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Geochemistry of early Paleozoic alkali dyke swarms in south Qinling and its geological significance

Science China Earth Sciences 2003年第12期46卷 1292-1306页

作者：张成立高山张国伟柳小明于在平 The Key Laboratory of Northwest University Continental Dynamics Ministry of Education and Department of Ge-ology Northwest University Xian 710069 China State Key Laboratory for Mineral Deposits Research Nanjing University Nanjing 210093 China Department of Geochemistry China University of Geosciences Wuhan 430074 China

The early Paleozoic alkali dyke swarms in the Ziyang-Langao areas of south Qinling are characterized by bimodal volcanic association. They show the patterns of enriched LREE with high fractionation of light and heavy REE and enrichment of incompatible elements in the primitive man-tle-normalized spider-diagrams with peaks of Ba and Nb and valleys of Pb and Sr. The ratios of Ta/Hf are larger than 0.3 and those of Th/Ta less than 1.6, indicating that they were derived from enriched mantle sources closely related to plume. The occurrence of alkali dyke swarm demon-strates an extensional event of crust resulting from deep plume activity in the Qinling orogeny dur-ing early Paleozoic. The rifting extension could not continue due to the short activity of plume. Consequently, no new oceanic basin was formed.

关键词： alkali dyke swarms, rift, activity of plume, early Paleozoic, south Qinling.

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The Relation between Tectonic Movement and Climatic Change

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Global Geology 2003年第1期8卷 82-88页

作者： Xuexiang Yang Qiyuan Qiao Dianyou Chen Geo-Exploration College of Science and Technology Jilin UniversityNational Astronomical ObservatoryChinese Academy of ScienceCollege of MathematicsJilin University Changchun130026 ChinaBeijing100012 ChinaChangchun130021 China

Climate and tectonics are two interactive factors in the earth’s system. They are controlled by astronomical cy-cles. It has been unheeded for a long time that large-scale material motion caused by global climatic change is one of the powers for tectonic movement. Tectonic movement makes the distributional pattern of continent and ocean change and makes global climate type change strongly in large scale. It is a good example that the change of the sea-ice around Antarctic Continent and in the Drake Passage has the switch process for global climatic changes. Tide makes the oceanic crust of the East Pacific Ocean and the West Pacific Ocean rise or fall 60 cm oppositely. Before and after El Nino events, the oceanic level of the East Pacific Ocean and the West Pacific Ocean may rise or fall 40 cm oppositely. Because of isostasy, oceanic crust may fall or rise 13 or 20 cm. They are the reasons why El Nino events are interrelated with the earthquakes and volcanoes. This is so called seesaw phenomenon of oceanic crust.

关键词： sea-ice switch, El Nino, earthquake swarms, tide, seesaw phenomenon of oceanic crust

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