Recovery of an oxidized majorite inclusion from Earth's deep asthenosphere
Genre
Journal ArticleDate
2017-04Author
Xu, ChengKynicky, Jindrich
Tao, Renbiao
Liu, Xi
Zhang, Lifei
Pohanka, Miroslav
Song, Wenlei
Fei, Yingwei
Subject
Mantle petrologyeclogite xenoliths
high-pressure experiment
mantle asthenosphere
mantle convection
mantle majorite
Permanent link to this record
http://hdl.handle.net/20.500.12613/4914
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10.1126/sciadv.1601589Abstract
Minerals recovered from the deep mantle provide a rare glimpse into deep Earth processes. We report the first discovery of ferric iron-rich majoritic garnet found as inclusions in a host garnet within an eclogite xenolith originating in the deep mantle. The composition of the host garnet indicates an ultrahigh-pressure metamorphic origin, probably at a depth of ~200 km. More importantly, the ferric iron-rich majoritic garnet inclusions show a much deeper origin, at least at a depth of 380 km. The majoritic nature of the inclusions is confirmed by mineral chemistry, x-ray diffraction, and Raman spectroscopy, and their depth of origin is constrained by a new experimental calibration. The unique relationship between the majoritic inclusions and their host garnet has important implications for mantle dynamics within the deep asthenosphere. The high ferric iron content of the inclusions provides insights into the oxidation state of the deep upper mantle.Citation to related work
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http://dx.doi.org/10.34944/dspace/4896