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Barcroft Pluton

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Journal Article
Published: 01 April 2002
American Mineralogist (2002) 87 (4): 478–490.
...W.G. Ernst Abstract Mid-Mesozoic to Tertiary igneous activity reflects arc evolution along the Sierra + White-Inyo sector of the continental margin. The Ca-amphibole + biotite ± augite-bearing Middle Jurassic Barcroft pluton consists of intergradational, quartzose gabbro-diorite, metadiorite...
FIGURES | View All (6)
Journal Article
Journal: GSA Bulletin
Published: 01 April 2003
GSA Bulletin (2003) 115 (4): 499–512.
... zircon) Barcroft pluton. Although locally faulted, the subparallel southeast and northwest borders of the body display intrusive contacts. Finer-grained comagmatic metadiorite occurs as early-stage dikes in the wall rocks. Eastward, the 100 Ma McAfee Creek granite intrudes the Barcroft pluton. Tertiary...
FIGURES | View All (8)
Image
( a ; inset) Relief map of the <b>Barcroft</b> <b>pluton</b> illustrating the rough topog...
Published: 01 July 2012
Figure 2 ( a ; inset) Relief map of the Barcroft pluton illustrating the rough topography of the area. ( b ) Geological units within the pluton, showing the three main plutonic phases, localities where oriented cores were collected and elevation contour in feet.
Image
Sketch map of the <b>Barcroft</b> <b>pluton</b>. Some physiographic plus geologic feature...
Published: 01 April 2002
F igure 2. Sketch map of the Barcroft pluton. Some physiographic plus geologic features, and analyzed clinoamphibole sample localities are indicated. For detailed description of the geology, referred to the new 1:24,000 scale map and accompanying text ( Ernst et al. 2001 ).
Journal Article
Published: 01 July 2012
American Mineralogist (2012) 97 (7): 1049–1059.
...Figure 2 ( a ; inset) Relief map of the Barcroft pluton illustrating the rough topography of the area. ( b ) Geological units within the pluton, showing the three main plutonic phases, localities where oriented cores were collected and elevation contour in feet. ...
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Journal Article
Published: 01 January 2005
American Mineralogist (2005) 90 (1): 1–12.
...W.G. Ernst Abstract The NNW-trending White-Inyo Range represents the eastern continuation of the Sierran volcanic-plutonic arc along the central California-Nevada state line. South of White Mountain Peak, the NE-trending, steeply SE-dipping Barcroft structural break transects the orogenic belt...
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Journal Article
Journal: GSA Bulletin
Published: 01 February 1966
GSA Bulletin (1966) 77 (2): 127–152.
...D. O EMERSON Abstract Granitic rocks underlie 120 square miles of the Mt. Barcroft quadrangle portion of the Inyo batholith, California-Nevada. The Barcroft and Cabin Granodiorite plutons make up 18 per cent of this granitic area; the Cottonwood Porphyritic Adamellite pluton, 28 per cent...
Journal Article
Journal: Geology
Published: 01 November 1987
Geology (1987) 15 (11): 1074–1078.
... hiatus across the plutons is called the Barcroft structural break. Recent mapping and new U/Pb zircon ages of 154 +3/−1 Ma and 137 ±1 Ma. from an ash-flow tuff and a hypabyssal intrusion, respectively, indicate that part of the Mesozoic section and the Barcroft structural break are younger than the 160...
Journal Article
Journal: GSA Bulletin
Published: 01 December 1996
GSA Bulletin (1996) 108 (12): 1528–1548.
..., and An contents of plagioclase increase toward the larger, more mafic Barcroft, Cottonwood- Beer Creek, and Joshua Flat plutons, whereas the cation proportions of Si in white micas decrease. Taking into account the ferric iron contents of white micas, Fe 2+ Mg −1 fractionation becomes less pronounced adjacent...
Journal Article
Journal: AAPG Bulletin
Published: 01 July 1996
AAPG Bulletin (1996) 80 (7): 1008–1026.
... Flat and Birch Creek plutons were best done by NS-001 imagery, and the area directly south of the Barcroft Granodiorite was done mainly by field examination. To investigate the mineralogical and spectral characteristics of the Reed Dolomite subunits as they relate to image data, we collected...
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Image
Figure 3. Structural contours (400 ft [122 m] interval) on the <b>Barcroft</b> plu...
Published: 01 April 2003
Figure 3. Structural contours (400 ft [122 m] interval) on the Barcroft pluton–wall rock contacts, determined by the intersection of topography with the margins of the igneous complex. Approximate attitudes of surfaces are indicated by the dip and strike symbols; all are steep except in the extreme
Image
Figure 1. Generalized geologic map of the Mount <b>Barcroft</b> area, after  Ernst...
Published: 01 April 2003
Figure 1. Generalized geologic map of the Mount Barcroft area, after Ernst et al. (2002) . Both Barcroft (165 Ma) and Cottonwood (ca. 175 Ma) Middle Jurassic plutons are truncated by the Late Cretaceous (100 Ma) McAfee Creek Granite. Ages of granitoid emplacement are after Crowder et al. (1973
Image
Figure 7. Initial Sr-Nd isotopic variation for <b>Barcroft</b> series and McAfee C...
Published: 01 April 2003
Figure 7. Initial Sr-Nd isotopic variation for Barcroft series and McAfee Creek plutonic rocks. Numbers adjacent to samples are bulk-rock SiO 2 concentrations. Inset shows variation of Sr isotopic composition with bulk composition and emphasizes that high-silica rocks are enriched in radiogenic Sr
Journal Article
Journal: GSA Bulletin
Published: 01 January 2012
GSA Bulletin (2012) 124 (1-2): 228–239.
... the Barcroft, Cottonwood, Birch Creek, Sage Hen Flat, Papoose Flat, and Marble Canyon plutons. They represent an extended period of episodic magmatism as part of the Cordilleran magmatic arc ( Nelson et al., 1991 ; Ernst et al., 1993 , 2003 ; McKee and Conrad, 1996 ). These plutons and their host rocks were...
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Journal Article
Journal: Geosphere
Published: 01 October 2012
Geosphere (2012) 8 (5): 1086–1103.
...John M. Bartley; Allen F. Glazner; Kevin H. Mahan Abstract Spectacularly exposed contact relations of the Split Mountain interpluton screen, Sierra Nevada batholith, indicate that its bounding plutons grew by injection of dikes. The screen is composed of Cambrian metasedimentary rocks and ranges...
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Series: GSA Special Papers
Published: 01 January 2006
DOI: 10.1130/2006.2413(02)
...; then this composite terrane collided with the yet farther outboard Eastern Hayfork terrane. On the west, below ∼1500 m elevation, the Middle Jurassic Barcroft granodioritic pluton disappears under thick alluvial deposits in Chalfant Valley but is exposed on the flanks and backbone of the central White Mountains...
Image
Figure 5. Representative silica variation diagrams for analyzed <b>plutonic</b> ro...
Published: 01 April 2003
Figure 5. Representative silica variation diagrams for analyzed plutonic rocks. Oxides are in weight percent, trace elements in parts per million. Solid symbols for the Barcroft samples are identified mafic cumulates WM-39, WM-805, and WM-13. Sample WM-724, which we interpret to be a high-silica
Image
Figure 6. MORB-normalized trace element variation diagrams for <b>plutonic</b> roc...
Published: 01 April 2003
Figure 6. MORB-normalized trace element variation diagrams for plutonic rocks. Normalizing values for N-MORB from Sun and McDonough (1989) , except for Sc and Cr from Pearce (1982) . The field for Barcroft granodiorite is shown as a gray background on panels for other rock types to facilitate
Journal Article
Journal: GSA Bulletin
Published: 01 January 2003
GSA Bulletin (2003) 115 (1): 48–57.
...; EV—Eureka Valley facies; JF—Joshua Flat facies. Other plutons: BiC—Birch Creek pluton; BP—Barcroft pluton; CP—Cottonwood pluton; MC—Marble Canyon pluton; PF—Papoose Flat pluton; RC—Redding Canyon pluton; SHF—Sage Hen Flat pluton. Approximate locations for samples collected outside the Redding Canyon...
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Image
Simplified geological map of the White-Inyo Mountains and their Jurassic an...
Published: 01 July 2012
Figure 1 Simplified geological map of the White-Inyo Mountains and their Jurassic and Cretaceous plutons (modified after Dunne et al. 1978 ). The Barcroft pluton is elongate, at a high angle to the White-Inyo Mountains structural trend, and is bounded to the north by the Barcroft structural