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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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Late Paleogene sedimentary drifts and opal-A/opal-CT reflector. (a) A lenticular shaped unit between markers ME and TE is identified as a buried plastered drift south of the Bounty Trough. Strong positive amplitude reflections are seen towards the top of the drift in the BT. (b) The opal-A/opal-CT reaction front shows negligible or smaller offset (blue arrow) than the offset of the host Late Eocene unit (cf. ref.⁷⁵). The diagenetic transformation could have post-dated the displacement across the faults, or the displacement rate of the faults was greater than the upward advancement of the diagenetic front. Some faults extending into the Oligocene and Miocene sequence also affected the diagenetic front, probably post-dating diagenetic transformation.