LA-ICP-MS zircon U-Pb dating and geochemical characteris-tics of Baoxing rock mass in Xifeng area of northern Liaoning Province

PENG Youbo; SONG Shu'e; LIU Jin; ZHANG Wenjing; WANG Ende; ZHAO Chen

Geological Bulletin of China > 2017 > 36(10): 1698-1707.

PENG Youbo, SONG Shu'e, LIU Jin, ZHANG Wenjing, WANG Ende, ZHAO Chen. 2017: LA-ICP-MS zircon U-Pb dating and geochemical characteris-tics of Baoxing rock mass in Xifeng area of northern Liaoning Province. Geological Bulletin of China, 36(10): 1698-1707.

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LA-ICP-MS zircon U-Pb dating and geochemical characteris-tics of Baoxing rock mass in Xifeng area of northern Liaoning Province

PENG Youbo^{1, 2,},
SONG Shu'e³,
LIU Jin^{1, 4},
ZHANG Wenjing⁵,
WANG Ende²,
ZHAO Chen^{1, 2}

1.
Liaoning Survey Academy of Geology and Mineral Resources, Shenyang 110031, Liaoning, China
2.
School of Resources and Civil Engineering/Northeast University, Shenyang 110004, Liaoning, China
3.
Liaoning Geological Experiment Research Institute, Shenyang 110032, Liaoning, China
4.
College of Earth Sciences, Jilin University, Changchun 130000, Jilin, China
5.
Seismological Bureau of Liaoning Province, Shenyang 110034, Liaoning, China

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Received Date: August 01, 2016
Revised Date: March 18, 2017
Available Online: August 15, 2023

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Abstract

Abstract

Located on the northern margin of North China Block, the Baoxing rock mass is mainly composed of granodiorite. According to LA-ICP-MS zircon U-Pb dating, it was formed in Middle Triassic, with the ²⁰⁶Pb/²³⁸U age of 235.0±1.3Ma. The average K₂O/Na₂O ratio is 1.07, indicating that the rocks belong to high-K calc-alkaline series. The rocks are enriched in LILE and depleted in HFSE, showing typical features of calc-alkaline series on an active continental margin. The average total amount of REE is 147×10^-6, and the curve exhibits obvious right-inclined feature on REE distribution pattern, suggesting that the rocks are of the type of LREE enrichment and HREE depletion with medium negative Eu anomaly. According to the petrology, geochemistry and geochronology in combination with the tectonic evolution research on adjacent areas, lithospheric delamination occurred under the extension in the study area, and then caused a large-scale magmatic activity in the Middle Triassic.
- Middle Triassic,
- LA-ICP-MS zircon U-Pb dating,
- Baoxing rock mass,
- granodiorite,
- northern Liaoning Province,
- North China Block

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LA-ICP-MS zircon U-Pb dating and geochemical characteris-tics of Baoxing rock mass in Xifeng area of northern Liaoning Province

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