摘要
花岗岩的性质主要受源区组成与源岩性质的制约,本文根据花岗岩与源区源岩平衡理论,提出花岗岩的三级分类方案。首先按照花岗岩的全球分布分为大洋系列花岗岩(OSG)和大陆系列花岗岩(CSG)两大类。其次,OSG系列按照构造环境分为3类:大洋中脊花岗岩(MORG)、洋岛花岗岩(OIG)、岛弧花岗岩(IAG);CSG则按照变质相不同分为5类:与榴辉岩相平衡的花岗岩,与麻粒岩相平衡的花岗岩,与低温角闪岩相平衡的花岗岩,与高温角闪岩相平衡的花岗岩和与低压高温角闪岩相平衡的花岗岩。再次,OSG按照构造环境进一步细分;CSG再按源岩地球化学性质分为钠质与钾质两个亚类。这一系统分类方案,不仅解决了花岗岩分类理论问题,还提出了从花岗岩时空分布反演变质岩源区特征问题,开辟了花岗岩与变质岩结合的新思路。
The nature of granite is mainly governed by the composition of the magma sources and the nature of the source rocks. In this paper, based on the principle of phase equilibria between the granite and its source rocks, a three-level classification scheme for granites has been proposed. First of all, granites are classified into two groups including oceanic series of granites(OSG) and continental series of granites(CSG) based on their global distribution. Secondly, the OSG series are classified into three groups including mid-ocean ridge granites(MORG), ocean island granites(OIG) and island arc granites(IAG) based on their tectonic settings;whereas the CSG rocks are classified into five groups including the granites in equilibrium with eclogite facies, the granites in equilibrium with granulite facies, the granites in equilibrium with low temperature amphibolite facies, the granites in equilibrium with high temperature amphibolite facies, and the granites in equilibrium with low pressure high temperature amphibolite facies based on various metamorphic phases in equilibrium with magmas of those various granites of the CSG. Thirdly, the OSG rocks can be further classified into more detailed subclasses based on their tectonic settings, and the CSG rocks can also be further classified into sodic and potassic two subclasses based on geochemical properties of their source rocks. This systematic classification scheme is beneficial not only to solve the theoretical problem of granite classification, but also to point out the question of metamorphic rock source characteristics which were inverted based on the spatial and temporal distribution of granites, and further to open up a new idea for the combining study of granites and metamorphic rocks.
作者
张旗
原杰
焦守涛
王振
王跃
陈万峰
袁方林
李晓彬
ZHANG Qi;YUAN Jie;JIAO Shou-tao;WANG Zhen;WANG Yue;CHEN Wan-feng;YUAN Fang-lin;LI Xiao-bin(Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;School of Resources and Environment,Xingtai University,Xingtai Hebei 054001,China;Development Research Center,China Geological Survey,Beijing 100037,China;Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China;School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China;School of Earth Science,Lanzhou University,Lanzhou 730000,China;The Third Geological Brigade of Jiangxi Bureau,Jiujiang,Jiangxi 330300,China)
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2022年第3期657-667,共11页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
岩石圈演化国家重点实验室基金资助项目(81300001)
国家重点研发计划项目(2018YFC1505501,2016YFC0600510)
国家自然科学基金资助项目(41872253)
中国地质调查局地质调查项目(DD20221785)。
