The detrital rocks of the Meishan Group in Sanxianshan area of Jinzhai is located at the northern margin of the Dabie Mountains,and are mostly composed of lithic quartz sandstones and lithic quartz greywacke. The average contents of quartz,feldspar and lithite are 87.21%, 1.67%, 9.64%,respectively. The quartz is mainly single crystal quartz(95.79%),the feldspar is mainly plagioclase and the lithite is mainly sedimentary rock lithite(75.49%),followed by the metamorphic lithite(24.51%). The average contents of clastic rocks are SiO2 75.99%,Al2O311.96%,MgO 0.72%,CaO 0.10%,Fe2O3 4.02%,K2O 1.70%,Na2O 0.26%, ΣREE=170.49×10-6(74.49×10-6～309.42×10-6),LREE/HREE=11.16(7.89～14.26),light REE enrichment,δEu=0.72(0.59～0.90),δCe=0.84(0.42～0.97),La/Yb=22.08(13.01～31.18),(La/Yb)N=14.89(8.77～21.02). The geochemical characteristics of the clastic rocks indicates that the source rocks of the Meishan Group were ancient sedimentary rocks,felsic volcanic rocks and ancient metamorphic basement and uncovers a complicated tectonic settings composed of mainly passive continental margin and active continental margin,followed by continental island-arcs. The both the Meishan Group in the Sanxianshan and the Carboniferous in Shangcheng-Gushi area have different composition of source rocks and tectonic setting,which might imply the both to have different geological ages.
. Compositions of detrital rocks of the Meishan Group in Sanxianshan area of Jinzhai,Anhui Province：Significances of provenance tectonic attributes and the stratigraphic age[J]. Chinese Journal of Geology, 2014, 49(2): 668-683.