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Igneous Rocks of the Indian Ocean Floor
Science (New York, N.Y.)
|October 29, 1965
Summary
Low-potassium tholeiitic basalt from the Mid-Indian Ocean Ridge matches Atlantic and Pacific samples. A nearby seamount yielded different tholeiitic basalt, possibly indicating recent depression.
Area of Science:
- Marine geology and geochemistry
- Oceanic volcanism
Background:
- Mid-Indian Ocean Ridge volcanism
- Oceanic basalt composition
Purpose of the Study:
- Characterize basalt from the Mid-Indian Ocean Ridge and a nearby seamount.
- Compare findings to global oceanic basalt data.
Main Methods:
- Dredge hauls for rock samples
- Chemical and mineralogic analysis of basalts
Main Results:
- Low-potassium tholeiitic basalt found on the Mid-Indian Ocean Ridge is similar to Atlantic and Pacific basalts.
- Tholeiitic basalt from a nearby seamount shows higher K and Ti, and lower Si and Ca.
- Vesicular texture in one sample suggests post-emplacement depression.
Conclusions:
- Basaltic rocks from the Mid-Indian Ocean Ridge are chemically similar to those found in other major ocean basins.
- Geochemical variations in basalt near the Indonesian Trench may indicate localized tectonic activity.
- No evidence of spilitization was observed, suggesting limited post-emplacement alteration.
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