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《Chinese Journal of Geology》 1988-03
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WERE THE EMEISHAN BASALTS ERUPTED AS A CONSEQUENCE OF BACK-ARC SPREADING?

Huang Kainiun(Institute of Geology, Acadcwia Sinica, Beijing)  
In this paper the suthor is challenging the claim that the Emeishan basalts were erupted as a consequence of back-arc spreading, with the following arguments: (1) the investigation in recent years indicates that the subduction polarity of the Jinshajing-Ailaoshan suture zone (as \\ell as the Ganzi-Litang suture zone) might well point to the west rather than the east during the Hercynian-Indosinian; (2) no component related to the subduction has been detected from the major and trace element data of the Emeishan basalts; (3) the paleomagnctic study indicates that the Yangtze Block was in the southern hemisphere but very close to the equator in the Late Permian and afterwards drifted fast northward; (4) the eruption of most continenlal flood basalts in the world has little to do with subduction process. It appears that the eruption of the Emeishan basalts was due to the regional upwelling of the mantle in the western margin of the Yangtze Block and neighboring area during the Late Paleozoic, eventually resulting in the splitting and separation of the relavant continental blocks.
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