@Article{Hacker:2000, author = {B.R. Hacker and E. Gnos and L. Ratschbacher and M. Grove and M. McWilliams and S.V. Sobolev and W. Jiang and W. Zhenhan }, title={Hot and dry deep crustal xenoliths from {T}ibet}, journal={Science}, year={2000}, volume={287}, number={}, month={Mar}, pages={2463--2466}, note={}, annote={}, keywords={}, url={http://sims.ess.ucla.edu/PDF/hacker_et_al_2000.pdf}, doi={10.1126/science.287.5462.2463}, abstract={Anhydrous metasedimentary and mafic xenoliths entrained in 3-million-year-old shoshonitic lavas of the central Tibetan Plateau record a thermal gradient reaching about 800$^{\circ}$C to 1000$^{\circ}$C at a depth of 30 to 50 kilometers; just before extraction, these same xenoliths were heated as much as 200$^{\circ}$C. Although these rocks show that the central Tibetan crust is hot enough to cause even dehydration melting of mica, the absence of hydrous minerals, and the match of our calculated P-wave speeds and Poisson's ratios with seismological observations, argue against the presence of widespread crustal melting.} }