scholarly journals Supplemental Material: New insights into the formation and emplacement of impact melt rocks within the Chicxulub impact structure, following the 2016 IODP-ICDP Expedition 364

2021 ◽  
Author(s):  
Sietze J. de Graaff ◽  
et al.
Keyword(s):  
Reference Materials ◽  
Geochemical Data ◽  
Impact Structure ◽  
Impact Melt ◽  
Chicxulub Impact

Appendix S1, containing all geochemical data and specific core depths of all samples and geochemical results for geologic reference materials presented in the article. Figures S1–S3, containing thinsection photographs of representative pre-impact lithologies.

scholarly journals Supplemental Material: New insights into the formation and emplacement of impact melt rocks within the Chicxulub impact structure, following the 2016 IODP-ICDP Expedition 364

2021 ◽  
Author(s):  
Sietze J. de Graaff ◽  
et al.
Keyword(s):  
Reference Materials ◽  
Geochemical Data ◽  
Impact Structure ◽  
Impact Melt ◽  
Chicxulub Impact

Appendix S1, containing all geochemical data and specific core depths of all samples and geochemical results for geologic reference materials presented in the article. Figures S1–S3, containing thinsection photographs of representative pre-impact lithologies.

scholarly journals Supplemental Material: New insights into the formation and emplacement of impact melt rocks within the Chicxulub impact structure, following the 2016 IODP-ICDP Expedition 364

2021 ◽  
Author(s):  
Sietze J. de Graaff ◽  
et al.
Keyword(s):  
Reference Materials ◽  
Geochemical Data ◽  
Impact Structure ◽  
Impact Melt ◽  
Chicxulub Impact

Appendix S1, containing all geochemical data and specific core depths of all samples and geochemical results for geologic reference materials presented in the article. Figures S1–S3, containing thinsection photographs of representative pre-impact lithologies.

Supplemental Material: New insights into the formation and emplacement of impact melt rocks within the Chicxulub impact structure, following the 2016 IODP-ICDP Expedition 364

2021 ◽  
Author(s):  
Sietze J. de Graaff ◽  
et al.
Keyword(s):  
Reference Materials ◽  
Geochemical Data ◽  
Impact Structure ◽  
Impact Melt ◽  
Chicxulub Impact

Appendix S1, containing all geochemical data and specific core depths of all samples and geochemical results for geologic reference materials presented in the article. Figures S1–S3, containing thinsection photographs of representative pre-impact lithologies.

scholarly journals Ocean resurge-induced impact melt dynamics on the peak-ring of the Chicxulub impact structure, Mexico

2021 ◽  
Author(s):  
Felix M. Schulte ◽  
◽  
Axel Wittmann ◽  
Stefan Jung ◽  
Joanna V. Morgan ◽  
...  
Keyword(s):  
Impact Structure ◽  
Physical Processes ◽  
Hydrothermal Conditions ◽  
Chemical Examination ◽  
Impact Melt ◽  
Target Rock ◽  
Single Process ◽  
Chicxulub Impact ◽  
The Impact

AbstractCore from Hole M0077 from IODP/ICDP Expedition 364 provides unprecedented evidence for the physical processes in effect during the interaction of impact melt with rock-debris-laden seawater, following a large meteorite impact into waters of the Yucatán shelf. Evidence for this interaction is based on petrographic, microstructural and chemical examination of the 46.37-m-thick impact melt rock sequence, which overlies shocked granitoid target rock of the peak ring of the Chicxulub impact structure. The melt rock sequence consists of two visually distinct phases, one is black and the other is green in colour. The black phase is aphanitic and trachyandesitic in composition and similar to melt rock from other sites within the impact structure. The green phase consists chiefly of clay minerals and sparitic calcite, which likely formed from a solidified water–rock debris mixture under hydrothermal conditions. We suggest that the layering and internal structure of the melt rock sequence resulted from a single process, i.e., violent contact of initially superheated silicate impact melt with the ocean resurge-induced water–rock mixture overriding the impact melt. Differences in density, temperature, viscosity, and velocity of this mixture and impact melt triggered Kelvin–Helmholtz and Rayleigh–Taylor instabilities at their phase boundary. As a consequence, shearing at the boundary perturbed and, thus, mingled both immiscible phases, and was accompanied by phreatomagmatic processes. These processes led to the brecciation at the top of the impact melt rock sequence. Quenching of this breccia by the seawater prevented reworking of the solidified breccia layers upon subsequent deposition of suevite. Solid-state deformation, notably in the uppermost brecciated impact melt rock layers, attests to long-term gravitational settling of the peak ring.

scholarly journals New insights into the formation and emplacement of impact melt rocks within the Chicxulub impact structure, following the 2016 IODP-ICDP Expedition 364

2021 ◽  
Author(s):  
Sietze J. de Graaff ◽  
Pim Kaskes ◽  
Thomas Déhais ◽  
Steven Goderis ◽  
Vinciane Debaille ◽  
...  
Keyword(s):  
Crystalline Basement ◽  
Impact Structure ◽  
Rock Unit ◽  
Geochemical Composition ◽  
Geochemical Characterization ◽  
Impact Melt ◽  
Bearing Unit ◽  
Chicxulub Impact ◽  
The Impact

This study presents petrographic and geochemical characterization of 46 pre-impact rocks and 32 impactites containing and/or representing impact melt rock from the peak ring of the Chicxulub impact structure (Yucatán, Mexico). The aims were both to investigate the components that potentially contributed to the impact melt (i.e., the pre-impact lithologies) and to better elucidate impact melt rock emplacement at Chicxulub. The impactites presented here are subdivided into two sample groups: the lower impact melt rock−bearing unit, which intrudes the peak ring at different intervals, and the upper impact melt rock unit, which overlies the peak ring. The geochemical characterization of five identified pre-impact lithologies (i.e., granitoid, dolerite, dacite, felsite, and limestone) was able to constrain the bulk geochemical composition of both impactite units. These pre-impact lithologies thus likely represent the main constituent lithologies that were involved in the formation of impact melt rock. In general, the composition of both impactite units can be explained by mixing of the primarily felsic and mafic lithologies, but with varying degrees of carbonate dilution. It is assumed that the two units were initially part of the same impact-produced melt, but discrete processes separated them during crater formation. The lower impact melt rock−bearing unit is interpreted to represent impact melt rock injected into the crystalline basement during the compression/excavation stage of cratering. These impact melt rock layers acted as delamination surfaces within the crystalline basement, accommodating its displacement during peak ring formation. This movement strongly comminuted the impact melt rock layers present in the peak ring structure. The composition of the upper impact melt rock unit was contingent on the entrainment of carbonate components and is interpreted to have stayed at the surface during crater development. Its formation was not finalized until the modification stage, when carbonate material would have reentered the crater.

3D gravity modelling of the Chicxulub impact structure

2001 ◽  
Vol 49 (6) ◽  
pp. 599-609 ◽  
Author(s):  
Jörg Ebbing ◽  
Peter Janle ◽  
Jannis Koulouris ◽  
Bernd Milkereit
Keyword(s):  
Impact Structure ◽  
Gravity Modelling ◽  
3D Gravity ◽  
Chicxulub Impact

Iridium Metal in Chicxulub Impact Melt: Forensic Chemistry on the K-T Smoking Gun

Science ◽  
1996 ◽  
Vol 271 (5255) ◽  
pp. 1573-1576 ◽  
Author(s):  
B. C. Schuraytz ◽  
D. J. Lindstrom ◽  
L. E. Marin ◽  
R. R. Martinez ◽  
D. W. Mittlefehldt ◽  
...  
Keyword(s):  
Forensic Chemistry ◽  
Impact Melt ◽  
Chicxulub Impact
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