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Submarine extension of the southwest rift zone of Mauna Loa Volcano, Hawaii; visual observations from U. S. Navy deep submergence vehicle DSV Sea Cliff
D. J. Fornari, D. W. Peterson, J. P. Lockwood, A. Malahoff and B. C. Heezen
Submarine extension of the southwest rift zone of Mauna Loa Volcano, Hawaii; visual observations from U. S. Navy deep submergence vehicle DSV Sea Cliff
Geological Society of America Bulletin (May 1979) 90 (5): 435-443
Submarine extension of the southwest rift zone of Mauna Loa Volcano, Hawaii; visual observations from U. S. Navy deep submergence vehicle DSV Sea Cliff
Geological Society of America Bulletin (May 1979) 90 (5): 435-443
Index Terms/Descriptors
- basalts
- bottom features
- columnar joints
- data
- dikes
- East Pacific Ocean Islands
- extent
- fractures
- geochemistry
- geophysical methods
- geophysical surveys
- Hawaii
- igneous rocks
- intrusions
- lava
- major elements
- marine environment
- Mauna Loa
- North Pacific
- observations
- ocean floors
- Oceania
- oceanography
- Pacific Ocean
- photogeology
- Polynesia
- rift zones
- seismic methods
- submarine environment
- submersibles
- surveys
- tholeiite
- United States
- volcanic rocks
- volcanoes
- volcanology
Latitude & Longitude
Abstract
North-south-trending dikes exhibiting well-developed columnar jointing have been visually observed on a series of submersible dives to the submarine extension of the southwest rift zone of Mauna Loa Volcano, Hawaii. These dikes are exposed along a west-facing 1,900-m-high scarp that is the sea-floor expression of the southwest rift zone. They form prominent walls, 10 to 60 m high and 1 to 3 m thick at their crests, separated by sediment- and rubble-mantled benches. The talus at the base of each dike consists of faceted blocks of basalt broken from the face of the wall. Major-element analyses of samples collected in situ show the rocks to be of "normal" Mauna Loa tholeiite composition
ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 90
Serial Issue: 5
Title: Submarine extension of the southwest rift zone of Mauna Loa Volcano, Hawaii; visual observations from U. S. Navy deep submergence vehicle DSV Sea Cliff
Affiliation: Lamont-Doherty Geol. Obs.,
Palisades, N.Y.,
United States
Pages: 435-443
Published: 197905
Text Language: English
Publisher: Geological Society of America (GSA),
Boulder, CO,
United States
Accession Number: 1979-022892
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Lamont-Doherty Geol. Obs.; Contrib. No. 2761
Illustration Description: illus. incl. table, sketch maps
N19°19'60" - N19°34'60", W155°40'00" - W155°19'60"
N18°19'60" - N19°10'00", W156°10'00" - W155°30'00"
Secondary Affiliation: U. S. Geol. Surv.,
USA,
United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from U. S. Geological Survey, Hawaiian Volcano Observatory, , United States
Update Code: 1979
