor.
West of the line, the land masses are much larger and closer together than are those of the volcanic type on the East.
www.pac-island.com /PacificMap/australia1.htm   (9713 words)

  
 Pacific Islands - Printer-friendly - MSN Encarta
The oceanic high islands, sometimes called volcanic islands, are divided from the continental high islands by a north-south boundary of rock formations beneath the sea called the Andesite line.
The oceanic islands are composed of volcanic materials that were forced upward through cracks, or fissures, in the ocean floor and from newly deposited sediments.
By mid-1942, the peak of the Japanese advance, nearly all of the Pacific north of Australia and west of the international date line was under Japanese control.
encarta.msn.com /text_761595628___0/Pacific_Islands.html   (6977 words)

  
 Andesite Summary
Andesite is an igneous, volcanic rock, of intermediate composition, with aphanitic to porphyritic texture.
Classification of andesites may be refined according to the most abundant phenocryst.
Ultimately, the resultant composition of andesite and intermediate magmas is the result of fractional crystallisation, assimilation, partial melting and contaminaton by the subducted slab.
www.bookrags.com /Andesite   (906 words)

  
 Vol_Magma viscosity
Four types of magma, basalt, andesite, dacite, and rhyolite, are recognized based on their composition.
Andesite is derived from the partial melting of descending oceanic lithosphere.
The rising basaltic magma provided the heat source to melt surrounding continental crust and generate rhyolite that is present throughout the Park, often in association with basalt.
www.mhhe.com /earthsci/geology/mcconnell/volcanoes/magma.htm   (1014 words)

  
 PACIFIC OCEAN FACTS AND INFORMATION   (Site not responding. Last check: 2007-10-16)
The Andesite Line follows the western edge of the islands off California and passes south of the Aleutian arc, along the eastern edge of the Kamchatka_Peninsula, the Kuril_Islands, Japan, the Mariana_Islands, the Solomon_Islands, and New Zealand.
Indonesia, the Philippines, Japan, New Guinea, and New Zealand—all eastward extensions of the continental blocks of Australia and Asia—lie outside the Andesite_Line.
Outside the Andesite Line, volcanism is of the explosive type, and the Pacific_Ring_of_Fire is the world's foremost belt of explosive volcanism.
www.dontpayyourtaxes.com /Pacific_Ocean   (1867 words)

  
 Glossary for Planetary Science Research Discoveries | PSRD
The word andesite is derived from the Andes Mountains, located along the western edge of South America, where andesite rock is common.
Solar elongation: The angle between the lines of sight to the Sun and to the celestial body in question.
Scientists use instruments called spectrometers to study the location and spacing of emission and absorption (spectral) lines in specific wavelengths to detect any atoms or molecules that may be present in a target material (such as the surface of Mars).
www.psrd.hawaii.edu /PSRDglossary.html   (8654 words)

  
 GNS:Volcanoes
Swarms of small earthquakes that have regularly shaken Taupo in historical times appear to be associated with fault lines and the ongoing subsidence and widening of the region rather than the movement of magma.
Power and telephone lines will be broken and radios may not work due to the disturbed atmosphere and lightning.
Lines are contours (in metres) of equal tephra thickness and are a useful guide to the probable distribution of airfall tephra in another eruption from Taupo.
www.gns.cri.nz /what/earthact/volcanoes/nzvolcanoes/taupoprint.htm   (3884 words)

  
 Dacian Technology   (Site not responding. Last check: 2007-10-16)
The invisible line connecting Deva-Piatra Rosie-Banita is parallel to the one connecting Uroiu-Blidaru-Jigoru Mare.
The topographic line Omu-Racos is 60 km long and indicates the geographic North.
The arrow of the andesite sun, made up of 16 andesites, indicates exactly the geographic North and the middle of the once oblong temple.
www.dr-savescu.com /html/dacian_technology.html   (925 words)

  
 Big Sky Ski Resort - Skiing Andesite Mountain
Andesite Mountain is a small peak that rises abruptly up from the Mountain Village base area at Big Sky Resort.
The front side of Andesite Mountain is that portion of the mountain which faces the Mountain Village base area.
The front side of Andesite Mountain at Big Sky consists primarily of intermediate runs – all of which are excellent.
www.bigskyfishing.com /Montana-Info/skiing-big-sky-6.shtm   (1126 words)

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