Features and origin of inclusions in the Jiliuhe granite, northeastern Inner Mongolia,China

ZHAO Handong; HAN Zhenzhe; ZHAO Haibin; NIU Yanhong; MA Liling

doi:10.12097/gbc.200509168

Geological Bulletin of China > 2005 > 24(9): 841-847. > DOI: 10.12097/gbc.200509168

ZHAO Handong, HAN Zhenzhe, ZHAO Haibin, NIU Yanhong, MA Liling. 2005: Features and origin of inclusions in the Jiliuhe granite, northeastern Inner Mongolia,China. Geological Bulletin of China, 24(9): 841-847. DOI: 10.12097/gbc.200509168

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Features and origin of inclusions in the Jiliuhe granite, northeastern Inner Mongolia,China

China University of Geosciences,Beijing 100083,China,2. Qiqihar Branch8 Heilongjiang Institute of Geological Survey,Qiqihar 161005,Heilongjiang,China

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Revised Date: January 24, 2005

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Monzogranite and granodiorite are distributed in a NE direction along both banks of Jiliu River in the Along Mountains area,northeastern Inner Mongolia. Many dark- colored microgranular mafic inclusions occur in these rocks. The in- clusions have typical magmatic and quench textures and contain acicular apatite, and some inclusions contain K- feldspar and quartz megacrystals of host rocks. The inclusions are mainly rounded in shape,showing pronounced plastic rheological charac- ters. They usually have a clear- cut contact relationship with the host rocks and sometimes transition or foggy contacts are also seen. The host rocks are rich in Si and K and exhibit the characteristics of magmatic evolution. Inclusions are rich in Mg,Fe and Ca and poor in Si,Al,and Na with Na>K. The rare earth element (REE)and trace element patterns for the inclu- sions and their host rocks are similar and both show an asymmetric, right- inclined LREE- enriched shape. Inclusions exhibit weak Eu depletion, while host rocks moderate- weak Eu depletion. Inclusions and host rocks display similarities in respect to geochemistry as well as non- cognate characters. These features indicate that dark inclusions in the Early Carboniferous Jiliuhe granites are the product of magma mixing and partly represent the basic end- member of mixed magma.
- Jiliuhe granites,
- microgranular dioritic inclusions of MME type,
- magma mixing,
- northeastern Inner Mongolia

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Features and origin of inclusions in the Jiliuhe granite, northeastern Inner Mongolia,China

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