J4 ›› 2009, Vol. 39 ›› Issue (6): 1073-1079.

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Characteristics and Origin of the Shadegai Pluton in the Daqingshan Area, Inner-Mongolia

ZHAO Qing-ying1, LI Gang1, LIU Zheng-hong1, XU Zhong-yuan1, LI Chun-feng2,3, WANG Wan-qiong1,WANG Xing-an1   

  1. 1.College of Earth Sciences, Jilin University, Changchun 130061, |China;2.Institute of Geophysics, China Earthquake Administration, Beijing 100081, |China;3.Earthquake Administration of Shaanxi Province, Xi’an 710068, China
  • Received:2009-06-18 Online:2009-11-26 Published:2009-11-26

Abstract:

The age and tectonic setting of the Shadegai pluton are discussed based on field investigation and the detailed petrological, mineralogical, geochemical and isotopic geochronological studies. Zircon U-Pb dating gives a weighted mean of  206Pb/238U apparent age of 198.5 Ma, which is interpreted to represent the emplacement age of the Shadegai pluton. The pluton was sited at the frontal compressive area of an Indosinian thrust nappe. The pluton is also concluded to be high-k calc-alkaline, postorogenic A-type granite based on petrological, mineralogical and geochemical studies and on tectonic setting analysis. The thrusting-related thicken crust resulted in the melting and emplacement of the magmas responsible for the formation of the Shadegai pluton. Magmatic activity made up an important part of the Indosinian movement in the area.

Key words: Shadegai pluton, geochemistry, formation age, genetic type, tectonic setting, Daqingshan

CLC Number: 

  • P581
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