Earth Science Frontiers ›› 2022, Vol. 29 ›› Issue (4): 319-329.DOI: 10.13745/j.esf.sf.2022.6.11

Previous Articles     Next Articles

Innovative petrogenetic classification of granitoids: Perspective from metamorphic anatexis and big data

ZHANG Qi1,2(), ZHAI Mingguo1,2, WEI Chunjing3, ZHOU Ligang1,2, CHEN Wanfeng4, JIAO Shoutao5,6, WANG Yue7, YUAN Fanglin1,2   

  1. 1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    2. State Key Laboratory of Lithospheric Evolution, Beijing 100029, China
    3. School of Earth and Space Sciences, Peking University, Beijing 100871, China
    4. Key Laboratory of Mineral Resources in Western China (Gansu Province), School of Earth Sciences, Lanzhou University, Lanzhou 730000, China
    5. Development Research Center, China Geological Survey, Beijing 100037, China
    6. Technology Innovation Center of Geological Information, Ministry of Natural Resources, Beijing 100037, China
    7. School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China
  • Received:2022-05-20 Revised:2022-06-10 Online:2022-07-25 Published:2022-07-28


The current ISMA classification of granitoids is not systematic and lacks petrogenetic specification. Most granitoids may have originated from anatexis of metamorphic rocks under lower crustal conditions, triggered by conductive and/or advective heating from asthenosphere mantle uprising and basaltic magma underplating. Thus, granitoid petrogenesis is causally related to metamorphism, and, to some extent, there is a parent-child relation between metamorphic rocks and granitoids. If adakites are formed by partial melting of eclogites under high-pressure (HP) conditions without plagioclase, what about granitoid types formed by partial melting under medium-pressure (MP) conditions with the presence of both plagioclase and garnet, or under low-pressure (LP) conditions without garnet? On the basis of these considerations, combined with big data technology, we proposed an alternative granitoid classification scheme. Granitoids are classified into three types: (1) high Sr-low Y type formed under HP conditions without plagioclase in subducted slabs or thickened crustal regions; (2) low Sr-low Y type formed under MP conditions with both plagioclase and garnet in normal or slightly thickened crustal regions; and (3) low Sr-high Y type formed under LP conditions without garnet in extended crustal regions. Big data statistics suggested that the above three granitoid types can be roughly demarcated by the geochemical criteria-Sr content of 400×10-6 and Y content of (20-35)×10-6.

Key words: classification of granitoids, metamorphism, partial melting, anatexis, residue, big data

CLC Number: