Characteristics and geological significance of Early Carboniferous high-Mg andesites in Ma'anshan area, east Inner Mongolia

YANG Bin; ZHANG Bin; ZHANG Qingkui; MA Wei; LÜ Fengxiang; ZHAO Mingyuan; CHEN Shuliang; YUAN Xu

2018 Vol. 37, No. 9

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YANG Bin, ZHANG Bin, ZHANG Qingkui, MA Wei, LÜ Fengxiang, ZHAO Mingyuan, CHEN Shuliang, YUAN Xu. Characteristics and geological significance of Early Carboniferous high-Mg andesites in Ma'anshan area, east Inner Mongolia[J]. Geological Bulletin of China, 2018, 37(9): 1760-1770.

Citation:

YANG Bin, ZHANG Bin, ZHANG Qingkui, MA Wei, LÜ Fengxiang, ZHAO Mingyuan, CHEN Shuliang, YUAN Xu. Characteristics and geological significance of Early Carboniferous high-Mg andesites in Ma'anshan area, east Inner Mongolia[J]. Geological Bulletin of China, 2018, 37(9): 1760-1770.

Characteristics and geological significance of Early Carboniferous high-Mg andesites in Ma'anshan area, east Inner Mongolia

Geological Exploration Institute of Liaoning Province, Dalian 116100, Liaoning, China

Received Date: 20 March 2018

Revised Date: 21 June 2018

Publish Date: 15 September 2018

Abstract

Abstract

The Early Carboniferous high-Mg andesites in Ma'anshan area of eastern Inner Mongolia have LA-ICP-MS zircon U-Pb age of 346.4±1.4Ma, indicating that they were formed in Early Carboniferous. Ma'anshan high-Mg andesites belong to calc-alkaline series, with SiO₂ 53.22%-54.22%, MgO 7.21%-10.03%, Al₂O₃ 14.37%-15.94%, CaO 4.81%-5.94%, rich Na, poor K (Na₂O 3.87%-4.34%, K₂O 0.49%-0.93%), low TFeO/MgO(< 1.5), high Cr(364×10^-6-429×10^-6), and Ni (204×10^-6-211×10^-6). Similar to sanukite, all samples show enrichment of LREE and LILE (e.g., Rb, Ba, Sr and K), slight Eu negative anomaly and depletion of HFSE such as Nb, Zr, Ti, Y, Yb and Lu. They are equilibrium products of Sirich melt derived from partial melting of mantle peridotite and subducted oceanic crust, indicating a subduction background and suggesting that they were formed by ocean-continent transformation during the Palaeo-Asian Ocean closure.
- high-Mg andesites /
- sanukitie /
- zircon U-Pb age /
- geochemistry /
- Ma'anshan

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