Hydrothermal mounds and young ocean crust of the Galapagos: Preliminary Deep Sea Drilling results, Leg 70

Jose Honnorez, Richard P. Von Herzen, Timothy J. Barrett, Keir Becker, Michael L. Bender, Peter E. Borella, Hans Wolfgang Hubberten, Steven C. Jones, Shun'ichiro Karato, Christine Laverne, Shaul Levi, Areg A. Migdisov, S. Anthony Moorby, Ed L. Schrader

Research output: Contribution to journalArticle

48 Scopus citations

Abstract

A total of 32 holes at 5 sites near 1°N, 86°W drilled on Deep Sea Drilling Project (DSDP) Leg 70 (November-December 1979) provide unique data on the origin of the hydrothermal mounds on the south flank of the Galapagos spreading center. Hydrothermal sediments, primarily Mn-oxide and nontronite, are restricted to the immediate vicinity of the mounds (≤100 m) and are probably formed by the interaction of upward-percolating hydrothermal solutions with sea water and pelagic sediments above locally permeable zones of ocean crust. Mounds as much as 25 m in height form in less than a few × 10 5 yrs, and geothermal and geochemical gradients indicate that they are actively forming today. The lack of alteration of upper basement rocks directly below the mounds and throughout the Galapagos region indicates that the source of the hydrothermal solutions is deeper in the crust.

Original languageEnglish (US)
Pages (from-to)457-472
Number of pages16
JournalBulletin of the Geological Society of America
Volume92
Issue number7
DOIs
StatePublished - Jan 1 1981
Externally publishedYes

ASJC Scopus subject areas

  • Geology

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    Honnorez, J., Von Herzen, R. P., Barrett, T. J., Becker, K., Bender, M. L., Borella, P. E., Hubberten, H. W., Jones, S. C., Karato, S., Laverne, C., Levi, S., Migdisov, A. A., Moorby, S. A., & Schrader, E. L. (1981). Hydrothermal mounds and young ocean crust of the Galapagos: Preliminary Deep Sea Drilling results, Leg 70. Bulletin of the Geological Society of America, 92(7), 457-472. https://doi.org/10.1130/0016-7606(1981)92<457:HMAYOC>2.0.CO;2