Journal
CRETACEOUS RESEARCH
Volume 78, Issue -, Pages 139-148Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cretres.2017.06.004
Keywords
X-ray fluorescence spectrometry; Cretaceous-Tertiary boundary; Geochemistry; Chicxulub impact
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Funding
- ERDF-EU [CSIC10-4E-141, CSIC08-516 4E-001]
- Spanish Ministerio de Economia, Industria y Competitividad (FPI) [BES-2012-052366, BES-2016-076469]
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It is shown that portable X-ray fluorescence (pXRF) is a powerful tool for the identification and geochemical characterization of prospective Cretaceous-Paleogene (K-Pg) boundary sites. Field measurements in two well-known K-Pg boundary sequences, located at Agost and Caravaca, SE Spain, have been performed. A sizable enrichment around the K-Pg horizon of several elements such as K, Ti, Fe, Ni, Cr, Cu, Zn, As or Pb, together with a strong reduction in the Ca content, is found with the pXRF instrument. These observations represent a primary geochemical signature of the K-Pg boundary in distal marine sections such as those of Agost and Caravaca. Also, the intensities of the pXRF peaks correlate well with elemental composition data obtained by inductively coupled plasma-mass spectrometry (ICP-MS) on collected samples. Hence, the pXRF field measurements are shown to provide fast and useful quantitative information about K-Pg boundary sequences. (C) 2017 Elsevier Ltd. All rights reserved.
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