Citation: | HUANG Xiaoming, MOU Chuanlong, LUO Liang, CONG Feng, DONG Hui. 2023. U-Pb geochronology of the detrital zircons from the southern segment of the Changning-Menglian suture zone in western Yunnan: Constraints on sedimentary age and tectonic environment. Geological Bulletin of China, 42(7): 1069-1081. doi: 10.12097/j.issn.1671-2552.2023.07.002 |
Clarify the evolution characteristics of the Lincang Block, it is necessary to restrict the sedimentary age and tectonic environment of the Nanduan Formaiton.The U-Pb geochronology of detrital zircon in the Nanduan Formaiton is studied in this paper.The study shows that the age of the youngest group from the Nanduan Formation are 512 Ma and 509.6 Ma.The source has the characteristics of three age groups: Pan African period (680~530 Ma), late Greenville period (980~900 Ma) and early Greenville period (1300~1100 Ma).The results show that it is considered that the maximum sedimentary lower limit of the Nanduan Formaiton is Cambrian, and the upper limit of the middle and the upper part is Carboniferous.The provenance comes from at least three orogenic belts in the East Gondwana supercontinent, which is mainly the Pinjarra orogenic belt in Antarctica, the Albany Fraser orogenic belt in Western Australia and the Paterson-Peterman orogenic belt in eastern Australia, with a pro-Gondwana continental nature.In the reconstruction of Gondwana continent in Paleozoic, the Nanduan Formation is located on the northern edge of the Australian plot, which expervenced an evolutionary process from the western Australia Block to the eastern Australia Block, moving north to East, and transforming from the passive continental margin to the active continental margin.The early sedimentary environment was coastal shallow sea or delta, and the later stage is forearc accretionary wedge sedimentary environment.
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Tectonic maps(a, b) and geological map(c) of the study area
Lithologic histogram of Lincang Block
Measured section of the Nanduan Formation in Yanshuai Town
Field(a, b) and microscopic(c, d) photos of Nanduan Formation
Cathodoluminescence image of detrital zircon from Nanduan Formation
Zircon type discrimination diagrams(a, b), tectonic background diagrams(c, d) and REE distribution curves(e, f) of Nanduan Formation
Zircon U-Pb age concordance maps(a, c) and relative frequency distribution maps(b, d) of detrital zircon from Nanduan Formation
Spectrum comparison of detrital zircon U-Pb ages between Nanduan Formation and other related clastic rocks
Palaeogeographic location and evolution maps of Nanduan Formation