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Ocean plateau-seamount origin of basaltic rocks, Angayucham terrane, central Alaska

Journal of Geology

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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

Additional Publication Details

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
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Geology
First page:
368
Last page:
374
Number of Pages:
7