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LA-ICPMS Zircon U-Pb Dating of a Quartz Diorite Pluton from Wangjiacha, the Junction Area Between the Qinling and Qilian Orogenic Belts and Its Tectonic Significance

CHEN Jun-lu1,2， LI Hao-bin3,WANG Hong-liang2,4，HE Shi-ping2，ZENG Zuo-xun1，XU Xue-yi1，LI Xiang-min2   

  1. 1.Faculty of Earth Sciences，China University of Geosciences，Wuhan 430074,China;2.Xi’an Institute of Geology and Mineral Resource,Xi’an 710054,China;3.School of the Earth Sciences and Resources,China University of Geosciences，Beijing 100083,China;4.Department of Geology，Northwest University，Xi’an 710069,China
  • Received:2006-07-21 Revised:1900-01-01 Online:2007-05-26 Published:2007-05-26
  • Contact: CHEN Jun-lu

Abstract: Wangjiacha quartz diorite, outcropped in the junction area between Qinling and Qilian orogenic belts, was intruded into the metamorphic complex of the Longshan Group. Assemblage, chemistry and geochemical characteristics of the quartz diorite intrusion show the characteristics of subduction granite. Using LA-ICPMS(Laser-iso plasma mass spectrum) dating technique, U-Pb isotope dating for tiny areas of single zircons from the quartz diorite gives a weighted average age of (454.7±1.7) Ma, which probably stands for the formation age of the rocks. This dating is of great significance to the research on the Early Paleozoic tectonic evolution, on the orogenic processes in the junction area between the Qinling and Qilian and on the relationship between the Qinling and Qilian orogenic belts.

Key words: Wangjiacha quartz diorite, LA-ICPMS, U-Pb isotope dating, Qinling and Qilian orogenic belts

CLC Number: 

  • P597.3
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