Geochemical features and age of baddeleyite from carbonatites of the Proterozoic Tiksheozero alkaline-ultramafic pluton, North Karelia

被引：1
|
作者：
Rodionov, N. V. [1 ]
Belyatsky, B. V. [1 ]
Antonov, A. V. [1 ]
Simakin, S. G. [2 ]
Sergeev, S. A. [1 ]
机构：
[1] Karpinskii Russian Geol Res Inst, St Petersburg 199106, Russia
[2] Russian Acad Sci, Inst Phys & Technol, Yaroslavl Branch, Yaroslavl 150007, Russia
来源：
DOKLADY EARTH SCIENCES | 2015年 / 464卷 / 02期
基金：
俄罗斯基础研究基金会;
关键词：
TRACE-ELEMENT COMPOSITION; ISOTOPE COMPOSITION; KOLA-PENINSULA; ZIRCON; COMPLEX; RUSSIA; HF;
D O I：
10.1134/S1028334X15100086
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
On the basis of the local composition, baddeleyite grains that were less altered due to interaction with an alkaline melt and corresponded to the primary stage of crystallization of the intrusion were selected from the carbonatite intrusion of the Proterozoic polyphase Tiksheozero alkaline-ultramafic complex. The single age of carbonatite crystallization characterized of the bulk volume of the intrusion was estimated for the first time on the basis of 40 local U-Th-Pb (SHRIMP II) analyses of these grains. The overall concordant age of baddeleyite is 1994.8 +/- 9.4 Ma, and the lower age limit of the polyphase complex formation is less than 1998.4 +/- 3.5 Ma.
引用
收藏
页码：1039 / 1043
页数：5
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