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Crystallogenesis and Mineralogy
Saint Petersburg, Russia
30 September-4 October 2007
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Conferences & Meetings 2nd International Conference "Crystallogenesis and Mineralogy"
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Abnormal composition pyropes from lherzolites, composition features and origin

RMS-DPI code:  2007-1-158-0
Scientific session:  Session 5. Crystal chemistry and crystal morphology of minerals
Author listing:  Tychkov N.S., Pokhilenko N.P., Malygina E.V.
Principal author:  Tychkov Nickolay Sergeevich
Language:  Russian
Abstract - Summary 
(short description):
During this study, more than 1000 pyropes from kimberlite pipes and secondary collectors of different parts of Siberian platform and granular peridotites from Udachnaya pipe were analyzed. These researches have allowed us to mark out the group of pyropes with abnormal composition for lherzolitic paragenesis (LAC-pyropes), which are widespread in different regions and to describe this group as separate paragenetic type. Our investigations as well as summarized data from the literature on the subject suggest that LAC-pyropes usually belong to granular clinopyroxene-bearing harzburgites with P-T in situ conditions typically below 50 kb and 1000oC. Evidences of mineral composition change in xenoliths bearing LAC-piropes as well as its mineral composition identity with those of pyroxenite paragenesis xenoliths show that LAS-pyropes form as a result of high degree fusion melt influence on depleted lithospheric mantle peridotites.
 
RMS-DPI code:  2007-1-158-0
Proceeedings volume 
in the RMS catalogue:
 
Crystallogenesis and Mineralogy
Pages:  360-363
File of proceedings 
(PDF): 
 256 K
Status:  printed
Recieved:  10/05/2007
Accepted:  16/05/2007
Published on-line:  05/01/2008
Permanent address of publication:  http://www.minsoc.ru/2007-1-158-0/
Contact author(s):  Tychkov, Nickolay Sergeevich
 

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