| Abstract: | Four dredge hauls from near the crest and from the eastern flank of the seismically active Mid-Indian Ocean Ridge at 23?? to 24??S, at depths of 3700 to 4300 meters, produced only low-potassium tholeiitic basalt similar in chemical and mineralogic composition to basalts characteristic of ridges and rises in the Atlantic and Pacific oceansA fifth haul, from a depth of 4000 meters on the lower flank of a seamount on the ocean side of the Indonesian Trench, recovered tholeiitic basalt with higher concentrations of K and Ti and slightly lower amounts of Si and Ca than the typical oceanic tholeiite of the ridgeThe last sample is vesicular, suggesting depression of the area since the basalt was emplacedMany of the rocks dredged are variously decomposed and hydrated, but there is no evidence of important chemical modification toward conversion of the lava flows to spilite during extrusion or solidification. |
| Genre: | Article |
| ProdID: | 70010808 |
| Citation Author: | Engel, C. G.; Fischer, R. L.; Engel, A. E. J. |
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| Citation End Page: | 610 |
| Citation Issue: | 3696 |
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| Citation Language: | English |
| Citation Larger Work Title: | Science |
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| Citation Number Of Pages: | 6 |
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| Citation Search Results Text: | Igneous rocks of the Indian ocean floor; 1965; Article; Journal; Science; Engel, C. G.; Fischer, R. L.; Engel, A. E. J. |
| Citation Start Page: | 605 |
| Citation Volume: | 150 |
| Citation Year: | 1965 |
| Type: | citation/reference |
| Text: | Igneous rocks of the Indian ocean floor; 1965; Article; Journal; Science; Engel, C. G.; Fischer, R. L.; Engel, A. E. J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Fri, 1 Jan 1965 00:00 -0600 |
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