Effects of astronomical orbital cycle and volcanic activity on organic carbon accumulation during Late Ordovician-Early Silurian in the Upper Yangtze area, South China

ZHANG Xi,ZHANG Tingshan,ZHAO Xiaoming,ZHU Haihua,MIHAI Emilian Popa,CHEN Lei,YONG Jinjie,XIAO Qiang,LI Hongjiao

Fig. 9. Volcanic activities and redox environment. (a), (c), (e) Relationships between TOC and Th/U, V/(V+Ni) and V/C in E4 period of Jienietuo section and Lücongpo section; (b), (d), (f) Relationships between TOC and Th/U, V/(V+Ni) and V/C in E1 period of Jienietuo section and Lücongpo section.