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dc.contributor.authorTimms, Nick
dc.contributor.authorKirkland, Chris
dc.contributor.authorCavosie, Aaron
dc.contributor.authorRae, A.S.P.
dc.contributor.authorRickard, William
dc.contributor.authorEvans, Noreen
dc.contributor.authorErickson, Timmons
dc.contributor.authorWittmann, A.
dc.contributor.authorFerrière, L.
dc.contributor.authorCollins, G.S.
dc.contributor.authorGulick, S.P.S.
dc.date.accessioned2020-12-10T07:30:26Z
dc.date.available2020-12-10T07:30:26Z
dc.date.issued2020
dc.identifier.citationTimms, N.E. and Kirkland, C.L. and Cavosie, A.J. and Rae, A.S.P. and Rickard, W.D.A. and Evans, N.J. and Erickson, T.M. et al. 2020. Shocked titanite records Chicxulub hydrothermal alteration and impact age. Geochimica et Cosmochimica Acta. 281: pp. 12-30.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/82056
dc.identifier.doi10.1016/j.gca.2020.04.031
dc.description.abstract

© 2020 Elsevier Ltd

Hydrothermal activity is a common phenomenon in the wake of impact events, yet identifying and dating impact hydrothermal systems can be challenging. This study provides the first detailed assessment of the effects of shock microstructures and impact-related alteration on the U-Pb systematics and trace elements of titanite (CaTiSiO5), focusing on shocked granite target rocks from the peak ring of the Chicxulub impact structure, Mexico. A > 1 mm long, shock-twinned titanite grain preserves a dense network of irregular microcracks, some of which exploit shock twin interfaces. Secondary microcrystalline anatase and pyrite are heterogeneously distributed along some microcracks. In situ laser ablation multi-collector inductively-coupled plasma mass spectrometry (LA-MC-ICPMS) analysis reveals a mixture of three end-member Pb components. The Pb components are: 1) common Pb, consistent with the Pb isotopic signature of adjacent alkali feldspar; 2) radiogenic Pb accumulated since magmatic crystallization; and 3) a secondary, younger Pb signature due to impact-related complete radiogenic Pb loss. The youngest derived ages define a regression from common Pb that intersects Concordia at 67 ± 4 Ma, in agreement with the established age of 66.04 ± 0.05 Ma for the Chicxulub impact event. Contour maps of LA-MC-ICPMS data reveal that the young ages are spatially restricted to microstructurally-complex domains that correlate with significant depletion in trace elements (REE-Y-Zr-Nb-Mo-Sn-Th) and reduction in magnitude of the Eu/Eu* anomaly. Mapping by time-of-flight secondary ion mass spectrometry (ToF-SIMS) show that patterns of localised element depletion in titanite are spatially related to microcracks, which are enriched in Al. The spatial correlation of ages and trace element abundance is consistent with localised removal of Pb and other trace elements from a pervasive network of fast fluid pathways in fractured domains via a fluid-mediated element transport process associated with the impact event. Here we interpret the 67 ± 4 Ma U-Pb age to represent hydrothermal Pb-loss in the Chicxulub peak ring in the wake of the impact event. These results highlight the potential of our analytical approach using titanite geochronology and geochemistry for dating post-impact hydrothermal activity in impact structures elsewhere.

dc.languageEnglish
dc.publisherPERGAMON-ELSEVIER SCIENCE LTD
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/LE130100053
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/LE150100013
dc.subjectScience & Technology
dc.subjectPhysical Sciences
dc.subjectGeochemistry & Geophysics
dc.subjectTitanite
dc.subjectImpact crater
dc.subjectU-Pb dating
dc.subjectHydrothermal
dc.subjectChicxulub
dc.subjectMicrocrack
dc.subjectU-PB SYSTEMATICS
dc.subjectPEAK-RING FORMATION
dc.subjectRADIATION-DAMAGE
dc.subjectMAYA BLOCK
dc.subjectZIRCON
dc.subjectCRATER
dc.subjectROCKS
dc.subjectGEOCHRONOLOGY
dc.subjectLEAD
dc.subjectYAXCOPOIL-1
dc.titleShocked titanite records Chicxulub hydrothermal alteration and impact age
dc.typeJournal Article
dcterms.source.volume281
dcterms.source.startPage12
dcterms.source.endPage30
dcterms.source.issn0016-7037
dcterms.source.titleGeochimica et Cosmochimica Acta
dc.date.updated2020-12-10T07:30:25Z
curtin.departmentSchool of Earth and Planetary Sciences (EPS)
curtin.departmentJohn de Laeter Centre (JdLC)
curtin.accessStatusFulltext not available
curtin.facultyFaculty of Science and Engineering
curtin.contributor.orcidKirkland, Chris [0000-0003-3367-8961]
curtin.contributor.orcidTimms, Nick [0000-0003-2997-4303]
curtin.contributor.orcidCavosie, Aaron [0000-0001-6819-6810]
curtin.contributor.orcidRickard, William [0000-0002-8118-730X]
curtin.contributor.orcidEvans, Noreen [0000-0002-7615-8328]
curtin.contributor.researcheridKirkland, Chris [S-3305-2016]
curtin.contributor.researcheridTimms, Nick [A-4885-2008]
curtin.contributor.researcheridRickard, William [E-9963-2013]
curtin.contributor.researcheridEvans, Noreen [C-3275-2013]
dcterms.source.eissn1872-9533
curtin.contributor.scopusauthoridKirkland, Chris [14622849000]
curtin.contributor.scopusauthoridTimms, Nick [6602657575]
curtin.contributor.scopusauthoridCavosie, Aaron [7801313029]
curtin.contributor.scopusauthoridRickard, William [35171231700]
curtin.contributor.scopusauthoridEvans, Noreen [7401559218]
curtin.contributor.scopusauthoridErickson, Timmons [55547901500]


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