期刊
SCIENCE IN CHINA SERIES D-EARTH SCIENCES
卷 47, 期 -, 页码 39-52出版社
SCIENCE PRESS
DOI: 10.1360/04zd0023
关键词
zircon; in situ analysis; Hf isotope; U-Pb age; trace element; thermal events; Yanliao area
K-Ar ages of the Mesozoic (92-100 Ma) Fuxin alkalic basalts (western Liaoning Province) and the Tertiary (23-45 Ma) Pingquan alkalic basalts (eastern Hebei Province), and the results of in situ zircon U-Pb dating, Hf isotope and the trace elements from three monzonite xenoliths carried in the alkalic basalts are reported. The crust-mantle interaction occurring in the Yanshan intracontinental orogenic belt is also discussed. Fuxin zircons show highly uniform U-Pb age ((169 +/- 3) Ma). More than 95% Pingquan zircons display the age of (107 +/- 10) Ma except two are 2491 Ma and 513 Ma respectively. Zircons with the ages of (169 +/- 3) Ma have epsilon(Hf) close to zero. epsilon(Hf) of the zircons with the ages of (107 +/- 10) Ma are mainly at -11.5--16.3, showing the crustal derivation. Fuxin zircons contain low Nb, Ta, Sr, Th, U contents, low and narrow Hf model ages (0.87-1.00 Ga), which reflect that the source materials of the monzonite xenoliths are young to Pingquan (focus at (1.28 +/- 0.08) Ga). High contents of the incompatible elements, and wide range of Hf model ages (0.89-2.56 Ga) in Pingquan zircons suggest a more complex source and the highly crustal maturity in their petrogenesis. Comprehensive information including the published data indicates that J(3)-K-1 is the key period of the deep processes and shallow tectonic reverse in the Yanliao area. However, the processes were highly heterogeneous in spatial and in temporal.
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