TITLE

Conditions of crystallization, composition, and sources of rare-metal magmas forming ongonites in the Kalba-Narym zone, Eastern Kazakhstan

AUTHOR(S)
Sokolova, E.; Smirnov, S.; Khromykh, S.
PUB. DATE
March 2016
SOURCE
Petrology;Mar2016, Vol. 24 Issue 2, p153
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
This paper presents a study of ongonites from the Chechek and Akhmirovo dike belts located within the Kalba-Narym batholith in Eastern Kazakhstan. The obtained conclusions are based on the investigations of melt and fluid inclusion in quartz phenocrysts, supplemented by mineralogical and geochemical data. It was established that the dike rocks were formed by crystallization of volatile-rich rare-metal melts in the presence of an aqueous fluid phase with subordinate amounts of carbon dioxide and methane. The ongonites crystallized from three geochemically different melts. Porphyritic phenocrysts in the ongonites of the Chechek and Akhmirovo dike belts crystallized at close temperatures 560-605°C and pressure of 3.6-5.3 kbar. Ongonite magmas that formed the Chechek and Akhmirovo dike belts had a high ore potential. However, degassing dynamics was not favorable for the development of metasomatism and formation of hydrothermal mineralization at the level of dike emplacement. The area of the rare-metal magmatism represented by ongonite dikes and rare-metal granite pegmatites has been distinguished in the northern part of the Kalba-Narym zone. The formation of rare-metal magmas was related to the differentiation in large granitoid chambers under the effect of juvenile fluids derived from the Tarim mantle plume.
ACCESSION #
114514184

 

Related Articles

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics