GEOCHEMICAL CHARACTERISTICS OF UPPER JURASSIC INTERMEDIATE-GRANITIC VOLCANIC ROCKS FROM NORTHERN CHIFENG, INNER MONGOLIA

HAO Bin; YANG Xin-de; ZHANG Ming-yang; XIE Cheng-fei

2011 Vol. 17, No. 3

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HAO Bin, YANG Xin-de, ZHANG Ming-yang, XIE Cheng-fei. GEOCHEMICAL CHARACTERISTICS OF UPPER JURASSIC INTERMEDIATE-GRANITIC VOLCANIC ROCKS FROM NORTHERN CHIFENG, INNER MONGOLIA[J]. Journal of Geomechanics, 2011, 17(3): 274-285.

Citation:

GEOCHEMICAL CHARACTERISTICS OF UPPER JURASSIC INTERMEDIATE-GRANITIC VOLCANIC ROCKS FROM NORTHERN CHIFENG, INNER MONGOLIA

1.
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
2.
Institute of Geomechanics, Chinese Academy of Geological Sciencses, Beijing 100081, China

Received Date: 20 April 2011

Publish Date: 25 September 2011

Abstract

Abstract

Upper Jurassic intermediate-granitic volcanic rocks from northern Chifeng lie in Mongolia Paleo-uplift, the northern margin of the North China Craton.The lava mainly consists of rhyolite, andesite and augite andesite.The geochemical study for intermediate-granitic volcanic rocks suggests that the SiO₂ is in 50.74% ~58.82%, Al₂O₃ and K₂O+Na₂O range from 15.32% ~ 17.17% and 4.89%~7.05%, Mg^# changes from 0.13 to 0.39, which belong to Sodium and Calc-alkaline series.Geochemical results for rhyolite indicate that the SiO₂ are in 74.68%~74.86%, Al₂O₃ and K₂O+Na₂O range from 12.09%~13.13%, Mg^# changes from 0.13 to 0.39 and they belong to Calc-alkaline series or Shoshonitic series.The trace elements analysis for intermediate volcanic rocks demonstrate the insignificantly Eu anomalies (Eu^*/Eu=0.94~1.12) and intense fractionation between LREE and HREE, [(La/Yb)_N=9.6~16.09].The primitive mantle-normalized spider diagrams are characterized by LILE enrichment and HFSE depletion, especially an obviously negative Nb-Ta anomalies, and obviously positive Pb anomalies.Rhyolite has the similar characteristics and is characterized by a significantly negative Eu anomalies, [(La/Yb)_N=7.86~10.05].Based on the previous studies, we infer that intermediate volcanic rocks formed under the stretching and thinning environment.With geothermal gradient increasing and atmosphere upwelling, andesitic magma resulted from partial melting of enriched lithospheric mantle.
- intermediate-granitic volcanic rock /
- Upper Jurassic /
- lithospheric mantle /
- stretching and thinning /
- northern Chifeng

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References

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