Citation: | ZENG Wentao, LIU Guichun, FENG Qinglai, ZHAO Tianyu, YU Saiying, DENG Renhong, MO Xiong. The relationship between Lincang block and provenance of Nanduan Formation:Evidence of detrital zircon U-Pb dating from metasandstone of Devonian-Carboniferous Nanduan Formation[J]. Geological Bulletin of China, 2017, 36(7): 1175-1187. |
U-Pb ages of detrital zircons of Devonian-Carboniferous Nanduan Formation from Lincang block define three distinctive age peaks in older Grenvillian (1100~1300Ma), younger Grenvillian (900~980Ma) and Pan-African (530~680Ma), and two subordinate group in 1550~1730Ma and 2350~2630Ma, suggesting that the provenance of sediments had multi-source and complex characteristics. The age spectrum is obviously different from detrital zircon age spectrum of the Devonian-Carboniferous sediments of Simao block, which indicates that the sediments of Nanduan Formation came from East Ganwana supercontinent, and the result is indicated by paleobiology which shows a genetic relationship between East Ganwana and paleo-Tethys in southwest Yunnan.
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Tectonic map and geological map of the study area
The AD Bouma sequence constituted from Nanduan Formation at Nanduan Village
CL images of zircons in samples from the Nanduan Formation
Th/U ratios versus U-Pb ages of detrital zircons from the Nanduan Formaiton
U-Pb concordia diagrams and relative probility plots of detrital zircons from Nanduan Formation
Relative U-Pb age probability detrital zircons from different areas