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- GP43B-0357: Quantifying Magnetofossil Contributions to Magnetic Records and Sediment Provenance Reconstruction: a case from the Bengal Fan
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Board 0357‚ Hall EFG (Poster Hall)NOLA CC
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Rong Huang, Peking University (First Author, Presenting Author)
Environmental magnetism provides critical insights into sediment source identification, yet the presence of in-situ formed magnetofossils can significantly distort detrital magnetic signatures, potentially misleading sediment transport interpretations. This issue has not been well explored. Here, we examined surface sediments from the Bengal Fan which receives large amounts of materials transported from Asian continent to the northern Indian Ocean. We used magnetic measurements and electron microscopy to detect magnetofossils and to quantify their contributions to sedimentary magnetic signals. Our results show that magnetofossils are important magnetic carriers, especially in the southern parts of the fan, and they significantly affect the sediment magnetic properties to complicate sediment provenance determination. Our findings highlight the necessity of accounting for magnetofossils when applying environmental magnetism to detrital-dominated sedimentary systems.
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