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Okpilak Batholith

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Journal Article
Published: 01 August 1995
Canadian Journal of Earth Sciences (1995) 32 (8): 1106–1118.
... of thrust sheets and formation of associated fault-bend folds. Apatite and zircon fission-track data from the Okpilak batholith and adjacent sedimentary rocks exposed within the northeastern Brooks Range provide new constraints on the timing, magnitude, and rate of cooling of these thrust sheets...
Image
—Balanced cross section across <span class="search-highlight">Okpilak</span> <span class="search-highlight">batholith</span> along line AA&#x27; in  Figure ...
Published: 01 January 1993
Figure 5 —Balanced cross section across Okpilak batholith along line AA' in Figure 1 . (From Hanks and Wallace, 1990 .) The screw in the northern end of the cross section represents the pin line.
Journal Article
Journal: Geology
Published: 01 May 1990
Geology (1990) 18 (5): 395–398.
...Catherine L. Hanks; Wesley K. Wallace Abstract Involvement of crystalline rocks in thrusting near the foreland basin of a fold-and-thrust belt is relatively uncommon. In the northeastern Brooks Range, the Devonian Okpilak batholith was thrust northward and structurally elevated above adjacent...
Journal Article
Journal: AAPG Bulletin
Published: 01 July 1990
AAPG Bulletin (1990) 74 (7): 1100–1118.
... anticlinorium contains multiple horses, and shortening above the Kayak Shale was accommodated largely by thrust duplication of Mississippian through Triassic rocks. In the narrow central province, the Devonian Okpilak batholith was detached from its roots, internally shortened along shear zones...
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Image
—Photograph looking downplunge to the east along the northern margin of the...
Published: 01 July 1990
Figure 12 —Photograph looking downplunge to the east along the northern margin of the Okpilak batholith. Granitic rocks (Dg) are duplicated on a south-dipping shear zone in the foreground. To the east, the same shear zone places rocks of the Okpilak batholith over rocks of the Lisburne (IPMI
Series: SEPM Core Workshop Notes
Published: 01 January 2001
DOI: 10.2110/cor.01.01.0201
EISBN: 9781565762732
... found in the ANWR strata, and are less metamorphosed than, and compositionally distinct from, the Iviagik. The Topagoruk conglomerate and the East Teshekpuk granite resemble the Ulungarat formation and the Okpilak batholith, respectively, in the northeastern Brooks Range. Introduction “Basement...
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Journal Article
Published: 01 July 1997
Canadian Journal of Earth Sciences (1997) 34 (7): 992–1007.
... to the semiductile behavior of the nearby but much larger Okpilak batholith. Shear was localized in the upper part of the stock and the conglomerate due to partial detachment of the overlying Carboniferous Lisburne Group. North-vergent thrust-related folds formed in the mechanically layered Lisburne Group carbonates...
Image
—Generalized geologic map of the northeastern Brooks Range showing the majo...
Published: 01 July 1990
Figure 2 —Generalized geologic map of the northeastern Brooks Range showing the major structural provinces. Lines indicate approximate locations of schematic cross sections in Figure 7 . WSP = western structural province, OBSP = Okpilak batholith structural province, ESP = eastern structural
Image
—Generalized area-balanced wedge models of a transect across the <span class="search-highlight">Okpilak</span> ba...
Published: 01 January 1993
Figure 3 —Generalized area-balanced wedge models of a transect across the Okpilak batholith of the northeastern Brooks Range. The structural topography of the upper surface of the wedge (the sub-Mississippian unconformity), the depth to the basal detachment surface at the pin line, the location
Image
(A) Time-temperature (depth) plot showing uplift curves based on fission-tr...
Published: 01 November 2003
Cretaceous–Lower Tertiary rocks in the Sadlerochit Mountains, and (3) Ellesmerian rocks in the Okpilak batholith area. Time-averaged uplift trajectory at Leffingwell Ridge was constructed to honor uplift rates inferred from zircon and apatite fission-track data. Depositional ages are from Bird (1998b
Journal Article
Journal: AAPG Bulletin
Published: 01 January 1993
AAPG Bulletin (1993) 77 (1): 19–28.
...Figure 5 —Balanced cross section across Okpilak batholith along line AA' in Figure 1 . (From Hanks and Wallace, 1990 .) The screw in the northern end of the cross section represents the pin line. ...
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Journal Article
Published: 05 December 2018
Canadian Journal of Earth Sciences (2019) 56 (6): 585–606.
... et al. 1976 ; Reiser et al. 1980 ). The large Okpilak Batholith has U–Pb ages of 381 ± 10 Ma ( Dillon et al. 1987 ) and ca. 360 Ma ( Moore and Box 2016 ). Farther west on Alaska’s north slope, the East Teshekpuk granite, near Barrow, is intersected by a petroleum exploration well and unconformably...
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Journal Article
Journal: AAPG Bulletin
Published: 01 November 2003
AAPG Bulletin (2003) 87 (11): 1823–1846.
... Cretaceous–Lower Tertiary rocks in the Sadlerochit Mountains, and (3) Ellesmerian rocks in the Okpilak batholith area. Time-averaged uplift trajectory at Leffingwell Ridge was constructed to honor uplift rates inferred from zircon and apatite fission-track data. Depositional ages are from Bird (1998b...
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Journal Article
Journal: AAPG Bulletin
Published: 01 March 1993
AAPG Bulletin (1993) 77 (3): 359–385.
... Okpilak batholith indicate cooling from temperatures greater than about 290°C occurred at about 59 Ma ( Dillon et al., 1987 ), following metamorphism due to compressional shearing during thrusting. Near the range front, Upper Cretaceous and lower Tertiary rocks have been deformed with older rocks ( Kelley...
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Series: GSA Special Papers
Published: 14 June 2019
DOI: 10.1130/2018.2541(26)
EISBN: 9780813795416
... the Okpilak Batholith suggest a rapid cooling event from ca. 50 to ca. 40 Ma ( O’Sullivan et al., 1995 ). ZFT data from the Leffingwell Ridge area in the northeastern Brooks Range point to exhumation from 68 to 60 Ma ( Parris et al., 2003 ; Fig. 1 ). North of the Sadlerochit Mountains, AFT analyses from...
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Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 01 December 2016
Lithosphere (2016) 8 (6): 649–667.
... to northwest Laurentia throughout the Paleozoic. The pre-Mississippian rocks of the NE Brooks Range are crosscut by a suite of Late Devonian intrusive bodies (e.g., Okpilak batholith and Sedgwick pluton; Fig. 2 ), which yield U-Pb zircon ages of ca. 380–360 Ma ( Dillon et al., 1987 ; Mortensen...
Journal Article
Journal: AAPG Bulletin
Published: 01 January 2006
AAPG Bulletin (2006) 90 (1): 1–20.
... , 1995 , Multiple episodes of Cenozoic denudation in the northeastern Brooks Range: Fission track data from the Okpilak batholith, Alaska : Canadian Journal of Earth Sciences , v. 32 , no. 8 , p. 1106 – 1118 . O'Sullivan , P. B. , W. K. Wallace , and J. M. Murphy , 1998...
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Journal Article
Journal: AAPG Bulletin
Published: 01 July 1998
AAPG Bulletin (1998) 82 (7): 1353–1371.
... Crustal Transect (TACT) : U.S. Geological Survey Open-File Report 93-545 , 104 p. O’Sullivan , P. B. , C. L. Hanks , W. K. Wallace , and P. F. Green , 1995 , Multiple episodes of Cenozoic denudation in the northeastern Brooks Range : fission-track data from the Okpilak...
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Journal Article
Journal: Geosphere
Published: 01 December 2014
Geosphere (2014) 10 (6): 1366–1384.
... unconformity, with a weathered rind that is onlapped by latest Mississippian carbonate strata of the Lisburne Group ( Bird et al., 1978 ; Dumoulin, 2001 ). The Okpilak Batholith and associated Jago Stock in the northeastern Brooks Range have similar onlap relationships with respect to the unconformity...
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Series: GSA Special Papers
Published: 14 June 2019
DOI: 10.1130/2018.2541(25)
EISBN: 9780813795416
... by granite of probable Late Devonian age encountered in the East Teshekpuk #1 well ( Bird et al., 1978 ; Gottlieb et al., 2014 ). The Okpilak batholith and related intrusions have geochemistry and modal mineralogy consistent with S-type granites, implying melting of supracrustal sedimentary rocks ( Sable...
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