小秦岭中生代花岗岩岩性带特征及岩石谱系单位划分

基金项目:

地质矿产部区域地质调查项目

详细信息

FEATURES AND LITHODEMIC DIVISION OF THE MESOZOIC GRANITOID LITHOLOGIC ZONES IN THE XIAO QINLING MOUNTAINS

摘要: 小秦岭中生代花岗岩是由老牛山、华山、闵峪等岩体组成的复式深成岩体。岩体内发育多类型岩性带，表明具有多期次熔融分异、侵位的演化规律，具成分和结构演化序列。通过岩性、成分、结构构造和接触关系、时空位态研究，进行了岩石谱系单位划分，建立了华山超单元组合。提出基本岩序是花岗岩区地质填图中最基本的观察和描述性单位，是谱系单位划分的基础。
Abstract: Mesozoic granites in the Xiao Qinling Mountains are represented by a complex pluton consisting of the Laoniushan, Huashan and Minyu granite bodies. Within the complex pluton there occur many types of lithologic zones, indicating that the pluton has an evolutionary regularity of polyphase meltingdifferentiation and emplacement and a sequence of compositional and structural evolution. Through studies of the lithology, composition, textures and structures, contact relationships and temporalspatial distribution of the rocks, the authors make lithodemic division of the rocks and establish the Huashan superunit assemblage. They propose that the essential rock sequence is the basic unit for observation and description in geological mapping in the area of magmatic rocks as well as the basis for lithodemic division.
- Xiao Qinling Mountains /
- lithodemic unit /
- lithologic zone /
- essential rock sequence