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Sierra Ancha sill complex

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Journal Article
Journal: GSA Bulletin
Published: 01 June 1970
GSA Bulletin (1970) 81 (6): 1733-1766.
...C. E NEHRU; MARTIN PRINZ Abstract The Sierra Ancha sill complex is a major high-alumina basaltic intrusive of late Precambrian age in the central Arizona dolerite province. It consists of three zones: lower dolerite, 200 ft; microtroctolite (fine-grained plagioclase-olivine rock with minor coarse...
Journal Article
Journal: GSA Bulletin
Published: 01 April 1975
GSA Bulletin (1975) 86 (4): 503-513.
...DOUGLAS SMITH; LEON T. SILVER Abstract Lenses of granitic and syenitic granophyre unusually rich in potassium crop out at and near the roof of a Precambrian sill complex of olivine diabase intruded into the Apache Group. The lenses locally are 45 m thick; the diabase is 210 to 240 m thick...
Journal Article
Published: 28 July 2000
Canadian Journal of Earth Sciences (2000) 37 (8): 1109-1119.
... Montana . Canadian Journal of Earth Sciences , 35 : 467 – 475 . Smith D. Silver L.T. 1975 . Potassic granophyre associated with Precambrian diabase, Sierra Ancha, central Arizona . Geological Society of America Bulletin , 86 : 503 – 513 . Walker F. 1958 . The pegmatitic...
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Journal Article
Journal: GSA Bulletin
Published: 01 November 2005
GSA Bulletin (2005) 117 (11-12): 1427-1450.
... of diabase as is commonly found in similar situations (see later comments), and is interpreted as the product of melting in the contact zone and thus as not a product of differentiation processes within the sill. Relative to the rest of the sill, the Sierra Ancha diabase directly adjacent to the granophyre...
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Journal Article
Journal: Lithosphere
Published: 01 June 2014
Lithosphere (2014) 6 (3): 135-156.
... by ∼20 m.y. ( Söderlund et al., 2013 ); it should be considered whether the 1069 Ma age for the Death Valley sill may be similarly too young. Shastri et al. (1991) reported (in an abstract) TIMS ages of 1100 ± 2 Ma of baddeleyite and zircon from Sierra Ancha in central Arizona and 1080 ± 20 Ma...
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Series: GSA Field Guide
Published: 01 January 2008
DOI: 10.1130/2008.0013(04)
EISBN: 9780813756134
... was chosen to observe the westernmost contact between the basement uplift of Sierras Pampeanas and Precordillera, the early Paleozoic stratigraphy, and the Andean structure of the Precordillera, as well as a complete section of the Frontal and Principal Cordilleras in Argentina and Chile. The trip ends...
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Series: GSA Field Guides
Published: 04 September 2019
DOI: 10.1130/2019.0055(07)
EISBN: 9780813756544
... Mountains and in the Sierra Ancha ( Gastil, 1958 ; Ludwig, 1974 ). The textures are also very similar to extrusive basalt lavas, so it may be tempting, and misleading, to describe these as interbedded mafic lava flows. The texture variations indicate that the sill may be a composite of several discrete...
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Journal Article
Published: 01 March 2015
Journal of the Geological Society (2015) 172 (2): 186-200.
... ). Detrital zircon dating indicates an Early Carboniferous maximal depositional age for the upper part of the Sierra Argomedo Formation (this study). It mainly contains pelite and some sandstone with metre-thick volcanic or subvolcanic intercalations that are interpreted as flows or sills ( Breitkreuz 1985...
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Series: GSA Field Guides
Published: 04 September 2019
DOI: 10.1130/2019.0055(02)
EISBN: 9780813756544
... of supercontinent Rodinia (e.g., Timmons et al., 2001 ). Sedimentary rocks deposited in these basins include the Mesoproterozoic Apache Group, exposed in the Sierra Ancha, visible to the east of the Day 1 field-trip route near Rye. Following the breakup of Rodinia and throughout the early and middle Paleozoic Era...
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Series: Special Publications of the Society of Economic Geologists
Published: 01 January 2010
DOI: 10.5382/SP.15.1.17
EISBN: 9781629490397
... one-third of the study area (grouped with the Apache Group in Fig. 2 ), as described by Cornwall and Krieger (1975b) . The ca. 1.1 Ga Sierra Ancha Diabase crops out as sills, flat sheets, and dikes. The unit commonly displays a strong subophitic, diabasic texture. Mineralogically, the diabase...
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Journal Article
Journal: GSA Bulletin
Published: 01 October 2001
GSA Bulletin (2001) 113 (10): 1343-1356.
... America led to formation of the Cordilleran miogeocline. The Sahuaripa strata are divided into four formations, the Mina el Mezquite, Monteso, Sierra Chiltepin, and Macho. We collected samples from a conspicuous quartzite (Sahuaripa Member) of the Monteso Formation and from coarse-grained...
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Series: GSA Field Guides
Published: 04 September 2019
DOI: 10.1130/2019.0055(10)
EISBN: 9780813756544
... in central Arizona to encompass deformation and metamorphism of similar age in New Mexico, southern Colorado ( Shaw and Karlstrom, 1999 ), and most recently, southern Wyoming ( Duebendorfer et al., 2015 ) ( Fig. 1 ). Figure 1. Regional location map. PRC—Priest River Complex; GFTZ—Great Falls tectonic...
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Journal Article
Journal: AAPG Bulletin
Published: 01 August 1932
AAPG Bulletin (1932) 16 (8): 837-858.
... Bella oil field, wells beginning in the Kern River formation of Pliocene age have found oil in the basal arkose and in the underlying basement complex rocks of the Sierra Nevada (G. Clark Gester). Ventura County .—The Conejo Pass oil field, Ventura County, produces from basalt agglomerate...
Journal Article
Published: 07 September 2007
Canadian Journal of Earth Sciences (2007) 44 (8): 1131-1149.
... of the Mesoproterozoic English Bay granite–rhyolite complex, northwestern Ontario . Canadian Journal of Earth Sciences , 41 : 1329 – 1338 . Hollings P. Fralick P. Cousens B. 2007 . Early history of the Midcontinent Rift inferred from geochemistry and sedimentology of the Mesoproterozoic Osler...
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