Geochemistry of Cambrian High-Mg Andesites in North Qilian and Its Geodynamic Implications

WANG Xiaowei; YANG Chunxia; WANG Yuxi; YU Man

Northwestern Geology > 2018 > 51(1): 34-43.

WANG Xiaowei, YANG Chunxia, WANG Yuxi, et al. Geochemistry of Cambrian High-Mg Andesites in North Qilian and Its Geodynamic Implications[J]. Northwestern Geology, 2018, 51(1): 34-43.

Citation:

WANG Xiaowei, YANG Chunxia, WANG Yuxi, et al. Geochemistry of Cambrian High-Mg Andesites in North Qilian and Its Geodynamic Implications[J]. Northwestern Geology, 2018, 51(1): 34-43.

Citation:

WANG Xiaowei, YANG Chunxia, WANG Yuxi, et al. Geochemistry of Cambrian High-Mg Andesites in North Qilian and Its Geodynamic Implications[J]. Northwestern Geology, 2018, 51(1): 34-43.

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Geochemistry of Cambrian High-Mg Andesites in North Qilian and Its Geodynamic Implications

1. Geological Survey of Gansu Province, Lanzhou 730000, Gansu, China;
2. The 3th Gansu Provincial Bureau of Geology and Mineral Exploration and Development, Lanzhou 730050, Gansu, China;
3. Gansu Institute of Land Resources Planning and Research, Lanzhou 730000, Gansu, China

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Received Date: June 06, 2017
Revised Date: September 19, 2017
Available Online: July 28, 2022
Published Date: March 04, 2018

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Abstract

Abstract

High-Mg andesites are occurred in Zakeshan area,North Qilian, which were formed in Early and Middle Cambrian, with Rb-Sr isotopic age of (516±7)Ma (1σ).These andesites (SiO₂=51.45%~59.62%,averaging in 56.33%)have higher MgO contents (MgO contents are 4.85%~9.64%, averaging in 71.44%, Mg^# values are 66.68~74.15, averaging in 71.44)than the ones of typical island arc andesite, with enrichment of Cr (21.6×10^-6~476×10^-6, averaging in 196.26×10^-6), Ni (14×10^-6~102×10^-6, averaging in 56.14×10^-6)and Na elements, but low Al (Al₂O₃=13.22%~17.37%, averaging in 15.69%), Ca (CaO=2.01%~10.33%, averaging in 5.64%)and K (K₂O=1.04%~2.79%, Na₂O/K₂O=0.59~5.0, averaging in 2.36).Meanwhile, these rocks show weakly negative Eu anomaly, they are enriched in Rb, Th and K (LILE), but they are depleted in Sr, Ti, P, Nb and Ta (HFSE), with LREE/HREE ratios ranging from 7.19 to 13.58 (Yb=1.47×10^-6~3.26×10^-6, Y=11.6×10^-6~22.5×10^-6). Combined with regional geological setting, the results suggest that high-Mg andesite was formed in island arc setting and was sourced from the partial melting of the peridotites in mantle wedge, which were metasomated by the fluids from subducted sediments and altered oceanic crust.
- high-Mg andesite,
- Cambrian,
- geoehemistry,
- geodynamics,
- Zakeshan area,
- North Qilian

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Geochemistry of Cambrian High-Mg Andesites in North Qilian and Its Geodynamic Implications

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Geochemistry of Cambrian High-Mg Andesites in North Qilian and Its Geodynamic Implications

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