Textural and chemical zoning in garnets related to mantle metasomatism anddeformation processes

Authors
Zhang, HF Menzies, MA Zhou, XH Lu, FX
Citation
Hf. Zhang et al., Textural and chemical zoning in garnets related to mantle metasomatism anddeformation processes, CHIN SCI B, 45(2), 2000, pp. 174-180
Citations number
20
Categorie Soggetti
Multidisciplinary
Journal title
CHINESE SCIENCE BULLETIN
ISSN journal
10016538 → ACNP
Volume
45
Issue
2
Year of publication
2000
Pages
174 - 180
Database
ISI
SICI code
1001-6538(200001)45:2<174:TACZIG>2.0.ZU;2-P
Abstract
A few texturally-zoned garnets were found in a polymict peridotite (JJG1414 ) from the Cretaceous kimberlite, Kimberley, South Africa. The systematic a nalyses of electron and ion microprobe as well as laser fluorination techni que reveal the existencal of marked elemental and oxygen isotopic zonation in these garnets, corresponding to the textural zonation. The rims are norm ally enriched in Ca, Ti, Cr, LREE, Sr, Nb, and depleted in Mg, Al and O-18. It is demonstrated that these garnets were infiltrated by melts/fluids, pr obably representing the disequilibrated products of fluid-assisted mantle d eformation.