【摘要】 讨论了不同构造环境下的火成岩组合:(1)洋中脊扩张,(2)洋岛,(3)岛弧,(4)MORS型和SSZ型蛇绿岩,(5)活动大陆边缘弧,(6)与俯冲作用有关的火成岩弧的组成极性,(7)大陆碰撞,(8)大陆裂谷,(9)稳定的克拉通或地台等环境的火成岩组合。强调不同作者采用不同的参数坐标定义的拉斑玄武岩系列(TH),钙碱性系列(CA)和碱性系列(A)等学术含义的差别,指出不要因为在语言书写上的相同混淆了它们在学术含义上的差别,而造成有关构造环境识别的误解。探讨了识别洋中脊扩张型(MORS)和洋俯冲带上面(SSZ)蛇绿岩(套)在火成岩组合上的差别。基于高温高压实验成果,提出定义高镁安山岩(HMA)时,对应于w(SiO2)的w(MgO)的最低值(表2)。讨论了镁安山岩—英安岩(MAD)和埃达克岩(adakite)的术语,建议采用Kay(1978)的镁安山岩—英安岩来定义(而不是用adakite来定义)俯冲洋壳板片局部熔融产生的岩浆,认为具高Sr/Y,低FeO/MgO,高MgO,高Ni,Cr的镁安山岩—英安岩才能满足板片熔浆(slab-melt)特征的要求,而不是只强调高Sr/Y这个指标。根据有关大陆碰撞造山的不同分类方案及其术语的确切含义,强调了后造山与大陆裂谷环境的A型/r的识别在于前者与CA/r共生,后者则无CA/r共生,A与CA的学术含义是Peacock钙碱指数的分类。更多还原

【Abstract】 This paper discusses igneous petrotectonic assemblages of various tectonic settings: 1. mid–ocean ridge spreading; 2. oceanic island; 3. island arc; 4. MORS–type and SSZ–type ophiolites; 5. active coutineutal marginal arc; 6. compositional polarity of subduction–related magmatic arcs; 7. continental collision; 8. continental rift; 9. stable craton or platform, etc. It is emphasized that the tholeiitic (TH), calc–alkaline (CA) and alkaline (A) series defined from various parameters by different authors have different scientific meanings. In this paper it is indicated that the same written terms of TH, CA and A but with various meanings could easily result in abuse of these terms, especially for the recognition of the tectonic settings. The difference between MORS–and SSZ–type ophiolites in terms of igneous petrotectonic assemblages is discussed. The lowest MgOwt% of the HMA is suggested ( Table 2 ), based on the data of petrological experiments. The terms of magnesian andesite–dacite and adakite are discussed, and in turn, the Kay’s magnesian andesite–dacite of higher Sr/Y, lower FeO/MgO, and higher MgOwt% as well as higher Ni, Cr contents, are comprehensively used, which can be more satisfactory to define the slab–melt, rather than the single parameter of high Sr/Y. The various schemes of classification for the continental collision are indicated, and it is necessary to be careful for using these schemes. The post–orogenic and the continental rifting A type granites are suggested to be associated with or without the CA/r, respectively, and the meaning of A and CA, here, is determined by the Peacock’s alkali-lime index.更多还原