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Galapagos Hydrothermal Mounds : Stratigraphy and Chemistry Revealed by Deep-Sea Drilling

Natland, James H. / Rosendhal, Bruce / Hekinian, Roger / Dmitriev, Yuri / Fodor, Ronald V. / Goll, Robert M. / Hoffert, Michel / Humphris, Susan E. / Mattey, David P. / Peterson, Nikolai / Roggenthen, William / Schrader, Edward L. / Srivasiava, Ramesh K. / Warren, Nick - 1979
The Galapagos mounds sea-floor hydrothermal system is at least 300,000 years old and once produced manganese-poor sediments, which nearly blanketed the area of the present mounds field. Present-day mound deposits are limited manganese-rich exposures, suggesting that the system has changed from rock- to water-dominated and has diminished in intensity with time. [NOT CONTROLLED OCR]

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