TY - JOUR
T1 - U-Pb and Hf isotopic study of detrital zircons from the Yejishan group of the Lüliang Complex
T2 - constraints on the timing of collision between the Eastern and Western Blocks, North China Craton
AU - Liu, Chaohui
AU - Zhao, Guochun
AU - Sun, Min
AU - Wu, Fuyuan
AU - Yang, Jinhui
AU - Yin, Changqing
AU - Leung, Wing Hang
PY - 2011/4/15
Y1 - 2011/4/15
N2 - The Trans-North China Orogen is a recently recognized continent-continent collisional belt along which the discrete Eastern and Western Blocks amalgamated to form the coherent basement of the North China Craton. However, there is a hot debate on the timing of the collision between the two blocks, with one school of thought arguing the collision occurred at 2.5Ga, whereas others believe it took place at ~1.85Ga. U-Pb ages and Hf isotopic data of detrital zircons from foreland basins in the Trans-North China Orogen can provide rigorous constraints on this controversial issue. One of such foreland basins is represented by the Yejishan Group in the Lüliang Complex in the middle sector of the western margin of the Trans-North China Orogen. The group consists of conglomerates, quartz wackes, sandstones and minor limestones, most of which contain large amounts of detrital zircons. CL images reveal that nearly all detrital zircons from the Yejishan Group possess oscillatory zoning, with Th/U ratios of 0.2-2.34, typical of an igneous origin. The 207Pb/206Pb ages of detrital zircons range between 3.24 and 1.81Ga, with most having Paleoproterozoic ages, of which the youngest group ages are around 1.87-1.81Ga. This indicates that the foreland basin in which the Yejishan Group was deposited must have formed not earlier than 1.87-1.81Ga, thus supporting the collision between the Eastern and Western Blocks at ~1.85Ga, not at ~2.5Ga.
AB - The Trans-North China Orogen is a recently recognized continent-continent collisional belt along which the discrete Eastern and Western Blocks amalgamated to form the coherent basement of the North China Craton. However, there is a hot debate on the timing of the collision between the two blocks, with one school of thought arguing the collision occurred at 2.5Ga, whereas others believe it took place at ~1.85Ga. U-Pb ages and Hf isotopic data of detrital zircons from foreland basins in the Trans-North China Orogen can provide rigorous constraints on this controversial issue. One of such foreland basins is represented by the Yejishan Group in the Lüliang Complex in the middle sector of the western margin of the Trans-North China Orogen. The group consists of conglomerates, quartz wackes, sandstones and minor limestones, most of which contain large amounts of detrital zircons. CL images reveal that nearly all detrital zircons from the Yejishan Group possess oscillatory zoning, with Th/U ratios of 0.2-2.34, typical of an igneous origin. The 207Pb/206Pb ages of detrital zircons range between 3.24 and 1.81Ga, with most having Paleoproterozoic ages, of which the youngest group ages are around 1.87-1.81Ga. This indicates that the foreland basin in which the Yejishan Group was deposited must have formed not earlier than 1.87-1.81Ga, thus supporting the collision between the Eastern and Western Blocks at ~1.85Ga, not at ~2.5Ga.
KW - detrital zircon
KW - foreland basin
KW - Lüliang Complex
KW - North China Craton
KW - paleoproterozoic
KW - Trans-North China Orogen
UR - http://www.scopus.com/inward/record.url?scp=79952581622&partnerID=8YFLogxK
U2 - 10.1016/j.sedgeo.2011.01.001
DO - 10.1016/j.sedgeo.2011.01.001
M3 - Article
AN - SCOPUS:79952581622
SN - 0037-0738
VL - 236
SP - 129
EP - 140
JO - Sedimentary Geology
JF - Sedimentary Geology
IS - 1-2
ER -