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- W2557572583 abstract "The impact cratering process can produce significant changes in the geophysical signatures of planetary surfaces. In this context, the study of the magnetism associated to terrestrial impact structures can be an important tool to better understand the origin of magnetic anomalies in other planets and satellites, such as Mars and the Moon. But craters on basaltic rocks, similar to those found at the surface of these planetary bodies, are rare on Earth. The 12 km wide Vargeao is a well-preserved impact structure formed on volcanic rocks from the Serra Geral Formation (~133-131 Ma). This work is focused on the study of the magnetic proprieties of shocked-basalts found in Vargeao. We conducted a detailed magnetic study that comprises: anisotropy of low-field magnetic susceptibility (AMS), remanent magnetization measurements, alternate-field demagnetization (AF) and thermomagnetic curves. Our results show that magnetization inside and outside the impact structure is dominantly carrier by magnetite. But the values of almost all magnetic parameters change in the impacted zone, and have clear trends towards to the center of the impact structure. These results may be used to assess the different hypotheses about the genesis of magnetic anomalies on the Moon and in Mars's crust, include their magnetic carriers." @default.
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- W2557572583 date "2011-01-01" @default.
- W2557572583 modified "2023-10-05" @default.
- W2557572583 title "MAGNETIC PROPRIETIES OF SHOCKED-BASALTS OF THE VARGEÃO IMPACT STRUCTURE (SOUTH BRAZIL): PRELIMINARY RESULTS" @default.
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