QUENTIN C. WILLIAMS Professor of Earth & Planetary Sciences Mineral Physics, Experimental Geochemistry
		Office: EMS A212 Phone: 831-459-3132 Fax: 831-459-3074 E-mail: qwilliams@es.ucsc.edu Lab: C431/C483 x9-2596 x9-5355		For more information: • Website • Publications (PDF)

Education and Training

B.A., Princeton University
Ph.D., University of California, Berkeley

Research Interests

The Earth's mantle and core comprise more than 99 percent of the mass of the planet. As such, the physical and chemical properties of these regions are critical in determining the processes by which the planet has evolved to its current state. Quentin Williams's research is centered on experimentally examining the structural and thermodynamic properties of minerals, melts, and fluids at both ambient and high pressures. In particular, the melting relations of deep Earth materials, the ability of deep Earth minerals (and melts) to retain water and carbon dioxide, the mineralogy of subduction zone materials, and the structural constraints that determine whether silicate magmas buoyantly rise or sink at different depths in the Earth are among his primary interests. Such properties not only control the thermal regime in the deep Earth (and thus the driving force of plate tectonics), but also are vital in determining the mechanisms and degree to which the planet has differentiated.

The principal tool Williams uses to study these problems is the high-temperature diamond anvil cell, a device by which pressures corresponding to those present throughout the deep Earth may be generated. Because of the transparency of diamond, probes such as Raman spectroscopy are used to examine the bonding properties of materials in situ at simultaneous high pressure and temperature. Such data yield insight into the local bonding environments of ions in crystals, melts, and solutions, and the changes in these environments with pressure and temperature.

Teaching Interests

Evolution of the Earth | Thermochemistry of Geologic Systems | Comparative Planetology | Topics in Chemistry and Physics of the Earth