New Insights Into the Formation and Emplacement of Impact Melt Rocks Within the Chicxulub Impact Structure, Following the 2016 Iodp-Icdp Expedition 364

Graaff, Sietze J. de; Kaskes, Pim; Déhais, Thomas; Goderis, Steven; Debaille, Vinciane; Ross, C.; Gulick, Sean S.P.; Feignon, Jean‐Guillaume; Ferrière, L.; Koeberl, Christian; Smit, Jan; Mattielli, Nadine; Claeys, Philippe

doi:10.1130/abs/2021am-369141

Cited by 2 publications

(9 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The upper impact melt rock unit and the lower impact melt rock‐bearing unit both initiated from the same initial impact melt material but their different compositions and facies reflect different emplacement history, as discussed by de Graaff et al. (2021).…”

Section: Geological Contextmentioning

confidence: 91%

“… b After de Graaff et al. (2021; UIM‐upper impact melt rock unit, LIMB‐lower impact melt rock‐bearing unit) and Kaskes et al. (2021).…”

Section: Methodsmentioning

confidence: 99%

“…Solidified impact melt rocks are also found in Unit 4, or the lower impact melt rock‐bearing unit from de Graaff et al. (2021), it consists of a brecciated impact melt rock that is not associated with carbonate dilution. Following peak‐ring lithology classification from Morgan et al.…”

Section: Geological Contextmentioning

confidence: 98%

“…Solidified impact melt rocks in Unit 3, or the upper impact melt rock unit from de Graaff et al. (2021), are a mixture of dark green and black melt rock supporting sub‐cm angular target rocks, melt clasts, and a carbonate signature (de Graaff et al., 2021; Schulte et al., 2021). This study includes two samples (numbers 4 and 5) of that unit.…”

Section: Geological Contextmentioning

confidence: 99%

See 3 more Smart Citations

Petrophysics of Chicxulub Impact Crater's Peak Ring

et al. 2022

View full text Add to dashboard Cite

Physical properties of impact structures are critical in understanding how the target rocks are affected during and after an impact event. They provide observational constraints that can calibrate numerical models used to simulate cratering and postimpact processes. Existing models suggest that large impact events will heat subsurface water in porous permeable crater interiors and generate hydrothermal systems (

show abstract

Section: Geological Contextmentioning

confidence: 91%

“… b After de Graaff et al. (2021; UIM‐upper impact melt rock unit, LIMB‐lower impact melt rock‐bearing unit) and Kaskes et al. (2021).…”

Section: Methodsmentioning

confidence: 99%

Section: Geological Contextmentioning

confidence: 98%

Section: Geological Contextmentioning

confidence: 99%

See 2 more Smart Citations

Petrophysics of Chicxulub Impact Crater's Peak Ring

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Five mbsf through to the base of Unit 3 with the underlying peak‐ring material. However, we designate these as the seismic ‘MELT’ zone and the ‘PR’ zone due to the clear differences between their composition and suggested means of emplacement (de Graaff et al., 2021; Gulick et al., 2019; Kaskes et al., 2019).…”

Section: Introductionmentioning

confidence: 99%

Borehole Seismic Observations From the Chicxulub Impact Drilling: Implications for Seismic Reflectivity and Impact Damage

Nixon

Schmitt

Kofman

et al. 2022

Geochem Geophys Geosyst

View full text Add to dashboard Cite

We conducted a vertical seismic profile (VSP) in the borehole of International Ocean Discovery Program/International Continental Scientific Drilling Program Expedition 364 Site M0077 to better understand the nature of the seismic reflectivity and the in situ seismic properties associated with the Chicxulub impact structure peak ring. Extraction of the up‐going wavefield from the VSP shows that a strong seismic reflection event imaged in seismic reflection data results from discontinuities in the elastic impedance Z (the product of density and wave speed) at the top and bottom of a zone of hydrothermally altered melt‐bearing polymict breccia (suevite) that are characterized by anomalously low Z. Below this strong carbonate/suevite reflection event, the upgoing seismic wavefield is chaotic, indicating high levels of scattering from the suevites and underlying melt rocks and shocked granitoids of the peak ring, in contrast to the clear coherent reflections throughout the overlying Cenozoic sediments. We extract shear wave speeds, which, together with those provided from the complementary sonic log and densities from core scanning, allowed determination of VP/VS and Poisson's ratio v. These values are anomalously high relative to comparable terrestrial lithologies. We also calculate a variety of damage parameters for the disrupted peak ring granitoids. These values may assist in linking seismic observations to shock levels that are necessary to calibrate current impact models and may also be useful in assessing levels of fracturing within major fault zones.

show abstract

New Insights Into the Formation and Emplacement of Impact Melt Rocks Within the Chicxulub Impact Structure, Following the 2016 Iodp-Icdp Expedition 364

Cited by 2 publications

References 0 publications

Petrophysics of Chicxulub Impact Crater's Peak Ring

Petrophysics of Chicxulub Impact Crater's Peak Ring

Borehole Seismic Observations From the Chicxulub Impact Drilling: Implications for Seismic Reflectivity and Impact Damage

Contact Info

Product

Resources

About