Institute of Geology and Geophysics, Chinese Academy of
Sciences, Beijing 100029, China
Methods for
calculating ancient eustatic change amplitudes according to reef
fabric- facies are proposed, with a new method for determining
sediment-loading subsidence. Compared with methods based on non-reefal
deposits, these methods are more accurate in restoration of
original sediment thickness, determination of sediment-loading
subsidence, as well as restoration of ancient water depth.
According to the reef in Guangxi, China, the amplitude of
sea-level rise during Middle Permian (Neoschwagerina-Yabeina
zone) is 249.5 m. According to the coeval reef of the Guadalupe
Mountains, New Mexico and Texas, the coeval sea-level rise is
247 m. With these effective methods available, it is feasible to
establish more accurate eustatic curve of Phanerozoic.