ZIRCON U-Pb AGES FOR RHYOLITIC TUFFS OF THE NAOCANGJIANGOU FORMATION IN THE EAST KULUN OROGENIC BELT AND THEIR IMPLICATION

WU Fang; ZHANG Xu-jiao; ZHANG Yong-qing; ZHANG Yao-ling

2010 Vol. 16, No. 1

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WU Fang, ZHANG Xu-jiao, ZHANG Yong-qing, ZHANG Yao-ling. ZIRCON U-Pb AGES FOR RHYOLITIC TUFFS OF THE NAOCANGJIANGOU FORMATION IN THE EAST KULUN OROGENIC BELT AND THEIR IMPLICATION[J]. Journal of Geomechanics, 2010, 16(1): 44-50.

Citation:

ZIRCON U-Pb AGES FOR RHYOLITIC TUFFS OF THE NAOCANGJIANGOU FORMATION IN THE EAST KULUN OROGENIC BELT AND THEIR IMPLICATION

1.
Institute of Geomechanics, Chinese Academy of Geological Science, Beijing 100081, China
2.
College of Earth Science and Resources, China University of Geosciences, Beijing 100083, China
3.
Tianjin Institute of Geology and Mineral Resources, Tianjin 300170, China

Received Date: 04 December 2009

Publish Date: 25 March 2010

Abstract

Abstract

By using La-Mc-ICPMC method, accurate zircon U-Pb dating has been made for volcanic rock samples from the Naocangjiangou Formation in the Xiugou basin of the East Kunlun orogenic belt. The zircons from the rhyolitic tuff (sample DG25-4) showed oscillatory girdles in its cathodeluminescence image, indicating a typically magmatic origin. The ²⁰⁶Pb/²³⁸U surface ages of 15 magmatic zircons are concentrated in the range of 239-249 Ma, averaging 243.5 ± 1.7 Ma, which records the forming age of those volcanic rocks, that is, the Naocangjiangou Formation was formed in the early Middle Triassic. Early Paleozoic and Proterozoic zircons were also found in volcanic rocks of the formation, suggesting the possible presence of Proterozoic basement in the Kunlun southern terrain.
- Naocangjiangou Formation /
- tuffs /
- U-Pb age /
- Middle Triassic /
- East Kulun orogenic belt

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References

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