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2016, 35(1) 51-65 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Stratigraphic sequences and zircon U- Pb dating of Yixian Formation in Caozhuang area of Xingcheng��western Liaoning |
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ZHANG Qian, ZHANG Mei-Sheng, LI Xiao-Bo, WANG Yi-Ni, LIU Xue-Song, ZHANG Min-Min |
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1. College of Earth Sciences��Jilin University��Changchun 130061��China; 2. Museum of Geology��Jilin University��Changchun 130026��China |
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Abstract��
The Caozhuang area of Xingcheng in southwestern Mesozoic Fuxin- -Yixian basin��western Liaon- ing��belongs to“the Mesozoic Jinxi- - Jinzhou- - Fuxin- - Yixian volcanic eruptive belt”�� The strata mainly volcanic in composition in the Caozhuang area should be grouped into Yixian Formation through the section measuring and large scaled investigation in this area��and can be further divided into three members from in ascending order�� The lower member (K 1 y 1 ) consists of glutenite and intermediate��intermediate- basic volcanic rocks�� The middle member (K 1 y 2 ) consists of lacustrine sediments and intermediate volcanic rocks��and the upper member (K 1 y 3 ) consists of intermediate and meta- alkaline volcanic rocks�� LA -ICP - -MS zircon U -Pb dating of the volcanic and pyroclastic rocks of the Jianshan section reveals that the K 1 y 1 and K 1 y 2 were formed in 131. 5 ±1. 4 Ma and 129. 2 ±1. 0 Ma�� respectively�� The weighted mean age of the intrusive trachyandesite in K 1 y 1 is 126. 0 ±1. 2 Ma��consistent with the age obtained from the type section of Yixian Fomation in Fuxin - Yixian basin�� Taking the correlation with the volcanic- sedimentary sequences��we propose that the Yixian Formation in Caozhuang area can be regarded as the lower and middle Yixian Formation in the type section��with missing its upper part in the Caozhuang area��indicating that the center of volcanic eruption was closer to the Fuxin - - Yixian basin at that time�� |
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Keywords��
stratigraphic sequence
Yixian Formation
zircon U-Pb dating
Early Cretaceous
western Liaoning
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Received Revised Online: |
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