Ocean plateau-seamount origin of basaltic rocks, Angayucham terrane, central Alaska
January 1, 1988
The Angayucham terrane of north-central Alaska (immediately S of the Brooks Range) is a large (ca. 500 km E-W), allochthonous complex of Devonian to Lower Jurassic pillow basalt, diabase sills, gabbro plutons, and chert. The mafic rocks are transitional normal-to-enriched, mid-ocean-ridge (MORB) type tholeiites (TiO2 1.2-3.4%, Nb 7-23 ppm, Ta 0.24-1.08 ppm, Zr 69-214 ppm, and light REE's slightly depleted to moderately enriched). Geologic and geochemical constraints indicate that Angayucham terrane is the upper "skin' (ca. 3-4 km thick) of a long-lived (ca. 170-200 ma) oceanic plateau whose basaltic-gabbroic rocks are like those of seamounts of the East Pacific Rise. -Authors
Citation Information
Publication Year | 1988 |
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Title | Ocean plateau-seamount origin of basaltic rocks, Angayucham terrane, central Alaska |
Authors | F. Barker, D. L. Jones, J. R. Budahn, P.J. Coney |
Publication Type | Article |
Publication Subtype | Journal Article |
Series Title | Journal of Geology |
Index ID | 70014429 |
Record Source | USGS Publications Warehouse |