Apatite Fission Track Constrains on Denudation since Late Cretaceous in Central Uplift,South Yellow Sea Basin
Pang Yumao
Guo Xingwei
Han Zuozhen
Zhang Xunhua
Zhu Xiaoqing
Abstract：Significant tectonic uplift and denudation occurred in central uplift of the South Yellow Sea basin (SYSB)since Late Cretaceous.Based on the drilling cores of CSDP-2 well which is supported and carried out by the Continental Scientific Drilling Project (CSDP)of China Geological Survey (CGS),the denudation and related characteristics of thermal history since Late Cretaceous in central uplift of SYSB were analyzed by apatite fission track (AFT)technique.The eight AFT ages obtained show two age groups,with one at (38±3)Ma,and the others ranging from (52±4)Ma to (65±5)Ma which all are much younger than the age of Permian where all samples locate,indicating that the samples were completely annealed and recorded the thermal history since Late Cretaceous.Modeling results of thermal history show that the peak paleo-geotemperature calcu-lated by testing data of vitrinite reflectance (Ro)is within the range of the temperature interval of annealing zone of AFT.All samples suffered continuous cooling processes from the early stage of Late Cretaceous (ca.100 Ma)and started to enter into partial annealing zone (PAZ)at about 80—75 Ma.The first rapid cooling process began at the end of Late Cretaceous,and con-tinued to the Early Paleocene,then was followed by a stage of slow cooling process during Paleogene.Some samples show the other rapid cooling process which is weaker than the first that occurred from the Late Oligocene to Early Miocene.The AFT ages and modeling results of thermal history significantly show the denudation and related characteristics since Late Cretaceous in central uplift of SYSB.
Keywords：central uplift of South Yellow Sea basindenudationapatite fission tracklow-temperature thermochronologypetroleum geology
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 1921-1930 )