Abstract：The Silurian-Devonian in Susong area,Anhui Province are distributed in the western part of the Lower Yangtze stratigraphic subregion,the southeastern edge of the Dabie orogenic belt,and the eastern side of the southern end of the Tanlu fault zone. In order to obtain the provenance information of the Silurian-Devonian in Susong area,detrital zircon LA-ICP-MS U-Pb dating was performed on the fine sandstone and siltstone of the Fentou,Maoshan and Wutong formations exposed in Susong area. The results showed that the three samples all obtained major peak ages of about 970 Ma,820 Ma,and a secondary peak age of about 450 Ma. Detrital zircons are mainly derived from granitic rocks. Using the discriminant map of zircon in granite, most of dated zircons are recognized to be I-type and S-type granite zircons,while most of the Neoproterozoic and Caledonian granitic rocks in the Jiangnan orogenic belt and South China are type I and type S. Through comparison with the ages of detrital zircons from South China,the provenance of the studied strata mainly comes from the interior of the South China plate. Using the pattern map of the difference between zircon crystallization age and sedimentary age,the tectonic setting of the Silurian-Devonian in Susong area, Anhui Province was identified as the collision background.
Luo Li-Yuan,Li Shuang-Ying. Detrital-zircon provenance analysis and its tectonic significance of the Silurian-Devonian in Susong area,Anhui Province[J]. JOPC, 2021, 23(5): 999-1009.
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