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Abstract
Impact events that create complex craters excavate mid- to lower-crustal rocks, offering a unique perspective on the interior composition and internal dynamics of planetary bodies. On the Yucatán Peninsula, Mexico, the surface geology mainly consists of ~3 km thick sedimentary rocks, with a lack of exposure of crystalline basement in many areas. Consequently, current understanding of the Yucatán subsurface is largely based on impact ejecta and drill cores recovered from the 180–200-km-diameter Chicxulub impact structure. In this study, we present the first apatite and titanite UPb ages for pre-impact dacitic, doleritic, and felsitic magmatic dikes preserved in Chicxulub's peak ring sampled during the 2016 IODP-ICDP Expedition 364. Dating yielded two age groups, with Carboniferous-aged dacites (327–318 Ma) and a felsite (342 ± 4 Ma) overlapping in age with most of the granitoid basement sampled in the Expedition 364 drill core, as well as Jurassic dolerites (168–159 Ma) and a felsite (152 ± 11 Ma) that represent the first in situ sampling of Jurassic-age magmatic intrusions for the Yucatán Peninsula. Further investigation of the Nd, Sr, and Hf isotopic compositions of these pre-impact lithologies and impact melt rocks from the peak ring structure suggest that dolerites generally contributed up to ~10 vol% of the Chicxulub impact melt rock sampled in the peak ring. This percentage implies that the dolerites comprised a large part of the Yucatán subsurface by volume, representing a hitherto unsampled pervasive Jurassic magmatic phase. We interpret this magmatic phase to be related to the opening of the Gulf of Mexico, representing the first physical sampling of lithologies associated with the southern extension of the opening of the Gulf of Mexico and likely constraining its onset to the Late Middle Jurassic.
Original language | English |
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Article number | 106953 |
Pages (from-to) | 1-11 |
Number of pages | 11 |
Journal | Lithos |
Volume | 436-437 |
DOIs | |
Publication status | Published - Jan 2023 |
Bibliographical note
Funding Information:We thank Wendy Debouge, Sabrina Cauchies and Jeroen de Jong (ULB); Monika Horschinegg and Wencke Wegner (University of Vienna); and Phil Orlandini and Lisa Stockli (UT) for their assistance with sample preparation and analytical procedures. The VUB team is supported by FWO; project G0A6517N and BELSPO; PK is an FWO Ph.D. fellow (project 11E6621N). PC thanks the VUB Strategic Program for support. VD acknowledges the ERC Starting Grant “ISo-SyC” and Fund for Scientific Research (FRS-FNRS), for funding. VD, NM, PC and SG thank the Excellence of Science project “ET-HoME” for support. Partial funding was provided by the University of Vienna doctoral school IK-1045. This research was supported by the U.S. Science Support Program and National Science Foundation grant OCE-1737351. DFS acknowledges support from the University of Texas Chevron Gulf Centennial Professorship. SPSG was supported by NASA 19-HW19_2-0055. Greg Shellnutt is thanked for editorial handling, and we thank John Spray and Martin Schmieder for their constructive feedback on the manuscript. This research used samples provided by the International Ocean Discovery Program. This is University of Texas Institute for Geophysics Contribution #3886 and Center for Planetary Systems Habitability Contribution #0060.
Funding Information:
We thank Wendy Debouge, Sabrina Cauchies and Jeroen de Jong (ULB); Monika Horschinegg and Wencke Wegner (University of Vienna); and Phil Orlandini and Lisa Stockli (UT) for their assistance with sample preparation and analytical procedures. The VUB team is supported by FWO ; project G0A6517N and BELSPO ; PK is an FWO Ph.D. fellow (project 11E6621N ). PC thanks the VUB Strategic Program for support. VD acknowledges the ERC Starting Grant “ISo-SyC” and Fund for Scientific Research (FRS-FNRS) , for funding. VD, NM, PC and SG thank the Excellence of Science project “ET-HoME” for support. Partial funding was provided by the University of Vienna doctoral school IK-1045 . This research was supported by the U.S. Science Support Program and National Science Foundation grant OCE-1737351 . DFS acknowledges support from the University of Texas Chevron Gulf Centennial Professorship . SPSG was supported by NASA 19-HW19_2-0055 . Greg Shellnutt is thanked for editorial handling, and we thank John Spray and Martin Schmieder for their constructive feedback on the manuscript. This research used samples provided by the International Ocean Discovery Program. This is University of Texas Institute for Geophysics Contribution #3886 and Center for Planetary Systems Habitability Contribution #0060 .
Publisher Copyright:
© 2022 Elsevier B.V.
Copyright:
Copyright 2022 Elsevier B.V., All rights reserved.
Keywords
- Chicxulub impact structure
- Gulf of Mexico opening
- Impact Melt Rock
- Jurassic aged pre-impact magmatic dikes
- Geochronology
- Petrography
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OZRSRF33: Planetary archives to study Earth’s origin and continuous evolution - SRF mandate
1/11/19 → 31/10/24
Project: Fundamental
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SRP2: Strategic Research Programme: Tracing and Modelling of Past & Present Global Changes
Claeys, P., Elskens, M., Huybrechts, P., Gao, Y., Kervyn De Meerendre, M., Claeys, P., Baeyens, W. & Dehairs, F.
1/11/12 → 31/10/24
Project: Fundamental