South Arch volcanic field—Newly identified young lava flows on the sea floor south of the Hawaiian Ridge
Geology
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Abstract
Several young lava fields were imaged by GLORIA sidescan sonar along the Hawaiian Arch south of Hawaii. The largest, 35 by 50 km across, includes a central area characterized by high sonar backscatter and composed of several flow lobes radiating from a vent area. Reflection profiling and sea-floor photography indicate that the central lobes are flat sheet flows bounded by pillowed margins; thin surface sediment and thin palagonite rinds on lava surfaces suggest ages of 1-10 ka. Vents are localized along the arch crest near bases of Cretaceous seamounts. Two dredged flows are basanite and alkalic basalt, broadly similar to rejuvenated-stage and some pre-shield alkalic lavas on the Hawaiian Ridge. Arch volcanism represents peripheral leakage of melt from the Hawaiian hot spot over much larger areas than previously recognized. -Authors
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | South Arch volcanic field—Newly identified young lava flows on the sea floor south of the Hawaiian Ridge |
| Series title | Geology |
| DOI | 10.1130/0091-7613(1989)017<0611:SAVFNI>2.3.CO;2 |
| Volume | 17 |
| Issue | 7 |
| Year Published | 1989 |
| Language | English |
| Publisher | Geological Society of America |
| Contributing office(s) | Volcano Science Center |
| Description | 4 p. |
| First page | 611 |
| Last page | 614 |
| Country | United States |
| Other Geospatial | Hawaiian Ridge |
| Google Analytic Metrics | Metrics page |