Title: MAGMATIC ACTIVITIES FROM PLUME-SOURCE IN THE QINLING OROGENIC BELT AND ITS DYNAMIC SIGNIFICANCE
Abstract: Mantle sources of the basalts of different geological periods from Qinling Orogenic Belt are geochemically identified. The results indicate that the magmatic activity of plume-type in North Qinling began at the Paleoproterozoic and lasted episodically till at least the Late Neoproterozoic, whereas that in South Qinling began at the Late Mesoproterozoic and lasted episodically till at least the end of Neoproterozoic. Therefore, the center of the plume magmatic activity migrated with time from the north to the south in the whole Qinling region. In the orogenic belt the northern Shang-Dan ocean was opened earlier at the Neoproterozoic ,whereas the southern Mian-Lue ocean at the Late Paleozoic. The two ancient oceanic basins have proved to be formed by continental break-up within the Yangtze plate, and the North Qinling has been identified to belong to the Yangtze plate prior to the Neoproterozoic. Based on synthesis of the above information, it is suggested that the orogenic development in Qinling should be expressed dynamically as the form of the Yangtze plate dispersion and the North China plate accretion.
Publication Year: 2001
Publication Date: 2001-01-01
Language: en
Type: article
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