Zircon U-Pb SHRIMP ages of eclogites from the North Qilian Mountains in NW China and their tectonic implication

Zircon U-Pb SHRIMP ages of eclogites from the North Qilian Mountains in NW China and their tectonic implication

Cathodoluminescence (CL) imaging and ion microprobe (SHRIMP) U-Pb dating were carried out for zircons from eclogites in the North Qilian Mountains. The results show weighted mean ages of 463±6 Ma and 468±13 Ma for two samples, respectively. These ages are the earliest record of Caledonian high-press...

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Bibliographic Details
Published in:Science bulletin (Beijing) Vol. 49; no. 8; pp. 848 - 852
Main Authors: Song, Shuguang, Zhang Lifei, Niu Yaoling, Song, Biao, Zhang Guibing, Wang Qianjie
Format: Journal Article
Language:English
Published: Beijing Springer Nature B.V 01-04-2004
Subjects:
Cathodoluminescence
Dating
Eclogite
Metamorphism
Mountains
Oceanic crust
Orogeny
Radiometric dating
Shellfish
Subduction (geology)
Tectonics
Zircon
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Summary:Cathodoluminescence (CL) imaging and ion microprobe (SHRIMP) U-Pb dating were carried out for zircons from eclogites in the North Qilian Mountains. The results show weighted mean ages of 463±6 Ma and 468±13 Ma for two samples, respectively. These ages are the earliest record of Caledonian high-pressure metamorphism in the North Qilian Mountains, and they may represent the timing of eclogite-facies metamorphism when the oceanic crust was subducted to mantle depths in this orogenic belt.
ISSN:2095-9273
2095-9281
DOI:10.1007/BF02889759