The Sedimentary Characteristics and Models of Paleogene Tempestites in Huimin Sag,Shandong Province

Thetempestites of Paleogene in Huimin sag was discussed based on cores,rock thin section,granularity analysis and log data.Itcan be seenthat the tempestites in the area studied exist lots of rock types,such as clastic rocks,bioclastic limestone and volcaniclastic rock.The cumulative probability plots and sedimentary structures reflect that the transportation medium hascharacters of tractive current and gravity flow synchronously.The formerhas high slope-multi-bouncing population-1 suspension population pattern,multi-segments pattern and high slope 1 pattern.The latter has gutter cast,surface of scour,graded bed,massive bedding,hummocky cross stratification(HCS),parallel bedding,ripples,contemporaneous deformation and Fugichnia.The vertical sequence of the tempestites in the studyarea is Sa1-graded bed segment,Sa2-homogeneous bedding segment,Sb-biggish wave-ripple beddingsegment,Sc-parallel bedding and HCS segment,Sd-wavy bedding segment,Se-mudstone segment and Sfnatural lake faciesclay rock segment upwards.There are four sedimentary modelsincludingautochthonous coarse grain rocks,near source tempestites A,near source tempestites B and distal tempestites.