Geochemistry and Age of Basic Dikes of the Snezhnoe Be Deposit: Evidence for the Late Paleozoic Plume-Mantle Magmatism of East Sayan

被引：0

作者：

Khubanov, V. B. ^{[1
]}

Dolgoborodova, K. D. ^{[1
]}

Tsygankov, A. A. ^{[1
]}

Khubanova, A. M. ^{[1
]}

Damdinova, L. B. ^{[1
]}

Damdinov, B. B. ^{[1
]}

Burmakina, G. N. ^{[1
]}

Zarubina, O. V. ^{[2
]}

机构：

[1] Russian Acad Sci, Dobretsov Geol Inst, Siberian Branch, Ulan Ude 670047, Russia

[2] Russian Acad Sci, Vinogradov Inst Geochem, Siberian Branch, Irkutsk 664033, Russia

来源：

DOKLADY EARTH SCIENCES | 2022年 / 507卷 / SUPPL 2期

基金：

俄罗斯基础研究基金会;

关键词：

Late Paleozoic; plume magmatism; asthenospheric mantle; East Sayan rare metal zone; Barguzin SLIP;

D O I：

10.1134/S1028334X22601055

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Mafic subvolcanic bodies (gabbroids, mafic dikes) occur within the East Sayan rift zone of the Late Paleozoic Barguzin silicic large igneous province (SLIP) together with ore-bearing alkali granitoids. The Snezhnoe Be deposit is a typical object with a mafic-alkali granitoid association. The mafic dikes intruding the ore structures of the deposit are dated using the LA-ICP-MS U-Pb method. The age of zircons from the diabase (dolerite) and microgabbro dikes is 301 +/- 6 and 297 +/- 2 Ma, respectively. These ages are similar to that of fluorite-phenakite-beryllium mineralization (306 Ma) and associated alkali granites with Ta-Nb mineralization, which are ascribed to the Ognit complex (311-295 Ma). The geochemical features of mafic dikes suggests the generation of mafic magmas from an asthenospheric mantle source, which, taking into account the intracontinental setting, indicates in favor of a plume-mantle nature of mafic-alkali granitoid magmatism of the East Sayan rift (rare metal) zone, in particular, the entire Barguzin SLIP in general.

引用

页码：S251 / S256

页数：6

共 3 条

[1] Age, composition of rocks, and geological setting of the Snezhnoe beryllium deposit: Substantiation of the Late Paleozoic East Sayan rare-metal zone, Russia
Yarmolyuk, V. V.
Lykhin, D. A.
Shuriga, T. N.
Vorontsov, A. A.
Sugorakova, A. M.
GEOLOGY OF ORE DEPOSITS, 2011, 53 (05) : 390 - 400
[2] Age, composition of rocks, and geological setting of the Snezhnoe beryllium deposit: Substantiation of the Late Paleozoic East Sayan rare-metal zone, Russia
V. V. Yarmolyuk
D. A. Lykhin
T. N. Shuriga
A. A. Vorontsov
A. M. Sugorakova
Geology of Ore Deposits, 2011, 53 : 390 - 400
[3] Early Paleozoic mantle evolution of East Kunlun Orogenic Belt in Qinghai, NW China: evidence from the geochemistry and geochronology of the Late Ordovician to Late Silurian mafic-ultramafic rocks in the Qimantag region
Duan, Xue-Peng
Meng, Fan-Cong
Jia, Li-Hui
INTERNATIONAL GEOLOGY REVIEW, 2020, 62 (15) : 1883 - 1903

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