大别造山带北部变质花岗岩岩石谱系单位划分及特征  

PETROLOGICAL LINEAGE UNIT DIVISION AND CHARACTERISTICS OF THE METAMORPHOSED GRANITE IN THE NORTHERN DABIE OROGEN

作　　者：路玉林[1] 刘丽利[1] 李运怀[1] 

机构地区：[1]安徽省地质调查院,安徽合肥230001

出　　处：《安徽地质》2001年第3期170-178,共9页Geology of Anhui

摘　　要：1∶5万区调工作将原大别杂岩解体划分为变质表壳岩、变质超镁铁质岩、变质花岗岩三部分。变质花岗岩广泛分布于大别造山带中。通过区内变质花岗岩的研究发现,成分上构成了闪长质(石英闪长质)→石英二长闪长质、石英二长质的演化趋势;结构上由细粒结构→中细粒结构→中细粒粗斑状结构→中细粒巨斑状结构的规律性变化。参照岩石谱系单位划分原则对其进行划分、归并,在空间上相伴生,具有同源岩浆演化特征,建立了岳西片麻岩套,并对其岩石学、岩石化学、地球化学特征作了阐述,确定其属岛弧环境的钙碱性岩石,为正确认识大别造山带的早期构造演化提供了重要的地质依据。The formerly called Dabie complex has been discomposed in this paper into meta crustose, meta ultramafic rock, and meta granite that widely distributes in the Dabie orogen based on 1: 50000 regional geological survey. It is found that the meta granite has an evolving trend from the dioritic(quartz dioritic) to quartz monzodioritic then quartz monzonitic in composition, and a regular change from the fine grained to medium fine grained, then medium fine grained coarsely porphyritic, finally medium fine grained mega porphyritic in texture. According to the petrological lineage unit division rule these rocks are divided and reunited to establish the Yuexi gneissic suite for they are associated with one another spatially and have comagmatic evolution features. Additionally, a discription has been made on the rocks in petrology, petrochemistry and geochemistry, which are proved to be calc alkaline ones formed in island arc environment and serve as an important geological basis for understanding the Dabie orogen.

关 键 词：变质花岗岩 岩石谱系单位 片麻岩套 大别遣山带 

分 类 号：P588.3[天文地球—岩石学]