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The close resemblance of magnetic susceptibility of Scotia Sea sediments and Antarctic ice core dust records provoke the assumption of Patagonia dust as the main contributor to the magnetic signal in the sediments.However,without detailed magnetic minerology investigation,this assumption remains arbitrary.In this study,we performed First Order Reverse Curves(FORCs)measurements and Hard Isothermal Remanent Magnetization(HIRM)and S-ratio analysis on glacial and interglacial Scotia Sea sediments in order to analyze the contributions of different magnetic minerals.Our results show dominant contribution of biogenic magnetites to the interglacial sediments,and significant increase of detrital origin during the glacials.However,the HIRM and S-ratio data suggest the high coercive mineral(e.g.hematite)only contribute 3~7%of the total magnetic intensity,suggesting dust is not the main contributor to the magnetic signal in the Scotia Sea sediments.