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An emplacement mechanism for the mega-block zone within the Chicxulub crater, (Yucatan, Mexico) based on chemostratigraphy

Joke Belza, Steven Goderis UGent, Eddy Keppens, Frank Vanhaecke UGent and Philippe Claeys (2012) METEORITICS & PLANETARY SCIENCE. 47(3). p.400-413
abstract
To better constrain the emplacement mechanism of the so-called mega-block zone, a structurally complex unit of target rocks within the Chicxulub impact structure, the stratigraphic coherence of this zone is tested using its strontium isotopic composition. Forty-eight samples across the 616 m sequence of deformed Cretaceous rocks in the lower part of the Yaxcopoil-1 core, drilled by ICDP in 2002, were analyzed for their 87Sr/86Sr isotope ratio. The oceanic anoxic event 2 (OAE2 event), located near the base of the core forms the only stratigraphic anchor point. From this point upward to approximately 1050 m depth, the 87Sr/86Sr trend shows small oscillations, between approximately 0.7074 and 0.7073, characteristic of Cenomanian to Santonian values. This is followed by an increase to approximately 0.7075, similar to the one reported in the seawater strontium curve during the Campanian. Scattered Sr isotope ratios are attributed to local diagenetic effects, such as those expected from the possible presence of hot, impact-induced dikes and hydrothermal fluid flow, originating from the thick central melt sheet. The absence of Upper Maastrichtian Sr isotope values may result from the removal of upper target lithologies during the impact cratering process. Based on these results, the displaced Cretaceous sequence in Yax-1 appears to have preserved its stratigraphic coherence. During the modification stage, it probably moved as a whole into the annular basin during collapse of the crater wall, thereby breaking up into discrete units along previously weakened detachment zones. This model is consistent with the emplacement mechanism postulated by Kenkmann et al. (2004).
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
PEAK-RING FORMATION, OCEANIC ANOXIC EVENTS, DRILL CORE YAXCOPOIL-1, CRETACEOUS-PALEOGENE BOUNDARY, IMPACT CRATER, STRONTIUM ISOTOPES, REFERENCE CURVE, ALBION ISLAND, OIL-FIELDS, SEAWATER
journal title
METEORITICS & PLANETARY SCIENCE
Meteorit. Planet. Sci.
volume
47
issue
3
pages
400 - 413
Web of Science type
Article
Web of Science id
000302073300007
JCR category
GEOCHEMISTRY & GEOPHYSICS
JCR impact factor
2.8 (2012)
JCR rank
18/76 (2012)
JCR quartile
1 (2012)
ISSN
1086-9379
DOI
10.1111/j.1945-5100.2012.01345.x
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
2106620
handle
http://hdl.handle.net/1854/LU-2106620
date created
2012-05-15 09:33:34
date last changed
2012-05-15 10:56:41
@article{2106620,
  abstract     = {To better constrain the emplacement mechanism of the so-called mega-block zone, a structurally complex unit of target rocks within the Chicxulub impact structure, the stratigraphic coherence of this zone is tested using its strontium isotopic composition. Forty-eight samples across the 616 m sequence of deformed Cretaceous rocks in the lower part of the Yaxcopoil-1 core, drilled by ICDP in 2002, were analyzed for their 87Sr/86Sr isotope ratio. The oceanic anoxic event 2 (OAE2 event), located near the base of the core forms the only stratigraphic anchor point. From this point upward to approximately 1050 m depth, the 87Sr/86Sr trend shows small oscillations, between approximately 0.7074 and 0.7073, characteristic of Cenomanian to Santonian values. This is followed by an increase to approximately 0.7075, similar to the one reported in the seawater strontium curve during the Campanian. Scattered Sr isotope ratios are attributed to local diagenetic effects, such as those expected from the possible presence of hot, impact-induced dikes and hydrothermal fluid flow, originating from the thick central melt sheet. The absence of Upper Maastrichtian Sr isotope values may result from the removal of upper target lithologies during the impact cratering process. Based on these results, the displaced Cretaceous sequence in Yax-1 appears to have preserved its stratigraphic coherence. During the modification stage, it probably moved as a whole into the annular basin during collapse of the crater wall, thereby breaking up into discrete units along previously weakened detachment zones. This model is consistent with the emplacement mechanism postulated by Kenkmann et al. (2004).},
  author       = {Belza, Joke and Goderis, Steven and Keppens, Eddy and Vanhaecke, Frank and Claeys, Philippe},
  issn         = {1086-9379},
  journal      = {METEORITICS \& PLANETARY SCIENCE},
  keyword      = {PEAK-RING FORMATION,OCEANIC ANOXIC EVENTS,DRILL CORE YAXCOPOIL-1,CRETACEOUS-PALEOGENE BOUNDARY,IMPACT CRATER,STRONTIUM ISOTOPES,REFERENCE CURVE,ALBION ISLAND,OIL-FIELDS,SEAWATER},
  language     = {eng},
  number       = {3},
  pages        = {400--413},
  title        = {An emplacement mechanism for the mega-block zone within the Chicxulub crater, (Yucatan, Mexico) based on chemostratigraphy},
  url          = {http://dx.doi.org/10.1111/j.1945-5100.2012.01345.x},
  volume       = {47},
  year         = {2012},
}

Chicago
Belza, Joke, Steven Goderis, Eddy Keppens, Frank Vanhaecke, and Philippe Claeys. 2012. “An Emplacement Mechanism for the Mega-block Zone Within the Chicxulub Crater, (Yucatan, Mexico) Based on Chemostratigraphy.” Meteoritics & Planetary Science 47 (3): 400–413.
APA
Belza, J., Goderis, S., Keppens, E., Vanhaecke, F., & Claeys, P. (2012). An emplacement mechanism for the mega-block zone within the Chicxulub crater, (Yucatan, Mexico) based on chemostratigraphy. METEORITICS & PLANETARY SCIENCE, 47(3), 400–413.
Vancouver
1.
Belza J, Goderis S, Keppens E, Vanhaecke F, Claeys P. An emplacement mechanism for the mega-block zone within the Chicxulub crater, (Yucatan, Mexico) based on chemostratigraphy. METEORITICS & PLANETARY SCIENCE. 2012;47(3):400–13.
MLA
Belza, Joke, Steven Goderis, Eddy Keppens, et al. “An Emplacement Mechanism for the Mega-block Zone Within the Chicxulub Crater, (Yucatan, Mexico) Based on Chemostratigraphy.” METEORITICS & PLANETARY SCIENCE 47.3 (2012): 400–413. Print.