Uniformity of the upper Famennian Milankovitch cycle in China

Research on chemo-biostratigraphy reveals that the periodic fluctuation of Ce/La ratios in carbonate sequence may reflect Milankovitch 100 ka eccentricity cyclicity. The Ce/La curve of the upper Famennian of Huangmao (Guangxi) may be well correlated to that of Muhua (Guizhou) and of Mid-Tarim (Xinjiang). They correspond not only in curve-feature, but also in number of cycles. Huangmao and Mid-Tarim are now located 3 000 km apart, during the Devonian possibly they were located farther apart. This study proves that the simultaneous sedimentary record of Milankovitch eccentricity cycles with a recurrent interval of 100 ka may be traced at different long-range sites. These cycles simultaneously developed in different depositional settings among different facies suites as a result of regional to global climate forcing, thus supporting the Milankovitch Theory.