AGE AND SOURCE CHARACTERISTICS OF THE YUZHNOE AND ULAN-UDE REE-FLUORITE OCCURRENCES ASSOCIATED WITH CARBONATITE MAGMATISM (WESTERN TRANSBAIKALIA, RUSSIA)-Reference-Cited by-同舟云学术

AGE AND SOURCE CHARACTERISTICS OF THE YUZHNOE AND ULAN-UDE REE-FLUORITE OCCURRENCES ASSOCIATED WITH CARBONATITE MAGMATISM (WESTERN TRANSBAIKALIA, RUSSIA)

Published:2023-12-14 Issue:6 Volume:14 Page:0728
ISSN:2078-502X
Container-title:Geodynamics & Tectonophysics
language:
Short-container-title:Geodin. tektonofiz.

Author:

Redina A. A.¹,Doroshkevich A. G.²,Prokopyev I. R.³,Izbrodin I. A.⁴,Yang Yu.⁵

Affiliation:

1. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences

2. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Dobretsov Geological Institute, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University

3. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University

4. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Dobretsov Geological Institute, Siberian Branch of the Russian Academy of Sciences

5. Institute of Geology and Geophysics, Chinese Academy of Sciences

Abstract

The article presents new data on the age and isotopic (Sr, Nd) characteristics of the Yuzhnoe and Ulan-Ude REE-fluorite occurrences, paragenetically related to alkaline carbonatite magmatism. Age estimates of the fluorite-containing rocks were obtained from bastnaesites using U-Th-Pb (LA-ICP-MS) method and are 130.2±1.1 and 136.6±1.9 Ma for the Yuzhnoe and Ulan-Ude occurrences, respectively. The ƐNd(T) values of the bastnaesites vary from –7.41 to –6.08 for the Yuzhnoe occurrence and from –4.28 to –2.67 for the Ulan-Ude occurrence. The Yuzhnoe carbonatites are characterized by 87Sr/86Sr(I) ratios ranging from 0.705883 to 0.706011, and 87Sr/86Sr(I) ratios obtained for the Ulan-Ude bastnaesite-fluorite rocks are ranging from 0.70683 to 0.70687. The age estimates are consistent with the published geochronological data on alkaline carbonatite magmatism of the Central Asian orogenic belt related to Late Mesozoic intraplate magmatism and rifting. Isotopic Sr-Nd signatures of bastnaesite, as well as of the Yuzhnoe carbonatites and the Ulan-Ude bastnaesite-fluorites, indicate that their source rocks came from the enriched lithospheric mantle.

Publisher

Institute of Earth's Crust, Siberian Branch of the Russian Academy of Sciences

Subject

Earth-Surface Processes,Geophysics,Geology,Economic Geology

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