Journal
ANNUAL REVIEW OF EARTH AND PLANETARY SCIENCES, VOL 43
Volume 43, Issue -, Pages 105-138Publisher
ANNUAL REVIEWS
DOI: 10.1146/annurev-earth-060614-105215
Keywords
high-pressure/low-temperature rocks; fluid-mediated transport; serpentinite melange; subduction processes
Funding
- Division Of Earth Sciences
- Directorate For Geosciences [1119403] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [24403010] Funding Source: KAKEN
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Jadeitite is a relatively rare, very tough rock composed predominantly of jadeite and typically found associated with tectonic blocks of high-pressure/low-temperature metabasaltic rocks (e.g., eclogite, blueschist) in exhumed serpentinite-matrix melanges. Studies over the past similar to 20 years have interpreted jadeitite either as the direct hydrous fluid precipitate from subduction channel dewatering into the overlying mantle wedge or as the metasomatic replacement by such fluids of oceanic plagiogranite, graywacke, or metabasite along the channel margin. Thus, jadeitites directly sample and record fluid transport in the subduction factory and provide a window into this geochemical process that is critical to a major process in the Earth system. They record the remarkable transport of large ion lithophile elements, such as Li, Ba, Sr, and Pb, as well as elements generally considered more refractory, such as U, Th, Zr, and Hf. Jadeitite is also the precious form of jade, utilized since antiquity in the form of tools, adornments, and symbols of prestige.
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