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

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Science  11 May 1979:
Vol. 204, Issue 4393, pp. 613-616
DOI: 10.1126/science.204.4393.613


The Galápagos 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.