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Otowi Member

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Geochemical variation in the (A) <b>Otowi</b> <b>Member</b> and (B) Tshirege <b>Member</b>. SiO ...
Published: 01 October 2011
Figure 5. Geochemical variation in the (A) Otowi Member and (B) Tshirege Member. SiO 2 versus TiO 2 (left) and Rb versus Nb (right). Data for Qbo in A are from Gardner et al. (1999) . Data for Qbt1, Qbt2, and Qbt3 in B are from Broxton et al. (1995 , 1996 ); Stimac et al. (1996
Series: GSA Special Papers
Published: 01 April 2013
DOI: 10.1130/2012.2494(12)
... ignimbrites (ca. 1.87–1.84 Ma); (5) the Otowi Member of the Bandelier Tuff, including the basal Guaje Pumice Bed (both ca. 1.68–1.61 Ma); (6) the Cerro Toledo Rhyolite (ca. 1.59–1.22 Ma); (7) the Tshirege Member of the Bandelier Tuff, including the basal Tsankawi Pumice Bed (both ca. 1.25–1.21 Ma); and (8...
Image
Equal-area projections of locality mean directions in the <b>Otowi</b> <b>Member</b>. (A)...
Published: 01 October 2011
Figure 9. Equal-area projections of locality mean directions in the Otowi Member. (A) All localities. (B) Localities north and south of the Jemez fault. (C) Localities east and west of the Pajarito fault. See Figure 4 for locations, Dec.—declination; Inc.—inclination.
Image
Structure contour and isopach map for the <b>Otowi</b> <b>Member</b> of the Bandelier Tuf...
Published: 01 August 2005
Fig. 16. Structure contour and isopach map for the Otowi Member of the Bandelier Tuff. Structure contours are for base of Guaje Pumice Bed and show the paleotopography before eruption of the Otowi Member. Otowi ash-flow tuffs filled a broad north-trending paleovalley bound by the Sierra de los
Journal Article
Journal: GSA Bulletin
Published: 01 January 1987
GSA Bulletin (1987) 98 (1): 66–76.
...DONALD B. POTTER; CHRISTA M. OBERTHAL Abstract The nonwelded ash-flow tuffs of the 1.4-m.y.-old lower (Otowi) member of the Bandelier Tuff on the flanks of the Jemez Mountains erupted from as many as seven ring-fracture vents bounding the large Toledo Caldera at the center of the volcanic complex...
Journal Article
Journal: Geology
Published: 01 June 1999
Geology (1999) 27 (6): 495–498.
...J. A. Wolff; F. C. Ramos; J. P. Davidson Abstract The 1.61 Ma Otowi Member of the Bandelier Tuff (Jemez Mountains volcanic field, New Mexico) is a caldera-forming high-silica rhyolitic ignimbrite with a precursor fallout deposit. The Otowi Member has high Rb/Sr ratios; the 87 Rb/ 86 Sr ratios from...
Journal Article
Journal: Geology
Published: 01 June 2003
Geology (2003) 31 (6): 533–536.
...J.A. Wolff; F.C. Ramos Abstract We report, for the first time, high-precision Pb isotope data from a high-silica rhyolite. Prior work on Sr isotopes in the 1.6 Ma Otowi Member of the Bandelier Tuff (Valles caldera, New Mexico) established that large 87 Sr/ 86 Sr variations exist among Otowi glasses...
FIGURES
Journal Article
Published: 01 October 1988
American Mineralogist (1988) 73 (9-10): 1025–1037.
...Charlotte M. Warshaw; Robert L. Smith Abstract Ferromagnesian silicates and magnetite are found throughout the Pleistocene Bandelier Tuff, Jemez Mountains, New Mexico. The upper (Tshirege) member of this rhyolitic ash-flow formation repeats the general type of sequence found in the lower (Otowi...
Journal Article
Journal: GSA Bulletin
Published: 01 December 1996
GSA Bulletin (1996) 108 (12): 1549–1566.
...Terry L. Spell; Ian McDougall; Anthony P. Doulgeris Abstract The Cerro Toledo Rhyolite comprises a group of domes and tephra which were erupted during the interval between two caldera-forming ignimbrites, the Tshirege Member and Otowi Member of the Bandelier Tuff, in the Jemez Volcanic Field, New...
Journal Article
Published: 01 August 2005
Vadose Zone Journal (2005) 4 (3): 453–465.
... in the subcanyon vadose zone. Mortandad Canyon, one of the drier canyons, has less clay alteration. Hydraulic property data for the Otowi Member of the Bandelier Tuff, one of the most widespread lithologies of the plateau, indicate that zones of high clay abundance have hydraulic transmissivities ( K sat ) one...
FIGURES | View All (6)
Journal Article
Published: 01 April 2021
American Mineralogist (2021) 106 (4): 620–632.
... zoned high-silica rhyolite Otowi (lower) Member of the Bandelier Tuff at ~1.60 Ma, which formed a caldera now largely overprinted by the later eruption ( Goff et al. 2011 , 2014 ; Wolff and Ramos 2014 ). During the ~340 000 years interval between the two caldera-forming events, several minor eruptions...
FIGURES | View All (7)
Image
Structure contour and isopach map for the Cerro Toledo interval. Structure ...
Published: 01 August 2005
Fig. 17. Structure contour and isopach map for the Cerro Toledo interval. Structure contours for base of unit indicate that Cerro Toledo filled a broad southeast-trending paleovalley incised into the Otowi Member (see isopach map for Otowi Member in Fig. 16 ). The thickest Cerro Toledo deposits
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Box and whiskers plots of the median, 25 to 75% quartile, and range for log...
Published: 01 August 2005
Fig. 8. Box and whiskers plots of the median, 25 to 75% quartile, and range for log 10 α from Otowi Member (Qbo) of the Bandelier Tuff at designated technical areas of Los Alamos National Laboratory.
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Pore water chloride and volumetric water content profiles in Potrillo Canyo...
Published: 01 August 2005
Fig. 7. Pore water chloride and volumetric water content profiles in Potrillo Canyon for Borehole PC-4 (Newman, 2002, unpublished data). Stratigraphic contacts are also shown (Qbt-1g is the Tshierege 1g unit, Tsk is the Tsankawi Pumice Bed, and Qbo is the Otowi Member of the Bandelier Tuff).
Image
Box and whiskers plots of the median, 25 to 75% quartile, and range for log...
Published: 01 August 2005
Fig. 9. Box and whiskers plots of the median, 25 to 75% quartile, and range for log 10 α from Otowi Member (Qbo) of the Bandelier Tuff at designated technical areas of Los Alamos National Laboratory. The canyon samples from Technical Area 21 are labeled as Los Alamos Canyon.
Image
Thick Bandelier Tuff deposits form the mesas of the Pajarito Plateau. Upper...
Published: 01 August 2005
Fig. 15. Thick Bandelier Tuff deposits form the mesas of the Pajarito Plateau. Upper photograph, looking across Pueblo Canyon toward the northwest, shows, in ascending order, the Otowi Member (Qbo), the Cerro Toledo interval (Qct), and the Tshirege Member (Qbt 1 g to Qbt 3, see text). Subunits
Journal Article
Published: 01 December 2002
Mineralogical Magazine (2002) 66 (6): 1075–1098.
...R. Macdonald; H. E. Belkin Abstract The composition of chevkinite and perrierite, the most common members of the chevkinite group, is closely expressed by the formula A 4 BC 2 D 2 Si 4 O 22 , where A = (La,Ce,Ca,Sr,Th), B = Fe 2+ , C = (Fe 2+ ,Fe 3+ ,Ti,Al,Zr,Nb) and D = Ti. The A site is dominated...
FIGURES | View All (8)
Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 01 October 2011
Lithosphere (2011) 3 (5): 328–345.
...Figure 5. Geochemical variation in the (A) Otowi Member and (B) Tshirege Member. SiO 2 versus TiO 2 (left) and Rb versus Nb (right). Data for Qbo in A are from Gardner et al. (1999) . Data for Qbt1, Qbt2, and Qbt3 in B are from Broxton et al. (1995 , 1996 ); Stimac et al. (1996...
FIGURES | View All (10)
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Natural γ, density, density porosity, epithermal-neutron porosity, and resi...
Published: 01 August 2005
, the rhyolitic Tshirege and Otowi Members of the Bandelier Tuff have elevated natural γ signatures relative to the dacitic sedimentary deposits of the Puye Formation. The density porosity was calculated from the density log using a sandstone grain density of 2.65 gm cm −3 . While appropriate for the Puye
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Probability density plots of  87 Sr/ 86 Sr in feldspars from other magma ty...
in > Geology
Published: 01 October 2011
al., 2008 ); Otowi Member of Bandelier Tuff ( Wolff et al., 1999 ; Wolff and Ramos, 2003 ); Taylor Creek Rhyolite ( Knesel et al., 1999 ). Gray vertical bars are whole-rock data from same literature sources. Note that E has 87 Sr/ 86 Sr scale different from those of A−D and Figure 2 due