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Gravina Island

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Journal Article
Published: 01 March 2008
Journal of Paleontology (2008) 82 (2): 344–350.
... the Cordilleran terranes and cratonal North America do not typically contain reeflike buildups, hypercalcifying sponge-like organisms were noted as occurring as part of the intricate paleoecological structure within a biostrome along the western shoreline of Gravina Island, southeast Alaska (southern Alexander...
FIGURES
Series: GSA Special Papers
Published: 01 July 2008
DOI: 10.1130/2008.442(10)
... 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) and Wrangellia (Wrangell Mountains, Alaska...
FIGURES | View All (26)
Journal Article
Published: 01 May 1987
Canadian Journal of Earth Sciences (1987) 24 (5): 866–881.
...George E. Gehrels; Jason B. Saleeby; Henry C. Berg Abstract Geologic mapping, U–Pb (zircon) geochronometry, and conodont studies indicate that the major pre-Jurassic assemblages on Annette, Gravina, Duke, and adjacent smaller islands include pre-Middle Ordovician metavolcanic and metasedimentary...
Series: Geological Society, London, Special Publications, 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...
FIGURES | View All (27)
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
Journal: AAPG Bulletin
Published: 01 April 2001
AAPG Bulletin (2001) 85 (4): 661–689.
... and graben structures in the foreland controlled the distribution of basins, islands, and straits ( Figure 2 ) and, consequently, the depositional characteristics of the Calcarenite di Gravina Formation ( Iannone and Pieri, 1979 ). During middle-late Pleistocene uplift of the Apulian foreland ( Ciaranfi et...
FIGURES | View All (12)
Journal Article
Published: 01 February 2018
Italian Journal of Geosciences (2018) 137 (1): 3–15.
...Vincenzo Festa; Luisa Sabato; Marcello Tropeano ABSTRACT Along the slopes of the “Gravina di Matera” canyon, below and in front of the “Sassi di Matera”, i.e. , the old Matera town (Basilicata, southern Italy), an about 200 m thick succession of upper Cretaceous carbonates extensively crops out...
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Journal Article
Published: 01 March 1992
Canadian Journal of Earth Sciences (1992) 29 (3): 506–522.
... of intrusive activity the Gravina basin began to close by regional thrust faulting, which in the Duke Island region was west-northwest directed. The intrusion may have still had local intercumulate liquid upon initiation of thrust faulting. It responded first by open folding with incipient crystal plasticity...
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...
Journal Article
Published: 24 September 2018
Canadian Journal of Earth Sciences (2019) 56 (1): 77–100.
... Mountains sequence corroborates this interpretation. The Gravina belt comprises the Seymour Canal Formation ( Fig. 2 ), Douglas Island Volcanics and Brothers Volcanics, and the Treadwell Formation ( Gehrels 2000 ). The Seymor Canal Formation is ∼1800 m thick and consists of sandstone and mudstone...
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Series: Economic Geology Monograph Series, Economic Geology Monograph Series
Published: 01 January 1997
DOI: 10.5382/Mono.09.02
EISBN: 9781629490045
... Abstract Lithoteetonic terranes thot are now the northwestern eoms of North America record more than 500 m.y. of ore-forming processes. Almost all of Alaska’s mineral deposits older than 150 Ma knuicd in oceanic environments in blocks of oceanic crust island areas, or isolated continental...
Journal Article
Published: 01 June 1991
Canadian Journal of Earth Sciences (1991) 28 (6): 840–853.
... that the crust thickens from about 20 to 40 km from southwest to northeast. Ultramafic bodies in the Chugach, Alexander, and Wrangellia terranes and Gravina assemblage underlie local highs. Most of the accumulated seismic strain is released by large earthquakes on the Fairweather – Queen Charlotte Islands plate...
Journal Article
Journal: GSA Bulletin
Published: 01 October 1990
GSA Bulletin (1990) 102 (10): 1378–1392.
... on the Clarence Strait fault. The Duncan Canal shear zone extends southward to the Mosman Inlet region on Etolin Island where it projects beneath Jura-Cretaceous Gravina strata. In Duncan Canal and Mosman Inlet, the shear zone evolved within the Alexander terrane and does not coincide with any recognized terrane...
Image
A.  Upper Pliocene-Pleistocene Calcarenite di <b>Gravina</b> deposits on the Mater...
Published: 01 April 2001
as a result of a punctuated transgression. C. The upper member of the Calcarenite di Gravina is bioclastic and represents the downslope accumulation of skeletal debris shed off the isolated platform, which resulted from partial submersion of the Matera paleo-island. D. Later drowning and/or deposition
Journal Article
Published: 31 October 2001
Canadian Journal of Earth Sciences (2001) 38 (11): 1579–1599.
... sources that are slightly younger than the ∼ 175 Ma Moffat volcanics underlying the clastic sequence. Similarities in protolith and provenance with strata on Whitesand Island and in southeast Alaska suggest that these metasedimentary rocks belong to the Gravina belt (or Venn sequence; Crawford et al...
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Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2007.2431(06)
... to the south is the major Wrangellia island arc composite terrane, and to the north is the major Yukon-Tanana metamorphosed continental margin terrane. Overlying mainly the northern margin of the Wrangellia composite terrane are the Kahiltna overlap assemblage to the west, and the Gravina-Nutzotin-Gambier...
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
Journal: GSA Bulletin
Published: 01 June 1991
GSA Bulletin (1991) 103 (6): 829–841.
...R. D. COOK; M. L. CRAWFORD; G. I. OMAR; W. A. CRAWFORD Abstract The mid-Cretaceous, cale-alkaline, LREE-enriched plutons on southern Revillagigedo Island, southeastern Alaska, form two distinct groups: (1) biotite-epidote-hornblende tonalite of the Moth Bay pluton and (2) biotite-bearing...
Series: DNAG, Geology of North America
Published: 01 January 1994
DOI: 10.1130/DNAG-GNA-G1.621
EISBN: 9780813754536
... Cretaceous time (Berg and others, 1972). The locally voluminous volcanic rocks within that assemblage are probably the extrusive equivalents of island-arc intrusive rocks, which are preserved west of the Gravina belt over a large area in northern southeastern Alaska (Brew and Morrell, 1983). Neither...
Journal Article
Published: 27 January 2004
Canadian Journal of Earth Sciences (2004) 41 (1): 87–102.
..., which is the same direction as the stretching lineation direction in Gravina belt rocks inferred to have formed just prior to pluton emplacement ( Haeussler 1992 ). On southwestern Mitkof Island, in the margin of one of the plutons, there are sills of tonalite with mafic enclaves that are parallel...
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