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Seventymile Terrane

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Journal Article
Published: 01 January 2000
Canadian Journal of Earth Sciences (2000) 36 (10): 1671-1695.
...–mica schist, quartzite, and amphibolite; the Taylor Mountain assemblage (TM) of mafic schist and gneiss, marble, quartzite, and metachert; and the Seventymile terrane of greenstone, serpentinized peridotite, and Mississippian to Late Triassic metasedimentary rocks. Most LG amphibolites have relatively...
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Journal Article
Published: 24 April 2013
Canadian Journal of Earth Sciences (2013) 50 (8): 826-846.
... of an intervening ocean basin referred to as the Slide Mountain – Seventymile terrane ( Dusel-Bacon et al. 2006 , and references therein). Remnants of this ocean form a discontinuous belt of Alpine-type (fault-bounded) ultramafic rocks, originally derived from the mantle, and associated weakly metamorphosed mafic...
Journal Article
Journal: GSA Bulletin
Published: 01 July 2004
GSA Bulletin (2004) 116 (7-8): 989-1015.
... oceanic igneous and associated sedimentary rocks of the Seventymile terrane (equivalent to the Slide Mountain terrane in Canada) tectonically overlie, or are imbricated with, the Yukon-Tanana terrane in the Yukon-Tanana Upland ( Figs. 1 , 2 , and 4 ). Kinematic and geochronologic studies (e.g...
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Journal Article
Journal: GSA Bulletin
Published: 01 July 2000
GSA Bulletin (2000) 112 (7): 1023-1042.
... overlain by mafic volcanic rocks of the Seventymile terrane that likely represent obducted oceanic crust ( Moore et al., 1994a ). North of the study area is the Arctic Alaska terrane, consisting of a series of subterranes of continental and ocean margin affinity separated by imbricate thrusts (Fig. 1...
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Journal Article
Journal: GSA Bulletin
Published: 01 September 2006
GSA Bulletin (2006) 118 (9-10): 1212-1231.
... – 853 . Mortensen , J.K. , Dusel-Bacon , C. , Hunt , J.A. , and Gabites , J. , 2006 , Lead isotopic constraints on the metallogeny of middle and late Paleozoic syngenetic base metal occurrences in the Yukon-Tanana and Slide Mountain/Seventymile terranes and adjacent portions...
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Journal Article
Published: 08 October 2010
Canadian Journal of Earth Sciences (2010) 47 (10): 1347-1366.
...E. H. Brown; G. E. Gehrels; V. A. Valencia Abstract The Chilliwack composite terrane in northwest Washington is part of an assemblage of mid-Paleozoic arc terranes extending from California to Alaska. Some terranes bear evidence of exotic origin, whereas others apparently formed proximal to western...
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Journal Article
Journal: Geosphere
Published: 01 October 2009
Geosphere (2009) 5 (5): 439-464.
...Stephen J. Piercey; Maurice Colpron Abstract The Yukon-Tanana terrane of the northern Cordillera comprises a basement of metamorphosed continental margin sedimentary rocks of pre–Late Devonian age (Snowcap assemblage) and overlying subduction-generated Late Devonian to Permian arc and backarc...
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Journal Article
Published: 01 June 2000
Canadian Journal of Earth Sciences (2000) 37 (6): 945-956.
...John N. Aleinikoff; G. Lang Farmer; Robert O. Rye; Warren J. Nokleberg Abstract Magnetotelluric traverses across the southern Yukon–Tanana terrane (YTT) reveal the presence of a thick conductive layer (or layers) beneath Paleozoic crystalline rocks. These rocks have been interpreted to be flysch...
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Journal Article
Published: 25 April 2007
Canadian Journal of Earth Sciences (2007) 44 (3): 297-316.
...JoAnne Nelson; George Gehrels Abstract Two samples of late Paleozoic grit and Late Mississippian quartzite–chert conglomerate collected from southeastern Yukon–Tanana terrane (YTT) — a composite thrust sheet resting structurally above North American parautochthonous strata and intervening imbricate...
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Journal Article
Journal: Geosphere
Published: 01 June 2012
Geosphere (2012) 8 (3): 716-739.
... the late Paleozoic, the Cordilleran margin was characterized by a Sea of Japan–like backarc ocean (e.g., Slide Mountain terrane in Canada, Seventymile terrane in Alaska, and Golconda allochthon in western United States) separating a rifted continental arc fragment (Yukon-Tanana and affiliated pericratonic...
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Journal Article
Journal: GSA Bulletin
Published: 16 August 2018
GSA Bulletin (2018) 131 (1-2): 274-298.
... of accretionary orogens. We applied this distinction to the Northern Cordillera in Yukon, British Columbia, and Alaska, and we focused on the identification of upper-plate and lower-plate domains during the late Paleozoic to early Mesozoic evolution of the allochthonous Yukon-Tanana terrane, the west Laurentian...
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Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2007.2431(08)
... Scattered elements of a Late Triassic continental margin and ocean basin(s) occur in central and southern Alaska. These elements include rocks exposed north of the Alaska Range (oceanic rocks of the Seventymile terrane), within the Alaska Range (slope and basin deposits...
Series: Special Publications of the Society of Economic Geologists
Published: 01 January 2013
DOI: 10.5382/SP.17.04
EISBN: 9781629491639
... and a metallogenic framework for the region. Fig. 4. Location of mineral districts and detailed maps. In this section, the mainly Paleozoic tectonic and magmatic evolution of the Yukon-Tanana terrane, as well as Mesozoic to early Cenozoic intrusive episodes affecting this terrane during...
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Journal Article
Journal: Geosphere
Published: 01 June 2015
Geosphere (2015) 11 (3): 786-822.
...., Tempelman-Kluit, 1979 ; Hansen, 1990 ; Nelson et al., 2002 , 2006 ; Dusel-Bacon et al., 2006 ). Remnants of this ocean basin, preserved primarily as discontinuous klippen or fault slivers, make up the Slide Mountain–Seventymile terrane ( Fig. 1 ). Subsequent closure of the intervening ocean basin...
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Image
Figure 2. Simplified stratigraphic columns for the Yukon-Tanana and Seventy...
Published: 01 July 2004
Figure 2. Simplified stratigraphic columns for the Yukon-Tanana and Seventymile terranes, east-central Alaska, showing generalized protolith lithologies and zircon U-Pb and fossil ages. Location of the Delta mineral belt is indicated in Figure 1 by the white square (denoting VMS deposit) south
Image
Simplified geologic map of the eastern Eagle–Tanacross area showing  40 Ar/...
Published: 11 July 2002
and associated quartzite (Klondike Schist unit as shown on Dusel-Bacon et al. 1998 ). Rocks shown as Nisutlin assemblage along the northern and eastern edge of Fig.  3 consist of carbonaceous phyllite and quartzite correlative with the Nasina assemblage in Canada. Rocks shown as part of the Seventymile terrane
Journal Article
Published: 18 August 2001
Canadian Journal of Earth Sciences (2001) 38 (8): 1191-1204.
... subducted during an early Mesozoic shortening episode that resulted from closure of an ocean basin (now represented by klippe of the Seventymile terrane) and collision and obduction of an outboard-arc and marginal-basin assemblage (Taylor Mountain assemblage and likely the upper part of the Nisutlin...
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Journal Article
Journal: Lithosphere
Published: 11 October 2017
Lithosphere (2017) 9 (6): 927-952.
... that terminology herein. The allochthonous Yukon-Tanana terrane was rejoined to the continental margin, including the parautochthonous North American continental margin, as an intervening ocean basin (Slide Mountain–Seventymile terranes; black unit in Fig. 1 ) progressively closed along its western margin...
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Journal Article
Journal: AAPG Bulletin
Published: 11 November 1993
AAPG Bulletin (1993) 77 (11): 1874-1903.
... hydrocarbon source rocks into the oil-generation window. The western foreland basin deposits were overridden by advancing thrusts, and tectonically buried to as deep as 10 km. These disparate thermal domains are juxtaposed along the Glenn Creek fault, which may represent a terrane boundary in east-central...
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Image
Simplified geologic map of the southeastern Big Delta quadrangle showing  4...
Published: 11 July 2002
with the exception that units shown in dark grey consist of ultramafic rocks, many of which occur in small foliated masses infolded with amphibolite-facies gneiss and schist, which may have a different origin from those in the Seventymile terrane. Ages (in Ma) are rounded to nearest whole number; age uncertainties