Geochronology of the volcanic rocks in the Lu-Zong basin and its significance

The Lu-Zong (Lujiang-Zongyang) basin is one of the most important volcanic basins in the middle and lower reaches of the Yangtze River area, China. It comprises four shoshonitic volcanic units, which are, in an ascending order, the Longmenyuan, Zhuanqiao, Shuangmiao and Fushan Groups. The LA-ICP MS...

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Bibliographic Details
Published in:Science China. Earth sciences 2008-10, Vol.51 (10), p.1470-1482
Main Authors: Zhou, TaoFa, Fan, Yu, Yuan, Feng, Lu, SanMing, Shang, ShiGui, Cooke, David, Meffre, Sebastien, Zhao, GuoChun
Format: Article
Language:English
Subjects:
Cretaceous
Earth and Environmental Science
Earth Sciences
Earthquakes
Geochemistry
Geophysics
Jurassic
Magma
Mesozoic
Plate tectonics
Rivers
Seismic activity
Seismology
Volcanic rocks
Volcanoes
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Summary:The Lu-Zong (Lujiang-Zongyang) basin is one of the most important volcanic basins in the middle and lower reaches of the Yangtze River area, China. It comprises four shoshonitic volcanic units, which are, in an ascending order, the Longmenyuan, Zhuanqiao, Shuangmiao and Fushan Groups. The LA-ICP MS U-Pb zircon ages of the four units are: 134.8±1.8 Ma for the Longmenyuan Group, 134.1±1.6 Ma for the Zhuanqiao Group, 130.5±0.8 Ma for the Shuangmiao Group, and 127.1±1.2 Ma for the Fushan Group. The results indicate that all volcanic rocks in the Lu-Zong basin were formed in the Early Cretaceous from about 135 Ma to 127 Ma, lasting 8–10 Ma. There were no Jurassic volcanic activities in all the volcanic basins including the Lu-Zong basin in the middle and lower reaches of the Yangtze River area. This work has provided new chronological results for the further study and understanding of the tectonic, magmatic and metallogenic processes of eastern China in the Mesozoic.
ISSN:1006-9313
1674-7313
1862-2801
1869-1897
DOI:10.1007/s11430-008-0111-7