Geochemistry of drill core samples from Yaxcopoil‐1, Chicxulub impact crater, Mexico

Schmitt, Rüdiger; Wittmann, A.; Stöffler, D.

doi:10.1111/j.1945-5100.2004.tb00940.x

Cited by 34 publications

(48 citation statements)

References 42 publications

(133 reference statements)

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“…The same trend is present in the whole rock data of Schmitt et al (2004). It should, therefore, represent a distinct characteristic of the impact melt rock dikes.…”

Section: Major Element Concentrationsmentioning

confidence: 69%

“…With the exception of the unusual black clastic polymict dike breccia, all other analyzed dike lithologies are distinctly enriched in the potassium content in comparison to their host rocks. This is probably due to a strong hydrothermal overprint Schmitt et al 2004). …”

Section: Geochemistry Whole Rock Datamentioning

confidence: 99%

“…X-ray fluorescence analyses of selected dike samples of Yax-1 are presented in Schmitt et al (2004). The chemical composition of the suevitic dike breccia at 916 m does not show significant differences to that of the Yax-1 suevite-type units.…”

Section: Geochemistry Whole Rock Datamentioning

confidence: 99%

“…16. Trace element ratio plot for whole rock X-ray fluorescence data after Schmitt et al (2004). The average shale composition is after Turekian and Wedepohl (1961).…”

Section: Major Element Concentrationsmentioning

confidence: 99%

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Impact‐related dike breccia lithologies in the ICDP drill core Yaxcopoil‐1, Chicxulub impact structure, Mexico

Wittmann

Kenkmann

Schmitt

et al. 2004

Meteorit & Planetary Scien

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Abstract-Petrographic descriptions of three dike breccia lithologies from drill core Yaxcopoil-1 (Yax-1) are presented. They occur within allochthonous units of displaced sedimentary megablocks of the Chicxulub impact structure. The suevitic dike breccias are the uppermost dike lithology. They contain melt rock particles and melt injections into the dike groundmass. Shock features occur ubiquitously and indicate a strong thermal annealing. Flow textures suggest a highly energetic emplacement process, possibly during the excavation stage as a ground-surge related deposit. The impact melt rock dikes are present in a strongly brecciated megablock interval as flow textured, anastomozing veinlets of impact melt rock that were altered to clay minerals. The melt impregnated a dolomitic host rock, indicating a low viscosity and, thus, high initial temperatures. Brecciation of the impact melt rock dikes occurred while they were still below the glass transition temperature, suggesting that dynamic conditions prevailed shortly after the emplacement process. Major element data indicates that the impact melt rock dikes differ in composition from the homogenized impact melt rock of Chicxulub. This could point to an emplacement during the late compression or early excavation stages of cratering. The clastic polymict dike breccias are coeval with pervasive brittle fracturing of the host rocks. They bear clasts including some crystalline basement and possible melt rock particles in a fine-grained dolomite matrix with turbulent flow textures. Fabric and texture indicate a granular flow at ambient pressures. Such conditions could be envisaged for the excavation phase while the transient cavity grew and fractures opened.

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“…The same trend is present in the whole rock data of Schmitt et al (2004). It should, therefore, represent a distinct characteristic of the impact melt rock dikes.…”

Section: Major Element Concentrationsmentioning

confidence: 69%

Section: Geochemistry Whole Rock Datamentioning

confidence: 99%

Section: Geochemistry Whole Rock Datamentioning

confidence: 99%

“…16. Trace element ratio plot for whole rock X-ray fluorescence data after Schmitt et al (2004). The average shale composition is after Turekian and Wedepohl (1961).…”

Section: Major Element Concentrationsmentioning

confidence: 99%

See 2 more Smart Citations

Impact‐related dike breccia lithologies in the ICDP drill core Yaxcopoil‐1, Chicxulub impact structure, Mexico

Wittmann

Kenkmann

Schmitt

et al. 2004

Meteorit & Planetary Scien

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show abstract

“…For measurement and data analysis, a modified Geoquant program (Siemens) based on international rock standards and internal standards was used. For details, see Schmitt et al (2004). The detection limits for major elements are listed in Table 2.…”

Section: Geochemical Analyses Analytical Methodsmentioning

confidence: 99%

Differentiation and emplacement of the Worthington Offset Dike of the Sudbury impact structure, Ontario

Hecht

Wittek

Riller

et al. 2008

Meteorit & Planetary Scien

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Abstract-The Offset Dikes of the 1.85 Ga Sudbury Igneous Complex (SIC) constitute a key topic in understanding the chemical evolution of the impact melt, its mineralization, and the interplay between melt migration and impact-induced deformation. The origin of the melt rocks in Offset Dikes as well as mode and timing of their emplacement are still a matter of debate. Like many other offset dikes, the Worthington is composed of an early emplaced texturally rather homogeneous quartz-diorite (QD) phase at the dike margin, and an inclusion-and sulfide-rich quartz-diorite (IQD) phase emplaced later and mostly in the centre of the dike. The chemical heterogeneity within and between QD and IQD is mainly attributed to variable assimilation of host rocks at the base of the SIC, prior to emplacement of the melt into the dike. Petrological data suggest that the parental magma of the Worthington Dike mainly developed during the pre-liquidus temperature interval of the thermal evolution of the impact melt sheet (>1200 °C). Based on thermal models of the cooling history of the SIC, the two-stage emplacement of the Worthington Dike occurred likely thousands to about ten thousand years after impact. Structural analysis indicates that an alignment of minerals and host rock fragments within the Worthington Dike was caused by ductile deformation under greenschist-facies metamorphic conditions rather than flow during melt emplacement. It is concluded that the Worthington Offset Dike resulted from crater floor fracturing, possibly driven by late-stage isostatic readjustment of crust underlying the impact structure.

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Estimation of hydraulic permeability considering the micro morphology of rocks of the borehole YAXCOPOIL-1 (Impact crater Chicxulub, Mexico)

Mayr

Burkhardt

Popov

et al. 2007

Int J Earth Sci (Geol Rundsch)

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Internal surface, formation factor, Nuclear Magnetic Resonance (NMR)-T2 relaxation times and pore radius distributions were measured on representative core samples for the estimation of hydraulic permeability. Permeability is estimated using various versions of the classic Kozeny-Carman-equation (K-C) and a further development of K-C, the fractal PaRiS-model, taking into account the internal surface. In addition to grain and pore size distribution, directly connected to permeability, internal surface reflects the internal structure (''micro morphology''). Lithologies could be grouped with respect to differences in internal surface. Most melt rich impact breccia lithologies exhibit large internal surfaces, while Tertiary post-impact sediments and Cretaceous lithologies in displaced megablocks display smaller internal surfaces. Investigations with scanning electron microscopy confirm the correlation between internal surface and micro morphology. In addition to different versions of K-C, estimations by means of NMR, pore radius distributions and some gas permeability measurements serve for cross-checking and calibration. In general, the different estimations from the independent methods and the measurements are in satisfactory accordance.For Tertiary limestones and Suevites bulk with very high porosities (up to 35%) permeabilites between 10 -14 and 10 -16 m 2 are found, whereas in lower Suevite, Cretaceous anhydrites and dolomites, bulk permeabilites are between 10 -15 and 10 -23 m 2 .

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Geochemistry of drill core samples from Yaxcopoil‐1, Chicxulub impact crater, Mexico

Cited by 34 publications

References 42 publications

Impact‐related dike breccia lithologies in the ICDP drill core Yaxcopoil‐1, Chicxulub impact structure, Mexico

Impact‐related dike breccia lithologies in the ICDP drill core Yaxcopoil‐1, Chicxulub impact structure, Mexico

Differentiation and emplacement of the Worthington Offset Dike of the Sudbury impact structure, Ontario

Estimation of hydraulic permeability considering the micro morphology of rocks of the borehole YAXCOPOIL-1 (Impact crater Chicxulub, Mexico)

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