Heat flow and mineralogy of TAG relict high-temperature hydrothermal zones

Mid-Atlantic Ridge 26°N, 45°W

Peter A. Rona, Sven Petersen, Keir Becker, Richard P. Von Herzen, Mark D. Hannington, Peter M. Herzig, J. Naka, C. Lalou, G. Thompson

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Submersible investigations employing heat flow measurements (12 stations), sampling and imagery of the two relict high-temperature hydrothermal zones of the TAG field, the Alvin and Mir sulfide zones, elucidate relations between heat sources and mineralization including an active sulfide mound that has been the focus of prior studies. Values of heat flow in the Mir zone and at the margin of the active mound are inversely proportional to distance from adjacent volcanic centers. This observation supports the hypothesis that intrusions at volcanic centers adjacent to the high-temperature hydrothermal zones supply the heat to drive hydrothermal activity. The chronology of hydrothermal deposits in the different zones indicates that the intrusions are episodic with field-wide high-temperature hydrothermal events recurring at intervals of tens of thousands of years, while activity at individual zones may recur at intervals of hundreds to thousands of years. A sequence of hydrothermal deposits ranges to at least 140,000 years ago from massive sulfides forming at the active mound, to recrystallization of sulfides in the active and relict zones, to pyritization of an inactive mound in the Alvin zone; low-temperature mineral phases precipitate before, during and after the sulfides.

Original languageEnglish (US)
Pages (from-to)3507-3510
Number of pages4
JournalGeophysical Research Letters
Volume23
Issue number23
StatePublished - 1996

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mineralogy
heat transmission
heat flow
sulfides
ridges
intrusion
sulfide
volcanology
hydrothermal deposit
deposits
intervals
chronology
flow measurement
heat sources
imagery
precipitates
margins
stations
sampling
minerals

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Rona, P. A., Petersen, S., Becker, K., Von Herzen, R. P., Hannington, M. D., Herzig, P. M., ... Thompson, G. (1996). Heat flow and mineralogy of TAG relict high-temperature hydrothermal zones: Mid-Atlantic Ridge 26°N, 45°W. Geophysical Research Letters, 23(23), 3507-3510.

Heat flow and mineralogy of TAG relict high-temperature hydrothermal zones : Mid-Atlantic Ridge 26°N, 45°W. / Rona, Peter A.; Petersen, Sven; Becker, Keir; Von Herzen, Richard P.; Hannington, Mark D.; Herzig, Peter M.; Naka, J.; Lalou, C.; Thompson, G.

In: Geophysical Research Letters, Vol. 23, No. 23, 1996, p. 3507-3510.

Research output: Contribution to journalArticle

Rona, PA, Petersen, S, Becker, K, Von Herzen, RP, Hannington, MD, Herzig, PM, Naka, J, Lalou, C & Thompson, G 1996, 'Heat flow and mineralogy of TAG relict high-temperature hydrothermal zones: Mid-Atlantic Ridge 26°N, 45°W', Geophysical Research Letters, vol. 23, no. 23, pp. 3507-3510.
Rona, Peter A. ; Petersen, Sven ; Becker, Keir ; Von Herzen, Richard P. ; Hannington, Mark D. ; Herzig, Peter M. ; Naka, J. ; Lalou, C. ; Thompson, G. / Heat flow and mineralogy of TAG relict high-temperature hydrothermal zones : Mid-Atlantic Ridge 26°N, 45°W. In: Geophysical Research Letters. 1996 ; Vol. 23, No. 23. pp. 3507-3510.
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