Gravina Belt

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Journal Article
Published: 01 March 1998
Canadian Journal of Earth Sciences (1998) 35 (3): 253-268.
...Paul A Kapp; George E Gehrels Abstract Upper Jurassic - Lower Cretaceous marine clastic strata and mafic to intermediate volcanic rocks of the Gravina belt are part of a complex suture zone separating the Alexander and Wrangellia terranes on the west from the Yukon-Tanana and Stikine terranes...
Journal Article
Published: 24 September 2018
Canadian Journal of Earth Sciences (2019) 56 (1): 77-100.
.... The basin, preserved as the Gravina–Nutzotin belt, includes the Dezadeash Formation in southwest Yukon, the Nutzotin Mountains sequence in southern Alaska, and the Gravina belt in southeastern Alaska. The Dezadeash Formation is a submarine fan system comprising stacked channel-lobe transition and lobe...
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Journal Article
Journal: GSA Bulletin
Published: 01 November 1993
GSA Bulletin (1993) 105 (11): 1400-1414.
...HARVEY A. COHEN; NEIL LUNDBERG Abstract Sandstones of the Upper Jurassic to mid-Cretaceous Seymour Canal Formation (northern Gravina belt, southeastern Alaska) are volcaniclastic wackes. They exhibit a variably developed solution cleavage and zeolite- to low-greenschist-grade metamorphic...
Journal Article
Published: 27 January 2004
Canadian Journal of Earth Sciences (2004) 41 (1): 87-102.
...Glen R. Himmelberg; Peter J. Haeussler; David A. Brew Abstract In southeastern Alaska, granodiorite–tonalite plutons of the Admiralty–Revillagigedo belt intruded the Jurassic–Cretaceous Gravina belt along the eastern side of the Alexander terrane around 90 Ma. These plutons postdate some...
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Series: DNAG, Geology of North America
Published: 01 January 1994
DOI: 10.1130/DNAG-GNA-G1.621
EISBN: 9780813754536
... elsewhere in this volume (Dusel-Bacon, this volume), and the magmatic activity is a continuation of the late Mesozoic activity discussed by Miller (this volume). Postaccretionary geologic history starts with the accumulation of the Gravina belt overlap assemblage of rocks in Late Jurassic and Early...
Journal Article
Published: 01 June 1991
Canadian Journal of Earth Sciences (1991) 28 (6): 912-928.
... Cretaceous – Paleocene Le Conte Bay shear zone in central southeastern Alaska. Ductile structures that make up the Sumdum–Fanshaw fault system record the east-directed underthrusting of the Alexander terrane and Gravina belt beneath the Ruth assemblage (Yukon–Tanana terrane) and Taku terrane...
Journal Article
Journal: GSA Bulletin
Published: 01 October 1990
GSA Bulletin (1990) 102 (10): 1378-1392.
... shear during Early or Middle Jurassic time. Clastic and volcanic rocks correlated with the Upper Jurassic and Lower Cretaceous strata of the Gravina belt lack the fabrics characteristic of the deformed Alexander terrane strata and are inferred to unconformably overlie the shear zone. Deformational...
Journal Article
Published: 22 April 2016
Canadian Journal of Earth Sciences (2016) 53 (10): 979-992.
... in southeastern Alaska. These rocks are juxtaposed along mid-Cretaceous thrust faults over Jura-Cretaceous basinal strata of the Gravina belt to the west and beneath Proterozoic through Carboniferous metamorphic rocks of the Yukon–Tanana terrane to the east. This paper presents U–Pb ages and Hf isotope analyses...
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Journal Article
Journal: GSA Bulletin
Published: 01 June 1991
GSA Bulletin (1991) 103 (6): 829-841.
... structurally above the younger metasedimentary rocks of the Gravina belt. The contact between these units was subsequently cut by the Moth Bay pluton. The southern margin of the Moth Bay pluton has been transformed to blastomylonite. Contact metamorphic textures and undeformed dikes which cut...
Journal Article
Journal: AAPG Bulletin
Published: 01 April 2001
AAPG Bulletin (2001) 85 (4): 661-689.
...Luis Pomar; Marcello Tropeano Abstract Excellent outcrops of the upper Pliocene-lower Pleistocene Calcarenite di Gravina around Matera (southern Italy) provide continuous exposure of coarse-grained, clastic basin-margin, shoreline to offshore facies. Among these facies, the most conspicuous...
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Series: Geological Society, London, Special Publications
Published: 01 January 2000
DOI: 10.1144/GSL.SP.2000.172.01.11
EISBN: 9781862394209
... carbonate sedimentation to falling relative sea-level. The studied deposits crop out in the Murge area of Puglia, SE Italy (Figs 1 , 2 ), and belong to the upper Pliocene-lower Pleistocene carbonate dominated Calcarenite di Gravina Formation ( Azzaroli 1968 ; Iannone & Pieri 1979 ). The formation...
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Series: GSA Memoirs
Published: 01 January 1983
DOI: 10.1130/MEM159-p171
...), and Alexander terranes; the Muir-Chichagof belt is in the Alexander and Wrangell terranes; the Admiralty-Revillagigedo belt is in the Gravina and Taku terranes; the Klukwan-Duke belt is in the Gravina, Taku, and Alexander terranes; the Coast Plutonic Complex sill belt is probably between the Taku and Tracy Arm...
Directional provenance indicators from the <b>Gravina</b>–Nutzotin <b>belt</b>: the Nutzo...
Published: 24 September 2018
Fig. 5. Directional provenance indicators from the Gravina–Nutzotin belt: the Nutzotin Mountains sequence compiled from Kozinski (1985) and Manuszak et al. (2007) ; the Dezadeash Formation compiled after Eisbacher (1976) and Lowey (1980 , 1998 ); and the Gravina Belt compiled after Cohen
Journal Article
Published: 01 June 1991
Canadian Journal of Earth Sciences (1991) 28 (6): 840-853.
... the Chugach, Wrangellia, Alexander, Stikine, and Cache Creek terranes, the Gravina and Laberge overlap assemblages, intrusive and metamorphic belts, and neotectonic faults that bound major blocks. Linear belts of magnetic highs are associated with Jurassic and Cretaceous granitic belts in Wrangellia...
Series: Economic Geology Monograph Series
Published: 01 January 1997
DOI: 10.5382/Mono.09.02
EISBN: 9781629490045
... and in rocks of the inboard Gravina flysch basin soon afterttheir accrelinn along soutb-central Alaska and were coeval with continuing suhduction along the southern margin of these leiraues. The associated thermal event probably aLso drove fluid circulation that led to deposition of Keuneeott-type copper ores...
Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2007.2431(06)
... or southeastern part of the study area is the Late Jurassic and Early Cretaceous Gravina-Nutzotin-Gambier volcanic-plutonic-sedimentary belt (Fig. 2) . These two assemblages of flysch and locally associated, coeval volcanic and plutonic rocks form a major belt that is several thousand kilometers long...
Journal Article
Published: 31 October 2001
Canadian Journal of Earth Sciences (2001) 38 (11): 1579-1599.
... metavolcanic and metasedimentary rocks of the Taku terrane, middle and upper Paleozoic metavolcanic and metasedimentary rocks that belong to the Yukon–Tanana terrane, and Jurassic–Cretaceous basinal metasedimentary rocks of the Gravina belt. All of these assemblages were regionally metamorphosed, penetratively...
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Series: GSA Special Papers
Published: 01 July 2008
DOI: 10.1130/2008.442(10)
... adjacent Wrangellia ( Jones et al., 1977 ). Study of Late Triassic biofacies and associated paleoecology reveals new silicified shallow-water corals and other fossils from new and previously known localities within the Alexander terrane (Keku Strait and Gravina Island, southeast Alaska...
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Series: GSA Special Papers
Published: 01 January 1995
DOI: 10.1130/SPE296-p51
... The western metamorphic belt is part of the Coast plutonic-metamorphic complex of western Canada and southeastern Alaska that developed during collision of the Alexander terrane and Gravina assemblage on the west against the Yukon Prong and Stikine terranes to the east. Deformation...
Journal Article
Published: 01 June 1991
Canadian Journal of Earth Sciences (1991) 28 (6): 929-938.
...M. L. Crawford; W. A. Crawford Abstract The western metamorphic belt of the British Columbia – Alaska coastal orogen consists of lithostratigraphic units assigned to the Taku terrane and the Gravina sequence. On Revillagigedo Island and Cleveland Peninsula in the Ketchikan quadrangle...