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509793 
Journal Article 
Paleoproterozoic mafic dyke from Kongling terrain in the Yangtze Craton and its implication 
Peng, M; Wu, YB; Wang, J; Jiao, WF; Liu, XC; Yang, SH 
2009 
Yes 
Chinese Science Bulletin
ISSN: 1001-6538
EISSN: 1861-9541 
54 
6 
1098-1104 
English 
Mafic dyke is a sign of regional extension, and thus has important tectonic significance. A great amount of mafic dykes occur in the Kongling terrain of the Yangtze Craton, which have great bearing on the early evolution of the Yangtze Craton. Their ages, however, have not been well constrained. In this paper we report an integrated study of zircon U-Pb age and Hf isotope compositions for a mafic dyke in the Kongling terrain. The zircons yielded a weighted mean Pb-207/Pb-206 age of 1852 +/- 11Ma, which represents its intrusion age. They have E > (Hf)(t) values of -6.3 to 0.5, with a weighted mean of -3.06 +/- 0.88, suggesting that the mafic dyke came from metasomatic mantle. The results indicate that the Yangtze Block had transformed into post-collisional extensional regime at ca. 1850 Ma. In the same period, the Yangtze Craton shows enough rigidity to produce brittle rupture, and thus has the characteristics of a craton. 
Kongling terrain; Paleoproterozoic; mafic dyke; zircon U-Pb age; extensional regime; cratonization; north china craton; u-pb age; pressure metamorphic rocks; ga; continental-crust; o isotope evidence; south china; zircon; geochronology; icp-ms; geochemical evidence; shandong province