Alamo Breccia

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Series: Geological Society, London, Special Publications
Published: 01 January 2013
DOI: 10.1144/SP371.8
EISBN: 9781862396340
... was difficult to justify and the component was interpreted as more likely being Cenozoic Era in age despite the normal polarity. Gillett & Karlin (2004) interpreted the intermediate component to be polygenic in origin and probably reflected local Cenozoic Era or Mesozoic Era events. The Alamo Breccia...
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Series: GSA Special Papers
Published: 01 January 2002
DOI: 10.1130/0-8137-2356-6.489
Journal Article
Journal: Geology
Published: 01 November 1995
Geology (1995) 23 (11): 1003-1006.
...Hugues Leroux; John E. Warme; Jean-Claude Doukhan Abstract A transmission electron microscope (TEM) study of quartz grains strongly implies that the Alamo breccia of southern Nevada resulted indirectly from a Late Devonian hypervelocity impact event. The Alamo breccia is perhaps the most voluminous...
Journal Article
Journal: Geosphere
Published: 01 February 2015
Geosphere (2015) 11 (1): 123-143.
...Andrew J. Retzler; Andrew J. Retzler; Leif Tapanila; Julia R. Steenberg; Carrie J. Johnson; Reed A. Myers Abstract Marine facies of carbonate and siliciclastic sediments deposited on top of the upper Devonian Alamo Breccia Member identify the shape and size of the Alamo impact crater in south...
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Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2008.2437(07)
.... The Alamo Event occurred in a marine setting. The target was mainly a thick interval of Paleozoic carbonate rocks that were redistributed as complex Alamo Breccia facies. These facies occur singly or combined in six genetic “Realms” that are introduced and explained herein (Fig. 2) . Thus far only one...
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Series: GSA Special Papers
Published: 01 October 2015
DOI: 10.1130/2015.2517(02)
... of the eastward-traveled outer crater rim created by the ca. 382 Ma (early Late Devonian, middle Frasnian) Alamo impact. The Alamo impact was produced by a 5-km-diameter bolide, most likely a comet, which excavated a transient submarine crater 44–65 km in diameter. Comparison of thin (8–12 m) Alamo Breccia...
Series: Society for Sedimentary Geology
Publisher: Society for Sedimentary Geology
Published: 01 January 2017
DOI: 10.2110/sepmsp.107.11
EISBN: 9781565763456
..., Sequence 3 contains a major disconformity at the base of the Alamo breccia that omits significant thicknesses of preexisting platform carbonates. Sequence 4 records postimpact sedimentation trends, including condensed sections at downdip western localities (within crater) and shallow subtidal to peritidal...
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Series: GSA Field Guide
Published: 01 January 2008
DOI: 10.1130/2008.fld011(10)
EISBN: 9780813756110
... Figure 9. Alamo Breccia locality map showing genetic Breccia Realms, Nevada and western Utah. Lateral Breccia Zones 1, 2, and 3 of earlier publications (e.g., Warme and Sandberg, 1995 , 1996 ; Warme and Kuehner, 1998 ) are now equated with the Rim, Ring, and Runup Realms ( Warme and Pinto...
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Series: GSA Special Papers
Published: 01 January 2005
DOI: 10.1130/0-8137-2384-1.259
... through multiple converging lines of geological and paleontological evidence. Previous and new evidence includes the catastrophically emplaced Alamo Breccia, tsunamites, shock-metamorphosed quartz grains, carbonate accretionary lapilli, an iridium anomaly, sub-Breccia clastic injection, deep-water Breccia...
Journal Article
Journal: GSA Bulletin
Published: 01 November 2006
GSA Bulletin (2006) 118 (11-12): 1313-1330.
..., although wind erosion has smoothed some features. Some large blocks are composed of agglutinate or basalt breccia. Bradshaw and Smith (1994 , p. 168) stated that at Red Cone volcano “cinder mounds typically occur at the tail-end of individual flows, and thus represent actual vent sites.” However, because...
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Series: GSA Field Guides
Published: 04 September 2019
DOI: 10.1130/2019.0055(08)
EISBN: 9780813756544
... ABSTRACT This field trip highlights evidence of late Pliocene–early Pleistocene submarine and subaerial volcanism coeval with marine and marginal-marine sedimentation in the Santa Rosalía Basin in Baja California. The best exposures of these rocks occur at the El Álamo Canyon, which exhibits...
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Journal Article
Journal: Geosphere
Published: 01 June 2009
Geosphere (2009) 5 (3): 252-269.
... or the region. The Rendija Canyon fault (RCF) is a dominantly down-to-the-west normal fault that, along with the down-to-the-east PF, bounds the Diamond Drive graben ( Fig. 3 ; Gardner et al., 1999 ). The graben trends north and is beneath the western part of Los Alamos. The 14-km-long RCF is located ~3...
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Journal Article
Journal: Geology
Published: 01 August 1987
Geology (1987) 15 (8): 748-752.
... Springs, in the western ring-fracture zone of the Valles caldera, New Mexico. This mineralization is hosted by fractured, quartz-sericitized, intracaldera ash-flow tuffs younger than 1.12 Ma. The molybdenite is an unusual, poorly crystalline variety that occurs in vuggy veinlets and breccia cements also...
Journal Article
Published: 01 January 2006
Reviews in Mineralogy and Geochemistry (2006) 60 (1): 83-219.
... to 1.7 ϕ) than impact-produced soils. The lunar regolith consists of fragments of igneous intrusive and extrusive rocks, crystalline impact-melt rocks that texturally resemble igneous rocks, various types of crystalline and glassy breccias produced by meteoroid impacts, mineral grains derived from...
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Journal Article
Journal: Geology
Published: 01 March 2001
Geology (2001) 29 (3): 255-258.
... sequence. The first phase was dominated by basaltic andesite, andesite breccias, and minor lava flows (∼52%–60% SiO 2 ), and minor volumes of intercalated rhyolite, dacite flows, and pyroclastic deposits; products of this first phase are thickest on the northern half of the volcano. A second, less...
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Journal Article
Published: 01 August 2005
Vadose Zone Journal (2005) 4 (3): 620-636.
... on the plateau ( Robinson et al., 2005b ; Broxton and Vaniman, 2005 ) and is often located beneath the larger wet canyons and within the more porous, breccia zones in basalt. An example of perched water in basalt occurs at Well R-9 in lower Los Alamos Canyon ( Fig. 1 ), where groundwater was found from 55 to 70...
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Journal Article
Journal: Geology
Published: 01 August 2005
Geology (2005) 33 (8): 629-632.
.... These blocks are mainly composed of welded fragments of relatively dense, angular basalt breccia and agglutinate, and probably resulted from a late-stage steam explosion that disrupted and ejected part of a solidified conduit plug. The lower, early cone facies exhibits characteristics...
Journal Article
Journal: Lithosphere
Published: 01 October 2011
Lithosphere (2011) 3 (5): 328-345.
... sections of multiple cooling units at Cat Mesa, Eagle Canyon, San Juan Mesa, and Seven Springs, as well as from individual cooling units at Los Alamos Canyon, Dome Road, Mortandad Canyon, Pajarito Mesa, Peralta Canyon, San Antonio Canyon, Sawyer Mesa, upper Sandia Canyon, Vallecitos, and Young Ranch ( Fig...
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Journal Article
Journal: Geology
Published: 01 August 1991
Geology (1991) 19 (8): 776-779.
..., suggesting a temporary reduction of surface-water biomass. A widely distributed (over at least several hundred kilometres) limestone breccia unit of possible wave-deposit origin is present directly below the boundary in south China. Enrichments of Al, V, Cr, As, and U, and a dip in the Mn abundance...
Journal Article
Published: 01 August 2005
Vadose Zone Journal (2005) 4 (3): 637-652.
... in this zone. Los Alamos Canyon R-9i
 98 m (322 ft)
 1946 m (6383 ft)
 86 m (281.5 ft)
 1922 m (6305 ft) 42 m (137 ft) 14–30 m
   (45–99 ft) Cerros del Rio basalt
   interflow breccia and
   highly fractured
   basalt massive basalt with
   few fractures tritium Groundwater was first...
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