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Abstract
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
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Ocean plateau-seamount origin of basaltic rocks, Angayucham terrane, central Alaska |
| Series title | Journal of Geology |
| Volume | 96 |
| Issue | 3 |
| Year Published | 1988 |
| Language | English |
| Publisher | University of Chicago Press |
| Description | 7 p. |
| First page | 368 |
| Last page | 374 |
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