The deep structure of a sea-floor hydrothermal deposit
Nature
By: R.A. Zierenberg, Y. Fouquet, D. J. Miller, J.M. Bahr, P.A. Baker, T. Bjerkgard, C.A. Brunner, R.C. Duckworth, R. Gable, J. Gieskes, W.D. Goodfellow, H. M. Groschel-Becker, G. Guerin, J. Ishibashi, G. Iturrino, R.H. James, K.S. Lackschewitz, L.L. Marquez, P. Nehlig, J.M. Peter, C.A. Rigsby, P. Schultheiss, Wayne C. Shanks III, Bernd R. T. Simoneit, M. Summit, D.A.H. Teagle, M. Urbat, and G.G. Zuffa
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Abstract
Hydrothermal circulation at the crests of mid-ocean ridges plays an important role in transferring heat from the interior of the Earth. A consequence of this hydrothermal circulation is the formation of metallic ore bodies known as volcanic-associated massive sulphide deposits. Such deposits, preserved on land, were important sources of copper for ancient civilizations and continue to provide a significant source of base metals (for example, copper and zinc). Here we present results from Ocean Drilling Program Leg 169, which drilled through a massive sulphide deposit on the northern Juan de Fuca spreading centre and penetrated the hydrothermal feeder zone through which the metal-rich fluids reached the sea floor. We found that the style of feeder-zone mineralization changes with depth in response to changes in the pore pressure of the hydrothermal fluids and discovered a stratified zone of high-grade copper-rich replacement mineralization below the massive sulphide deposit. This copper-rich zone represents a type of mineralization not previously observed below sea-floor deposits, and may provide new targets for land-based mineral exploration.
Suggested Citation
Zierenberg, R., Fouquet, Y., Miller, D.J., Bahr, J., Baker, P., Bjerkgard, T., Brunner, C., Duckworth, R., Gable, R., Gieskes, J., Goodfellow, W., Groschel-Becker, H.M., Guerin, G., Ishibashi, J., Iturrino, G., James, R., Lackschewitz, K., Marquez, L., Nehlig, P., Peter, J., Rigsby, C., Schultheiss, P., Shanks, W.C., Simoneit, B.R., Summit, M., Teagle, D., Urbat, M., and Zuffa, G., 1998, The deep structure of a sea-floor hydrothermal deposit: Nature, v. 392, no. 6675, p. 485-488, https://doi.org/10.1038/33126.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | The deep structure of a sea-floor hydrothermal deposit |
| Series title | Nature |
| DOI | 10.1038/33126 |
| Volume | 392 |
| Issue | 6675 |
| Year Published | 1998 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Nature |
| First page | 485 |
| Last page | 488 |