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Topic: Sunda Arc

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	Sunda Arc - Wikipedia, the free encyclopedia
		The Sunda Arc is a volcanic arc that has produced the islands of Sumatra and Java and the Sunda Strait and the Lesser Sunda Islands.
		The arc marks an active convergent boundary between the East Eurasian plates that underlie Indonesia, especially the Sunda Plate and the Burma Plate, and the Indo-Australian Plate that also forms the seabed of the Indian Ocean and the Bay of Bengal.
		The Sunda Arc is a classic example of a volcanic island arc, in which all the elements of such geodynamic features can be identified.
	en.wikipedia.org /wiki/Sunda_Arc (168 words)

	Island arc - Wikipedia, the free encyclopedia
		An island arc is a type of archipelago formed by plate tectonics as one oceanic tectonic plate subducts under another and produces magma.
		Partial melting of the overriding mantle generates low-density, calc-alkaline magma that buoyantly rises to intrude and be extruded through the lithosphere of the overriding plate.
		On the subducting side of the island arc is a deep and narrow oceanic trench, which is the trace at the Earth’s surface of the boundary between the downgoing and overriding plates.
	en.wikipedia.org /wiki/Island_arc (240 words)

	6 Isotope geochemistry of oceanic volcanics
		Island arcs are central to the understanding of mantle evolution because they represent the site where lithospheric material of various types is returned to the deep mantle.
		LREE enriched basalts and andesites from Grenada, the Sunda arc, and the Aeolian arc of southern Italy fall off the mixing line between depleted arcs and a typical sediment represented by ‘post Archean average shale’ (PAAS).
		Since the Pb contents of arc volcanics are nearly an order of magnitude lower than those of typical sediments, it is unlikely that the sediment signature is itself controlled by erosion of arc volcanics.
	www.onafarawayday.com /Radiogenic/Ch6/Ch6-6.htm (3590 words)

	GEOPHYSICAL INSTITUTE (Site not responding. Last check: 2007-11-05)
		This phenomenon, represented by an almost horizontally distributed strip of earthquake foci in the depth around 100 km, is generally explained as a continuation of the subducting oceanic lithosphere (Špičák et al., 2004c).
		In the region of Java five segments, in the region of Sunda arc between 111˚E and 122˚E seven segments were delimited.
		Seismic activity around and under Krakatau volcano, Sunda Arc: constraints to the source region of island arc volcanics.
	www.ig.cas.cz /activities/Rocenka02-3/Key_Tectonics.php (614 words)

	GINCO [B3.22] (Site not responding. Last check: 2007-11-05)
		From the results of the GINCO I project there is evidence for the existence of two accretionary wedges along the Sunda Arc: wedge I is of assumed Paleogene age and wedge II of Neogene to Recent age (Fig.
		It is speculated that the SFZ originally was attached to the Cimandiri-Pelabuhan-Ratu strike-slip faults and shifted from the volcanic arc position into the forearc basin area due to clockwise rotation of Sumatra with respect to Java as well as due to increasingly oblique plate convergence since the late Lower Miocene.
		We explain the transtension of the western Sunda Strait (Semangka Graben) and the transpression with inversion of the eastern Sunda Strait, along the newly detected Krakatau Basin, by this rotation.
	www.bgr.de /b322/text/e_sunda.htm (1049 words)

	Title: Earth Resources on the Island Arc Setting: a Case of Sunda Arc, Indonesia (Site not responding. Last check: 2007-11-05)
		An island arc is narrow volcanic island produced at a tectonic boundary between an oceanic plate and outer margin of continental plate.
		This island arc is produced by northward subduction of Indo-Australian oceanic plate underneath the southern margin of
		The destructive plate margin produces arc magmatism and a long chain of volcanoes that are directly associated with the formation of metal (gold, copper) deposits and geothermal fields.
	xrd.mine.kyushu-u.ac.jp /project/sunda.html (615 words)

	Indonesia is the largest archipleagic state in the world comprising five major islands and about 300 smaller island ... (Site not responding. Last check: 2007-11-05)
		The Sunda shelf area (or Sundaland to several authors) lies to the west, and the Sahuls shelf area to the east, separated by a geologically complex region of deep sea basins and island arcs.
		The volcanic arc comprises Sumatra and Java and extends further eastward into the Lesser Sunda Islands of Bali, Lombok, Sumbawa, Flores and the smaller islands rimming the Banda Sea to the east and northeast.
		The non-volcanic outer arc comprises the islands west of Sumatra and a submarine ridge south of Java, with the non-volcanic islands of Timor, Tanimbar, Kai and Seram believed to be its eastern continuation.
	www.iagi.or.id /indonesia_geology/introduction/introduction.htm (3811 words)

	McCaffrey Publications (Site not responding. Last check: 2007-11-05)
		Silver, E.A., D.R. Reed, R. McCaffrey and Y. Joyodiwiryo, Backarc thrusting in the eastern Sunda Arc, Indonesia: A consequence of arc-continent collision, Journal of Geophysical Research, 88, 7429-7448, 1983.
		McCaffrey, R., and J. Nabelek, The geometry of backarc thrusting along the eastern Sunda Arc, Indonesia: Constraints from earthquake and gravity data, Journal of Geophysical Research, 89, 6171-6179, 1984.
		McCaffrey, R., and G.A. Abers, Orogeny in arc-continent collision: the Banda arc and western New Guinea, Geology 19, 563-566, 1991.
	ees2.geo.rpi.edu /rob/www/pubs_all.htm (1842 words)

	Island arc - the free encyclopedia (Site not responding. Last check: 2007-11-05)
		An island arc is a type of archipelago formed by
		seismic epicenters located at increasing depth under the island arc.
		This process has happened over and over in the geologic history of the Earth.
	www.free-web-encyclopedia.com /?t=Island_arc (207 words)

	Petrogenesis of High-K Arc Magmas: Evidence from Egmont Volcano, North Island, New Zealand
		Subduction-related volcanics are characterized by a distinctive `arc' signature observed in the trace element abundance patterns, and this is argued to arise from partitioning of trace elements between fluid and residual phases (Perfit et al.
		Variation across the arc from Ruapehu to Taranaki in part reflects contrasts in the composition of parental magmas because of (1) variation in the degree of depletion of the mantle wedge, (2) contrasts in the composition of fluid fluxed from the subducting slab, and (3) declining degrees of partial melting across the subduction system.
		Foden, J. The petrology of the calc-alkaline lavas of Rindjani Volcano, east Sunda arc: a model for island arc petrogenesis.
	library.iem.ac.ru /j-petr/1-4099/html/egc007_gml.html (12970 words)

	Colorado Geology Overview
		Shortly thereafter, this juvenile arc collided with the Wyoming Province, driving intervening 2.1 Ga oceanic lithosphere to the north, beneath the southern edge of the Wyoming craton.
		The Cheyenne Belt, the 1.78 Ga suture between the Green Mountain arc and the Archean Wyoming Province craton, barely grazes the NW corner of Colorado.
		Overthrusting during the arc-continent collisions buried arc rocks to depths of 11-16 km (7-10 mi) and severely folded and faulted them at high temperatures and pressures.
	www.cliffshade.com /colorado/geo_overview.htm (10393 words)

	Geoscience Australia: AUSGEO News tsunami warning
		The largest earthquake-generated tsunamis in the eastern Sunda Arc are actually normal faulting events in the Australian plate, in the ‘outer rise’ where the subducting plate bends prior to diving beneath Indonesia.
		Farther to the north-west in the Sunda Arc, relatively young (40 million years) oceanic lithosphere subducts offshore Sumatra.
		The subduction of such young oceanic lithosphere in the Pacific Ocean is associated with most of the massive earthquakes that generate the huge tsunamis that pose a threat to the entire Pacific basin.
	www.ga.gov.au /urban/geohazardupdates/tsunami/tsunami_ausgeo.jsp (1517 words)

	TrustOO: sunda B2B B2C (Site not responding. Last check: 2007-11-05)
		Pusaka Sunda is a gamelan degung ensemble directed by Burhan Sukarma and Rae Ann Stahl.
		Pusaka Sunda is dedicated to performing traditional and contemporary gamelan degung music.
		SUNDA: a language of Indonesia (Java and Bali) SUNDA: a language of Indonesia (Java and Bali) A page from the Web edition of Ethnologue: Languages of the World (14th edition) giving basic facts about the language and where it is spoken.
	trustoo.com /sunda.html (175 words)

	TSUNAMIS OF THE INDIAN OCEAN - by Dr. George Pararas-Carayannis
		A divergent boundary separates the Burma plate from the Sunda plate in the north.
		The major tectonic feature in the region is the Sunda Arc that extends approximately 5,600 km between the Andaman Islands in the northwest and the Banda Arc in the east.
		The Sunda Arc consists of three primary segments; the Sumatra segment, the Sunda Strait Segment and the Java Segment.
	www.drgeorgepc.com /Tsunami2004IndianOcean.html (2747 words)

	studie (Site not responding. Last check: 2007-11-05)
		The subduction of the India-Australia plate beneath Eurasia at the Sunda arc varies significantly along strike.
		Relative plate motion is nearly orthogonal to the trench south of Java, but to the west, off Sumatra, subduction is highly oblique and the plate motion is partially accommodated by the right-lateral Sumatran fault.
		In addition to the change in orientation, the subducting plate increases in age from west to east by ~100 Ma along the arc.
	www.ig.cas.cz /Czech/Confer/abercrombie.htm (568 words)

	Terrestrial Ecoregions -- Lesser Sundas deciduous forests (AA0201)
		The Lesser Sundas Deciduous Forests [AA0201] are found on a string of volcanic islands.
		The islands represent tertiary and quaternary volcanoes that have coalesced with lava and sediment.
		These are Lesser Sundas Deciduous Forests [AA0201], which includes the chain of islands extending from Lombok, Sumbawa, Komodo, Flores, and the smaller satellite islands corresponding to the Flores biogeographic unit; Timor and Wetar Deciduous Forests [AA0204], corresponding to the Timor biogeographic unit; and the Sumba Deciduous Forests [AA0203], corresponding to the Sumba biogeographic unit.
	www.worldwildlife.org /wildworld/profiles/terrestrial/aa/aa0201_full.html (1798 words)

	Orogenic Andesites (Site not responding. Last check: 2007-11-05)
		The arc is about 3200km long with approximately 100 volcanoes of which 40 are active giving rise to 170 eruptions in the last 100 years.
		This is a depression between the Tonga Kermadec Arc, and the arc formed by the Lau Islands east of Fiji.
		The TK arc is however usually thought of as terminating at the southern Kermadec Island group, though the Tongan Trench (and the volcanic activity) continues southward.
	www.geokem.com /orogenic-3.html (5942 words)

	Dictionary of Meaning www.mauspfeil.net
		Image:Tectsetting lg.gif thumb300pxWestern Sunda Arc and Trench showing tectonic and seismic activity.
		The '''Sunda Arc''' is a volcanic arc that has produced the islands of Sumatra and Java (island) Java and the Sunda Strait and the Lesser Sunda Islands.
		There you find a list of all editors and the possibility to edit the original text of the article Sunda Arc.
	www.mauspfeil.net /Sunda_Arc.html (205 words)

	STRAIN PARTITIONING IN THE ACTIVE BANDA ARC-CONTINENT COLLISION DETERMINED BY NEW GPS MEASUREMENTS (Site not responding. Last check: 2007-11-05)
		Detailed GPS measurements during 2001-2003 in the transition between subduction and collision of the Banda arc reveal how strain is partitioned away from the trench and distributed to other parts of the arc-trench system.
		(1996) conducted a GPS campaign (1992-1994) throughout the Eastern Sunda arc that demonstrated partial accretion of the arc to the Australian plate.
		We reoccupied many of the sites from this earlier study and 7 additional stations, 3 of which are new benchmarks.
	gsa.confex.com /gsa/2004AM/finalprogram/abstract_80316.htm (270 words)

	The Control of Lithium Budgets in Island Arcs
		Measurements of the Li isotopic compositions of lavas from magmatic arcs worldwide suggest common processes at work that lead to the retention of isotopically heavy Li in the mantle.
		Samples from this study derive from the Kurile arc, eastern Russia, the Sunda arc, Indonesia, and a segment of the Aleutian arc, western Alaska.
		The results indicate conditions appropriate for mantle “buffering” of slab-derived Li are widespread in magmatic arcs.
	www.geol.umd.edu /~tomascak/liarcs.htm (388 words)

	Executive Summary
		Current seismicity is however not evenly distributed along the plate boundaries and instrumental and historical seismicity records indicate that the Sunda arc has been highly affected by large to major earthquakes in the north-western part whereas large events have been almost missing along its south-eastern extremity.
		Furthermore, high seismicity and frequent large earthquakes have affected the Philippine arc east of the Philippines, whereas the north-western subduction zone along the Manila trench appears to be less active seismically.
		Along the Banda Arc, collision occurs between the Australian continental lithosphere and a complex block assemblage in the area of the triple junction between the Pacific/Philippine Sea plate, the Australian plate, and Sundaland.
	www.gfz-potsdam.de /pb1/pg1/neha/geodyssea/geodyssea.html (2952 words)

	Publications - Hoog96 (Site not responding. Last check: 2007-11-05)
		Zirconolite in K-rich calc-alkaline lavas from Lewotolo volcano (E. Indonesia): Late-stage mobility of HFSE and REE in arc magmas.
		The rare mineral zirconolite (CaZrTi2O7) is present as an accessory phase in potassium-rich calc-alkaline subduction related lavas from Lewotolo volcano, East Sunda Arc, Indonesia.
		Th/U ratios in the Lewotolo zirconolites average around 2.7, which is less than the bulk rock ratios of the lavas (~4), which suggests a difference in mobility between these elements during late magmatic stages.
	www.geo.uu.nl /Research/Petrology/hoog96.htm (453 words)

	Helium, Argon and Methane Studies: The Sunda-Banda Arc, Indonesia - Storming Media
		Abstract: The expedition to Indonesia, led by Dr. Varekamp, consisted of the collection of high temperature volcanic gases and phenocryst-bearing lavas from 3 islands of the archipelago.
		The aim of the expedition was to provide helium, argon and methane isotope and abundance analysis along the strike of the eastern Sunda Arc, and to compare these results with analysis made by Dr. Varekamp on Snellius Expedition in 1984 when he collected volcanic gases from the adjacent Banda volcanic arc.
		In this way, it was planned to obtain a unique suite of geothermal gases contrasting the effects of oceanic crust subduction along the Sunda Arc with continental subduction along the Banda Arc.
	www.stormingmedia.us /66/6663/A666312.html (201 words)

	Petrologie- Publications M.J. van Bergen (Site not responding. Last check: 2007-11-05)
		The origin of the potassic rock suite from Batu Tara volcano (East Sunda Arc, Indonesia).
		Carbon sources in arc volcanism, with implications for the carbon cycle.
		The tectonic emplacement of Sumba in the Sunda-Banda Arc: paleomgnetic and geochemical evidence from the early Miocene Jawila volcanics.
	www.geo.uu.nl /Research/Petrology/publ_Bergen.htm (427 words)

	Orogenic Andesites (Site not responding. Last check: 2007-11-05)
		Island arcs are curved chains of andesite-type volcanoes usually occurring a few tens to a few hundred miles to seaward of a continental margin.
		In general the trends in orogenic series are iron-enriched in the juvenile arcs, (sometimes called a "tholeiitic" trend) becoming richer in alumina and poorer in Fe-Ca-Mg in the mature sectors of the older continents.
		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 /orogenic-summary.html (1802 words)

	[No title] (Site not responding. Last check: 2007-11-05)
		Subducted oceanic slab is found below most of the Sunda arc but with varying depth penetration.
		A 500 km long slab under Burma is separated from the Andaman-Sumatra slab (~700 km deep) by a 300-400 km wide gap spatially associated with the Andaman Basin.
		The central Sunda slab penetrates the lower mantle to a depth of 1500 km, but subduction below the Banda arc is confined to the upper mantle (700 km).
	aapg.confex.com /aapg/ba2000/techprogram/paper_3922.htm (293 words)

	A helium isotope transect along the Indonesian archipelago
		He ratios show that helium in these volcanic terrains is dominantly primordial helium from the mantle wedge above the sinking slab, rather than radiogenic helium from subducting oceanic crust or sediments.
		He measurements along a 1,800-km section of the Sunda arc, a region of underthrust oceanic lithosphere, showing MORB-like ratios from western Java to a surprisingly sharp transition zone centred on Lomblen Island, where the low ratios of the Banda arc begin.
		He ratios, with a well-defined transition to the much lower Banda arc ratios near Lewotolo volcano, and demonstrate a remarkable linkage of helium isotope variations with tectonic processes not readily discernible with trace elements or other isotopes.
	www.nature.com /nature/journal/v342/n6252/abs/342906a0.html (419 words)

	Global Volcanism Program \| Volcanoes of the World \| Volcanoes of Indonesia \| Data Sources
		The geochemistry and petrogenesis of K-rich alkaline volcanics from the Batu Tara volcano, eastern Sunda arc.
		Volcanism and tectoinics in the eastern Sunda arc, Indonesia.
		Petrogenesis of Batur caldera, Bali, and the geochemistry of Sunda-Banda arc basalts.
	www.volcano.si.edu /world/region.cfm?rnum=06&rpage=sources (3761 words)

	January GEOLOGY and GSA TODAY media highlights
		The Sunda-Banda arc (Indonesia) is in the process of changing from a subduction regime, where an oceanic plate sinks back into the mantle, to a collision regime, where the attempted subduction of the buoyant Australian continent halts the subduction process.
		We investigate the existence of a mechanism of triggering driven by the interaction of offshore normal faults in the Middle American subduction zone and continental strike-slip faults in the El Salvador volcanic arc.
		The increase in the mantle temperature following the detachment produced a belt of basaltic volcanism with ages progressively younger to the east from 11 to 5 Ma.
	www.eurekalert.org /pub_releases/2004-01/gsoa-jga010604.php (2464 words)

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