Petrophysics of Chicxulub Impact Crater's Peak Ring

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IODP-ICDP Expedition 364 Sci Party , Le Ber , E , Loggia , D , Denchik , N , Lofi , J , Kring , D A , Sardini , P , Siitari-Kauppi , M , Pezard , P & Olivier , G 2022 , ' Petrophysics of Chicxulub Impact Crater's Peak Ring ' , Journal of Geophysical Research : Solid Earth , vol. 127 , no. 5 , e2021JB023801 .

Title: Petrophysics of Chicxulub Impact Crater's Peak Ring
Author: IODP-ICDP Expedition 364 Sci Party; Le Ber, E.; Loggia, D.; Denchik, N.; Lofi, J.; Kring, D. A.; Sardini, P.; Siitari-Kauppi, M.; Pezard, P.; Olivier, G.
Contributor organization: Department of Chemistry
Geological disposal of spent nuclear fuel
Doctoral Programme in Chemistry and Molecular Sciences
Date: 2022-05
Language: eng
Number of pages: 24
Belongs to series: Journal of Geophysical Research : Solid Earth
ISSN: 2169-9313
Abstract: A new set of physical property measurements was undertaken on 29 peak-ring samples from the IODP-ICDP Expedition 364. Among the studied lithologies, the dominant one recovered in the peak ring consists of shocked granitoid rocks (19 samples). Porosity measurements with two independent methods (triple weight and C-14-PMMA porosity mapping) concur and bring new observations on the intensity and distribution of fracturing and porosity in these shocked target rocks. Characterization of the porous network is taken a step further with two other independent methods (electrical and permeability measurements). Electrical properties such as the cementation exponent (1.59 m < 1.87) and the formation factor (21 F < 103) do not compare with other granites from the published literature; they point at a type of porosity closer to clastic sedimentary rocks than to crystalline rocks. Permeabilities of the granitoid rocks range from 0.1 to 7.1 mD under an effective pressure of similar to 10 MPa. Unlike other fresh to deformed and altered granitoid rocks from the literature compared in this study, this permeability appears to be relatively insensitive to increasing stress (up to similar to 40 MPa), with implications for the nature of the porous network, again, behaving more like cemented clastic rocks than fractured crystalline rocks. Other analyzed lithologies include suevite and impact melt rocks. Relatively low permeability (10(-3) mD) measured in melt-rich facies suggest that, at the matrix scale, these lithologies cutting through more permeable peak-ring granitoid rocks may have been a barrier to fluid flow, with implications for hydrothermal systems.
Subject: petrophysics
impact crater
shocked granite
116 Chemical sciences
Peer reviewed: Yes
Rights: cc_by_nc
Usage restriction: openAccess
Self-archived version: publishedVersion

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