2013, 32(4) 707-716 DOI:     ISSN: 1004-5589 CN: 22-1111/P
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Keywords
Zhangguangcai ��ange
Wudaoling Formation
volcanic rocks
zircon U-Pb chronology
geochemistry
tectonic setting
Authors
YU Qian-1
GE Wen-Chun-1
YANG Hao-1
XING De-He-2
ZHANG Yan-Long-1
PubMed
Article by Yu, Q. 1
Article by Ge, W. C. 1
Article by Yang, H. 1
Article by Xing, D. H. 2
Article by Zhang, Y. L. 1

Zircon U-Pb chronology and geochemical characteristics of volcanic rocks from Wudaoling Formation in Zhangguangcai ��ange

YU Qian-1, GE Wen-Chun-1, YANG Hao-1, XING De-He-2, ZHANG Yan-Long-1

1. College of Earth Sciences��Jilin University��Changchun 130061��China; 2. Shenyang Institute of Geology and Mineral ��esource��Shenyang 110034��China

Abstract��

The authors present geochronological and geochemical data for the volcanic rocks from Wudaoling Formation in Zhangguangcai ��ange��in order to constrain their chronology and tectonic setting�� Zircons from a representative volcanic rocks are euhedral �� subhedral in shape and display fine-scale oscillatory zoning in CL images as well as high Th /U ratios ( 0. 52 �� 2. 28) ��implying their magmatic origin�� Zircon U-Pb dating results indicate that the volcanic rocks formed in Early Permian ( 289 ± 3 Ma) �� The rock assemblages of Wudaoling Formation are composed mainly of basalts and rhyolites��displaying typical characteristics of bimodal volcanism and belonging chemically high-K calc �� alkaline to shoshonite series�� The basalts are characterized by a strong enrichment in large ion lithophile elements ( LILE) such as ��b��and K��a depletion in high field strength elements ( HFSE) such as Nb��and Ta�� On the other hand��the rhyolites show a strong enrichment in ��b��Th��U��and K��a depletion in Nb�� Ta��and Ti��as well as significant negative Sr��P��and Eu anomalies��and chemically similar to the A-type rhyolite�� Combined with the regional tectonic evolution��these geochemical features suggest the volcanic rocks from Wudaoling Formation were formed in a local extensional environment��similar to that within an island arc setting which could be related to the subduction of the Paleo-Asian oceanic plate beneath the Songnen-Zhangguangcai ��ange-Jiamusi massif��

Keywords�� Zhangguangcai ��ange   Wudaoling Formation   volcanic rocks   zircon U-Pb chronology   geochemistry   tectonic setting  
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