학술논문
The Mesoproterozoic Bimodal Magmatism of the Ulutau Terrane, Central Kazakhstan.
Document Type
Article
Source
Subject
Language
ISSN
1028-334X
Abstract
The complex of volcanogenic rocks of the basalt–rhyolite composition of the Zhiide series has been studied in the southern part of the Ulutau Terrane in Central Kazakhstan. The age of rhyolites (1338 ± 5 Ma) was first estimated on the basis of the U–Pb (SIMS)-geochronological study of accessory zircons. This age corresponds to the first half of the Ectasian period of the Mesoproterozoic. The features of the composition of the mafic and felsic effusive rocks indicate their formation in the setting of continental rifting caused by activity of the mantle plume. [ABSTRACT FROM AUTHOR]