内蒙古二连-东乌旗地区晚石炭世碱性花岗岩时代、成因及地质意义

王树庆; 辛后田; 张永; 刘文刚

doi:10.3799/dqkx.2021.081

Volume 47 Issue 4

Apr. 2022

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Wang Shuqing, Xin Houtian, Zhang Yong, Liu Wengang, 2022. Geochronology and Petrogenesis of Late Carboniferous Alkaline Granites from Erlian-Dongwuqi Region, and Its Geological Significance. Earth Science, 47(4): 1295-1315. doi: 10.3799/dqkx.2021.081

Citation:

Wang Shuqing, Xin Houtian, Zhang Yong, Liu Wengang, 2022. Geochronology and Petrogenesis of Late Carboniferous Alkaline Granites from Erlian-Dongwuqi Region, and Its Geological Significance. Earth Science, 47(4): 1295-1315. doi: 10.3799/dqkx.2021.081

Citation:

Wang Shuqing, Xin Houtian, Zhang Yong, Liu Wengang, 2022. Geochronology and Petrogenesis of Late Carboniferous Alkaline Granites from Erlian-Dongwuqi Region, and Its Geological Significance. Earth Science, 47(4): 1295-1315. doi: 10.3799/dqkx.2021.081

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Geochronology and Petrogenesis of Late Carboniferous Alkaline Granites from Erlian-Dongwuqi Region, and Its Geological Significance

doi: 10.3799/dqkx.2021.081

Wang Shuqing^{1, 2
,
,},
Xin Houtian^{1, 2},
Zhang Yong^{1, 2},
Liu Wengang^{1, 2}

1.
Tianjin Center of China Geological Survey, Tianjin 300170, China
2.
North China Center of Geoscience Innovation, Tianjin 300170, China

Received Date: 2021-04-06
Available Online: 2022-04-29
Publish Date: 2022-04-25

Abstract

Abstract

The Late Carboniferous alkaline granite belt in Erlian-Dongquqi area indicates regional extention after the closure of Hegenshan ocean. In this paper, it presents recently discovered Late Carboniferous alkaline granites in these regions: Honger(302±1 Ma), Zuhengdeleng (~299 Ma), and Narenbaolige (301.7±1.4 Ma) plutons. These rocks show characteristics of high silica (73.15%-77.38%), alkali (K₂O=4.28%-5.35%, Na₂O=4.01%-4.79%) contents, low CaO, MgO and relatively enriched FeO_t(FeO_t/MgO ratios are between 8.2-46.1) contents, similar with typical alkaline granite. Trace element analysis display enrichment of Rb, Th, U, K, Zr, Hf, but strong depletion of Sr, Ba, P, Ti. There are "sea gull" REE patterns with strong negative Eu abnormity (δEu ranges from 0.03 to 0.50). Furthermore, these rocks have depleted Nd-Hf isotopic composition, with two stage Hf-Nd model ages of Neoproterozoic-Early Paleozoic, indicating that the sources are juvenile crust derived from mantle in this period. Geochemical and Nd-Hf isotopic signatures argue for derivation from partial melting of juvenile crust by depression and heating of upwelling asthenosphere in post-orogeny extensional setting, demonstrating that the Hegenshan basin had closed before 300 Ma.
- alkaline granite,
- Late Carboniferous,
- Erlian-Dongwuqi,
- Hegenshan basin,
- geochemistry

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References(53)

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