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Mineral inclusions in diamonds: associations and chemical distinctions around the 670-km discontinuity

Mineral inclusions in diamonds: associations and chemical distinctions around the 670-km discontinuity
Mineral inclusions in diamonds: associations and chemical distinctions around the 670-km discontinuity
Three new mineral associations have been discovered within diamonds from the Juina district of Brazil. These include a previously unrecorded NaAl-(Mg, Fe)SiO3 phase associated with ferroperidase and the tetragonal almandine pyrope phase, TAPP. Also reported are an association of corundum with aluminous-pyroxene and an olivine composition phase associated with ferroperidase. The minerals in each association often occurred within the same diamonds in addition to being recovered from individual diamonds in different combinations. High-pressure experimental data indicate that these associations formed at different depths within a region ca. 60 km on either side of the upper-mantle/lower-mantle boundary. Mineral compositions show that for the regions sampled, the deep transition zone and lower mantle are chemically distinct and inhomogeneous. Importantly, in the shallow lower mantle, Al is not solely accommodated within perovskite-structured (Mg, Fe)SiO3 as some recent experimental studies have suggested.
lower-mantle, convection, constraints, abundances, perovskite, chemistry, garnet
0010-7999
119-126
Hutchison, M.
3cd10b99-47fa-4298-9342-06827d85e1b4
Hursthouse, M.
7f04f4c9-f92d-44a5-ace2-9a32e7f1abe9
Light, M.
cf57314e-6856-491b-a8d2-2dffc452e161
Hutchison, M.
3cd10b99-47fa-4298-9342-06827d85e1b4
Hursthouse, M.
7f04f4c9-f92d-44a5-ace2-9a32e7f1abe9
Light, M.
cf57314e-6856-491b-a8d2-2dffc452e161

Hutchison, M., Hursthouse, M. and Light, M. (2001) Mineral inclusions in diamonds: associations and chemical distinctions around the 670-km discontinuity. Contributions to Mineralogy and Petrology, 142 (1), 119-126. (doi:10.1007/s004100100279).

Record type: Article

Abstract

Three new mineral associations have been discovered within diamonds from the Juina district of Brazil. These include a previously unrecorded NaAl-(Mg, Fe)SiO3 phase associated with ferroperidase and the tetragonal almandine pyrope phase, TAPP. Also reported are an association of corundum with aluminous-pyroxene and an olivine composition phase associated with ferroperidase. The minerals in each association often occurred within the same diamonds in addition to being recovered from individual diamonds in different combinations. High-pressure experimental data indicate that these associations formed at different depths within a region ca. 60 km on either side of the upper-mantle/lower-mantle boundary. Mineral compositions show that for the regions sampled, the deep transition zone and lower mantle are chemically distinct and inhomogeneous. Importantly, in the shallow lower mantle, Al is not solely accommodated within perovskite-structured (Mg, Fe)SiO3 as some recent experimental studies have suggested.

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More information

Published date: 1 October 2001
Keywords: lower-mantle, convection, constraints, abundances, perovskite, chemistry, garnet

Identifiers

Local EPrints ID: 19529
URI: http://eprints.soton.ac.uk/id/eprint/19529
ISSN: 0010-7999
PURE UUID: 7f2573b5-cfbb-4a3b-a407-97a985e8b264
ORCID for M. Light: ORCID iD orcid.org/0000-0002-0585-0843

Catalogue record

Date deposited: 15 Feb 2006
Last modified: 19 Nov 2019 01:53

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