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Journal of the Geological Society; 2008; v. 165; issue.5; p. 887-890;
DOI: 10.1144/0016-76492007-174
© 2008 Geological Society of London

Short Communication

SHRIMP U–Pb zircon geochronology of Neoproterozoic Korla mafic dykes in the northern Tarim Block, NW China: implications for the long-lasting breakup process of Rodinia

WENBIN ZHU, ZHIYONG ZHANG, LIANGSHU SHU, HUAFU LU, JINBAO SU & WEI YANG

State Key Laboratory for Mineral Deposits Research (Nanjing University), Department of Earth Sciences, Nanjing University, Nanjing 210093, China (e-mail: zwb{at}nju.edu.cn)

Mafic dykes are observed in the Korla region along the northern Tarim Block, NW China. Our sensitive high-resolution ion microprobe U–Pb zircon ages, the first determined for these dykes, indicate that the mafic dykes were mainly formed at 650–630 Ma, and thus document the youngest known igneous activity associated with rifting in the Tarim Block during the Neoproterozoic. Combined with previous geochronological data, at least three pulses of magmatic activity, from c. 830 to 800 Ma, from c. 790 to 740 Ma and from c. 650 to 630 Ma, are recognized, which reveal that multiple episodes of rifting occurred within the Tarim Block, implying that the breakup of the Rodinia supercontinent in the Tarim Block may have been a long-lasting process.





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Z. ZHANG, W. ZHU, L. SHU, J. SU, and B. ZHENG
Neoproterozoic ages of the Kuluketage diabase dyke swarm in Tarim, NW China, and its relationship to the breakup of Rodinia
Geological Magazine, 2009; 146: 150 - 154.
[Abstract] [Full Text] [PDF]