Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4716928 | Lithos | 2010 | 15 Pages |
Abstract
Microstructural observations combined with P-T pseudosection analysis show that dehydration partial melting occurred in the kyanite-field. After reaching peak conditions at about 820 °C, 13 kbar, the studied sample experienced decompression accompanied by cooling down to 805 °C, 10 kbar, which caused in situ melt crystallization. SHRIMP monazite and zircon geochronology provides evidence that the anatexis affecting the upper portion of the MCTZ occurred during Early Oligocene (â¼Â 31 Ma). These results demonstrate that in the upper MCTZ, at least in the eastern Himalaya, crustal anatexis was earlier than, and not a consequence of, decompression linked to exhumation along the MCT.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
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Authors
Chiara Groppo, Daniela Rubatto, Franco Rolfo, Bruno Lombardo,