| Abstract: | 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. |
