Material Differentiation and Its Response to the "PETM"Events in Continental Fault Lake during the Early Paleogene Period:A Case Study of Kongdian Formation in Jiyang Depression
Abstract：Paleocene Eocene climate (PETM)events in Early Paleogene period on the Earth had serious impact on the global carbon cycle process and the terrestrial and marine ecological environment system.In this paper,on the basis of general thin-sections,elemental analysis ,carbon isotope,TOC et al.,the impact of Paleocene Eocene lake environment of Jiyang rifted ba-sin,Bohai bay on the temporal and spatial variation and response of "PETM"is studied,and it is found Jiyang basin experi-enced early multicycle evolution processes,detrital material and chemical differentiation occurred at the same time in lacustrine basin,and terrestrial weathering and chemical sedimentary differentiation indicates the change of extreme climate.In this peri-od,the lake water experienced gradual salinization characterized by the spatial zoning and time-evolution stage,which is a direct response to the occurrence of hot climate events.Time-space evolution of the lake was subj ect to "PETM"events.The lake was not fully salty in the early events with prosperous plankton.Early phytoplankton absorption of 12CO2 led to the higher produc-tivity in the ancient Lake,which dropped to a minimum with the lake turning increasingly salty and more difficult for the sur-vival.δ13C of lacustrine sedimentary records are in obvious negative bias due to excessive 12C absorption and precipitation,re-sulting in,a maximum of 5‰.It is confirmed that global "PETM"events affected the time-space evolution and differentiation process of material in Jiyang depression during Paleocene-Eocene.
Keywords："PETM"eventsenvironmental fluctuationscontinental fault LakeEarly Paleogene periodJiyang depressionpetroleum geology.
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：16( 1893-1908 )