Global Geology 2013, 16(4) 184-191 DOI:     ISSN: 1673-9736 CN: 22-1371/P

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Keywords
tonalite
SHRIMP
zircon U-Pb dating
Devonian
Altai metamorphic belt
Authors
WANG Wei( RZ) 1
WEI Chunjing2
ZHANG Yinghui2
CHU Hang3
PubMed
Article by WANG Wei( RZ) 1
Article by WEI Chunjing2
Article by ZHANG Yinghui2
Article by CHU Hang3

SHRIMP zircon U-Pb dating of a small tonalite intrusion in metamorphic belt of Chinese Altai orogen and its geological implication

WANG Wei( RZ) 1, WEI Chunjing2, ZHANG Yinghui2, CHU Hang3

1. Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China; 2. Key Laboratory of Orogenic Belts and Crustal Evolution,School of Earth and Space Sciences,MOE,Peking University, Beijing 100871,China; 3. Institute of Geology and Mineral Resources,Tianjin 300170,China

Abstract

Small granitic intrusions occur in the progressive metamorphic belts of the Chinese Altai orogen. SHRIMP U-Pb analyses were performed on zircons separated from a tonalite intrusion and yielded a concordant age of 409. 6 ± 3. 7 Ma ( MSWD = 0. 93) ,restricting the emplacement and crystallization of the tonalite intrusion to the Early Devonian. Combined with the existing geological data of the contemporary large granitic plutons in the Chinese Altai orogen,the tonalite is considered to be formed together with other granitic rocks in a continental arc setting. The tonalite intrusion has consistent foliation with its country rocks,indicating the strain resulting in the regional deformation should be very strong during or after the early Devonian.

Keywords tonalite   SHRIMP   zircon U-Pb dating   Devonian   Altai metamorphic belt  
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