Zircon U-Pb Age of the Spilite-Keratophyre Sequence of the Dashizhai Formation in Maodeng of Xilinhaote, Inner Mongolia and Its Geological Significance

Geoscience ›› 2013, Vol. 27 ›› Issue (3): 525-536.

• Engineering Geology and Environmental Geology • Previous Articles Next Articles

Zircon U-Pb Age of the Spilite-Keratophyre Sequence of the Dashizhai Formation in Maodeng of Xilinhaote, Inner Mongolia and Its Geological Significance

CHENG Tian-she^1,2，YANG Wen-jing²，WANG Deng-hong³

1School of Earth Sciences and Resources, China University of Geosciences, Beijing100083,China;
2Tianjin Institute of Geological Survey, Tianjin300191, China;
3Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing100037,China

Received:2012-06-27 Revised:2013-02-26 Online:2013-06-07 Published:2013-06-08

Abstract

Abstract:

The spilite-keratophyre sequence is formed of spilite and quartz keratophyre interbeddedly in Dashizhai Formation in Maodeng district of Xilinhaote, Inner Mongolia. The zircon LA-ICP-MS U-Pb gives a weighted average age of (287.4±1.7) Ma (MSWD=0.63). These new data suggest that the protolith age of Dashizhai Formation was about Early Permian. The spilite is characterized by high SiO₂,Al₂O₃(>16%),Na₂O,TiO₂(>1.3%) and low CaO,MgO contents. The contents quartz keratophyre is characterized by high SiO₂,Na₂O and low Al₂O₃,TiO₂,K₂O,CaO contents. The spilite-keratophyre sequence belongs to typical bimodal rock series showed in the classification diagram of Zr/TiO₂-Nb/Y and calc-alkaline rock series showed in the SiO₂-FeO/MgO diagram. Spilite and quartz keratophyre are richer in LILE than in adjacent HFSE and similar in REE curve, which displays the characteristics of island-arc environment.Rock assemblage, rock series and geochemical characteristics prove that the spilite-keratophyre sequence formed in a continental margin-arc and local rifting environment, evoluting from the cognate magma which is from the wedge mantle by fluid metasomatism.

Key words: zircon U-Pb age, spilite-keratophyre sequence, Dashizhai Formation, continental margin-arc, Inner Mongolia

CLC Number:

P588.14

CHENG Tian-she，YANG Wen-jing，WANG Deng-hong. Zircon U-Pb Age of the Spilite-Keratophyre Sequence of the Dashizhai Formation in Maodeng of Xilinhaote, Inner Mongolia and Its Geological Significance[J]. Geoscience, 2013, 27(3): 525-536.

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Zircon U-Pb Age of the Spilite-Keratophyre Sequence of the Dashizhai Formation in Maodeng of Xilinhaote, Inner Mongolia and Its Geological Significance

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