Evidence for shock‐induced anhydrite recrystallization and decomposition at the UNAM‐7 drill core from the Chicxulub impact structure

2019 ◽  
Vol 54 (10) ◽  
pp. 2334-2356
Author(s):  
T. Salge ◽  
H. Stosnach ◽  
G. Rosatelli ◽  
L. Hecht ◽  
W. U. Reimold
Keyword(s):  
Drill Core ◽  
Impact Structure ◽  
Chicxulub Impact

scholarly journals Major and trace element compositions of melt particles and associated phases from the Yaxcopoil-1 drill core, Chicxulub impact structure, Mexico

2006 ◽  
Vol 41 (9) ◽  
pp. 1361-1379 ◽  
Author(s):  
Martin G. TUCHSCHERER ◽  
W. Uwe REIMOLD ◽  
Roger L. GIBSON ◽  
Deon de BRUIN ◽  
Andreas SPÄTH
Keyword(s):  
Trace Element ◽  
Drill Core ◽  
Impact Structure ◽  
Chicxulub Impact

scholarly journals Chicxulub impact structure, IODP‐ICDP Expedition 364 drill core: Geochemistry of the granite basement

2021 ◽  
Vol 56 (7) ◽  
pp. 1243-1273
Author(s):  
Jean‐Guillaume Feignon ◽  
Sietze J. de Graaff ◽  
Ludovic Ferrière ◽  
Pim Kaskes ◽  
Thomas Déhais ◽  
...  
Keyword(s):  
Drill Core ◽  
Impact Structure ◽  
Granite Basement ◽  
Chicxulub Impact

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

2004 ◽  
Vol 39 (6) ◽  
pp. 931-954 ◽  
Author(s):  
A. Wittmann ◽  
T. Kenkmann ◽  
R. T. Schmitt ◽  
L. Hecht ◽  
D. Stöffler
Keyword(s):  
Drill Core ◽  
Impact Structure ◽  
Chicxulub Impact

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

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 The Mesoproterozoic Stac Fada Member, NW Scotland: an impact origin confirmed but refined

2020 ◽  
Vol 178 (1) ◽  
pp. jgs2020-056
Author(s):  
G. R. Osinski ◽  
L. Ferrière ◽  
P. J. A. Hill ◽  
A. R. Prave ◽  
L. J. Preston ◽  
...  
Keyword(s):  
Volcanic Eruptions ◽  
High Energy ◽  
Impact Structure ◽  
Gravity Flows ◽  
Impact Ejecta ◽  
Ejecta Blanket ◽  
Chicxulub Impact ◽  
Melted Material ◽  
Impact Origin ◽  
Primary Impact

The origin of the Stac Fada Member has been debated for decades with several early hypotheses being proposed, but all invoking some connection to volcanic activity. In 2008, the discovery of shocked quartz led to the hypothesis that the Stac Fada Member represents part the continuous ejecta blanket of a meteorite impact crater, the location of which was, and remains, unknown. In this paper, we confirm the presence of shock-metamorphosed and -melted material in the Stac Fada Member; however, we also show that its properties are unlike any other confirmed and well documented proximal impact ejecta deposits on Earth. Instead, the properties of the Stac Fada Member are most similar to the Onaping Formation of the Sudbury impact structure (Canada) and impact melt-bearing breccias from the Chicxulub impact structure (Mexico). We thus propose that, like the Sudbury and Chicxulub deposits, Melt Fuel Coolant Interactions – akin to what occur during phreatomagmatic volcanic eruptions – played a fundamental role in the origin of the Stac Fada Member. We conclude that these rocks are not primary impact ejecta but instead were deposited beyond the extent of the continuous ejecta blanket as high-energy ground-hugging sediment gravity flows.

Sign in / Sign up

Export Citation Format

Share Document