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Topic: Rio Grande Rift

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	Rio Grande Rift - Wikipedia, the free encyclopedia
		In the late Oligocene Epoch regional tensional forces became dominant and rifting was initiated as the crust began tearing apart.
		However, the Jemez Mountains themselves are not primarily a feature of the rift; rather, the range on the west side of the graben corresponding to the Sangre de Cristos is the lower and less well-known Nacimiento Mountains.
		The Rio Grande follows the course of the rift from southern Colorado to El Paso; it starts a southeast course out of New Mexico at the pass between the Franklin Mountains and the Sierra Juarez, which ends at the Gulf of Mexico.
	en.wikipedia.org /wiki/Rio_Grande_Rift (513 words)

	Rio Grande - Wikipedia, the free encyclopedia
		Use of the water of the Rio Grande is regulated by the Rio Grande Compact, an interstate pact between Colorado, New Mexico and Texas; and a treaty between the United States and Mexico.
		The Rio Grande rises in high mountains and flows for much of its length at high elevation; El Paso is 1147 m (3762 feet) above sea level.
		In New Mexico the river flows through the Rio Grande Rift from one sediment-filled basin to another, cutting canyons between the basins and supporting a fragile bosque ecosystem in its floodplain.
	en.wikipedia.org /wiki/Rio_Grande (448 words)

	Rio Grande Valley Study
		Although the Rio Grande NAWQA study unit is delineated primarily along the surface-water drainage of the Rio Grande and its tributaries (fig.
		The basins in the Rio Grande rift contain a larger thickness of basin-fill deposits than the basins outside of the rift; however, the basins outside of the rift are hydrologically similar to the basins in the rift.
		The Rio Grande may be a source of recharge or an area of discharge depending on the river stage and the altitude of the water table.
	nm.water.usgs.gov /nawqa/sudescription.html (11829 words)

	Rift (geology) - Wikipedia, the free encyclopedia
		In geology, a rift is a place where the Earth's crust and lithosphere are being pulled apart.
		Rifts are distinct from Mid-ocean ridges, where new oceanic crust and lithosphere is created by seafloor spreading.
		Lake Baikal, the bottom of the lake is the deepest continental rift on the earth.
	en.wikipedia.org /wiki/Rift (255 words)

	Rio Grande Rift -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-08)
		In the late (From 40 million to 25 million years ago; appearance of sabertoothed cats) Oligocene Epoch regional tensional forces became dominant and rifting was initiated as the crust began tearing apart.
		The most active rifting and associated volcanism came to an end in the late (Approximately the last 63 million years) Cenozoic.
		The city of (The largest city in New Mexico; located in central New Mexico on the Rio Grande river) Albuquerque lies within the rift.
	www.absoluteastronomy.com /encyclopedia/r/ri/rio_grande_rift.htm (409 words)

	Geophysics of the Rio Grande Rift
		The Rio Grande Rift consists of a series of north-south asymmetrical basins that are oppositely hinged.
		The Rio Grande Rift is located along a north-trending zone of past deformation during the Paleozoic (Ancestral Rockies) and during the Tertiary (Laramide orogenies).
		The Jemez lineament represents the tertiary volcanics during rifting and is considered to follow past weaknesses in the lithosphere.
	www.colorado.edu /GeolSci/Resources/WUSTectonics/RGRift/RGR.htm (694 words)

	AllRefer.com - Rio Grande, river, United States and Mexico, United States (U.S. Physical Geography) - Encyclopedia
		The Rio Grande is an important source of internationally regulated irrigation, a use it has long been put to.
		Today, dams on the Rio Grande are used for irrigation, flood control, and regulation of the river flow.
		Near the mouth of the Rio Grande is the irrigation-dependent citrus-fruit and truck-farm region commonly called the Rio Grande Valley and developed principally in the 1920s.
	reference.allrefer.com /encyclopedia/R/RioGrndRUS.html (470 words)

	Rift (geology) - Open Encyclopedia (Site not responding. Last check: 2007-10-08)
		Rifts are located at divergent boundaries between two tectonic plates.
		Between oceanic plates the rifts occur as oceanic ridges and where these oceanic ridges intersect continental crust rift valleys result as the continent begins to split.
		The Reelfoot Rift, an ancient buried failed rift underlying the New Madrid Seismic Zone in the Mississippi embayment.
	www.open-encyclopedia.com /Rifting (160 words)

	Rio Grande
		The Rio Grande (called the Río Bravo or, more formally, the Río Bravo del Norte in Mexico) is a river that rises in the San Juan Mountains of Colorado, flows through the San Luis Valley, then south into New Mexico through Albuquerque and Las Cruces to El Paso, Texas, on the Mexican border.
		Use of the water of the Rio Grande is regulated by the Rio Grande Compact, an interstate compact between Colorado, New Mexico and Texas; and a treaty between the United States and Mexico.
		Anciently the Rio Grande terminated at the bottom of the Rio Grande Rift in Lake Cabeza de Baca.
	www.brainyencyclopedia.com /encyclopedia/r/ri/rio_grande.html (452 words)

	The Rio Grande Rift
		West of the rift the crust of the Colorado Plateau is approximately 45 kilometers thick; east of the rift the crust beneath the Great Plains is 50 kilometers thick; beneath the rift zone the crust is only 35 kilometers thick (Chapin and Cather, 1994).
		The onset of rifting coincided with a period of intense volcanism associated with the early rift basins – as is common in other rift valleys of the world.
		The Rio Grande rift first developed as a chain of closed basins or half grabens (trench-like features formed by down-dropped blocks of crustal rocks), which gradually filled with lava, ash flows, and sediments that washed in from nearby mountain ranges.
	home.att.net /~sgeoveatch/rio_grande_rift.htm (1766 words)

	Albuquerque's Environmental Story - Geology and Geological History
		This physiographic demarcation is formed by the Rio Grande Rift, a great fracture in the earth's surface which extends more than 450 miles from Leadville, Colo., to Las Cruces, N.M. The Rift was formed by down-dropping of a large block of the earth's crust, yielding an elongated trough bounded on either side by mountains.
		The rise of this immense fragment of the earth's crust is somewhat analogous to opening a trap door; the open door is marked by the gently sloping eastern side of the Sandias, whereas the hinge is found in the intensely crumpled rocks of the Cedar Crest area.
		The grand design is determined by the Rio Grand Rift, one of the most impressive rift zones on earth.
	www.cabq.gov /aes/s1geol.html (992 words)

	Rio Grande Rift
		The Rio Grande rift is one of the major late Cenozoic continental rifts, sharing most geophysical, geological, and geochemical characteristics with other rifts of the world.
		It is theorized that the Rio Grande rift is related to regional extension in the western United States, which began in the middle Cenozoic.
		The lineaments that connected the ends of staggered basins were subjected to "scissor-like" torque in the near surface rocks and to a transverse shear at depth, and these deeply-penetrating transverse structures have tended to leak magma and to be zones of high heat flow and geothermal activity (Chapin, 1979).
	www.emporia.edu /earthsci/student/tilton4/rgrift.html (1380 words)

	New Mexico State University professor heads study of the Rio Grande Rift
		To geoscientists, the Rio Grande Rift is one sign that the North American plate -- that part of the Earth on which this continent sits -- is breaking apart, Ni said.
		Active rifting is the result of a thermal upwelling of a deeper part of the mantle we call the asthenosphere.
		Passive rifting is a response of the area near the rift to forces acting on the boundary of the plate.
	nmsu.edu /General/ucomm/public_html/Releases/2001/July2001/ni_rel.html (799 words)

	Open_Report 81.html
		Included along its path are sections of the Gila and Salt rivers in Arizona, ENE trending basins west of the Rio Grande rift, and the course of the Canadian River in easternmost New Mexico and through the Texas Panhandle (Figure 3).
		North for a distance of ~ 500 km, the rift is primarily composed of four north-trending elongate basins in a right-stepping echelon pattern.
		Westward from the Rio Grande rift along the track of the topographic lineation for at least 160 km are mapped normal faults with ENE and NE strikes (Figure 6).
	www.ees.nmt.edu /Geop/nmquakes/R81/R81.HTM (1841 words)

	Rio Grande Rift (Site not responding. Last check: 2007-10-08)
		The Rio Grande river runs a north-south course in Mexico and Colorado along the Rio Grande rift.
		Rio Grande Rift: Northern New Mexico, New Mexico Geological Society Thirty-Fifth Annual Field Conference October 11-13, 1984
		Geologic Map of the Rio Grande Rift and Southeastern Colorado Plateau, New Mexico, and Arizona
	www.freeglossary.com /Rio_Grande_Rift (373 words)

	Rio Grande Rift Online Research :: Information about Rio Grande Rift (Site not responding. Last check: 2007-10-08)
		The rifting involves a pure-shear rifting mechanism, in which both sides of the rift pull apart evenly and slowly, with the crust stretching like taffy rather than fracturing.[1][2][3]
		The Sangre de Cristo Mountains Range lies to the east of the north portion of the rift.
		The city of Albuquerque, New Mexico lies within the rift.
	in-northcarolina.com /search/Rio_Grande_Rift.html (499 words)

	Open File Report 93
		The outline of a small by active seismogenic province in the central Rio Grande rift near Socorro, the SSA, is apparent but not recognized as such because of the short recording period.
		Among the many important features of the rift’s shallow and deep structure revealed by the study is a very strong complex reflector corresponding in depth to the upper surface of the magma body inferred from SzP to SzS reflection phases on microearthquake seismograms.
		The Rio Grande rift near Socorro appears to be one of a few areas within continental rifts worldwide where a suite of geophysical observations indicates the existence of a thin magma chamber in the crust.
	www.ees.nmt.edu /Geop/nmquakes/R93/R93.HTM (8524 words)

	GO 568 Rio Grande Rift system
		The Rio Grande Rift system is a series of grabens (fault-bounded basins) that extend from central Colorado southward through New Mexico and into western Texas and Mexico.
		Gold mineralization was associated with explosive volcanic eruptions during the mid-Tertiary, possibly in connection with Rio Grande rifting, widespread volcanism, and hydrothermal metamorphism.
		The Rio Grande rift in Colorado and New Mexico.
	academic.emporia.edu /aberjame/struc_geo/rio/rio.htm (756 words)

	NMBGMR Staff - Richard Chamberlin - Pliocene and Pleistocene displacement history of the Socorro Canyon Fault, Central ...
		The oldest Quaternary surface is capped by a stage IV laminar calcrete that projects 98 m above the Rio Grande.
		Available map data, however, indicate the most probable scenario is one of the constant rifting (in Plio-Pleistocene time) associated with nonuniform partitioning of strain within the adjacent four strands (splays) of the SCF.
		Three strands of the SCF that lie west of the "main" trace show a cumulative post 4.1 Ma displacement of approximately 162 m, which adequately compensates for the "missing" 144 m of Pliocene displacement that should be present on the main trace (projecting present rate backward over long term).
	geoinfo.nmt.edu /staff/chamberlin/abstracts/absscfault.html (485 words)

	Don Schultz's CU
		By beginning with the immediate environment, the Rio Grande Valley and the Sandia Mountains with encouraging questions concerning them and their existence it is hoped that student engagement will be initiated and held.
		The most perplexing issue in evaluating seismic hazards in the Rio Grande Rift, as has been noted by others, is the difference between the predicted frequency of the large magnitude earthquakes based on historic record versus the paleoseismic record.
		Either the historical seismicity is reflecting a temporary period of quiescence in the rift or the current rate of extensional deformation across the rift is not as high as indicated by long- term estimates of the fault slip rates” (1).
	www.unm.edu /~abqteach/geology/02-03-09.htm (5113 words)

	rio grande rift
		On the west side of the rift, the uplifted elements are the Nacimiento mountains, the Mt.
		We have discussed that "our" Rift is of continental magnitude and consists mainly of small to moderate faults aligned in a generally parallel pattern and separated by a few to 30 or more miles.
		Chalchihuitl, near Cerrillos, New Mexico, on the eastern edge of the Rio Grande Rift, is perhaps the most famous of all of the Native American mines.
	www.agmc.info /rio%20grande%20rift.htm (3127 words)

	Rio Grande Rift: Definition and Links by Encyclopedian.com - All about Rio Grande Rift
		Rio Grande Rift: Definition and Links by Encyclopedian.com - All about Rio Grande Rift
		The area is presently quiescent, but significant geologial activity has occurred in the area over the last 20 million years.
		The Rio Grande river follows the course of the rift from southern Colorado to El Paso.
	www.encyclopedian.com /ri/Rio-Grande-Rift.html (124 words)

	[No title]
		An incipient Rio Grande rift began in the Abiquiu embayment between 10 and 7 Ma.
		The western Rio Grande rift boundary jumped east to the Embudo fault zone, decoupling the embayment from the rift.
		Deepening of the Rio Grande rift occurred primarily during the late Miocene and Pliocene in the Espanola and San Luis Basins.
	www.clas.ufl.edu /users/pciesiel/gly3150/rio_grande_rift.html (661 words)

	Stratigraphic Chart and Paleogeographic Maps for the Rio Grande Rift in Northern New Mexico
		The Rio Embudo is marked by the distribution of the Cejita Member of the Tesuque Formation.
		A coarse-gravel train marking the ancestral Rio Chama and an early Rio Grande in the west-central Española basin is clearly recognized in the southeastern Jemez Mountains prior to 7 Ma, and may have been established by the time of the pictured reconstruction.
		Ancestral Rio Grande gravel, mostly fed from the Rio Chama watershed, interfingers with Jemez-derived volcaniclastic fans near Los Alamos, and continues southward into the Santo Domingo basin.
	epswww.unm.edu /facstaff/gsmith/research/maps.htm (1168 words)

	Rio Grande Rift (RGR) (Site not responding. Last check: 2007-10-08)
		The resulting fast SKS polarization directions are NNE, i.e., parallel or subparallel to the rift axis (Figure 10 and Table 1c).
		The splitting time was found to range from 0.9 to 1.5 s; no measurements were made on the flanks of the rift zone.
		West of the rift, in California and Nevada, the dominant fast direction is east-west [e.g., Vinnik et al.
	earth.geol.ksu.edu /sgao/publications/jgr97/node7.html (130 words)

	WESTWARD MIGRATING IGNIMBRITE CALDERAS AND A LARGE RADIATING MAFIC DIKE SWARM OF OLIGOCENE AGE, CENTRAL RIO GRANDE ... (Site not responding. Last check: 2007-10-08)
		A cluster of five large overlapping ignimbrite calderas is moderately well exposed in strongly extended tilted fault-block mountain ranges of the central Rio Grande rift, southwest of Socorro NM.
		It parallels the southeastern flank of the Colorado Plateau and the WSW-trending San Agustin arm of the rift.
		Ar ages of sanidines from the rhyolite ignimbrites demonstrate that the distended calderas become progressively younger to the west-southwest.
	gsa.confex.com /gsa/2002AM/finalprogram/abstract_43856.htm (504 words)

	Rio Grande Rift Encyclopedia Article, Definition, History, Biography (Site not responding. Last check: 2007-10-08)
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	www.thelocalcolorartgallery.com /encyclopedia/Rio_Grande_Rift (711 words)

	UNM Today: Researchers from UNM, CU awarded NSF grant to study stretching of Rio Grande Rift
		The Rio Grande rift is the easternmost deforming province within the tectonically active western margin of North America.
		The rift is undergoing stretching and extension manifested by higher probabilities of earthquake occurrence than in surrounding regions.
		A workshop for in-service teachers in New Mexico is planned as part of the NSF-funded Rio Grande GPS study (jointly by Roy and Dr. Matthew Nyman of the Dept. of Earth and Planetary Sciences at UNM).
	www.unm.edu /%7Emarket/cgi-bin/archives/000805.html (771 words)

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