ZIRCON U-Pb DATING AND GEOCHEMISTRY OF THE RHYOLITES FROM XINMIN FORMATION IN SANGENHE FOREST FARM, NORTHERN DAXINGANLING MOUNTAINS

LI Zhong-hui; LI Yang; LI Rui-jie; LI Kai

doi:10.13686/j.cnki.dzyzy.2020.04.002

2020 Vol. 29, No. 4

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Article navigation > Geology and Resources > 2020 > 29(4): 310-318

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LI Zhong-hui, LI Yang, LI Rui-jie, LI Kai. ZIRCON U-Pb DATING AND GEOCHEMISTRY OF THE RHYOLITES FROM XINMIN FORMATION IN SANGENHE FOREST FARM, NORTHERN DAXINGANLING MOUNTAINS[J]. Geology and Resources, 2020, 29(4): 310-318. doi: 10.13686/j.cnki.dzyzy.2020.04.002

Citation:

LI Zhong-hui, LI Yang, LI Rui-jie, LI Kai. ZIRCON U-Pb DATING AND GEOCHEMISTRY OF THE RHYOLITES FROM XINMIN FORMATION IN SANGENHE FOREST FARM, NORTHERN DAXINGANLING MOUNTAINS[J]. Geology and Resources, 2020, 29(4): 310-318. doi: 10.13686/j.cnki.dzyzy.2020.04.002

ZIRCON U-Pb DATING AND GEOCHEMISTRY OF THE RHYOLITES FROM XINMIN FORMATION IN SANGENHE FOREST FARM, NORTHERN DAXINGANLING MOUNTAINS

1.
Heilongjiang Institute of Geological Survey, Harbin 150036, China
2.
Qiqihar Institute of Geological Exploration, Qiqihar 161006, Heilongjiang Province, China

Received Date: 25 September 2019

Revised Date: 03 April 2020

Publish Date: 28 August 2020

Abstract

Abstract

The volcanic rocks of Xinmin Formation in Sangenhe forest farm are mainly composed of rhyolites and rhyolitic ignimbrites. The U-Pb dating results indicate the rhyolites were formed in Middel Jurassic, with the age of 165.71±0.83 Ma. The petrogeochemical analysis shows that the rhyolites are characterized by relatively high silicon, alkali and peraluminous, with the SiO₂ content of 71.05%-76.77%, Na₂O+K₂O of 6.66%-8.49% and A/CNK of 1.02-1.17. The rocks present medium total REE content, significant fractionation of HREEs and LREEs, strong negative Eu anomaly (δEu=0.39-0.66) and negative Dy anomaly, relative depletion of LILEs (Ba and Sr), enrichment of HSFEs (Th and U) and relative depletion of Nb, Dy and Ti, with the characteristics of A-type rhyolites. The study shows the magma is derived from partial melting of crustal materials. The Xinmin Formation is spatially distributed along the middle-north section of Daxinganling volcanic belt, revealing the volcanic belt was in a tensional tectonic environment in Middle Jurassic.
- Xinmin Formation /
- rhyolite /
- zircon U-Pb age /
- geochemistry /
- tectonic setting /
- Daxinganling Mountains

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References

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