This article presents clay minerals and major elements data of Miocene red clay from
Zhuanglang core (ZL) from the eastern Longzhong Basin, China. The dataset including
the contents of main clay minerals such as smectite, kaolinite, illite and chlorite
and other important clay minerals parameters as illite crystallinity, Illite 5 Å/10 Å,
kaolinite/(illite +chlorite) ratio and major elements and its ratio as SiO2, Al2O3, MgO, Na2O, K2O, K2O/Al2O3 and SiO2/Al2O3 in the Mid-Miocene climatic optimum (MMCO). The X-ray diffraction (XRD) and X-ray
Fluorescence (XRF) experiments were made at the State Key Laboratory of Loess and
Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences. The
data provide the evidence for understanding the MMCO and its driving factors.