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Geoscience ›› 2012, Vol. 26 ›› Issue (1): 1-9.

• Stratigraphy • Previous Articles     Next Articles

Zircon Dating of the Baiyinduxi Group in Inner Mongolia and Its Tectonic Interpretation

 GU  Cong1, ZHOU  Zhi-An1, ZHANG  Wei-Kuan2, LIU  Chang-Feng1, LIU  Wen-Can1, WU  Yang-Sen1   

  1. 1School of Earth Sciences and Resources, China University of Geosciences, Beijing,100083, China;
    2Geological Survey of Inner Mongolia, Hohhot, Inner Mongolia,010020, China
  • Received:2011-09-09 Revised:2011-12-15 Online:2012-02-22 Published:2012-02-25

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Abstract:

A set of medium metamorphic clasolite exposing in the area, sandwiched by the Bainaimiao arc magmatic and Wenduermiao complex rock zones in the middle Inner Mongolia, is known as the Baiyinduxi Group.   Analysis of zircon (detrital grains) by using LA-MC-ICP-MS, sampled from the quartzsand stone of the group indicates that the apparent age is dated by 206Pb/238U technique, ranging from 294 Ma to 518 Ma and coinciding with the zircon dating from the Paleozoic arc magmatite of the northern margin of the North China block.  It is suggested that the Paleozoic arc magmatite might be a sedimentsource of the Baiyinduxi Group. Protolith of the group is likely a set of forearc depositional sequence, forming throughout the process of both the subduction of the
PaleoAsian Ocean floor and the Paleozoic magmatism, and was undergone with deformation and metamorphism due to orogenesis. Furthermore, obvious characters of the zircon samples showing magma genesis indicate that the protolith would be weathered sediments of either contemporaneous or slightly early magmatites. In addition, the fact that the Baiyinduxi Group was intruded by the endPermian granites suggests that the forming, deformation and metamorphism of the protolith should take place in the
period from 294 Ma to 254 Ma. Therefore, a collision along the Solonker suture zone should occur in the Early and Middle Permian. 

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