USGS Visual Identifier

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Geologic Unit: Leach Canyon

Publication:
Mackin, J.H., 1960, Structural significance of Tertiary volcanic 
   rocks in southwestern Utah: American Journal of Science, v. 
   258, no. 2, p. 81-131.
Usage in Publication:
Leach Canyon tuff [member]

Modifications: Geologic Province: Dominant Lithology:
 Named
 Great Basin province
 Tuff

Summary:
Named as the basal unit [member] and one of four units [members] of the Quichapa formation (reduced in rank from group) for exposures on south side of Leach Canyon, Desert Mount quad, Iron Co, UT in Great Basin province. These exposures designated the type locality. Is a single depositional unit 450-500 ft thick. Consists of a matrix with the texture of unglazed porcelain gray to flesh-colored, enclosing fragments of dark red felsite, gray pumice, crystals of quartz, feldspar, biotite, and other pyrogenic minerals. Fragments make up as much as 10 percent of the rock, and pyrogenic minerals make up 15 to 25 percent. No alignment of fragments and mineral grains. Pumice lenticules are shapeless. Gradual decrease in number and size of rock fragments, and in degree of induration in the upper 50 to 75 ft. Locally upper few ft consists of distinctly bedded tuff rich in pumice; the tuff is probably an air-fall ash. Is younger than Isom formation (new) and older than Swett tuff [member] of Quichapa. Is of Oligocene to Miocene age.
Source: GNU records (USGS DDS-6; Denver GNULEX).


Publication:
Cook, E.F., 1960, Geologic atlas of Utah, Washington County: 
   Utah Geological and Mineral Survey Bulletin, no. 70, 119 p.
Usage in Publication:
Leach Canyon tuff

Modifications: Geologic Province: Dominant Lithology:
 Overview
 Great Basin province
 

Summary:
Is the basal unranked unit--also called "lowermost member" [but the rank term member not used in the text with place name Leach Canyon] --of the Quichapa formation. Underlies Leach Canyon tuff, an unranked unit in the Quichapa. Composed of strongly welded vitric quartz-latitic or rhyolitic tuff about 180 ft thick. Has a basal black glass zone 10 to 20 ft thick. Color gradation upward in the Leach Canyon into pale purple. Crystals of sanidine and plagioclase, in equal proportion, and sparse biotite set in lithoidal to glassy groundmass. Stratigraphic table. Tertiary age. Mapped within Quichapa formation on several geologic maps in Washington Co., UT in the Great Basin province.
Source: GNU records (USGS DDS-6; Denver GNULEX).


Publication:
Cook, E.F., 1965, Stratigraphy of Tertiary volcanic rocks in 
   eastern Nevada: Nevada Bureau of Mines and Geology Report, 
   no. 11, 67 p., (incl. geologic map, scale 1:500,000)
Usage in Publication:
Leach Canyon Tuff

Modifications: Geologic Province: Dominant Lithology:
 Areal limits
 Revised
 Great Basin province
 

Summary:
Unit is raised to formation rank. In the Pahroc and Hiko Ranges consists of at least three ignimbrites. Well exposed in Condor Canyon, near Ursine, in Black Canyon, and in White River Narrows, NV. Leach Canyon covers 5000 to 7000 sq mi (NV and UT); estimated volume is over 500 cu mi.
Source: GNU records (USGS DDS-6; Menlo GNULEX).


Publication:
Averitt, Paul, 1967, Geologic map of the Kanarraville quadrangle, 
   Iron County, Utah: U.S. Geological Survey Geologic Quadrangle 
   Map, GQ-694, 1 sheet, scale 1:24,000 [http://ngmdb.usgs.gov/
   Prodesc/proddesc_2002.htm]
Usage in Publication:
Leach Canyon Tuff Member*

Modifications: Geologic Province: Dominant Lithology:
 Adopted
 Age modified
 Great Basin province
 

Summary:
Leach Canyon Tuff Member of the Quichapa Formation of Mackin (1960) is adopted. Named for exposures in south side of Leach Canyon, southern part of T36S R13W, Desert Mound 7.5' quad, Iron Co., UT, designated type locality. Age is Oligocene or Miocene. [no basis given for age assignment]
Source: GNU records (USGS DDS-6; Menlo GNULEX).


Publication:
Averitt, Paul, and Threet, R.L., 1973, Geologic map of the Cedar 
   City quadrangle, Iron County, Utah: U.S. Geological Survey 
   Geologic Quadrangle Map, GQ-1120, 1 sheet, scale 1:24,000 
   [http://ngmdb.usgs.gov/Prodesc/proddesc_10661.htm]
Usage in Publication:
Leach Canyon Tuff Member*

Modifications: Geologic Province: Dominant Lithology:
 Isotopic dating
 Age modified
 Great Basin province
 

Summary:
Age of the Leach Canyon Tuff Member is early Miocene based on isotopic (K-Ar) age determinations of 24.0 +/-0.5 to 22.3 +/-0.5 Ma by Armstrong (1970). Shown as small outcrop on geologic map of Cedar City 7.5' quad, Iron Co, UT in sec. 24-25 T35S R11W.
Source: GNU records (USGS DDS-6; Menlo GNULEX).


Publication:
Anderson, J.J., and Rowley, P.D., 1975, Cenozoic stratigraphy 
   of southwestern high plateaus of Utah, IN Cenozoic geology 
   of southwestern high plateaus of Utah: Geological Society of 
   America Special Paper, 160, p. 1-51.
Usage in Publication:
Leach Canyon Formation*

Modifications: Geologic Province: Dominant Lithology:
 Revised
 Overview
 Great Basin province
 

Summary:
Is the basal formation of the Quichapa Group. This is the first published paper to describe the Narrows (base) and Table Butte (top) Tuff Members. Both members were named by Williams (1967) in an unpublished thesis. Both members consist of white, pale-salmon, or brown welded to partially welded ash-flow tuff with conspicuous lithic fragments and abundant quartz crystals. The members are separated by an unnamed pale-green sandstone that is also assigned to the Leach Canyon in the Black Mountains. The Narrows has an areal extent of at least 25,000 sq km from east of Parowan on the Markagunt Plateau, Iron Co, UT to the Seaman and Delmar Ranges of NV, in the Great Basin province. Table Butte is exposed in the Red Hills, Bald Hills, and southeast Black Mountains, Iron Co, UT in the Great Basin province. Leach Canyon is younger than Hole-in-the-Wall Tuff Member of the Isom Formation and is separated from the Condor Canyon Formation, middle formation of the Quichapa by the Bear Valley Formation which is not part of the Quichapa. Correlation chart; block diagram. K-Ar dates of 22.3 m.y. on sanidine and 24.0 m.y. on biotite reported by Armstrong (1970) on sample of Narrows from Brian Head. Miocene age assigned. History of usage included.
Source: GNU records (USGS DDS-6; Denver GNULEX).


Publication:
Mackin, J.H., and Rowley, P.D., 1975, Geologic map of the Avon 
   SE quadrangle, Iron County, Utah: U.S. Geological Survey 
   Geologic Quadrangle Map, GQ-1294, 1 sheet, scale 1:24,000 
   [http://ngmdb.usgs.gov/Prodesc/proddesc_10829.htm]
Usage in Publication:
Leach Canyon Formation*

Modifications: Geologic Province: Dominant Lithology:
 Areal limits
 Great Basin province
 

Summary:
Leach Canyon Formation is geographically extended to the northern Antelope Range, Iron Co., UT. Age is Miocene.
Source: GNU records (USGS DDS-6; Menlo GNULEX).


Publication:
Moring, Barry, 1987, Geologic map of the South Pahroc Range, 
   Lincoln County, Nevada: U.S. Geological Survey Miscellaneous 
   Field Studies Map, MF-1917, 1 sheet, scale 1:48,000
Usage in Publication:
Leach Canyon Formation*

Modifications: Geologic Province: Dominant Lithology:
 Areal limits
 Great Basin province
 

Summary:
Leach Canyon Formation geographically extended to east side of South Pahroc Range from about a mi south of Mackie perlite mine to near south edge of range. Described as poorly welded, white to light-tan ash-flow tuff approximately 400 ft thick. Age given as Miocene based on isotopic ages of 24 to 22 Ma (Ekren and others, 1977).
Source: GNU records (USGS DDS-6; Menlo GNULEX).


Publication:
Pampeyan, E.H., Black, H.R., Jr., and Campbell, H.W., 1988, 
   Mineral resources of the Meadow Valley Range Wilderness Study 
   Area, Lincoln and Clark Counties, Nevada, IN Mineral resources 
   of wilderness study areas; southeastern Nevada: U.S. Geological 
   Survey Bulletin, 1729-C, p. C1-C24.
Usage in Publication:
Leach Canyon Formation*

Modifications: Geologic Province: Dominant Lithology:
 Areal limits
 Great Basin province
 

Summary:
Leach Canyon Formation extended into Meadow Valley Mountains, Lincoln Co., NV. [no age given]
Source: GNU records (USGS DDS-6; Menlo GNULEX).


Publication:
Siders, M.A., Rowley, P.D., Shubat, M.A., Christenson, G.E., 
   and Galyardt, G.L., 1990, Geologic map of the Newcastle 
   quadrangle, Iron County, Utah: U.S. Geological Survey Geologic 
   Quadrangle Map, GQ-1690, 1 sheet, scale 1:24,000, Supersedes 
   U.S. Geological Survey Open-File Report OF-89-449. [http://
   ngmdb.usgs.gov/Prodesc/proddesc_1200.htm]
Usage in Publication:
Leach Canyon Formation*

Modifications: Geologic Province: Dominant Lithology:
 Age modified
 Overview
 Great Basin province
 

Summary:
Is basal formation (of 3) of Quichapa Group. Mapped east of Antelope Range fault zone in southern Antelope Range, southern and southeastern part of quad, Iron Co, UT (Great Basin province). Younger than Isom Formation (Oligocene); older than Condor Canyon Formation (Miocene) of Quichapa Group. Map unit described soft to moderately resistant, pink, tan, light-purple, reddish-brown, light-gray, poorly to moderately welded, crystal-poor, rhyodacitic ash-flow tuff. Contains abundant light-gray and tan cognate pumice as long as 5 cm and distinctive, mostly red or reddish-brown, subangular lithic clasts as much as 6 cm in diameter but generally <1 cm diameter. Comprises several compound cooling units (not mapped separately); upper and less welded units belong to Table Butte Tuff Member; lower and more welded units belong to Narrows Tuff Member. Consists of 10-20% phenocrysts of plagioclase, quartz, and sanidine, and minor biotite, Fe-Ti oxides, and hornblende in groundmass of mostly devitrified shards. Isopach maps suggest source in Caliente caldera complex (Williams, 1967). Average isotopic age 24.7 Ma based on three K-Ar ages (recalculated using IUGS decay constants) on biotite, sanidine, and plagioclase by Armstrong (1970), but is significant variation in ages (22.9-26.7 Ma). Age modified from Miocene to Oligocene based on recalculation of radiometric dates and using Miocene-Oligocene boundary. Incomplete section about 160 m thick.
Source: GNU records (USGS DDS-6; Denver GNULEX).


Publication:
Jayko, A.S., 1990, Shallow crustal deformation in the Pahranagat 
   area, southern Nevada, IN Wernicke, B.P., ed., Basin and 
   Range extensional tectonics near the latitude of Las Vegas, 
   Nevada: Geological Society of America Memoir, 176, p. 
   213-236.
Usage in Publication:
Leach Canyon Formation*

Modifications: Geologic Province: Dominant Lithology:
 Areal limits
 Age modified
 Great Basin province
 

Summary:
Unit geographically extended into report area [Pahranagat Range]. Age shown as Miocene and (or) Oligocene here.
Source: GNU records (USGS DDS-6; Menlo GNULEX).


Publication:
Hurtubise, D.O., and du Bray, E.A., 1992, Stratigraphy and 
   structure of the Seaman Range and Fox Mountain, Lincoln and 
   Nye Counties, Nevada, IN Evolution of sedimentary basins; 
   eastern Great Basin: U.S. Geological Survey Bulletin, 1988-B, 
   p. B1-B31.
Usage in Publication:
Leach Canyon Formation*

Modifications: Geologic Province: Dominant Lithology:
 Areal limits
 Isotopic dating
 Great Basin province
 

Summary:
Leach Canyon Formation geographically extended into Seaman Range, Lincoln and Nye Co., NV. Radiometric age given as about 24.6 Ma.
Source: GNU records (USGS DDS-6; Menlo GNULEX).


Publication:
Maldonado, Florian, and Williams, V.S., 1993, Geologic map of 
   the Paragonah quadrangle, Iron County, Utah: U.S. Geological 
   Survey Geologic Quadrangle Map, GQ-1713, 1 sheet, scale 
   1:24,000 [http://ngmdb.usgs.gov/Prodesc/proddesc_1218.htm]
Usage in Publication:
Leach Canyon Formation*

Modifications: Geologic Province: Dominant Lithology:
 Mapped 1:24k
 Great Basin province
 Tuff

Summary:
Mapped in northwest part of quad, Iron Co, UT, Great Basin province. [Also mapped in adjacent quad to west (Parowan Gap, USGS GQ-1712) where it underlies Bauers Tuff Member of Condor Canyon Formation of Quichapa Group.] Is only formation of Quichapa Group present in quad. Consists of moderately resistant to resistant, white to grayish-orange-pink, rhyolitic, partly to moderately welded ash-flow tuff; contains phenocrysts that include plagioclase, quartz, sanidine, biotite. Characterized by high content of predominantly red lithic fragments. Typically erodes to hoodoos. May include Narrows Tuff and Table Butte Tuff Members. Correlates in part with Bear Valley Formation; older than Baldhills Tuff Member of Isom Formation; younger than Mount Dutton Formation. Maximum exposed thickness is about 120 m. Assigned age is Oligocene based on average K-Ar age of 24.7 (Armstrong, 1970, Geochimica Cosmo. Acta, v. 34, p. 203-232).
Source: GNU records (USGS DDS-6; Denver GNULEX).


Publication:
Swadley, W.C., and Simonds, F.W., 1994, Geologic map of the 
   Pahroc Spring NE quadrangle, Lincoln County, Nevada: U.S. 
   Geological Survey Geologic Quadrangle Map, GQ-1746, 1 sheet, 
   scale 1:24,000
Usage in Publication:
Leach Canyon Formation*

Modifications: Geologic Province: Dominant Lithology:
 Age modified
 Areal limits
 Great Basin province
 

Summary:
Leach Canyon Formation is geographically extended into the report area. Age is everywhere revised from Oligocene and Miocene(?) to Oligocene based on isotopic (K-Ar) ages.
Source: GNU records (USGS DDS-6; Menlo GNULEX).


Publication:
Rowley, P.D., Shroba, R.R., Simonds, F.W., Burke, K.J., Axen, 
   G.J., and Olmore, S.D., 1994, Geologic map of the Chief 
   Mountain quadrangle, Lincoln County, Nevada: U.S. Geological 
   Survey Geologic Quadrangle Map, GQ-1731, 1 sheet, scale 
   1:24,000 [http://ngmdb.usgs.gov/Prodesc/proddesc_11017.htm]
Usage in Publication:
Leach Canyon Formation*

Modifications: Geologic Province: Dominant Lithology:
 Age modified
 Areal limits
 Great Basin province
 

Summary:
Leach Canyon Formation is extended into the southern Chief Range, Lincoln Co, NV. Age (local) is Oligocene and Miocene(?).
Source: GNU records (USGS DDS-6; Menlo GNULEX).


Publication:
Hintze, L.F., and Axen, G.J., 1995, Geologic map of the Scarecrow 
   Peak Quadrangle, Washington County, Utah and Lincoln Co, 
   Nevada: U.S. Geological Survey Geologic Quadrangle Map, 
   GQ-1759, 1 sheet, scale 1:24,000 [http://ngmdb.usgs.gov/
   Prodesc/proddesc_307.htm]
Usage in Publication:
Leach Canyon Formation*

Modifications: Geologic Province: Dominant Lithology:
 Overview
 Great Basin province
 

Summary:
Mapped in southwest part of quad where it is exposed only in sec 30, T9S, R71 E., Lincoln Co, NV, Great Basin province. Is lower of two formations of Quichapa Group in study area (other is Harmony Hills Tuff). Consists of grayish-pink, poorly welded, crystal-poor rhyolite ash-flow tuff; contains light gray, cognate pumic fragments less than 1 cm long and few red lithic clasts of similar size. Small phenocrysts make up about 15% of rock. Unconformably overlies Kayenta Formation; underlies Oligocene or Miocene andesite. Unit is 6 m thick. Cite an age of 24.7 Ma (Oligocene) after Rowley and Shroba (1991, USGS GQ-1701).
Source: GNU records (USGS DDS-6; Denver GNULEX).


Publication:
Jayko, A.S., in press, Pahranagat Range 1 degrees x 30-minute 
   quadrangle, Lincoln and Nye Counties, Nevada: Nevada Bureau 
   of Mines and Geology Bulletin, __.
Usage in Publication:
Leach Canyon Formation*

Modifications: Geologic Province: Dominant Lithology:
 Age modified
 Great Basin province
 

Summary:
Leach Canyon Formation age revised (overall) from Miocene to: Oligocene(?) and Miocene based on stratigraphic relations (and age data from other areas). Age in area of report (Pahranagat Range) is given as Oligocene and (or) Miocene.
Source: GNU records (USGS DDS-6; Menlo GNULEX).