Geochemical signals of the Late Jurassic, marine Mjolnir impact

Details Geochemical signals of the Late Jurassic, marine Mjolnir impact Geochemical signals of the Late Jurassic, marine Mjolnir impact

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999m%26ps...34..393d&link_type=abstract

Meteoritics & Planetary Science, vol. 34, no. 3, pp. 393-406 (1999).

Physics

13

Scientific paper

Of the only seven submarine impact craters that have been found globally, the Mjolnir Crater is one of the best preserved and retails crater and ejecta. Geochemical studies (organic pyrolysis: Rock Eval, major elements, Co, Cr, Ir, Ni, Pb, Rb, Sr, Th, U, V, Zr, Y) of the IKU (Institute for Petroleum Research) core 7430/10-U-01, which is located about 30 km north-northeast of the crater-rim show gradual establishment of anoxic sea floor conditions through the late Jurassic. These poorly ventilated water conditions were overturned due to the Mjolnir impact event. Waves and currents transported impact glass, which is now partly weathered to smectite, into the depositional area where the drillhole is located. The succeeding crater collapse transported impact material (e.g., shocked quartz and iridium) from the crater rim and deeper levels to the core site. Normal marine depositional conditions were established a short time after the crater collapsed.

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