Basic characteristics of key interfaces in Upper Ordovician Wufeng Formation - Lower Silurian Longmaxi Formation in Sichuan Basin and its periphery, SW China
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Basic characteristics of key interfaces in Upper Ordovician Wufeng Formation - Lower Silurian Longmaxi Formation in Sichuan Basin and its periphery, SW China |
| WANG Yuman,WANG Hongyan,QIU Zhen,SHEN Junjun,ZHANG Qin,ZHANG Leifu,WANG Canhui,LI Xinjing |
| Fig. 7. Sections and GR response of two types of bentonite dense sections of Wufeng Formation-Longmaxi Formation in Sichuan Basin and its periphery (the geological hammer is 33 cm long, and the arrows point to bentonite layer). (a) The bentonite dense section in middle LM5 of Bailu section in Wuxi. Arrows point to thin-layer bentonite, with a single layer thickness of 0.5-3.0 cm, sandwiched in 1.2 m thick black shale; (b) GR response characteristics of the bentonite dense section in middle LM5 of Bailu section in Wuxi; (c) Thick bentonite (8 cm) in LM6 of Heizhugou section in Ebian, intercalated in carbonaceous shale; (d) GR response characteristics of LM6 thick bentonite in Heizhugou section in Ebian. LM5-Coronograptus cyphus graptolite belt; LM6-Demirastrites triangulatus graptolite belt. |
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