FN Archimer Export Format PT J TI Galapagos Hydrothermal Mounds : Stratigraphy and Chemistry Revealed by Deep-Sea Drilling BT AF 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 AS 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;14:; FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;14:; TC 0 UR https://archimer.ifremer.fr/doc/1979/publication-5382.pdf LA English DT Article DE ;Histoire Ifremer AB 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] PY 1979 SO Science PU American Association for the Advancement of Science VL 204 IS 4393 BP 613 EP 616 ID 5382 ER EF