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《Marine Geology & Quaternary Geology》 2002-01
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QUANTITATIVE STUDY ON INVERSION STRUCTURES IN XIHU DEPRESSION,EAST CHINA SEA: CONSTRAINTS FROM FISSION TRACK ANALYSIS DATA

ZHOU Zu-yi 1,JIA Jian-yi 2,LI Jia-biao 3,YANG Feng-li 1 ( 1MOU Laboratory of Marine Geology,Tongji University,Shanghai 200092,China; 2Shanghai Offshore Petroleum Bureau,CNSPC,Shanghai 200120,China; 3Key Laboratory of Sea-floor Science,SOA,  
Fission track analysis is carried out on eleven apatite samples and six zircon samples from five drilling wells(from north to south,wells XL1,XL2,XH,XY and XT)of Xihu depression,East China Sea.The samples are from Oligocene,Miocene and Pliocene strata.The median fission track ages of all zircon samples are older than the respective strata ages,reflecting that the maximum burial temperature is less than(225±25) ℃ for these samples.Apatite fission track ages exhibit a complicate pattern,with FT ages from wells XT and XY in the south larger than and FT ages from wells XH,XL2, XL1 smaller than ages of the respective strata.The distribution of these ages show that the maximum burial depth in the north part of the depression is greater than that in the south,reflecting that the degree of inversion increases northwards.The amount of uplift and erosion is also estimated quantitatively for those wells where apatite fission track ages are smaller than the strata ages.Despite of an integrated analysis of vitrinite reflectance,sonic velocity is required for a good estimation of the amount of erosion for these wells.Our preliminary analysis of FT data shows that the amount of erosion for wells of XH and XL1 is less than 1 786 m.
【Fund】: 国家自然科学基金项目 ( 4 9876 0 13);; 国家重点基础研究发展规划资助项目 ( G2 0 0 0 0 476 0 4
【CateGory Index】: P736.15
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