| Abstract: | Quaternary basanites were recovered from the continental margin of the Bering Sea near Navarin Basin. The basanites are highly vesicular flow rock and hyaloclastites similar to other alkalic volcanic rocks erupted repeatedly during the last Cenozoic on islands in the Bering Sea region and in mainland Alaska. K-Ar ages for the basanites indicate at least two episodes of volcanism at about 1.1 and 0.4 Ma. Trace-element data indicate these alkalic lavas have been generated by small, but variable, amounts of partial melting of a metasomatized lherzolite source. The relativley primitive compositions (MgO >9%), presence of mantle-derived xenoliths in some alkalic lavas, and presence of forsteritic olivine with low CaO and high NiO suggest that magma rose rapidly from great depth without spending time in large, long-lived magma chambers. Alkalic volcanism apparently resulted from upwelling and decompressional melting of small isolated mantle diapirs in response to local lithospheric attenuation associated with jostling of blocks during adjustment to regional stresses. -from Authors |
| Genre: | Article |
| ProdID: | 70017868 |
| Citation Author: | Davis, A. S.; Gunn, S. H.; Gray, L. -B.; Marlow, M. S.; Wong, F. L. |
| Citation Contributing Office: | |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | |
| Citation Editor: | |
| Citation End Page: | 984 |
| Citation Issue: | 5 |
| Citation Keywords: | |
| Citation Language: | English |
| Citation Larger Work Title: | Canadian Journal of Earth Sciences |
| Citation LatN: | |
| Citation LatS: | |
| Citation LonE: | |
| Citation LonW: | |
| Citation Month: | |
| Citation No Pagination: | |
| Citation Number Of Pages: | 10 |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | |
| Citation Series: | |
| Citation Series Code: | |
| Citation Series Number: | |
| Citation Search Results Text: | Petrology and isotopic composition of Quaternary basanites dredged from the Bering Sea continental margin near Navarin Basin; 1993; Article; Journal; Canadian Journal of Earth Sciences; Davis, A. S.; Gunn, S. H.; Gray, L. -B.; Marlow, M. S.; Wong, F. L. |
| Citation Start Page: | 975 |
| Citation Volume: | 30 |
| Citation Year: | 1993 |
| Type: | citation/reference |
| Text: | Petrology and isotopic composition of Quaternary basanites dredged from the Bering Sea continental margin near Navarin Basin; 1993; Article; Journal; Canadian Journal of Earth Sciences; Davis, A. S.; Gunn, S. H.; Gray, L. -B.; Marlow, M. S.; Wong, F. L. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Fri, 1 Jan 1993 00:00 -0600 |
| Publisher: | |
