辽西彰武大四家子地区中生代火山岩锆石U-Pb年代学及地球化学特征

肖高强; 高山; 黄华; 谢士稳; 张宏

Volume 33 Issue 2

Mar. 2008

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Article Navigation > Earth Science > 2008 > 33(2): 151-164

XIAO Gao-qiang, GAO Shan, HUANG Hua, XIE Shi-wen, ZHANG Hong, 2008. Zircon U-Pb Geochronology and Geochemistry of Mesozoic Volcanic Rocks from Dasijiazi Area at Zhangwu, West Liaoning Province. Earth Science, 33(2): 151-164.

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Zircon U-Pb Geochronology and Geochemistry of Mesozoic Volcanic Rocks from Dasijiazi Area at Zhangwu, West Liaoning Province

XIAO Gao-qiang^{1, 3
,},
GAO Shan^{1, 2, 3},
HUANG Hua^{1, 3},
XIE Shi-wen^{1, 3},
ZHANG Hong²

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
State Key Laboratory of Continental Dynamics, Department of Geology, North west University, Xi'an 710069, China
3.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2007-03-08
Publish Date: 2008-03-25

Abstract

Abstract

Zircon U-Pb dating by LA-ICPMS reveals that the age of Mesozoic volcanic rocks from the Zhangwu area in west Liaoning Province is 122.4± 0.4 Ma, which belongs to Early Cretaceous. Geochemical compositions of 23 typical volcanic samples are studied. The results show that most samples except three rhyolites have similar geochemical characteristics of high-Mg adakite (SiO₂ =56.46%-65.14%, Al₂O₃ =14. 60%--17.19%, Mg^# = 50--59, Sr=501- 700μg/g, Yb= 1.04- 1.54μg/g, Y= 12.0- 17.5μg/g, Eu/Eu^* = 0.85 - 0.97, Sr/Y = 29 - 46, La_N/Yb_N = 13 - 28). They also have high initial ⁸⁷Sr/⁸⁶Sr (0. 706 39-0. 706 47) and low Nd (122 Ma) values (- 6.43 to - 12.26) that are inconsistent with the original ones from slab melting. Pyroxene phenocrysts are characterized by reversed compositional zonning. Rare earth element concentrations decrease from pyroxene core to rim and also show negative Eu anomalies (Eu/Eu^*= 0.64-0. 76). Combined with the previous studies on volcanic rocks from the low part of Yixian Formation in Zhangwu area, we propose that our samples from Zhangwu area resulted from delamination and magma mixing. A crustally derived felsic magma resulted from partial melting of the low crust, heated by asthenosphere upwelling and subsequently mixed with a mantle-derived high-Mg adakitie melt during magma storage or ascent to surface to form the high-Mg adakites in the Zhangwu area.
- high-Mg adakites,
- magma mixing,
- delamination,
- Mesozoic volcanic rocks,
- West Liaoning Province

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References(56)

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Zircon U-Pb Geochronology and Geochemistry of Mesozoic Volcanic Rocks from Dasijiazi Area at Zhangwu, West Liaoning Province

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