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RMS Annual Session combined with the Fedorov Session 2012
Saint Petersburg, Russia
8-10 October 2012
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Recrystallized rims of zircons as indicators of age and ore processes

RMS-DPI code:  2012-1-51-0
Scientific session:  M2. Mineralogical and petrological markers of the mineral/rock genesis. Minerals, ores and rocks as fingerprints
Author listing:  Kremenetskij A.A., Gromalova N.A., Kaygorodova E.
Principal author:  Gromalova Natalia
Language:  Russian
Abstract - Summary 
(short description):
The results of studies of zircon rims from a variety of rock types Re-Mo-U deposits Belskoe (Tver Region) are presented. Isotope-geochemical study of detrital zircons from the sands ( that include Re-Mo-U mineralization) have shown that the central parts of the zircons have U-Pb age 1600-1400 Ma (the age of formation of the ancient basement). Later recrystallized rims ( developed at these zircons) registered the three stages of U-Pb ages: 250-370 million years - the stage of sedimentation (1), 120-100 million years - the first postsedimentary activation stage (11) and 90-60 million years - the second one (12-Pg).
This young age of Re-Mo-U mineralization together with geological factors (extent of mineralization in all stratigraphic horizons of the section (from 1bb to 1mh-al) and its association with sub-vertical faults, near which the richest ore bodies were formed; the absence of oxidized zones in the ore-bearing horizons) allow to consider this type of mineralization as associated with epigenetic hydrothermal processes one.
 
Date of presentation:  10/10/2012
Presentation Place:  Mining University, Conference Hall
 
RMS-DPI code:  2012-1-51-0
Proceeedings volume 
in the RMS catalogue:
 
Mineralogy in whole space of the word.
File of proceedings 
(PDF): 
 286 K
Status:  printed
Accepted:  29/08/2012
Published on-line:  28/10/2012
Permanent address of publication:  http://www.minsoc.ru/2012-1-51-0/
Contact author(s):  Gromalova, Natalia
 

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