Ancient continental margin assemblage in the northern Coast Mountains, southeast Alaska and northwest Canada

Journal Article · Wed Feb 28 23:00:00 EST 1990 · Geology; (USA)

DOI:https://doi.org/10.1130/0091-7613(1990)018<0208:ACMAIT>2.3.CO;2· OSTI ID:6314645

Gehrels, G E; McClelland, W C; Samson, S D; Pathcett, P J; Jackson, J L ^[1]

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1. Univ. of Arizona, Tucson (USA)

Geologic relations indicate that quartz-rich metasedimentary rocks in the northern Coast Mountains separate strata to the east that belong to the Stikine terrane from strata to the west of the Alexander, Wrangellia, and Taku terranes. The quartz-rich rocks structurally overlie western terranes along a mid-Cretaceous thrust fault and are overlain structurally (originally stratigraphically ) by strata of the Stikine terrace. These rocks are interpreted to be a continental margin assemblage that belongs to the Yukon Crystalline terrane. U-Pb and Nd isotopic data indicate that the metasedimentary rocks were shed from a source terrane consisting at least in part of Proterozoic rocks.

• OSTI ID: 6314645
• Journal Information: Geology; (USA), Journal Name: Geology; (USA) Vol. 18:3; ISSN GLGYB; ISSN 0091-7613
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
ACTINIDE ISOTOPES
ALASKA
CANADA
CHALCOGENIDES
CHEMISTRY
CRETACEOUS PERIOD
FEDERAL REGION X
GEOCHEMISTRY
GEOLOGIC AGES
GEOLOGIC HISTORY
GEOLOGIC MODELS
GEOLOGIC STRATA
GEOLOGIC STRUCTURES
GEOLOGY
ISOTOPE RATIO
ISOTOPES
LEAD ISOTOPES
MESOZOIC ERA
METAMORPHIC ROCKS
MINERALS
MOUNTAINS
NEODYMIUM ISOTOPES
NORTH AMERICA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PRECAMBRIAN ERA
QUARTZ
ROCKS
SEDIMENTARY BASINS
SEDIMENTARY ROCKS
SEDIMENTATION
SILICON COMPOUNDS
SILICON OXIDES
STRATIGRAPHY
TECTONICS
URANIUM ISOTOPES
USA