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Deng Jinfu Mo Xuanxue Luo Zhaohua Zhao Hailing Zhao Guochun Cao Yongqing Yu Xuezheng (China University of Geosciences, Beijing, 100083)  
For the study of igneous petrotectonic assemblage, it is necessary to emphasize to use the multiple approach constraints from petrography, petrology, rock assemblage character, as well as the petrochemical and geochemical diagrams, rather than the chemical diagram only; and also to pay attention to distinguish the regional tectonic setting from the local one The primary definition of bimodal igneous rock assemblage means that both the felsic and mafic end members are predominant in it and with sparsity of the intermediate members, rather than the figure in histogram only The possible constraint resulted from extension and compression environment on the bimodal assemblage and calc alkaline igneous rock assemblage are discussed In order to reconstruct the paleo tectonic history,the ophiolite suite in combination with the arc igneous rock assemblage is necessary to be used and the cause of the compositional polarity for the arc igneous rocks is discussed It is shown that the igneous petrotectonic assemblage of the collisional orogenic belt and their types may be significant for the reconstruction of the boundary nature and evolutional history of the collisional orogenic belt In contrast to the compositional polarity for the arc magmatism, the symmetrical lateral zonation for the rifting magmatism is indicated The significance of the magmatic tectonic thermal event and the event sequence have been discussed, somewhat similar to the metamorphism, the clockwise (cw) and the counter clockwise (ccw) event sequence may be characteristic, respectively, of the continental collisional belt and the oceanic subduction related orogenic belt in general A scientific subject about crust mantle magma fluid metallogenic system is suggested and discussed, and it is considered that the metallogenic problem could be studied and solved only from such a large system
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