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Mid-Ocean Ridges: Hydrothermal Interactions between the Lithosphere and Oceans. CHRISTOPHER R. GERMAN, JIAN LIN, AND LINDSAY M. PARSON, EDITORS. Pp. 318. American Geophysical Union, Monograph Series 148. 2004. ISBN 0-87590-413-0. Price US$49.00.

This volume of 13 papers focuses on the interaction of magmatic heat, tectonic deformation, and sea-floor hydrothermal circulation, with an emphasis on slow-spreading ridges. As with other AGU monographs in a series dedicated to midocean ridges and submarine hydrothermal vents (e.g., Monograph 91 on Seafloor Hydrothermal Systems, Monograph 106 on Faulting and Magmatism at Mid-Ocean Ridges, and Monograph 144 on The Subseafloor Biosphere at Mid-Ocean Ridges), this volume gives an up-to-date review of work on the magmatism, tectonism, and hydrothermal activity along the midocean ridges.

Chapter 1, by German and Lin, reviews ridge spreading and hydrothermal circulation for fast- and slow-spreading ridges. The authors highlight the difficulty in accounting for the heat budget to form hydrothermal mounds like TAG or Rainbow along the Mid-Atlantic Ridge when invoking upper crustal heat sources that may include episodic magmatic pulses. They speculate that serpentinization and more deeply seated heat in the oceanic crust must play a role. The next chapter, by Sinha and Evans, provides a well-illustrated review of the thermal aspects of oceanic . . . [Full Text of this Article]