Colebrook Island

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Journal Article
Published: 01 April 1994
Micropaleontology (1994) 40 (2): 157-168.
Journal Article
Journal: AAPG Bulletin
Published: 01 January 1966
AAPG Bulletin (1966) 50 (1): 25-71.
...John G. Koch ABSTRACT During Nevadan orogenesis ( ca . 145 m.y. ago), the Galice(?) Formation was regionally metamorphosed (greenschist facies) to phyllites and schists of the Colebrooke Formation, the Pearse Peak Diorite was emplaced, and the Port Orford-Gold Beach area, Oregon, underwent intense...
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Journal Article
Journal: Geosphere
Published: 01 April 2008
Geosphere (2008) 4 (2): 329-353.
..., intraoceanic island arcs attached to the continental margin by Jurassic arc-continent collision, and subduction complexes associated with the flanks of the exotic island arcs. Systematic analysis of areal relations and geochronological data displayed on subregional geologic maps and summary chronostratigraphic...
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Series: GSA Special Papers
Published: 01 January 2006
DOI: 10.1130/2006.2410(08)
... hydrothermal metamorphic assemblages, all consistent with it being a sheeted dike complex of an ophiolite. Magmatic affinities of the dikes are transitional island-arc tholeiite (IAT) to mid-ocean ridge basalt (MORB) and boninitic, similar to the Josephine ophiolite that underlies the Galice Formation...
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Series: Geological Society, London, Memoirs
Published: 01 January 2017
EISBN: 9781786203007
..., and uncoated pumice clasts from the Central Indian Ocean basin (CIOB) and Inglis and Colebrook islands. In any volcanic or volcanogenic rock, Na 2 O content should always be greater than K 2 O. The values for pumice clasts, glass shards and acid differentiates for samples P, Q, R, S, AD–AJ are consistent...
Series: GSA Special Papers
Published: 01 January 2006
DOI: 10.1130/2006.2410(09)
... rifting of a composite island-arc complex and was subsequently thrust over the margin of western North America during the Nevadan orogeny ( Saleeby et al., 1982 ; Harper and Wright, 1984 ; Wyld and Wright, 1988 ; Saleeby, 1992 ; Harper et al., 1994 ). The tectonic setting for the origin of the Coast...
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Series: GSA Special Papers
Published: 01 January 2006
DOI: 10.1130/2006.2410(01)
... Klamath Mountains province, Ernst (1999) supported the supra-subduction- zone interpretation. However, Ernst and his coworkers found that North Fork metabasaltic rocks in the Sawyers Bar area consisted of island-arc basalt (IAB) and ocean island basalt (OIB), which in turn suggest that the North Fork...
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Journal Article
Published: 01 April 2007
Scottish Journal of Geology (2007) 43 (1): 33-40.
... is of the ‘Brookeborough’ diamond, found in the Colebrook River, Co. Fermanagh in Northern Ireland in 1816. ( Ball 1887 ). Found by a pearl-fisher, it was said to be ‘slightly tinged with yellow’ and ‘not quite so large as swan-shot’ and worth 20 guineas as rough. Despite occasional scepticism as to the existence...
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Journal Article
Journal: AAPG Bulletin
Published: 01 April 1944
AAPG Bulletin (1944) 28 (4): 449-521.
... to the Abrams and Salmon schists of northern California and the Colebrook schists of southwestern Oregon; these are known to be pre-Silurian in age. He regards the Sur series as either very early Paleozoic or pre-Cambrian. The Franciscan-Knoxville group is younger than the Sur series and the Santa Lucia...
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Journal Article
Published: 01 January 2016
Journal of Micropalaeontology (2016) 35 (1): 26-53.
FIGURES | View All (13)