Late miocene/pliocene origin of the inverted metamorphism of the Central Himalaya [electronic resource].
- Arlington, Va. : National Science Foundation (U.S.), 1997.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- 14 pages : digital, PDF file
- Additional Creators:
- Lawrence Livermore National Laboratory
National Science Foundation (U.S.)
United States. Department of Energy. Office of Scientific and Technical Information
- The spatial association of intracontinental thrusting and inverted metamorphism, recognized in the Himalaya more than a century ago, has inspired continuing efforts to identify their causal relationship. Perhaps the best known sequence of inverted metamorphism is that found immediately beneath the Himalayan Main Central Thrust (MCT), generally thought to have been active during the Early Miocene. It has been widely assumed that the pattern of inverted metamorphism also developed at that time. Using a new approach, in situ Th-Pb dating of monazite included in garnet, we have discovered that the peak metamorphic recrystallization recorded in the footwall of the MCT fault occurred at ca. 5 Ma. The apparent inverted metamorphism resulted from activation of a broad shear zone beneath the MCT zone which juxtaposed two right-way-up metamorphic sequences. Recognition of this remarkably youthful phase of metamorphism resolves outstanding problems in Himalayan tectonics, such as why the MCT (and not the more recently initiated thrusts) marks the break in slope of the present day mountain range, and transcends others, such as the need for exceptional conditions to explain Himalayan anatexis.
- Published through SciTech Connect.
Annual meeting and exposition of the Geological Society of America, Inc.: earth systems summit, Denver, CO (United States), 28-31 Oct 1996.
Harrison, T.M.; Ryerson, F.J.; LeFort, P.; Yin, A. Lovera, O.M.
- Funding Information:
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