The suevite of the Chicxulub impact crater

: A petrographical and geochemical comparison between the IODP Hole M0077A, the ICDP Hole Yaxcopoil-1, the UNAM cores and the remaining PEMEX core fragments

Scriptie/masterproef: Master's Thesis

Uittreksel

The Chicxulub impact crater was formed 66 million years ago when a meteorite hit the earth and caused a global extinction event.
In 2016, the drilling campaign was launched by the International Ocean Discovery Program and the International Continental Drilling Program just off the coast of the Yucatan peninsula to drill the peak ring of the Chicxulub impact crater. This drilling campaign gave researchers the unique opportunity to work on rare lithologies, like suevites. This can give us great insight in the impact cratering processes on earth as well as on other planets.
In this research the suevite section, a polymict impact breccia with a clastic matrix that contains melt particles, is investigated using optical microscopy and μXRF to characterize the clasts, the matrix and the deposition method. The suevite is characterized by subangular to angular glass, carbonates, fossils, granite, gneiss, calcite and quartz clasts. These clasts are in a carbonate matrix. The suevite has been subject to multiple types heavy alteration. The core was compared to other drill cores, Yaxcopoil-1, Yucatan-6 and the UNAM cores, within and in close proximity of the Chicxulub crater using the remaining core samples.
The suevite can be subdivided into two global fining upward sequences (617 – 658 mbsf and 658 – 721 mbsf) divided by an erosional feature. The upper section is interpreted to be deposited by the washback tsunami while the lower section was deposited by the density current of the ejected material.
Datum Prijs2018
TaalEnglish
Toekennende instantie
  • KU Leuven
BegeleiderPhilippe Claeys (Promotor), Steven Goderis (Co-promotor), Pim Kaskes (Advisor) & Sietze Jan De Graaff (Advisor)

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