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Basalts and serpentinite from the Puerto Rico Trench, 1. Petrology |
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| Authors: | Fumiko Shido Akiho Miy Ashiro Maurice Ewing |
| Institution: | 1. Department of Geological Sciences, State University of New York at Albany, Albany, N.Y. U.S.A.;2. The Marine Biomedical Institute, The University of Texas at Galveston, Galveston, Texas U.S.A. |
| Abstract: | Typical abyssal tholeiites occur on both north and south walls of the Puerto Rico Trench. Probably they were erupted in the Mid-Atlantic Ridge in Cretaceous time and afterwards were moved to the present position. In addition, doleritic basalts containing phenocrysts of pigeonite rimmed by augite were found from the north wall, and these rocks presumably represent a new type of abyssal tholeiites characterized by ratios lower than those of ordinary abyssal tholeiites.A new analysis of serpentinite from the north wall is also recorded here. |
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