File:Jadeitite, Jurassic, Burma.jpg
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English: Jadeitite close-up (~2.2 cm across) from the Jurassic of Burma. Jadeitite (= jadeite jade) is a rare metamorphic rock composed of jadeite pyroxene (Na(Al,Fe)(Si2O6)). Published research on Burmese jade generally indicates that the jadeitite rock masses formed by metasomatism of albitites (= plagioclase feldspar metamorphites) at the periphery of serpentinized mantle peridotite bodies. The mantle peridotite was part of a subducting slab of Mesozoic-aged oceanic lithosphere that was emplaced upward and against southeast Asian continental lithosphere by obduction.
Geologic unit: Hpakan-Tawmaw Jade Tract, Hpakan Ultramafic Body, Naga-Adaman Ophiolite. Metamorphic age: late Tithonian Stage, near-latest Jurassic, 147 m.y. Locality: alluvial clast (placer jade) from unrecorded locality (possibly in the vicinity of Phakant), upper reaches of the Uyu River (Uru River), western Kachin State, Indo-Burma Range, northern Burma. Photo from & info. synthesized by James St. John (School of Earth Sciences, Ohio State University at Newark; Newark, Ohio, USA). |
| Date | |
| Source | Own work |
| Author | James St. John |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 22:38, 13 January 2012 | | 852 × 659 (70 KB) | James St. John (talk | contribs) |
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