U-Pb ID-TIMS AGE OF RUTILE FROM THE NORTH MUYA BLOCK ECLOGITES (NORTHEASTERN TRANSBAIKALIA) AS A TRACER OF DURATION FOR OF THE CONTINENTAL LITHOSPHERE EXHUMATION

S. Yu. Skuzovatov; Скузоватов С. Ю.; N. G. Rizvanova; Ризванова Н. Г.; S. G. Skublov; Скублов С. Г.; V. S. Shatsky; Шацкий В. С.

doi:10.31857/S268673972360025X

U-Pb ID-TIMS AGE OF RUTILE FROM THE NORTH MUYA BLOCK ECLOGITES (NORTHEASTERN TRANSBAIKALIA) AS A TRACER OF DURATION FOR OF THE CONTINENTAL LITHOSPHERE EXHUMATION

Autores: Skuzovatov S.Y.¹, Rizvanova N.G.², Skublov S.G.²^,3, Shatsky V.S.⁴^,5
Afiliações:
1. Vinogradov Institute of Geochemistry, Russian Academy of Sciences, Siberian Branch
2. Institute of Precambrian geology and Geochronology, Russian Academy of Sciences
3. Saint Petersburg Mining University
4. Sobolev Institute of Geology and Mineralogy, Russian Academy of Sciences, Siberian Branch
5. Novosibirsk State University
Edição: Volume 512, Nº 1 (2023)
Páginas: 50-59
Seção: GEOCHEMISTRY
##submission.dateSubmitted##: 30.01.2025
##submission.datePublished##: 01.09.2023
URL: https://edgccjournal.org/2686-7397/article/view/649829
DOI: https://doi.org/10.31857/S268673972360025X
EDN: https://elibrary.ru/IHGQDC
ID: 649829

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Resumo

Being an abundant mineral phase of high-grade rocks, rutile is used as a tracer of lithospheric evolution for deep zones of orogenic belts. This study presents the new ID-TIMS U–Pb geochronological, mineralogical and geochemical data for rutile from the North Muya block (Baikal-Muya Foldbelt) eclogites in order to examine the applicability of its age estimates relative to the exhumation process of high-grade rocks. The assemblage of mineral inclusions in rutile (mainly titanite, epidote and amphibole) indicate rutile growth through titanite breakdown reactions during prograde metamorphism epidote-amphibolite or amphibolite-facies rocks. The range of Zr contents and estimated Zr-in-rutile crystallization temperatures correspond to conditions from prograde (619–638°С at 1.5 GPa) till peak ones (659–684°С for 2.5 GPa). The U–Pb age estimate (604 Ma) is notably younger than that of peak eclogitic metamorphism (630 Ma), and highlight the protracted cooling history of eclogite-bearing complex during its evolution below closure temperature of the U–Pb isotope system (~500–525°С) during tectonic unroofing or erosion of continental complexes.

Palavras-chave

Central Asian Orogenic belt, Baikal-Muya belt, eclogites, rutile, ID-TIMS U–Pb geochronology, lithospheric exhumation

Bibliografia

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