Zircon UPb Dating and Petrogenesis of the Rhyolitic Porphyroclastic Lava in Chaihe Area， Daxinganling Mountains

doi:10.12068/j.issn.1005-3026.2014.03.031

Journal of Northeastern University Natural Science ›› 2014, Vol. 35 ›› Issue (3): 443-445.DOI: 10.12068/j.issn.1005-3026.2014.03.031

• Resources & Civil Engineering • Previous Articles Next Articles

Zircon UPb Dating and Petrogenesis of the Rhyolitic Porphyroclastic Lava in Chaihe Area， Daxinganling Mountains

SI Qiuliang¹， CUI Tianri²， WANG Ende¹， MEN Yekai¹

1. School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China； 2. Shenyang Institute of Geology and Mineral Resources， Shenyang 110034， China.

Received:2013-06-12 Revised:2013-06-12 Online:2014-03-15 Published:2013-11-22
Contact: SI Qiuliang
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Abstract

Abstract: In order to study the formation age and petrogenesis of the rhyolitic porphyroclastic lava in Chaihe area， Daxinganling mountains， ziron UPb isotopic dating and geochemical analysis were used. LAICPMS zircon UPb dating results show that Chaihe rhyolitic porphyroclastic lava formed in early cretaceous from 135 to 138Ma. The geochemical study show that characteristics of the rhyolitic porphyroclastic lava have high silicon and alkalis， poor calcium and magnesium. The total REE abundances ranged from 1501×10-6~1915×10-6， highly fractionated LREE from HREE［m(La)/m(Yb)N=118~1445］and negative Eu anomalies (δEu=059~075). The trace elements are characterized evidently by enrichment of Rb，Ba，K， strong depletion of Nb， P， Ti. The geochemical characteristics show similarity with the Itype granite. The porphyroclastic lava’s original magma is chiefly derived from partial melting of crust.

Key words: rhyolitic porphyroclastic lava, zircon UPb dating, geochemistry, Daxinganling Mountains, Chaihe area

CLC Number:

SI Qiuliang， CUI Tianri， WANG Ende， MEN Yekai. Zircon UPb Dating and Petrogenesis of the Rhyolitic Porphyroclastic Lava in Chaihe Area， Daxinganling Mountains[J]. Journal of Northeastern University Natural Science, 2014, 35(3): 443-445.

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Zircon UPb Dating and Petrogenesis of the Rhyolitic Porphyroclastic Lava in Chaihe Area， Daxinganling Mountains

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