Skip to Main Content
Book Chapter

Interstitial Water and Hydrothermal Water Chemistry, Guaymas Basin, Gulf of California

By
Joris M. Gieskes
Joris M. Gieskes
Scripps Institution of Oceanography University of California, San Diego La Jolla, California, U.S.A.
Search for other works by this author on:
Timothy Shaw
Timothy Shaw
Scripps Institution of Oceanography University of California, San Diego La Jolla, California, U.S.A.
Search for other works by this author on:
Thomas Brown
Thomas Brown
Scripps Institution of Oceanography University of California, San Diego La Jolla, California, U.S.A.
Search for other works by this author on:
Ann Sturz
Ann Sturz
Scripps Institution of Oceanography University of California, San Diego La Jolla, California, U.S.A.
Search for other works by this author on:
Andrew C. Campbell
Andrew C. Campbell
Department of Earth, Atmospheric and Planetary Sciences Massachusetts Institute of Technology Cambridge, Massachusetts, U.S.A.
Search for other works by this author on:
Published:
January 01, 1991

Abstract

Hydrothermal activity in the Guaymas Basin occurs in a setting quite different from that on open ocean ridges, in that new oceanic basement forms underneath a thick blanket of rapidly deposited sediments. In this report we discuss the geochemical aspects of this system, and give particular attention to studies of interstitial waters, sediments, and the geochemistry of the overlying water column.

Evidence from Deep Sea Drilling Project sites allows us to distinguish two types of hydrothermal systems: one is associated with shallow sill intrusions, leading to hydrothermal activity of short duration and sediment temperatures not exceeding ~200°C; the other is associated with deep-seated massive intrusions or hot lavas, whose temperatures commonly exceed 300° C, and with high-temperature alteration of sediments to greenschist facies. The latter system is of long duration, long enough to allow alteration of substantial thicknesses of sediments. Hydrothermal fluids are channelled toward fault zones by overlying sill intrusions, as well as by near-surface layers of dolomite (as noted in piston cores) or cemented diatom frustules (observed in Alvin push cores), and reach the sea floor at temperatures as high as 325°C. Finally, hydrothermal fluids exit the sediment directly or through hydrothermal mounds and chimneys, and constitute 0.1% of the basin subsill water mass; these fluids leave distinct imprints of anomalies in dissolved silica, excess He, barium and beryllium, and particulate manganese.

You do not currently have access to this article.

Figures & Tables

Contents

AAPG Memoir

The Gulf and Peninsular Province of the Californias

J. Paul Dauphin
J. Paul Dauphin
Search for other works by this author on:
Bernd R. T. Simoneit
Bernd R. T. Simoneit
Search for other works by this author on:
American Association of Petroleum Geologists
Volume
47
ISBN electronic:
9781629811130
Publication date:
January 01, 1991

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal