A high-temperature hydrothermal deposit on the seabed at a gulf of California spreading center |
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| Authors: | PF Lonsdale JL Bischoff VM Burns M Kastner RE Sweeney |
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| Institution: | 1. Marine Physical Laboratory, Scripps Institution of Oceanography, La Jolla, CA 92093 U.S.A.;2. U.S. Geological Survey, Menlo Park, CA 94025 U.S.A.;3. Department of Earth and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139 U.S.A.;4. Geological Research Division, Scripps Institution of Oceanography, La Jolla, CA 92093 U.S.A.;5. Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90024 U.S.A. |
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| Abstract: | A submersible dive on a turbidite-covered spreading axis in Guaymas Basin photographed and sampled extensive terraces and ledges of talc. The rock contains siliceous microfossils, smectite, and euhedral pyrrhotite as well as rather pure iron-rich talc. Sulfur and oxygen isotopes indicate precipitation around a hydrothermal vent, at about 280°C. |
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