| Citation: | Zhengqin Gan, Qinglai Feng, Yuehua Wei, Guichun Liu, Xiaomei Nie, Tianyu Zhao. Detrital Zircon of Devonian Sandstones in Changning-Menglian Suture Zone, Yunnan, SW China: Implications for the Early Evolution of Paleo-Tethys. Journal of Earth Science, 2024, 35(3): 786-796. doi: 10.1007/s12583-021-1470-7
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The Changning-Menglian suture zone is a critical tectonic belt pivotal to the evolution of the Paleo-Tethys. The Wenquan Formation, characterized as turbidite deposited on the western side of the Changning-Menglian suture zone as well as the eastern edge of the Baoshan Block. Analysis of detrital zircons from the Wenquan Formation reveals two significant age peaks approximately at 440 and 980 Ma, with additional age populations around 600, 780, and 2 500 Ma. The major age peak at about 440 Ma is come from the andesitic-dominant volcanic arc within the Lancang Block and the western Simao Block, corroborated by the presence of andesite fragments in thin section studies. Meanwhile, the zircons that form the secondary age peak at ~980 Ma and other older age groups probably originate from the Baoshan Block. Deposited on the western side of the Paleo-Tethyan ophiolites, the Wenquan Formation received detrital materials from the continental margin on the opposite side. Thus, the main Paleo-Tethyan Ocean basin was not sufficiently broad enough to cut off the transference of detrital materials. It was a relatively narrow basin in the Early Devonian.
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