Re-determination of the initiation time of the seafloor spreading of the Central Basin,South China Sea
There are a lot of disputes over the initiation time of seafloor spreading in the Central Basin of South China Sea by comparison of magnetic lineations due to its multiplicity.It is necessary to re-define this important node of time because of data and new result accumulation in the SCS during the recent decades.It has been verified by this study that the Late Eocene and early Oligocene strata(T7—Tog sequence)developed at southern and northern sides of initial spreading areas in the Central Basin,which indicates that the geological age of bottom stratum on oceanic basement was older than 32-33 Ma.At continental margins of the SCS,the structure movement of long lasting time,intensively activity and forming a structure system of E-W trend in the SCS took place approximately at 40 Ma,and it is more precise to take seismic reflector T8(37.2-40 Ma)as the break-up of the initial seafloor spreading of the Central Basin according to the comparison of unconformities.Therefore,the conclusion is the initial time of seafloor spreading of the Central basin was roughly 39-40 Ma.
initial time of seafloor spreadingcomparison of magnetic lineationsoceanic basementstructure system with E—W trendCentral Basin of the SCS
万方数据
维普
