| 2183 |
Creator |
1c5c32b11b5ad1bd9c846a77784abc38 |
| 2183 |
Creator |
ext-190a12e0d9e58b6a57bbb86b783cb1c2 |
| 2183 |
Creator |
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| 2183 |
Creator |
ext-4deb0d93da0cc3dfe34c1dfce59e7b1f |
| 2183 |
Creator |
ext-56c368bb643874b3193c229556d0248e |
| 2183 |
Creator |
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| 2183 |
Creator |
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| 2183 |
Creator |
ext-de83224f5512445cc1632248a249cee6 |
| 2183 |
Date |
2003 |
| 2183 |
Is Part Of |
p00107999 |
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Is Part Of |
repository |
| 2183 |
abstract |
Mantle xenoliths from the Obnazhennaya kimberlite pipe, Yakutia, possess a large range
of mineralogical and chemical compositions, from both group A and B eclogites. Major-element
contents of the group A eclogites exhibit transitional features between the group
B eclogites and peridotite. The Mg# of clinopyroxenes is 0.86–0.94, with 0.60–0.84
for garnets. Differences in concentration of LREEs exist between the Obnazhennaya
group A and the well-studied group B eclogites from the Udachnaya kimberlite pipe.
In general, garnets in the group A eclogites contain lower LREEs than those from the
group B eclogites; however, the trend for clinopyroxene is reversed. High d 18O (5.46–7.81)
values, and the positive Eu anomalies in the garnets and clinopyroxenes (Eu/Eu* 1.2–1.4)
demonstrate the involvement of an oceanic crustal component in the formation of the
group A eclogites. The group A eclogites formed between 21.0 and 37.6 kbar, and 711
and 923 °C, in a time interval of 1,071–1,237 Ma. An innovative model is proposed
to explain the formation of the group A eclogites and websterites. It involves the
reaction of a depleted mantle peridotite with TTG and carbonatite melts closely related
to the subduction of oceanic crust. |
| 2183 |
authorList |
authors |
| 2183 |
issue |
4 |
| 2183 |
status |
peerReviewed |
| 2183 |
volume |
145 |
| 2183 |
type |
AcademicArticle |
| 2183 |
type |
Article |
| 2183 |
label |
Taylor, Lawrence A.; Snyder, Gregory A.; Keller, Randall; Remley, David A.; Anand,
Mahesh ; Wiesli, Rene; Valley, John and Sobolev, Nikolai V. (2003). Petrogenesis
of group A eclogites and websterites: evidence from the Obnazhennaya kimberlite, Yakutia.
Contributions to Mineralogy and Petrology, 145(4) pp. 424–443. |
| 2183 |
label |
Taylor, Lawrence A.; Snyder, Gregory A.; Keller, Randall; Remley, David A.; Anand,
Mahesh ; Wiesli, Rene; Valley, John and Sobolev, Nikolai V. (2003). Petrogenesis
of group A eclogites and websterites: evidence from the Obnazhennaya kimberlite, Yakutia.
Contributions to Mineralogy and Petrology, 145(4) pp. 424–443. |
| 2183 |
Title |
Petrogenesis of group A eclogites and websterites: evidence from the Obnazhennaya
kimberlite, Yakutia |
| 2183 |
in dataset |
oro |