Abstract
Loihi seamount, an active submarine volcano situated about 30 km south of the island of Hawaii, is the youngest manifestation of the hotspot responsible for the Emperor–Hawaiian seamount chain and Hawaiian islands. This seamount has been the focus of numerous studies characterizing the geophysical, geochemical and biological features of an active intraplate volcano1,2,3,4,5,6,7,8,9,10,11,12,13,14. In July–August 1996, Loihi seamount experienced the most intense period of seismic activity yet recorded for any Hawaiian volcano1. Within two months of the ‘seismic crisis’, summit and flank hydrothermal vent fluids were collected using a manned submersible. Here we report data from these samples that indicate large and systematic changes in the CO2/3He ratios of the vent fluids compared to pre-seismic-crisis values2,3. These changes are consistent with an abrupt transition from alkalic to tholeiitic basaltic magma having supplied volatiles to the vents. This rapid change in magma chemistry has been discernible only through CO2/3He monitoring, and suggests that the anticipated evolution of the Hawaiian plume to a phase of shield-building tholeiitic magmatism is highly episodic at Loihi and not yet complete.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Duennebier, F. K. et al. Researchers rapidly respond to submarine activity at Loihi volcano, Hawaii. Eos 78, 229–233 (1997).
Craig, H., Welhan, J. A. & Hilton, D. R. Hydrothermal vents in Loihi caldera: Alvin results. Eos 68, 1553 (1987).
Sedwick, P., McMurtry, G. M., Hilton, D. R. & Goff, F. Carbon dioxide and helium in hydrothermal fluids from Loihi Seamount, Hawaii, USA: Temporal variability and implications for the release of mantle volatiles. Geochim. Cosmochim. Acta 58, 1219–1227 (1994).
Sedwick, P., McMurtry, G. M. & Macdougall, J. D. Chemistry of hydrothermal solutions from Pele's Vents, Loihi Seamount, Hawaii. Geochim. Cosmochim. Acta 56, 3643–3667 (1992).
Garcia, M. O. et al. Petrology and geochronology of basalt breccia from the 1996 earthquake swarm of Loihi Seamount, Hawaii: magmatic history of its 1996 eruption. Bull. Volcanol. 59, 577–592 (1998).
Rison, W. & Craig, H. Helium isotopes and mantle volatiles in Loihi Seamount and Hawaiian Island basalts and xenoliths. Earth Planet. Sci. Lett. 66, 407–426 (1983).
Kurz, M. D., Jenkins, W. J., Hart, S. R. & Clague, D. A. Helium isotopic variations in volcanic rocks from Loihi Seamount and the Island of Hawaii. Earth Planet. Sci. Lett. 66, 388–406 (1983).
Valbracht, P. J., Staudigel, H., Honda, M., McDougall, I. & Davies, G. R. Isotopic tracing of volcanic source regions from Hawaii: decoupling of gaseous from lithophile magma components. Earth Planet. Sci. Lett. 144, 185–198 (1996).
Moore, J. G., Clague, D. A. & Normark, W. R. Diverse basalt types from Loihi Seamount. Geology 10, 88–92 (1982).
Garcia, M. O., Jorgenson, B., Mahoney, J. J., Ito, E. & Irving, A. J. An evaluation of temporal geochemical evolution of Loihi summit lavas: Results from Alvin submersible dives. J. Geophys. Res. 98, 537–550 (1993).
Garcia, M. O., Foss, D. J. P., West, W. B. & Mahoney, J. J. Geochemical and isotopic evolution of Loihi volcano, Hawaii. J. Petrol. 26, 1647–1674 (1995).
Malahoff, A., McMurtry, G. M., Wiltshire, J. C. & Yeh, H.-W. Geology and chemistry of hydrothermal deposits from active submarine volcano Loihi, Hawaii. Nature 298, 234–239 (1982).
Karl, D., McMurtry, G. M., Malahoff, A. & Garcia, M. Loihi Seamount, Hawaii: A mid-plate volcano with a distinctive hydrothermal system. Nature 335, 532–535 (1988).
Moyer, C. L., Dobbs, F. C. & Karl, D. M. Estimation of diversity and community structure through restriction fragment length polymorphism distribution analysis of bacterial 16S rRNA genes from amicrobial mat at an active, hydrothermal vent system, Loihi Seamount, Hawaii. Appl. Environ. Microbiol. 60, 871–879 (1994).
Craig, H. & Lupton, J. E. in The SeaVol. 7 (ed. Emiliani, C.) 391–428 (Wiley, New York, 1981).
Cohen, A. S., O'Nions, R. K. & Kurz, M. D. Chemical and isotopic variations in Mauna Loa tholeiites. Earth Planet. Sci. Lett. 143, 111–124 (1996).
Marty, B. & Jambon, A. C/3He in volatile fluxes from the solid Earth: Implications for carbon geodynamics. Earth Planet. Sci. Lett. 83, 16–26 (1987).
Trull, T., Nadeau, S., Pineau, F., Polve, M. & Javoy, M. C-He systematics in hotspot xenoliths: Implications for mantle carbon contents and carbon recycling. Earth Planet. Sci. Lett. 118, 43–64 (1993).
Hilton, D. R., McMurtry, G. M. & Kreulen, R. Evidence for extensive degassing of the Hawaiian mantle plume from helium-carbon relationships at Kilauea volcano. Geophys. Res. Lett. 24, 3065–3068 (1997).
Dixon, J. E., Stolper, E. M. & Holloway, J. R. An experimental study of water and carbon dioxide solubilities in mid-ocean ridge basaltic liquids. Part I: Calibration and solubility models. J. Petrol. 36, 1607–1631 (1995).
Jendrzejewski, N., Trull, T. W., Pineau, F. & Javoy, M. Carbon solubility in mid-ocean ridge basaltic melt at low pressures (250-1950 bar). Chem. Geol. 138, 81–92 (1997).
Jambon, A., Weber, H. & Braun, O. Solubility of He, Ne, Ar, Kr and Xe in a basalt melt in the range 1250–1600 °C. Geochemical implications. Geochim. Cosmochim. Acta 50, 401–408 (1986).
Lux, G. The behavior of noble gases in silicate liquids: Solution, diffusion, bubbles and surface effects, with applications to natural samples. Geochim. Cosmochim. Acta 51, 1549–1560 (1987).
Dixon, J. E. Degassing of alkalic basalts. Am. Mineral. 82, 368–378 (1997).
Frey, F. A. & Clague, D. A. Geochemistry of diverse basalt types from Loihi Seamount, Hawaii: petrogenetic implications. Earth Planet. Sci. Lett. 66, 337–355 (1983).
Frey, F. A. & Rhodes, J. M. Intershield geochemical differences among Hawaiian volcanoes: implications for source compositions, melting process and magma ascent paths. Phil. Trans. R. Soc. Lond. A 342, 121–136 (1993).
Guillou, H., Garcia, M. O. & Turpin, L. Unspiked K-Ar dating of young volcanic rocks from the Loihi and Pitcairn seamounts. J. Volcanol. Geotherm. Res. 78, 239–250 (1997).
Von Damm, K. L. et al. Chemistry of submarine hydrothermal solutions at 21 degrees N, East Pacific Rise. Geochim. Cosmochim. Acta 49, 2197–2220. Ozima, M. & Podosek, F. A. Noble Gas Geochemistry (Cambridge Univ. Press, 1983).
Exley, R. A., Mattey, D. P., Clague, D. A. & Pillinger, C. T. Carbon isotope systematics of a mantle “hotspot”: a comparison of Loihi Seamount and MORB glasses. Earth Planet. Sci. Lett. 78, 189–199 (1986).
Acknowledgements
We thank F. Duennebier and J. R. Smith for Fig. 1, and B. Eakins, M. Cremer and D.Counce for laboratory assistance. We also thank T. Kerby and the HURL operations staff forhelp at sea. Discussions with M. O. Garcia and C. G. Macpherson proved very helpful. This work was funded by the NOAA Sea Grant College and National Undersea Research Programs (to G.M.M.) and SIO “start-up” funds (to D.R.H.).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Hilton, D., McMurtry, G. & Goff, F. Large variations in vent fluid CO2/3He ratios signal rapid changes in magma chemistry at Loihi seamount, Hawaii. Nature 396, 359–362 (1998). https://doi.org/10.1038/24603
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1038/24603
This article is cited by
-
Sediment Microbial Diversity of Three Deep-Sea Hydrothermal Vents Southwest of the Azores
Microbial Ecology (2017)
-
The 2012–2016 eruptive cycle at Copahue volcano (Argentina) versus the peripheral gas manifestations: hints from the chemical and isotopic features of fumarolic fluids
Bulletin of Volcanology (2017)
-
Kolumbo submarine volcano (Greece): An active window into the Aegean subduction system
Scientific Reports (2016)
-
Non-equilibrium degassing and a primordial source for helium in ocean-island volcanism
Nature (2007)
-
300-Myr-old magmatic CO2 in natural gas reservoirs of the west Texas Permian basin
Nature (2001)
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.