Modeling of the Central Magnetic Anomaly at Haughton Impact Structure, Canada

Details Modeling of the Central Magnetic Anomaly at Haughton Impact Structure, Canada Modeling of the Central Magnetic Anomaly at Haughton Impact Structure, Canada

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p34a..04q&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #P34A-04

Mathematics

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[1517] Geomagnetism And Paleomagnetism / Magnetic Anomalies: Modeling And Interpretation, [1595] Geomagnetism And Paleomagnetism / Planetary Magnetism: All Frequencies And Wavelengths, [5420] Planetary Sciences: Solid Surface Planets / Impact Phenomena, Cratering

Scientific paper

Located on Devon Island, Nunavut, Canada, the 23-km diameter Haughton impact structure is one of the best-preserved medium-size complex impact structures on Earth. The impact occurred ~39 Ma ago into a target formation composed of an ~2-km thick sequence of Lower Paleozoic sedimentary rocks of the Arctic Platform overlying Precambrian metamorphic basement of the Canadian Shield (Osinski et al., 2005). Clast-rich impact melt rocks line the crater and impact-induced hydrothermal activity took place, but since then no significant geological event has affected the area. In the 1980s, ground magnetic and gravity measurements were carried out within the central part of the crater (Pohl et al., 1988). A significant anomaly was discovered and coarsely modeled by a source body of simple geometry. More recently, an airborne magnetic survey delivered additional data that covered the whole crater but no modeling was done (Glass et al., 2002). Here, we present the results of a new ground magnetic survey accompanied by rock magnetic property measurements made on all samples of the crater. This has provided additional constraints to investigate the origin of this central magnetic anomaly. By conducting modeling, we have been able to reveal the geometry and volume of the source body as well as its magnetization properties. Our results suggest that the necessary magnetization intensity to account for this anomaly is too large to be associated with uplifted pre-impact target rocks. Therefore, we suggest that hydrothermal alteration could have enhanced the magnetization of the central part of this crater. References : Osinski, G. R. et al. 2005. MPS, 40:1759-1776 ; Pohl, J. et al. 1988. Meteoritics, 23:235-238 ; Glass, B. J. et al. 2002, Abstract #2008. 33th LPSC

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