| 2174 |
Creator |
1c5c32b11b5ad1bd9c846a77784abc38 |
| 2174 |
Creator |
ext-5b577dc12fd3de8d0da84ecb3fc9ffa0 |
| 2174 |
Creator |
ext-c34313a631fede7dbb7040ef3de6fa33 |
| 2174 |
Creator |
ext-44b2f4a495d8050a1e6d145fc6a336eb |
| 2174 |
Creator |
ext-7c6b1fc475cb95c1c7c033e092b356c5 |
| 2174 |
Date |
2004-09 |
| 2174 |
Is Part Of |
p00244937 |
| 2174 |
Is Part Of |
repository |
| 2174 |
abstract |
We have performed dissections of two diamondiferous eclogites (UX-1 and U33/1) from
the Udachnaya kimberlite, Yakutia in order to understand the nature of diamond formation
and the relationship between the diamonds, their mineral inclusions, and host eclogite
minerals. Diamonds were carefully recovered from each xenolith, based upon high-resolution
X-ray tomography images and three-dimensional models. The nature and physical properties
of minerals, in direct contact with diamonds, were investigated at the time of diamond
extraction. Polished sections of the eclogites were made, containing the mould areas
of the diamonds, to further investigate the chemical compositions of the host minerals
and the phases that were in contact with diamonds. Major- and minor-element compositions
of silicate and sulfide mineral inclusions in diamonds show variations among each
other, and from those in the host eclogites. Oxygen isotope compositions of one garnet
and five clinopyroxene inclusions in diamonds from another Udachnaya eclogite (U51)
span the entire range recorded for eclogite xenoliths from Udachnaya. In addition,
the reported compositions of almost all clinopyroxene inclusions in U51 diamonds exhibit
positive Eu anomaly. This feature, together with the oxygen isotopic characteristics,
is consistent with the well-established hypothesis of subduction origin for Udachnaya
eclogite xenoliths. It is intuitive to expect that all eclogite xenoliths in a particular
kimberlite should have common heritage, at least with respect to their included diamonds.
However, the variation in the composition of
multiple inclusions within diamonds, and among diamonds, from the same eclogite indicates
the involvement of complex
processes in diamond genesis, at least in the eclogite xenoliths from Yakutia that
we have studied. |
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authorList |
authors |
| 2174 |
issue |
1-4 |
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status |
peerReviewed |
| 2174 |
volume |
77 |
| 2174 |
type |
AcademicArticle |
| 2174 |
type |
Article |
| 2174 |
label |
Anand, Mahesh ; Taylor, Lawrence A.; Misra, Kula C.; Carlson, William D. and Sobolev,
Nikolai V. (2004). Nature of diamonds in Yakutian eclogites: views from eclogite
tomography and mineral inclusions in diamonds. Lithos, 77(1-4) pp. 333–348.
|
| 2174 |
label |
Anand, Mahesh ; Taylor, Lawrence A.; Misra, Kula C.; Carlson, William D. and Sobolev,
Nikolai V. (2004). Nature of diamonds in Yakutian eclogites: views from eclogite
tomography and mineral inclusions in diamonds. Lithos, 77(1-4) pp. 333–348. |
| 2174 |
Title |
Nature of diamonds in Yakutian eclogites: views from eclogite tomography and mineral
inclusions in diamonds |
| 2174 |
in dataset |
oro |