THE FIRST Sm-Nd ISOTOPIC DATA FOR METAMORPHIC ROCKS OF THE GUDJAL BLOCK IN THE EASTERN PART OF BUREYA CONTINENTAL MASSIF

被引：0
|
作者：
Ovchinnikov, R. O. [1 ]
Sorokin, A. A. [1 ]
Kovach, V. P. [2 ]
Xu, W. L. [3 ]
机构：
[1] Russian Acad Sci, Far Eastern Branch, Inst Geol & Nat Management, 1 Relochniy ln, Blagoveshchensk 675000, Russia
[2] Russian Acad Sci, Inst Precambrian Geol & Geochronol, 2 Makarov Emb, St Petersburg 199034, Russia
[3] Jilin Univ, Coll Earth Sci, 2199 Jianshe St, Changchun 130061, Peoples R China
来源：
GEODYNAMICS & TECTONOPHYSICS | 2022年 / 13卷 / 01期
关键词：
Bureya continental massif; Gudjal block; metamorphic rocks; protolite; Sm-Nd method; NEOPROTEROZOIC MAGMATISM; LU-HF; PROTOLITH; EVOLUTION; TERRANE; PB;
D O I：
10.5800/GT-2022-13-1-0574
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：
It is the first time that there have been Sm-Nd isotopic geochemical studies conducted into the metamorphic rocks of the Gudjal block considered as a basement protrusion of the Bureya continental massif. It has been found that biotite and garnet-amphibole schists of the Gudjal formation are characterized by strongly negative epsilon(N)(d(0)) =-15.7...-17.2 values and Paleoproterozoic values of Nd model age of t(Nd(DM)) =2.4-2.1 Ga. Similar isotopic parameters are also typical of gneissic biotite granodiorites: epsilon(N)(d(0)) =-18.7, t(Nd(DM)) = 1.8 Ga. Out of orthorocks of the Gudjal block studied, the Neoproterozoic orthogneisses and orthoamphibolites of the Tulovchikha formation and the Neoproterozoic gneiss-granites of the Nyatyngran complex of the Paleoproterozoic model age may be considered as a probable substrate for melts.
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