GEOCHEMISTRY, CHRONOLOGY AND HF ISOTOPE FEATURES OF THE PERMAIN INTERMEDIATE-BASIC VOLCANIC ROCKS IN WULANAOBAO AREA, URAD HOUQI, INNER MONGOLIA AND ITS GEOLOGICAL SIGNIFICANCE

GUO Shuo; TENG Xue-jian; LIU Yang; TENG Fei; HE Peng; WANG Wen-long; TIAN Jian; DUAN Xiao-long

Volume 23 Issue 3

Jun. 2017

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Article Navigation > Journal of Geomechanics > 2017 > 23(3): 397-410

GUO Shuo, TENG Xue-jian, LIU Yang, et al., 2017. GEOCHEMISTRY, CHRONOLOGY AND HF ISOTOPE FEATURES OF THE PERMAIN INTERMEDIATE-BASIC VOLCANIC ROCKS IN WULANAOBAO AREA, URAD HOUQI, INNER MONGOLIA AND ITS GEOLOGICAL SIGNIFICANCE. Journal of Geomechanics, 23 (3): 397-410.

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GEOCHEMISTRY, CHRONOLOGY AND HF ISOTOPE FEATURES OF THE PERMAIN INTERMEDIATE-BASIC VOLCANIC ROCKS IN WULANAOBAO AREA, URAD HOUQI, INNER MONGOLIA AND ITS GEOLOGICAL SIGNIFICANCE

Tianjin Center of Geological Survey, CGS, Tianjin 300170, China

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Received: 2016-10-26
Published: 2017-06-28

Abstract

Abstract

The Wulanaobao intermediate-basic volcanic rocks, distributed in Urad Houqi, Inner Mongolia, are located in the western north margin of the north China block. The outcropped lithologies mainly are grey black-spruce basalt, spruce basaltic andesite and greyish-green andesite. All samples show chemical signatures of calc-alkaline series which are characterized by contents of SiO₂ (49.33~65.84%), Na₂O (0.53~5.49%) and K₂O (0.25~6.40%). From basic to intermediate, the amount of rare earth elements, light rare earth elements enrichment degree and Eu negative anomaly degree show a trend of increase. The trace elements show subduction zone arc magmatite features which are characterized by wide depletion of Ta and Nb, and enrichment of the large ion lithophile elements (U, Ba, K). The zircon U-Pb dating results of the magma from volcanic rocks are 285.0±2.3Ma and 265.0±1.5Ma, which indicates that the volcanic rocks were formed at the early-middle Permian period. The age characteristics of captured zircons and the contact relations between volcanic rocks and underlying strata suggest that volcanic rocks from Wulanaobao were formed on the crust of the north China block. Zircon Hf isotopic information indicates that the magma was derived from the depleted mantle which was affected by the subducting plate and partly joined with crust-derived material during the rising stage.
- Hinggan-Mongolia orogenic belt,
- intermediate-basic volcanic rocks,
- Permian period,
- geochemistry,
- continental marginal arc

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References(49)

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