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Vishnu Schist

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Journal Article
Journal: Geology
Published: 01 December 2010
Geology (2010) 38 (12): 1099-1102.
...Owen P. Shufeldt; Karl E. Karlstrom; George E. Gehrels; Katherine E. Howard Abstract U-Pb dating of 1035 detrital zircons from 12 spatially distributed samples of the Paleoproterozoic Vishnu Schist (Arizona, United States) reveals a bimodal 207 Pb/ 206 Pb age probability diagram with peaks at 1.8...
FIGURES
Journal Article
Journal: GSA Bulletin
Published: 01 September 2015
GSA Bulletin (2015) 127 (9-10): 1391-1410.
... of this Archean component are also unclear. This paper analyzes the U-Pb age and Hf isotopic composition of zircons from both the oldest granodiorite plutons (1.84–1.71 Ga) and the oldest metasedimentary rocks (1.75 Ga Vishnu Schist) across a 180-km-long cross-strike transect in Grand Canyon. This transect...
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Compiled <b>Vishnu</b> <b>Schist</b> U-Pb-Hf data show that the <b>Vishnu</b> <b>Schist</b> was derived...
Published: 01 September 2015
Figure 10. Compiled Vishnu Schist U-Pb-Hf data show that the Vishnu Schist was derived from an Archean craton characterized by extensive crustal reworking at ca. 1.8 Ga, ca. 2.5 Ga, and ca. 3.2 Ga. DM—depleted mantle; CHUR—chondritic uniform reservoir.
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Comparison and synthesis of new and previous <b>Vishnu</b> <b>Schist</b> detrital zircon ...
Published: 01 September 2015
Figure 6. Comparison and synthesis of new and previous Vishnu Schist detrital zircon U-Pb age data. (A) Composite age probability plot taken from Shufeldt et al. (2010) . (B) New detrital zircon ages obtained for this study. (C) New composite age probability plot with all current Vishnu Schist
Journal Article
Journal: GSA Bulletin
Published: 01 September 1996
GSA Bulletin (1996) 108 (9): 1149-1166.
...Bradley R. Ilg; Karl E. Karlstrom; David P. Hawkins; Michael L. Williams Abstract Paleoproterozoic supracrustal rocks of the Upper Granite Gorge are divided into three mappable units: the Rama, Brahma, and Vishnu Schists, here collectively named the “Granite Gorge Metamorphic Suite.” The Brahma...
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Field photo of the Zoroaster pluton showing one of many screens of <b>Vishnu</b> S...
Published: 01 September 2015
Figure 13. Field photo of the Zoroaster pluton showing one of many screens of Vishnu Schist included within the pluton.
Journal Article
Journal: GSA Bulletin
Published: 01 November 1951
GSA Bulletin (1951) 62 (11): 1331-1346.
...CHARLES A ANDERSON Abstract The older Precambrian rocks of Arizona include the Vishnu, Yavapai, and Pinal schists, all overlain unconformably by nonmetamorphosed younger Precambrian rocks. The older Precambrian schists, unnamed gneisses, and associated granitic masses crop out in many...
Series: GSA Memoirs
Published: 01 January 1978
DOI: 10.1130/MEM152-p341
... faults from Cataract Creek on the southwest to the Echo Cliffs on the northeast. Beyond the Echo Cliffs, the system continues northeastward to the vicinity of Monument Valley as a more diffuse, discontinuous zone of normal faults. The Bright Angel fault, Vishnu fault, and Eminence Break graben are among...
Journal Article
Journal: Geosphere
Published: 01 December 2016
Geosphere (2016) 12 (6): 1774-1794.
... was the source for a large fraction of the sand grains in the Jerome Canyon sandstone. A distinctive population of similar-age zircons was also identified in ten samples of Vishnu Schist ( Ilg et al., 1996 ; Karlstrom et al., 2012 ) from ∼150 km to the north-northeast in eastern Grand Canyon, and in two...
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Plate-tectonic cartoons illustrating possible scenarios for the depositiona...
Published: 01 September 2015
Figure 15. Plate-tectonic cartoons illustrating possible scenarios for the depositional setting of the Vishnu Schist and lithospheric formation in the Grand Canyon region. Cartoons are drawn approximately to scale; however, crustal thickness is exaggerated. Both models meet at ca. 1740 Ma (E
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U-Pb-Hf isotopic data from zircons separated from 1.78 to 1.74 Ga Mojave Pr...
Published: 01 September 2015
Figure 12. U-Pb-Hf isotopic data from zircons separated from 1.78 to 1.74 Ga Mojave Province plutonic rocks shown in white ( Wooden et al., 2012 ) compared to the Vishnu Schist. DM—depleted mantle; CHUR—chondritic uniform reservoir.
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Synthesis of all U-Pb-Hf data from plutonic and detrital samples in Grand C...
Published: 01 September 2015
Figure 11. Synthesis of all U-Pb-Hf data from plutonic and detrital samples in Grand Canyon. Vishnu Schist is shown in blue, plutons east of the Crystal shear zone (Csz) in green, and plutons west of the Crystal shear zone in red. The dramatic difference in plutonic zircons is apparent
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Paired U-Pb-Hf isotopic data for all supracrustal lithologies in Grand Cany...
Published: 01 September 2015
–79.6R is of the Rama Schist (shown in red); all other data are Vishnu Schist. Below are normalized detrital zircon age probability plots of grains for which we have obtained Lu-Hf isotopic data.
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207 Pb/  206 Pb age histograms and age probability plots of older grains (o...
in > Geology
Published: 01 December 2010
Figure 2. 207 Pb/ 206 Pb age histograms and age probability plots of older grains (older than 2.2 Ga). A: Vishnu Schist samples. B: Wyoming craton. C: Gawler craton of Australia. D: South China craton. E: North China craton. F: Antarctica. G: Siberian craton. Data were compiled from igneous
Journal Article
Journal: AAPG Bulletin
Published: 01 January 1961
AAPG Bulletin (1961) 45 (1): 95-97.
....  9 Supai fm. 10 Redwall ls. 11 Muav ls. 12, 13 Grand Canyon series 14-16 Vishnu schist The dial diagram ( Fig. 1 ) summarizing strike readings of all joints shows that the dominant directions of jointing are northeast and northwest and correspond rather closely...
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Journal Article
Journal: AAPG Bulletin
Published: 01 November 1946
AAPG Bulletin (1946) 30 (11): 1899-1909.
..., the entire Unkar group has been removed by erosion on the eastern side of the fault and the Tapeats sandstone rests directly on the Vishnu schists. 2. On the north side of the Colorado River, near the mouth of Bright Angel Canyon, where 1,500 feet of Unkar sediments are exposed below the Tapeats sandstone...
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Series: GSA Special Papers
Published: 01 November 2012
DOI: 10.1130/2012.2489(00)
... of the Upper Granite Gorge. The metamorphic rocks are called the Granite Gorge Metamorphic Suite, and the igneous rocks are called the Zoroaster Plutonic Complex. These rocks include the Vishnu Schist and, because of familiarity with this term, we refer to the entire rock suite as the Vishnu basement...
FIGURES
Journal Article
Journal: Lithosphere
Published: 01 August 2015
Lithosphere (2015) 7 (4): 465-472.
... ). Paleoproterozoic successions in Colorado and New Mexico have strongly unimodal detrital zircon age spectra that largely reflect local sources ( Fig. 2B , panels F and G). The ca. 1.75 Ga Vishnu Schist, exposed primarily in the Grand Canyon of Arizona (GC in Fig. 2A ), is a notable exception that contains...
FIGURES
Journal Article
Journal: GSA Bulletin
Published: 01 January 2007
GSA Bulletin (2007) 119 (1-2): 202-220.
... zones characterized by intense subvertical, NE-striking, S 2 -parallel foliation define boundaries between the six lithotectonic blocks. The Vishnu shear zone (RM 81: Fig. 3 ) marks the boundary between the Mineral Canyon and Clear Creek blocks. A penetrative NE-striking foliation in the host schist...
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Journal Article
Journal: AAPG Bulletin
Published: 01 August 2003
AAPG Bulletin (2003) 87 (8): 1299-1321.
... ). The GCS is comprised of a series of gently dipping sedimentary and igneous strata that overlie the schists (Vishnu Metamorphic Complex) and granites of the inner gorge (Granite Gorge Metamorphic Suite of Ilg et al., 1996 ) of the Grand Canyon ( Figure 2 ). Rocks of the GCS are in turn overlain by flat...
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