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. 2019 Jul 12;9:10125. doi: 10.1038/s41598-019-46253-1

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Results from the borehole Pukaki-1 and the spatial extent of an opal-A/opal-CT reflector. (a) On the seismic panel, bright reflections within Late Eocene and Early Oligocene strata are correlated with diagenetic chert as determined from recovered rock samples (ages calibrated to ref.⁶⁰). The top of cherty limestone clearly defines the opal-A/opal-CT conversion boundary and correlates with a sharp drop in sonic log response. (b) Variation of the depth of the opal-A/opal-CT reflector below the seabed.