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 ...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.展开更多
The simultaneity and the regionality of the chemo-cycles are proved by cycle-to-cycle correlation integrated with conodont biostratigraphic correlation of the upper part of the Givetian (Devonian) between Liujing and ...The simultaneity and the regionality of the chemo-cycles are proved by cycle-to-cycle correlation integrated with conodont biostratigraphic correlation of the upper part of the Givetian (Devonian) between Liujing and Dale. The study indicates that these chemo-cycles with time spans of 0.10 Ma have an internal relation with paleoclimatic changes, and it might have an origin through Milankovitch eccentricity cyclicity.展开更多
文摘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.
文摘The simultaneity and the regionality of the chemo-cycles are proved by cycle-to-cycle correlation integrated with conodont biostratigraphic correlation of the upper part of the Givetian (Devonian) between Liujing and Dale. The study indicates that these chemo-cycles with time spans of 0.10 Ma have an internal relation with paleoclimatic changes, and it might have an origin through Milankovitch eccentricity cyclicity.
