摘要
The Daqing Mountains area comprises a typical occurrence of the Khondalite Belt in the Western Block of the North China Craton (NCC). In this area, both early and late Paleoproterozoic metasedimentary rocks have been identified in what was originally called the Upper Wula Mountains "Subgroup". Six metasedimentary rock samples yielded SHRIMP U-Pb zircon ages of 2.56-2.04 Ga for detrital and 1.96-1.83 Ga for metamorphic zircons. Based on these data and previously published results, the following conclusions can be drawn: 1) The source region for the late Paleoproterozoic detrital sedimentary rocks is mainly 2.55 2.4 and 2.2 2.04 Ga in age, consistent with the early Precambrian geological history identified widely in the basement of the NCC. 2) The majority of sedimentary rocks of the khondalite series were deposited between 2.04 and 1.95 Ga, and then in a protracted period (1.96 and 1.83 Ga) underwent a complex history of amphibolite to granulite-facies metamorphism.
The Daqing Mountains area comprises a typical occurrence of the Khondalite Belt in the Western Block of the North China Craton （NCC）. In this area, both early and late Paleoproterozoic metasedimentary rocks have been identified in what was origi- nally called the Upper Wula Mountains ＂Subgroup＂. Six metasedimentary rock samples yielded SHRIMP U-Pb zircon ages of 2.56-2.04 Ga for detrital and 1.96-1.83 Ga for metamorphic zircons. Based on these data and previously published results, the following conclusions can be drawn： 1） The source region for the late Paleoproterozoic detrital sedimentary rocks is mainly 2.55-2.4 and 2.2-2.04 Ga in age, consistent with the early Precambrian geological history identified widely in the basement of the NCC. 2） The majority of sedimentary rocks of the khondalite series were deposited between 2.04 and 1.95 Ga, and then in a protracted period （1.96 and 1.83 Ga） underwent a complex history of amphibolite to granulite-facies metamorphism.
基金
supported by National Natural Science Foundation of China (Grant No.41002062)
Scientific Research Program of the Ministry of Science and Technology of China (Grant No. J0901)
the Key Program of the Land and Resource Ministry of China (Grant Nos. 1212011120151,1212010811033, 1212010711815)
