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

doi:10.13745/j.esf.sf.2022.6.11

Abstract

Abstract:

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:

ZHANG Qi, ZHAI Mingguo, WEI Chunjing, ZHOU Ligang, CHEN Wanfeng, JIAO Shoutao, WANG Yue, YUAN Fanglin. Innovative petrogenetic classification of granitoids: Perspective from metamorphic anatexis and big data[J]. Earth Science Frontiers, 2022, 29(4): 319-329.

Figures/Tables 11

Fig.1 p-T diagram showing the distribution of metamorphic facies.Modified after [10].

Fig.2 A schematic p-T diagram showing the formation of granitoids under different pressures. Modified from Fig.1.

Fig.3 Schematic p-T diagram showing the metamorphic evolution within crust and the heating paths driven by mantle uprising. Basemap modified after [19].

Fig.4 Schematic p-T diagram showing the equilibrium between melts and residues produced by partial melting

Fig.5 Mode-box diagrams showing the variation in mode of minerals and melt for a metabasite with MORB composition during an isobaric heating under pressure of 0.7 GPa (a) and 1.5 GPa (b). Adapted from [10].

Fig.6 p-T pseudosection in the NCKFMASHTO system for a metabasite with MORB composition. Adapted from [10].

Fig.7 p-T diagram showing the optimal conditions of partial melting of metabasites

Fig.8 Yb-Sr plots of global intermediate-acidic magmatic rocks (a) and their density distributions (b)

Fig.9 Y-Sr diagram showing the relations between metamorphic residues and the density distributions of global intermediate-acidic magmatic rocks

Fig.10 REE distributions of TTG and the comparison with post-Archean granites(a) and REE distributions of amphibole, garnet and plagioclase (b). Adapted from [45,48].

Fig.11 Y-Sr diagram showing the classification of granitoids. Modified after Fig.8.

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