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Creator |
1c5c32b11b5ad1bd9c846a77784abc38 |
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Creator |
ext-647ef92576fc3f49256079785d3e0a1c |
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Creator |
ext-8366097234b472c7fdd07df67e936316 |
| 2182 |
Creator |
ext-a0c53f08f3e154c1683b77911cb7da45 |
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Creator |
ext-db70bee3bdd0bbde5514bb34b98c30b9 |
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Date |
2003-06 |
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Is Part Of |
repository |
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Is Part Of |
p0003004X |
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abstract |
Large diamonds (10–200 carats) from Udachnaya, Mir, and Aikhal kimberlite pipes of
Yakutia
contain variable mineral inclusions typical of diamonds of smaller size. Among these
inclusions,
extracted from outer portions of these diamonds, the majority are garnets of harzburgitic
paragenesis,
with a small number of inclusions belonging to lherzolitic and eclogitic groups, in
addition to
chromite diamond inclusions (DIs). The most striking feature of the garnet DIs is
the sinusoidal rareearth
elements (REE) patterns observed for all harzburgitic, and some lherzolitic garnets,
whereas
eclogitic garnets form normal LREE-depleted patterns. These sinusoidal REE patterns
are indicative
of a complex petrogenesis for the garnets, involving partial-melting, followed by
metasomatic enrichment,
particularly of the LREEs/MREEs. The metasomatic agents were probably not those of
carbonatitic fluids, but rather C-O-H-N-S fluids, as indicated by the negative anomalies
of Ba and Sr
in the garnets.
The general axiom among investigators that most, if not all, DIs are syngenetic with
their diamonds
is seriously questioned. The petrogenetic history of the harzburgitic garnet DIs involved
complex
processing prior to their diamond encapsulation. That is, the garnet DIs retained
a signature of
their earlier, pre-diamond encapsulation history. This result is taken as proof that
basically all
harzburgitic garnet DIs are non-syngenetic (i.e., protogenetic) with their host diamonds. |
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authorList |
authors |
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issue |
5-6 |
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status |
peerReviewed |
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volume |
88 |
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type |
AcademicArticle |
| 2182 |
type |
Article |
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label |
Taylor, Lawrence A.; Anand, Mahesh ; Promprated, Prinya; Floss, Christine and Sobolev,
Nikolai V. (2003). The significance of mineral inclusions in large diamonds from
Yakutia, Russia. American Mineralogist, 88(5-6) pp. 912–920. |
| 2182 |
label |
Taylor, Lawrence A.; Anand, Mahesh ; Promprated, Prinya; Floss, Christine and Sobolev,
Nikolai V. (2003). The significance of mineral inclusions in large diamonds from
Yakutia, Russia. American Mineralogist, 88(5-6) pp. 912–920. |
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Title |
The significance of mineral inclusions in large diamonds from Yakutia, Russia |
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in dataset |
oro |