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Slate Creek Complex

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Journal Article
Journal: GSA Bulletin
Published: 01 August 2001
GSA Bulletin (2001) 113 (8): 1105–1118.
... in the Slate Creek Complex, a volcano-plutonic terrane in the central part of the northern Sierra Nevada. New 40 Ar- 39 Ar ages from relict volcanic hornblende demonstrate that the youngest volcanic unit in the Slate Creek Complex is ca. 170 Ma, at least 30 m.y. younger than previous estimates of ca. 200 Ma...
FIGURES
First thumbnail for: Timing of arc construction and metamorphism in the...
Second thumbnail for: Timing of arc construction and metamorphism in the...
Third thumbnail for: Timing of arc construction and metamorphism in the...
Journal Article
Journal: GSA Bulletin
Published: 01 November 2004
GSA Bulletin (2004) 116 (11-12): 1515–1528.
... Slate Creek complex (ca. 203−171 Ma) in the Central belt; the Late Jurassic Smartville complex (159 ± 3 Ma) in the Western belt; and crosscutting intrusions ranging from Middle Jurassic to Early Cretaceous age. The new ages imply that the Central and Western belts have been part of the same terrane...
FIGURES
First thumbnail for: Tectonic setting of the Jurassic Smartville and <s...
Second thumbnail for: Tectonic setting of the Jurassic Smartville and <s...
Third thumbnail for: Tectonic setting of the Jurassic Smartville and <s...
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Figure 4. Schematic geologic column of the Slate Creek complex. Illustrated dates are discussed in text. The Slate Creek complex overlies the Fiddle Creek complex on the Slate Creek thrust fault (Edelman et al., 1989b).
Published: 01 November 2004
Figure 4. Schematic geologic column of the Slate Creek complex. Illustrated dates are discussed in text. The Slate Creek complex overlies the Fiddle Creek complex on the Slate Creek thrust fault ( Edelman et al., 1989b ).
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Figure 2. (A) Geologic map of the Slate Creek Complex and vicinity (Zigan, 1981; Hietanen,  1981; Edelman et al., 1989b). Rivers and reservoirs plotted for location reference. Metamorphic  facies boundaries are based on mineral assemblages in mafic rocks in the Slate  Creek Complex and Owl Gulch volcanics. See Figure 1 for location and Figure 2B for key.  Abbreviations of pluton names: Cp—Cascade, YRp—Yuba Rivers, IVp—Indian Valley,  Sp—Scales
Published: 01 August 2001
Figure 2. (A) Geologic map of the Slate Creek Complex and vicinity ( Zigan, 1981 ; Hietanen, 1981 ; Edelman et al., 1989b ). Rivers and reservoirs plotted for location reference. Metamorphic facies boundaries are based on mineral assemblages in mafic rocks in the Slate Creek Complex and Owl
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 Figure 5. Ar-release spectra of amphiboles from the Slate Creek Complex plutonic unit. Shading indicates steps used to compute weighted mean plateau ages (WMPAs)  for F92-36 and F94-117. Steps denoted by diagonal stripes not used to calculate WMPAs. Amphibole from F94-13 did not yield a plateau. Total fusion ages (TFAs) also  shown. Uncertainties (1σ) plotted for each step exclude error in irradiation parameter J. Some of the low-temperature steps have uncertainties extending beyond the  time interval shown (see footnote 1 concerning data placed in GSA Data Repository). K/Ca ratios from step releases and electron-microprobe analyses (EMP) also plotted.  K/Ca ratios determined by electron microprobe are lower than ratios detected during step heating and probably reflect either minor K-rich impurities in the samples or  an analytical discrepancy between the microprobe and step-heating results. Multiple compositional varieties of amphibole are present in F94-13; EMP K/Ca ratio plotted  is from analyses of coarse-grained, equant, Al-rich grains that compose most of the amphibole in this sample. See Figure 4 for sample locations
Published: 01 August 2001
Figure 5. Ar-release spectra of amphiboles from the Slate Creek Complex plutonic unit. Shading indicates steps used to compute weighted mean plateau ages (WMPAs) for F92-36 and F94-117. Steps denoted by diagonal stripes not used to calculate WMPAs. Amphibole from F94-13 did not yield a plateau
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 Figure 6. Textures from the supracrustal unit of the Slate Creek Complex. (A) Foliated lithic metatuff breccia, American House volcanics.  Lithic fragments are massive ovoids with long dimension parallel to the length of the photograph. Foliation wraps around the lithic  fragments and is also parallel to the length of the photograph. Pencil for scale. (B) Photomicrograph of volcaniclastic textures, Gold  Run formation. Two-thirds of photograph consist of a single lithic clast, which is lighter than the adjacent matrix. Phenocrysts of  feldspar (f, now replaced by albite + sericite), relict pyroxene (p), and relict hornblende (h) can be recognized in lithic fragment. Broken  feldspar crystal at fragment margin consistent with epiclastic origin. Long dimension of photograph represents ∼4 mm. Plane-polarized  light. (C) Backscattered-electron (BSE) image of metamorphosed tuff F94-20 from Lexington Hill volcanics. Relict volcanic hornblende  (h) is overgrown by actinolite (a) and chlorite (c). White dashed line denotes boundary between large hornblende prism and epitaxial  actinolite. Epidote (e) and albite (dark gray to black) are also part of the metamorphic assemblage. Scale bar represents 100 μm
Published: 01 August 2001
Figure 6. Textures from the supracrustal unit of the Slate Creek Complex. (A) Foliated lithic metatuff breccia, American House volcanics. Lithic fragments are massive ovoids with long dimension parallel to the length of the photograph. Foliation wraps around the lithic fragments and is also
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 Figure 10. Schematic cross sections comparing the Slate Creek Complex (right) with the  Rattlesnake Creek and Western Hayfork terranes (left). Thick lines represent fault boundaries;  thin lines represent intrusive or depositional contacts. The boundary between the  Gold Run formation and Lexington Hill volcanics may be a faulted depositional contact.  The 193 Ma age suggested for the upper part of the American House volcanics is based  on the correlation with tuff dated by Saleeby et al. (1989) and mapped by Hietanen (1981,  1976). A harzburgite tectonite body located to the west of the main body of the Slate  Creek Complex was correlated with the Slate Creek ultramafic unit by Edelman et al.  (1989b), suggesting a possible mantle component in the ultramafic unit. The fault between  the Slate Creek ultramafic unit and the Fiddle Creek Complex is interpreted as an east- vergent thrust (Moores and Day, 1984; Day et al., 1985; Edelman et al., 1989b), but the  present geometry of the fault exposed on Slate Creek is vertical
Published: 01 August 2001
Figure 10. Schematic cross sections comparing the Slate Creek Complex (right) with the Rattlesnake Creek and Western Hayfork terranes (left). Thick lines represent fault boundaries; thin lines represent intrusive or depositional contacts. The boundary between the Gold Run formation and Lexington
Journal Article
Journal: Geology
Published: 01 November 1989
Geology (1989) 17 (11): 1032–1035.
...Steven H. Edelman; Howard W. Day; M. E. Bickford Abstract U-Pb zircon ages combined with stratigraphic and structural data indicate that ca. 160 Ma are rocks of the Smartville Complex were constructed across ca. 200 Ma arc rocks of the Slate Creek Complex, which were already juxtaposed against more...
Series: GSA Special Papers
Published: 01 January 1989
DOI: 10.1130/SPE224-p1
... facies metamorphism is early Mesozoic or older. Several small outliers of Shoo Fly (Eastern belt) sandstone are present in the Feather River peridotite belt. The Central belt consists of the Calaveras Complex, the Fiddle Creek Complex, and the Slate Creek Complex. The late Paleozoic–early Mesozoic...
.../Devils Gate ophiolite, the Red Ant Schist, the Calaveras Complex, and the Fiddle Creek Complex. The f 2 Slate Creek thrust dips shallowly west; it places the Slate Creek Complex over the Red Ant Schist, Calaveras Complex, and Fiddle Creek Complex, and thus cuts two f 1 faults. As many as three Early...
Journal Article
Journal: Geology
Published: 01 February 1991
Geology (1991) 19 (2): 180–184.
...Yildirim Dilek; Peter Thy; Eldridge M. Moores Abstract In the northwestern Sierra Nevada, California, volcanic and plutonic rocks of the Smartville and Slate Creek complexes, both fragments of a Jurassic arc terrane, are tectonically juxtaposed against ophiolitic and marine rocks that represent...
... sedimentary strata interlayered with 200-Ma mafic volcanic-plutonic arc rocks, all resting on a 300-Ma ophiolitic basement; suturing against the structurally higher Mariposa Formation took place after deformation of the latter at ca. 150 Ma. (5) The Slate Creek complex, and possibly the Lake Combie, Owl Gulch...
... of a metasomatically enriched source during early stages of subduction. We infer that this subduction during Early Jurassic time may have under-plated the preexisting oceanic basement and produced a submarine volcanic arc terrane. Part of the Smartville complex and the entire Slate Creek complex are interpreted...
Journal Article
Journal: Geology
Published: 01 May 1997
Geology (1997) 25 (5): 395–398.
... dehydration process. In the ophiolitic Slate Creek complex, northern California, clinopyroxene exhibits four textural stages of alteration: (1) clinopyroxene, (2) clinopyroxene + chlorite ± amphibole, (3) amphibole + chlorite, and (4) amphibole. This transformation occurs in subgreenschist to greenschist...
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Published: 01 August 2001
TABLE 1. ISOTOPIC AGE CONSTRAINTS ON ORIGIN AND METAMORPHISM OF THE SLATE CREEK COMPLEX (SCC)
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Published: 01 August 2001
TABLE 2. MAP UNITS USED BY DIFFERENT WORKERS TO DESCRIBE THE SLATE CREEK COMPLEX
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 Figure 8. Ar-release spectra of amphiboles from rocks that intrude the Slate Creek Complex. Shading, abbreviations, and uncertainties same as in Figure 5. Lowest  temperature step (87.8 ± 7.7 Ma) of F94-10 not in time interval shown (see footnote 1 concerning data placed in GSA Data Repository). Inverse isochron of F94-54 shown  in Figure 9. K/Ca ratios determined by electron microprobe are lower than the ratios detected during step heating and probably reflect either minor K-rich impurities  in the samples or an analytical discrepancy between the microprobe and step-heating results. See Figure 4 for sample locations
Published: 01 August 2001
Figure 8. Ar-release spectra of amphiboles from rocks that intrude the Slate Creek Complex. Shading, abbreviations, and uncertainties same as in Figure 5 . Lowest temperature step (87.8 ± 7.7 Ma) of F94-10 not in time interval shown (see footnote 1 concerning data placed in GSA Data Repository
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 Figure 7. Ar-release spectra of relict volcanic amphiboles from the Lexington Hill volcanics, Slate Creek Complex. Shading, abbreviations,  and uncertainties same as in Figure 5. Weighted mean age (WMA) for F94-23 calculated from steps accounting for less than 50%  of the 39Ar released. Lowest-temperature step (102.1 ± 20.1 Ma) of F94-23 has uncertainty extending beyond time interval shown (see  footnote 1 concerning data placed in GSA Data Repository). K/Ca ratios determined by electron microprobe are lower than ratios  detected during step heating and probably reflect either minor K-rich impurities in the samples or an analytical discrepancy between  the microprobe and step-heating results. See Figure 4 for sample locations
Published: 01 August 2001
Figure 7. Ar-release spectra of relict volcanic amphiboles from the Lexington Hill volcanics, Slate Creek Complex. Shading, abbreviations, and uncertainties same as in Figure 5 . Weighted mean age (WMA) for F94-23 calculated from steps accounting for less than 50% of the 39 Ar released. Lowest
Journal Article
Published: 01 June 1985
Bulletin of Canadian Petroleum Geology (1985) 33 (2): 184–203.
... undeformed in a continuous section measured in the Cushing Creek area of the southern Canadian Rocky Mountains, northeast of McBride, British Columbia. The Miette Group comprises three units in the study area. Black slate, dark grey limestone and calcareous grits characterize the lower Miette, which is more...
Journal Article
Journal: GSA Bulletin
Published: 01 November 1986
GSA Bulletin (1986) 97 (11): 1329–1344.
.... This confirms field studies which indicate that the Charlotte belt contains a plutonic metaigneous complex that developed as a sub-volcanic-arc infrastructure, contemporaneous with vulcanism manifested in the Carolina slate belt. Both paleontological and geochronological controls indicate that the South...