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2018 | 9 | 145-149
Article title

Badania magnetyczne krateru Lonar

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EN
Magnetic survey of Lonar crater
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PL
Abstracts
EN
Lonar crater in India, centered at 19.97°N and 76.50°E is relatively young (few tens of thousands years) and, thus, well preserved meteorite impact structure. This 1.88-km-diameter simple structure has been formed into the 66 Ma old Deccan traps. As the target of Lonar is magnetically homogeneous, it is a perfect site to study the effect of relatively small impact event into the magnetic properties of rocks, and the magnetic field. In October 2017, has been performed ground magnetic mapping of Lonar with help of two proton precession magnetometers. The mapping was done in a squared area of about 36 km2 (6´6 km) including the crater depression, rims, and surrounding terrain. Magnetic map (not corrected for latitude) reveals a circular negative anomaly more than 1000 nT in amplitude, which corresponds to the crater depression. The negative anomaly is surrounded by semicircular feature of up to 500 nT positive anomalies that correlate with present rim of the crater. The total diameter of the Lonar magnetic anomalies is about 2.25 km, which is just 20% more compared to the crater rim-to-rim diameter.
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Year
Volume
9
Pages
145-149
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author
References
  • Fredriksson K., Dube A., Milton D., Balasundaram M., 1973a, Lonar Lake, India: An impact crater in basalt, Science, 180, s. 862–864.
  • Fudali R.F., Milton D.J., Fredriksson K., Dube A., 1980, Morphology of Lonar Crater, India: Comparisons and implications, The Moon and the Planets, 23, s. 493–515.
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  • Maloof A.C., Stewart S.T., Weiss B.P., Soule S.A., Swanson-Hysell N.L., Louzada K.L., Garrick-Bethell I., Poussart P.M., 2010, Geology of Lonar Crater, India, Geological Society of America Bulletin, s. 109–126.
  • Nayak V.K., 1972, Glassy objects (impactite glasses?): A possible new evidence for meteoritic origin of the Lonar Crater, Maharashtra State, India, Earth and Planetary Science Letters, 14, s. 1–6.
  • Nayak V.K., 1993, Maskelynite from the Indian impact crater at Lonar, Journal of the Geological Society of India, 41, s. 307–312.
  • Sengupta D., Bhandari N., 1988, Formation age of the Lonar Crater, Houston, Texas, 19th Lunar and Planetary Science Conference, Lunar and Planetary Institute, s. 1059–1060.
  • Storzer D., Koeberl C., 2004, Age of the Lonar Impact Crater, India: First results from fi ssion track dating, Houston, Texas, 35th Lunar and Planetary Science Conference, Lunar and Planetary Institute, Abstract no. 1309.
Document Type
article
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YADDA identifier
bwmeta1.element.psjd-46c630f8-7c18-491c-aacc-58ae60e44f67
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