Very high-pressure orogenic garnet peridotites
-
Edited by Russell J. Hemley, Carnegie Institution of Washington, Washington, DC, and approved January 4, 2007 (received for review August 23, 2006)
-
Fig. 1.P–T conditions of VHP mafic–ultramafic rocks. (Left) (A), P–T fields of VHP metamorphism, “forbidden-zone” (17), and stability of coesite and diamond; (B), P–T time paths for Dabie–Sulu eclogite and garnet peridotites. (Right) Zoned zircon domains with SHRIMP U–Pb ages for Sulu paragneiss.
-
Fig. 2.Distribution and peak metamorphic ages of recognized VHP terranes worldwide (modified after ref. 27).
-
Fig. 3.A schematic model for Triassic subduction of the Yangtze beneath the Sino-Korean cratons, showing the tectonic setting for mantle-derived (type A) and crustal-hosted (type B) garnet peridotites (for details, see ref. 2).
-
Fig. 4.Microstructures of VHP minerals. (A) Exsolution lamellae of garnet plus ilmenite in relict clinopyroxene from Sulu peridotite (for details, see ref. 14). (B and C) Exsolution lamellae of rutile plus amphibole in peridotite garnet from northern Qaidam VHP terrane (for details, see ref. 62).
-
Fig. 5.Phase transformations in enstatite. (Upper) TEM image of enstatite with clinoenstatite lamellae from Sulu garnet peridotite. (Lower) P–T path for such transformation. (For details, see ref. 12.)
-
Fig. 6.Schematic P–X (Cpx–Grt) diagram for isothermal decompression path of majoritic garnet to form garnet plus ilmenite lamellae in clinopyroxene host (Fig. 4 A) (for details, see ref. 14).
Footnotes
- *To whom correspondence should be addressed. E-mail: liou{at}pangea.stanford.edu
- © 2007 by The National Academy of Sciences of the USA
