Ore-bearing rock series of Liangshan Formation bauxite in Kaili—Huangping area,southeast Guizhou
Both the Dazhuyuan Formation(C2d)in northern Guizhou—southern Chongqing and the Liangshan Formation(P2l)in Kaili—Huangping area of southeastern Guizhou are bauxite-bearing rock series,which are rich in spore pollen.According to the identification of sporopollen experts,the Dazhuyuan Formation is produced in the Carboniferous.Combined with the geological characteristics of the Dazhuyuan Formation and the underlying Upper Carboniferous Huanglong Formation(C2h)or the Lower Silurian Hanjiadian Formation(S1hj),as well as the overlying Middle Permian Liangshan Formation(P2l),it is confirmed that the sedimentary age of the Dazhuyuan Formation is the Late Carboniferous Xiaoyao Age,namely the Kasimovian—Gescher Age.The Liangshan Formation overlying the Dazhuyuan Formation in northern Guizhou and southern Chongqing and the Liangshan Formation in the Kaili—Huangping area are very rich in spores and pollen.According to the identification of spore—pollen experts,the sedimentary age is the early Middle Permian Luodian Age,namely the early Kungurian.In the sixth chapter"Kaili-type bauxite"of the book China Mineral Geology·Guizhou Volume·Bauxite(2019),the original Middle Permian Liangshan Formation in Kaili—Huangping area is dismembered into two parts without geological basis:the carbonaceous shale,coal seam and sandstone in the upper part of the original Liangshan Formation are still called the Middle Permian Liangshan Formation(P2l);the bauxite,bauxitite in the middle section of the original Liangshan Formation and the iron clay rock and siderite layer in the lower section were changed to the Lower Permian Dazhuyuan Formation(P1d),and its sedimentary age was determined to be late Early Permian Zisong age—Longlin age,that is,Sakmar Age—Adingska Age.In this way,it will cause confusion to the stratigraphic unit of the Middle Permian Liangshan Formation in Guizhou Province,which has been used for many years,has a clear definition,and is supported by strata and substrata,which deserves serious attention.
Dazhuyuan FormationLiangshan Formationore bearing rock series of bauxitespore pollennorth Guizhou—south ChongqingKaili—Huangping
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维普
