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Title:
Geochemistry of drill core samples from Yaxcopoil-1 Chicxulub impact crater, Mexico
Authors:
Schmitt, Ralf T.; Wittmann, Axel; Stöffler, Dieter
Affiliation:
AA(Institute of Mineralogy, Museum of Natural History, Humboldt-University of Berlin, Invalidenstrasse 43, D-10115 Berlin, Germany ), AB(Institute of Mineralogy, Museum of Natural History, Humboldt-University of Berlin, Invalidenstrasse 43, D-10115 Berlin, Germany), AC(Institute of Mineralogy, Museum of Natural History, Humboldt-University of Berlin, Invalidenstrasse 43, D-10115 Berlin, Germany)
Publication:
Meteoritics & Planetary Science, Vol. 39, No. 6, p.979-1001
Publication Date:
06/2004
Origin:
M&PS
DOI:
10.1111/j.1945-5100.2004.tb00940.x
Bibliographic Code:
2004M&PS...39..979S

Abstract

The chemical composition of suevites, displaced Cretaceous target rocks, and impactgenerated dikes within these rocks from the Yaxcopoil-1 (Yax-1) drill core, Chicxulub impact crater, Mexico, is reported and compared with the data from the Yucatán 6 (Y6) samples. Within the six suevite subunits of Yax-1, four units with different chemical compositions can be distinguished: a) upper/lower sorted and upper suevite (depth of 795-846 m); b) middle suevite (depth of 846-861 m); c) brecciated impact melt rock (depth of 861-885 m); and d) lower suevite (depth of 885-895 m). The suevite sequence (a), (b), and (d) display an increase of the CaO content and a decrease of the silicate basement component from top to bottom. In contrast, the suevite of Y6 shows an inverse trend. The different distances of the Yax-1 and Y6 drilling sites from the crater center (~60, and ~47 km, respectively) lead to different suevite sequences. Within the Cretaceous rocks of Yax-1, a suevitic dike (depth of ~916 m) does not display chemical differences when compared with the suevite, while an impact melt rock dike (depth of ~1348 m) is significantly enriched in immobile elements. A clastic breccia dike (depth of ~1316 m) is dominated by material derived locally from the host rock, while the silicate-rich component is similar to that found in the suevite. Significant enrichments of the K2O content were observed in the Yax-1 suevite and the impact-generated dikes. All impactites of Yax-1 and Y6 are mixtures of a crystalline basement and a carbonate component from the sedimentary cover. An anhydrite component in the impactites is missing (Yax-1) or negligible (Y6).
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