Multistage Svecofennian metamorphism: Evidence from the composition and U-Pb age of titanite from eclogites of the Belomorian Mobile Belt

被引：9
|
作者：
Skublov, S. G. [1 ,2 ]
Berezin, A. V. [1 ,3 ]
Rizvanova, N. G. [1 ]
Mel'nik, A. E. [1 ]
Myskova, T. A. [1 ]
机构：
[1] Russian Acad Sci, Inst Precambrian Geol & Geochronol, St Petersburg 199034, Russia
[2] Univ Mines, Natl Mineral Resources Univ, St Petersburg 199106, Russia
[3] St Petersburg State Univ, St Petersburg 199034, Russia
来源：
PETROLOGY | 2014年 / 22卷 / 04期
基金：
俄罗斯基础研究基金会;
关键词：
SM-ND; ROCKS; LEAD; CRATON; RUTILE; TRACE;
D O I：
10.1134/S0869591114040067
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
The first geochemical study of titanite from eclogites and associated rocks of the Belomorian Mobile Belt (BMB) by secondary ion mass spectrometry made it possible to establish the compositional features of this mineral in the garnet-bearing and garnet-free assemblages. Titanite from garnet-bearing assemblages is characterized by upward convex REE pattern and lowered HREE content relative to LREE, as well as the average Gd-N/Yb-N ratio around 16.5. Titanite from metaultrabasic rock inherits the specific features of the host rock, which should be taken into account when comparing with titanite from metagabbro. Results of U-Pb (TIMS) dating of titanite confirms the identification of the early and late stages of the Svecofennian metamorphism in the studied areas of BMB: early metamorphism with the peak eclogite facies conditions at around 1900 Ma, retrograde amphibolite facies metamorphism at 1870-1880 Ma, and late allochemical metamorphism accompanied by the pegmatite formation with an age of 1840 Ma.
引用
收藏
页码：381 / 388
页数：8
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