首页|期刊导航|中国地球化学学报（英文版）|Tectonic Subdivision of Dabie Orogenic Belt, Central China: Evidence from Pb Isotope Geochemistry of Late Mesozoic Basalts
中国地球化学学报（英文版）2002，Vol.21Issue(2)：147-155,9.
Tectonic Subdivision of Dabie Orogenic Belt, Central China: Evidence from Pb Isotope Geochemistry of Late Mesozoic Basalts
Tectonic Subdivision of Dabie Orogenic Belt, Central China: Evidence from Pb Isotope Geochemistry of Late Mesozoic Basalts
摘要
Abstract
It has long been debated that the Dabie orogenic belt belongs to the North China or Yangtze craton. In recent years, eastern China has been suggested, based on the Pb isotopic compositions of Phanerozoic ore and Mesozoic granitoid K-feldspar (revealing the crust Pb) in combination with Meso-Cenozoic basalts (revealing the mantle Pb), being divided into the North China and Yangtze Pb isotopic provinces, where the crust and mantle of the Yangtze craton are characterized by more radiogenic Pb. In this sense, previous researchers suggested that the pro-EW-trending Dabie orogenic belt with less radiogenic Pb in the crust was part of the North China craton. In this paper, however, the Late Cretaceous basalts in the central and southern parts of the Dabie orogenic belt are characterized by some more radiogenic Pb (206pb/204pb = 17. 936 - 18. 349, 207pb/204pb = 15. 500 - 15. 688, 208pb/204pb = 38. 399 - 38. 775 )and a unique U-Th-Pb trace element system similar to those of the Yangtze craton, showing that the Mesozoic mantle is of the Yangtze type. In addition, the decoupled Pb isotopic compositions between crust and mantle were considerably derived from their rheological inhomogeneity, implying a complicated evolution of the Dabie orogenic belt.关键词
Pb isotope/basalt/geochemical subdivision/decoupled crust-mantle evolution/Yangtze craton/Dabie orogenic belt/central ChinaKey words
Pb isotope/basalt/geochemical subdivision/decoupled crust-mantle evolution/Yangtze craton/Dabie orogenic belt/central China引用本文复制引用
匡少平,张本仁..Tectonic Subdivision of Dabie Orogenic Belt, Central China: Evidence from Pb Isotope Geochemistry of Late Mesozoic Basalts[J].中国地球化学学报（英文版）,2002,21(2):147-155,9.基金项目
The study was funded by the National Natural Science Foundation of China (No. 49794043) and the Open Laboratory of Constitution, Interaction and Dynamics of the Crust-Mantle System, China. （No. 49794043）
