摘要
讨论了火成岩构造组合，指出不能单纯地运用化学图解，强调要结合岩相学、岩石组合特征研究，要注意区分区域与局部的构造环境。指出双峰式火成岩组合的确切含义是指缺乏中性成员，而不单看化学图解的几何形态，讨论了伸展与挤压对双峰式和钙碱性火成岩组合的可能约束。指出由蛇绿岩套再造的古构造历史可能是残缺的，结合弧火成岩的厘定可在某些方面弥补这个不足，讨论了弧火成岩组成极性形成的可能原因。讨论了大陆碰撞造山带的火成岩构造组合类型及其在再造造山带的边界性质、造山带演化历史中的重要意义。指出大陆裂谷带的火成岩常呈组成对称的水平分带，而不同于弧火成岩的组成极性。讨论了岩浆构造热事件及其序列的重要意义，提出大陆碰撞造山带具类似于变质作用的顺时针演化的事件序列，而大洋俯冲造山带则具反时针演化的事件序列。最后，强调并讨论了“壳幔岩浆流体成矿系统”的科学命题。
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
出处
《地学前缘》
EI
CAS
CSCD
1999年第2期259-270,共12页
Earth Science Frontiers
基金
国家攀登专项
地质矿产部基础研究项目
国家自然科学基金
关键词
火成岩
构造组合
壳-幔岩浆
岩浆
流体
成矿系统
igneous petrotectonic assemblage, crust mantle magma, magma fluid metallogenic system
