A Correlation between Magnetic Susceptibility and the Content of Different Grain Sizes of XH1# Core in North Jiangsu Basin and Its Significance

Key words: 
• susceptibility /
• grain size /
• correlation /
• northern Jiangsu basin

Abstract: Based on the synthetic study on the correlations between magnetic susceptibility and the content of the different grain size〖KG*2〗of XH1# core in northern Jiangsu basin, this paper shows that the correlation is different〖KG*2〗in various depth: 350~247m, the mass susceptibility correlates negatively with〖KG*2〗mid-grain sizes, but correlates positively with the content〖KG*2〗of 4~12Φ; 234~0m, the mass susceptibility correlates positively with〖KG*2〗mid-grain sizes, and correlates positively with the content〖KG*2〗of 1~3Φ; The depth of 247~234m is the transition period of the transform of the correlations between magnetic susceptibility and the content of the different grain size.〖KG*2〗The results of environmental magnetism research〖KG*2〗show that the components〖KG*2〗of magnetic mineral are also different〖KG*2〗in the upper stratum(234~0m) and the lower stratum(350~247m). The difference〖KG*2〗of the correlations between magnetic susceptibility and the content of the different grain size,〖KG*2〗and the components〖KG*2〗of magnetic mineral in various depth reveal that, in the course〖KG*2〗of the sediment deposition in the depth 247~234m, one great event may have happened in Northern Jiangsu Basin, this event led to the change of detrital sediment〖KG*2〗origin.