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Topic: Chicxulub Crater

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Silverpit crater

Impact crater

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Crater

Lower Cretaceous

	Chicxulub crater, Mexico and the Cretaceous - Tertiary boundary
		The Chicxulub crater lies buried, straddling the northwest coastline of the Yucatán peninsula.
		Chicxulub is a peak-ring crater with a poorly known topographic ring occurring at 40 to 45 km radius from the crater's center.
		The edges of the crater correspond to a notch in the coastline in the east, and to a sharp bend southwards in the west.
	miac.uqac.ca /MIAC/chicxulub.htm (1701 words)

	Chicxulub Crater - Wikipedia, the free encyclopedia
		Chicxulub Crater is an ancient impact crater buried underneath the Yucatan peninsula, with its center located approximately underneath the town of Chicxulub, Yucatán, Mexico.
		The coordinates of the crater are 21°24′N 89°31′W.
		Another crater thought to have been formed at the same time is the Shiva crater.
	en.wikipedia.org /wiki/Chicxulub_Crater (1350 words)

	Chicxulub Crater
		The crater is buried under roughly 1 km of Cenozoic sediments rendering geophysical exploration methods essential for describing its structure and morphology.
		Chicxulub is certainly one of the largest impact structure on Earth and if the 300 km size estimate is proven correct, perhaps one of the largest produced in the inner solar system in the last 4 billion years.
		It is of utmost importance that the well-preserved Chicxulub impact crater be re-drilled.
	www.agu.org /revgeophys/claeys00/node8.html (611 words)

	Chicxulub Impact Crater (Site not responding. Last check: 2007-10-21)
		The seismic data reveal much of the crater's structure including the ~1 km-thick Tertiary sediments filling the crater, the crater edges, the peak ring, and the down-dropped blocks in the crater's zone of slumping.
		Chicxulub melt-rock is dated at 65.07 +/- 0.1 million years old, the same age as impact glass found at the KT boundary in Mexico and Haiti.
		With a diameter of at least 180 km and a depth of 45 to 6 5 km, Chicxulub is certainly one of the largest impact structures on Earth and perhaps one of the largest produced in the inner solar system in the last 4 billion years.
	geophysics.ou.edu /impacts/chicxulub.html (444 words)

	Chicxulub Crater
		The Chixculub Crater is believed to be the result of the collision with an asteroid measuring some 10 to 20 km across.
		The results suggest the crater was punched into the Earth around a third of a million years before the dinosaurs disappeared from the face of the planet.
		The Chicxulub impact occurred during this warming period and, although the environmental effects were severe, it did not cause the extinction of the dinosaurs.
	www.daviddarling.info /encyclopedia/C/Chicx.html (725 words)

	Terrestrial Impact Craters
		Impact craters are geologic structures formed when a large meteoroid, asteroid or comet smashes into a planet or a satellite.
		In larger craters, however, gravity causes the initially steep crater walls to collapse downward and inward, forming a complex structure with a central peak or peak ring and a shallower depth compared to diameter (1:10 to 1:20).
		Chemical, isotopic, and age studies demonstrate that the crater is the most probable source for the Ivory Coast tektites, which are found on land in the Ivory Coast region of central Africa and as microtektites in nearby ocean sediments.
	www.solarviews.com /eng/tercrate.htm (2496 words)

	The Chicxulub Debate
		Chicxulub predates the KT boundary and is not the cause for the end-Cretaceous mass extinction
		One of the major objectives of this project was to settle the controversial issue of the age of the impact breccia and hence the age of the Chicxulub impact (37).
		Backwash and crater infill is expected to erode, transport and redeposit material from the surrounding crater walls via slumps or gravity flows due to earthquakes or unstable topography, and by currents.
	geoweb.princeton.edu /people/faculty/keller/chicxpage2.html (3996 words)

	The Chicxulub Impact Crater - Effects
		It is difficult to explain the size of the extinctions, and the volume and distribution of ejecta at the boundary, from this lesser impact.
		Whilst both craters were formed in a target rock of similar composition (sandstones and carbonates), the compositions of their melt rocks are very different (Fig.
		The Chicxulub melt rocks are isotopically indistinguishable from K/T impact glasses, whilst the composition of the Manson melt rocks are significantly different (12).
	palaeo.gly.bris.ac.uk /communication/Hanks/eff.html (1963 words)

	Articles - Impact crater (Site not responding. Last check: 2007-10-21)
		An impact crater (impact basin or sometimes crater) is a circular depression on a surface, usually referring to a planet, moon, asteroid, or other celestial body, caused by a collision of a smaller body (meteor) with the surface.
		Few underwater craters have been discovered because of the difficulty of surveying the sea floor; the rapid rate of change of the ocean bottom; and the subduction of the ocean floor into the Earth's interior by processes of plate tectonics.
		The size of craters invariably changes over time; in the short term, craters shrink as a result of slumping, and over the longer term erosion and other geological processes quickly hide impact craters on the Earth.
	www.zdiamond.net /articles/Impact_crater (1970 words)

	Chicxulub Impact Crater \| Planeta
		The existence of the crater was first detected during offshore petroleum explorations in the 1950s.
		The crater was named after the nearby Mayan village of Chicxulub, and geologists continue to study the area.
		Whether or not the meteor's impact was responsible for the demise of the dinosaurs (first proposed in 1980 by Walter Alvarez of the University of California at Berkeley) is argued in scientific circles, but an obvious consequence of the impact can be found in the nearby geography.
	www.planeta.com /ecotravel/mexico/yucatan/chicxulub.html (328 words)

	Discovering the Crater
		It is a huge buried impact crater that is called Chicxulub, a Maya word that roughly translates as "tail of the devil." The crater, now buried beneath a kilometer-thick sequence of sediments, has been imaged using geophysical techniques that allow us to visualize underground structures.
		The asteroid or comet that produced the Chicxulub crater was roughly 10 km in diameter.
		The initial bowl-shaped crater was very unstable, and its walls quickly collapsed along a series of faults that enlarged the final diameter to between 145 and 180 km.
	www.lpl.arizona.edu /SIC/impact_cratering/Chicxulub/Discovering_crater.html (783 words)

	Images Of Chicxulub Crater (Site not responding. Last check: 2007-10-21)
		This is a radar image of the southwest portion of the buried Chicxulub impact crater in the Yucatan Peninsula, Mexico.
		It is this impact crater that has been linked to a major biological catastrophe where more than 50 percent of the Earth's species, including the dinosaurs, became extinct.
		The 180- to 300-kilometer-diameter (110- to 180-mile) crater is buried by 300 to 1,000 meters (1,000 to 3,000 feet) of limestone.
	www2.jpl.nasa.gov /neo/images/yucatan.html (453 words)

	Página del grupo de investigación del crár de Chicxulub del Instituto de Geofísica del ...
		Since the discovery of the Chicxulub crater, in Yucatan, several models about the effects of the impact, upon the planet, have been proposed.
		The crater diameter is 300 km, which means that the meteorite most have had a 10 km diameter and was traveling at 20 km/s, the peninsula was covered by a shallow sea (about 100 m deep).
		Actually the Chicxulub crater has yielded important parts of the puzzle, that were missing, about the massive extinction.
	www.igeofcu.unam.mx /chicxulub/english/divul.html (689 words)

	ScienceDaily: Yucatan Crater Linked To Mass Extinctions Of Dinosaurs
		This report on Mexico's Chicxulub crater will be presented by Dr. Gail Christeson, a research associate at UT Austin's Institute for Geophysics (UTIG), at the fall meeting of the American Geophysical Union in San Francisco.
		The Chicxulub crater is the first location where deformation at the base of the crust has been found in a terrestrial impact crater.
		The scientific team concluded that the Chicxulub crater is about 125 miles in diameter, and that 12,000 cubic miles of debris was blasted out of the earth by the impact.
	www.sciencedaily.com /releases/2000/12/001225061758.htm (1319 words)

	ScienceDaily: More Evidence Points To Impact As Dinosaur Killer
		Chicxulub is the only impact event that has been correlated with mass extinctions to date.
		Crater Chain On Two Continents Points To Impact From Fragmented Comet (March 17, 1998) -- A team of scientists working on two continents has discovered that a series of five craters on Europe and North America form a chain, indicating the breakup and subsequent impact of a comet or...
		Impact crater -- An impact crater is a circular depression on a surface, usually referring to a planet, moon, asteroid, or other celestial body, caused by a collision of a smaller body (meteor) with the...
	www.sciencedaily.com /releases/1998/03/980313024333.htm (1485 words)

	BBC NEWS \| Science/Nature \| Dino crater viewed from space
		The so-called Chicxulub crater - or rather what remains of it; it has since been filled in by limestone sediments - has become the focus of intense study in recent years.
		The Chicxulub image is part of the latest dataset to be released from the US space agency's (Nasa) Shuttle Radar Topography Mission flown in 2000.
		Asteroid or comet responsible for Chicxulub was roughly 10 km in diameter
	news.bbc.co.uk /1/hi/sci/tech/2837407.stm (591 words)

	Athena Review 2,1: Chicxulub crater in Yucatán
		This crater, variously estimated at 180-300 km in diameter, is one of the largest impact structures known on Earth, or other planets in the solar system such as Venus, where many craters have been studied.
		Besides the value of the Chicxulub impact to explain catastrophic events causing the end of the dinosaur era on earth, of equal importance is comparative data useful for planetary geology.
		The transient crater, or hole from the initial impact (fig.3), appears to have been 85 km in diameter, caused by a 10-14 km meteor.
	www.athenapub.com /crater1.htm (1191 words)

	ADU Web Site: Chicxulub Impact Crater Provides Clues to Earth's History
		The 200–300-kilometer wide crater lies buried beneath 1100 meters of limestone laid down in the intervening years and few clues of its presence remain at the surface.
		Argon and uranium-lead age determinations reveal that the melt rocks and the associated breccias are the same age as the tiny spherules of impact glass found within KT boundary deposits in Haiti and Mexico and the unmelted granitic fragments found in KT boundary exposures throughout western North America.
		The uppermost 2–3 kilometers of rocks involved in the Chicxulub collision are composed of calcium carbonate (limestone) and calcium sulfate (anhydrite).
	www.agu.org /sci_soc/sharpton.html (1323 words)

	Cambridge Conference Correspondence
		CHICXULUB PREDATES THE KT BOUNDARY AND IS NOT THE CAUSE FOR THE
		assumed that this is the crater of doom that caused the demise of the
		Chicxulub is the KT impact crater that caused the mass extinction.
	abob.libs.uga.edu /bobk/ccc/cc110203.html (1892 words)

	"Dinosaur-Killer" Asteroid Crater Imaged for First Time (Site not responding. Last check: 2007-10-21)
		The existence of the impact crater, Chicxulub, was first proposed in 1980.
		The Chicxulub data show a subtle, yet unmistakable, topographic indication of the impact crater's outer boundary: a semicircular trough 10 to 15 feet (3 to 5 meters) deep and 3 miles (5 kilometers) wide.
		The crater rim's instability caused the limestone to fracture along the rim, forming the trough.
	news.nationalgeographic.com /news/2003/03/0307_030307_impactcrater.html (782 words)

	ICDP Chicxulub - References (Site not responding. Last check: 2007-10-21)
		Arz, L.A., Arenillas, I. Foraminiferal biostratigraphy and environmental reconstruction at the Yaxcopoil-1 drillcore, Chicxulub crater, Yucatán Peninsula.
		Chicxulub Crater, Yucatan: Tektites, impact glasses, and the geochemistry of target rocks and breccias.
		Chicxulub: The third dimension of a multi-ring impact basin.
	www.icdp-online.de /sites/chicxulub/references/chicxpubs_01.htm (2894 words)

	Athena Review Image Archive: Yucatán: Gravity Maps of Chicxulub Crater
		This crater is one of the largest impact structures known on Earth, or elsewhere in the solar system.
		The transient crater, or hole from the initial impact, was about 85 km in diameter, caused by a 10-14 km meteor.
		The Chicxulub structure is classified as a multi-ring crater, the largest of several major types now known from planetary study.
	www.athenapub.com /chixgra1.htm (345 words)

	Computer modelling offers new insight into the formation of the Chicxulub crater in Mexico
		The Chicxulub crater is thought to have resulted from an impact with an asteroid or comet 65 million years ago.
		The group at the Imperial College TH Huxley School hope that their study will further the understanding of crater collapse; the final stage in the impact crater formation process that produces the strange internal structures that characterize complex craters.
		His research group hopes to use this model for the generation of the peak-ring at Chicxulub to further their understandings of the geology of other cratered planets and satellites, such as Mercury, Venus and the Moon.
	www.eurekalert.org /pub_releases/2000-11/ICoS-Cmon-1311100.php (965 words)

	Earth Change News on Earth Changes TV on the Web
		A tourist in the jungle outside Chicxulub, about 200 miles (322 kilometers) west of Cancun, wouldn't see any evidence of the crater, now buried in eons of sediment.
		The animation of the Chicxulub event shows how the whole thing might have happened, right up to the part where the ring mysteriously solidifies, like terrestrial Jell-O in some standard crater mold.
		The Chicxulub impact is widely believed to have triggered a mass dinosaur die-off, either through a global firestorm or through massive long-term environmental changes.
	www.earthchangestv.com /breaking/November2000/1123chicxulub.htm (491 words)

	Dinosaur Extinction:The Cause Behind the Effect (Site not responding. Last check: 2007-10-21)
		The claim was that this 180 kilometer crater was the impact scar left by an asteroid that collided with the earth.
		This impact crater is noticeably quite larger than Chicxulub; it is entirely possible that it was more directly responsible for the mass extinction.
		However, in light of recent evidence which proves that the Chicxulub crater was formed 300,000 years prior to the extinction, it is unlikely that the asteroid which caused it was indeed the sole cause of extinction.
	www.priweb.org /ed/ICTHOL/ICTHOL04papers/12.htm (1218 words)

	Chicxulub Crater (Site not responding. Last check: 2007-10-21)
		The outline of the 112-mile-wide (180-kilometer-wide) crater doesn’t stand out all that prominently, even in the new view that was released Thursday.
		The globe-girdling geologic signature of the blast was first noted in 1980, but it took years longer to identify Chicxulub crater as the likely epicenter.
		University of Calgary geologist Alan Hildebrand, who was involved in the earlier gravity mapping of the crater, said the radar view supported what he and his colleagues saw in the 1990s.
	meteorite.org /chicx_space.htm (673 words)

	Modeling an Asteroid Impact, Did It Kill the Dinosaurs? \| Spring 2003 \| Los Alamos National Laboratory
		The turbulent material inside this curtain is still being accelerated by the explosion from the craterÕs excavation.
		Two minutes after impact, the debris curtain has separated from the rim of the still-forming crater as debris in the curtain falls to Earth.
		Cores that have been obtained around the Chicxulub impact site are consistent with a southerly direction for the impact.
	www.lanl.gov /quarterly/q_spring03/impact.shtml (338 words)

	The Chicxulub Crater (Site not responding. Last check: 2007-10-21)
		It was originally thought to be a crater from a comet, but in 1998, a small piece of asteroid about 2.5mm was found, ruling that suggestion out.
		The Chicxulub crater was discovered by physicist Luis Alvarez and his son Walter, a geologist, when they discovered a layer of clay in northern America that contained about a hundred times as much iridium as normal.
		The Chicxulub Crater is now buried by several hundred metres of sediment, hiding it from view.
	www.wa.gov.au /tiac/forum/2001/hocking/famous/Chix.htm (245 words)

	Chicxulub
		Birch, F.F.S. 1998 Gauss's theorem, mass deficiency at Chicxulub crater (Yucatan, Mexico), and the extinction of the dinosaurs.
		Koeberl, C. 1993 Chicxulub crater, Yucatan: Tektites, impact glasses, and the geochemistry of target rocks and breccias.
		Schultz, P.H. 1995 The trajectory and consequences of the Chicxulub impact (abstract).
	www.unb.ca /passc/ImpactDatabase/images/chicxulub.htm (6023 words)

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