Multi-stage metasomatism of diamondiferous eclogite xenoliths from the Udachnaya kimberlite pipe, Yakutia, Siberia
The primary garnet (pyrope-almandine)-omphacite (Cpx 1, 6.5–7 wt% Na2O)-sulfide (Fe-Ni-Co mss) assemblage of the two diamondiferous eclogite xenoliths studied (U33/1 and UX/1) experienced two mantle metasomatic events. The metasomatic event I is recorded by the formation of platy phlogopite ( 10 wt%...
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ftopenunivgb:oai:oro.open.ac.uk:2178 2024-06-23T07:57:26+00:00 Multi-stage metasomatism of diamondiferous eclogite xenoliths from the Udachnaya kimberlite pipe, Yakutia, Siberia Misra, Kula C. Anand, Mahesh Taylor, Lawrence A. Sobolev, Nikolai V. 2004-02 https://oro.open.ac.uk/2178/ unknown Misra, Kula C.; Anand, Mahesh <https://oro.open.ac.uk/view/person/ma3776.html>; Taylor, Lawrence A. and Sobolev, Nikolai V. (2004). Multi-stage metasomatism of diamondiferous eclogite xenoliths from the Udachnaya kimberlite pipe, Yakutia, Siberia. Contributions to Mineralogy and Petrology, 146(6) pp. 696–714. Journal Item PeerReviewed 2004 ftopenunivgb 2024-05-29T00:44:15Z The primary garnet (pyrope-almandine)-omphacite (Cpx 1, 6.5–7 wt% Na2O)-sulfide (Fe-Ni-Co mss) assemblage of the two diamondiferous eclogite xenoliths studied (U33/1 and UX/1) experienced two mantle metasomatic events. The metasomatic event I is recorded by the formation of platy phlogopite ( 10 wt% K2O), prior to incorporation of the xenoliths in the kimberlite. The bulk of the metasomatic alteration, consisting of spongy-textured clinopyroxene (Cpx 2A, 1–3 wt% Na2O), coarser-grained clinopyroxene (Cpx 2B, 2–5 wt% Na2O), pargasitic amphibole ( 0.8 wt% K2O; 3–3.5 wt% Na2O), kelyphite (Cpx 3, mostly <1 wt% Na2O; and zoned Mg-Fe-Al spinel), sodalite, calcite, K-feldspar, djerfisherite (K5.95Na0.02Fe18.72Ni2.36Co0.01Cu4.08S26Cl ) and a small amount of K-Ca-Fe-Mg glass, is ascribed to the metasomatic event II that occurred also in the upper mantle, but after the xenoliths were incorporated in the kimberlite. A pervasive chloritic alteration (mainly clinochlore + magnetite) that overprints earlier assemblages probably took place in the upper crustal environment. The diamonds are invariably associated with secondary clinopyroxene and chlorite, but the diamonds formed before the entrainment of the xenoliths in the Udachnaya kimberlite. Article in Journal/Newspaper Yakutia Siberia The Open University: Open Research Online (ORO) Contributions to Mineralogy and Petrology 146 6 696 714 |
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Open Polar |
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The Open University: Open Research Online (ORO) |
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description |
The primary garnet (pyrope-almandine)-omphacite (Cpx 1, 6.5–7 wt% Na2O)-sulfide (Fe-Ni-Co mss) assemblage of the two diamondiferous eclogite xenoliths studied (U33/1 and UX/1) experienced two mantle metasomatic events. The metasomatic event I is recorded by the formation of platy phlogopite ( 10 wt% K2O), prior to incorporation of the xenoliths in the kimberlite. The bulk of the metasomatic alteration, consisting of spongy-textured clinopyroxene (Cpx 2A, 1–3 wt% Na2O), coarser-grained clinopyroxene (Cpx 2B, 2–5 wt% Na2O), pargasitic amphibole ( 0.8 wt% K2O; 3–3.5 wt% Na2O), kelyphite (Cpx 3, mostly <1 wt% Na2O; and zoned Mg-Fe-Al spinel), sodalite, calcite, K-feldspar, djerfisherite (K5.95Na0.02Fe18.72Ni2.36Co0.01Cu4.08S26Cl ) and a small amount of K-Ca-Fe-Mg glass, is ascribed to the metasomatic event II that occurred also in the upper mantle, but after the xenoliths were incorporated in the kimberlite. A pervasive chloritic alteration (mainly clinochlore + magnetite) that overprints earlier assemblages probably took place in the upper crustal environment. The diamonds are invariably associated with secondary clinopyroxene and chlorite, but the diamonds formed before the entrainment of the xenoliths in the Udachnaya kimberlite. |
format |
Article in Journal/Newspaper |
author |
Misra, Kula C. Anand, Mahesh Taylor, Lawrence A. Sobolev, Nikolai V. |
spellingShingle |
Misra, Kula C. Anand, Mahesh Taylor, Lawrence A. Sobolev, Nikolai V. Multi-stage metasomatism of diamondiferous eclogite xenoliths from the Udachnaya kimberlite pipe, Yakutia, Siberia |
author_facet |
Misra, Kula C. Anand, Mahesh Taylor, Lawrence A. Sobolev, Nikolai V. |
author_sort |
Misra, Kula C. |
title |
Multi-stage metasomatism of diamondiferous eclogite xenoliths from the Udachnaya kimberlite pipe, Yakutia, Siberia |
title_short |
Multi-stage metasomatism of diamondiferous eclogite xenoliths from the Udachnaya kimberlite pipe, Yakutia, Siberia |
title_full |
Multi-stage metasomatism of diamondiferous eclogite xenoliths from the Udachnaya kimberlite pipe, Yakutia, Siberia |
title_fullStr |
Multi-stage metasomatism of diamondiferous eclogite xenoliths from the Udachnaya kimberlite pipe, Yakutia, Siberia |
title_full_unstemmed |
Multi-stage metasomatism of diamondiferous eclogite xenoliths from the Udachnaya kimberlite pipe, Yakutia, Siberia |
title_sort |
multi-stage metasomatism of diamondiferous eclogite xenoliths from the udachnaya kimberlite pipe, yakutia, siberia |
publishDate |
2004 |
url |
https://oro.open.ac.uk/2178/ |
genre |
Yakutia Siberia |
genre_facet |
Yakutia Siberia |
op_relation |
Misra, Kula C.; Anand, Mahesh <https://oro.open.ac.uk/view/person/ma3776.html>; Taylor, Lawrence A. and Sobolev, Nikolai V. (2004). Multi-stage metasomatism of diamondiferous eclogite xenoliths from the Udachnaya kimberlite pipe, Yakutia, Siberia. Contributions to Mineralogy and Petrology, 146(6) pp. 696–714. |
container_title |
Contributions to Mineralogy and Petrology |
container_volume |
146 |
container_issue |
6 |
container_start_page |
696 |
op_container_end_page |
714 |
_version_ |
1802651062292709376 |