Russian Mineralogical Society
2nd International Conference "Crystallogenesis and Mineralogy"
Heterogeneous parageneses in coarse peridotite xenoliths from the Udachnaya kimberlite pipe

RMS-DPI code:  2007-1-134-0
Scientific session:  Session 5. Crystal chemistry and crystal morphology of minerals
Author listing:  Malygina E.V., Pokhilenko N.P.
Principal author:  Malygina Elena Veniaminovna
Language:  Russian
Abstract - Summary 
(short description):
The complex of grained peridotite xenoliths from the Udachnaya kimberlite pipe (central part of Siberian Platform) is represented by parageneses various in composition and P-T parameters of formation. The variations of chemical composition of peridotite minerals and classification of heterogeneities have been determined. The main types of heterogeneities found in the studied xenoliths are: a) significant variations of the chemical compositions of the rock-forming mineral grains, homogeneous within the discrete grains but different in composition within the xenolith bulk; b) the variations in the composition of spinels and enstatites, which form symplektite intergrowth structures and their single grains; c) the zoning of the large garnet grains from the most deep-seated garnet peridotites. The compositional heterogenity of the lherzolite minerals (pyroxenes, Cr-spinel and pyrope) within one xenolith is related to: a) the processes of various metosamatic treatment of the matter within the lower boundary litospheric mantle; b) the change of PT-parameters and dynamic processes in the litospheric mantle; and reflects a complicate evolution of the mantle substance.
RMS-DPI code:  2007-1-134-0
Proceeedings volume 
in the RMS catalogue:
Crystallogenesis and Mineralogy
Pages:  296-298
File of proceedings 
 263 K
Status:  printed
Recieved:  14/05/2007
Accepted:  16/05/2007
Published on-line:  05/01/2008
Permanent address of publication:
Contact author(s):  Malygina, Elena Veniaminovna

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