Zircon U-Pb Dating and Petrogenesis of the Baiyingaolao Formation Rhyolites in Chaihe Area， Great Xing’an Range

doi:10.12068/j.issn.1005-3026.2016.03.023

Journal of Northeastern University Natural Science ›› 2016, Vol. 37 ›› Issue (3): 412-415.DOI: 10.12068/j.issn.1005-3026.2016.03.023

• Resources & Civil Engineering • Previous Articles Next Articles

Zircon U-Pb Dating and Petrogenesis of the Baiyingaolao Formation Rhyolites in Chaihe Area， Great Xing’an Range

SI Qiu-liang^1,2， CUI Tian-ri²， WANG En-de¹， DING Shu³

1.School of Resources & Civil Engineering， Northeastern University， Shenyang 110819，China; 2.Shenyang Institute of Geology and Mineral Resources， Shenyang 110034， China; 3. Shenyang Dingshenglongfeng Project Technology Consulting Co.， Ltd.，Shenyang 110002，China.

Received:2014-12-29 Revised:2014-12-29 Online:2016-03-15 Published:2016-03-07
Contact: SI Qiu-liang
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Abstract

Abstract: Zircon U-Pb istopic dating and geochemical analysis were used to study the formation age and petrogenesis of the rhyolites in Baiyingaolao Formation. LA-ICP-MS dating results show that the Baiyingaolao formation rhyolites in Chaihe area form in early cretaceous from 129 to 137Ma. The geochemical study results show that the rhyolites have the characteristic of high silicon and rich alkalis， poor calcium and magnesium. The total REE amount ranges from 121.35×10^-6 to 194.92× 10^-6. Fractionation of LREE and HREE is obvious［m(La)/m(Yb)_N=12.2~21.7］， and Eu has negative anomalies(δ_Eu=0.39~0.61). The trace elements are characterized evidently by enrichment of Rb，Ba，Th，K and depletion of Nb，Sr，P，Ti. Original magma of Baiyingaolao formation rhyolites is chiefly derived from partial melting of up crust rocks.

Key words: zircon U-Pb dating, geochemistry, rhyolites, Baiyingaolao formation, Chaihe area, central Great Xing’an Range

CLC Number:

SI Qiu-liang， CUI Tian-ri， WANG En-de， DING Shu. Zircon U-Pb Dating and Petrogenesis of the Baiyingaolao Formation Rhyolites in Chaihe Area， Great Xing’an Range[J]. Journal of Northeastern University Natural Science, 2016, 37(3): 412-415.

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Zircon U-Pb Dating and Petrogenesis of the Baiyingaolao Formation Rhyolites in Chaihe Area， Great Xing’an Range

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