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. 2019 Dec 5;10:5547. doi: 10.1038/s41467-019-12957-1

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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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Fig. 2 — Modelling hydrocarbon-generating reactions within thermal aureoles of igneous sills. a–e 400-m-thick sill emplaced at 3 km; f–j 200-m-thick sill emplaced at 2 km; k–n 50-m-thick sill emplaced at 1 km. a, f, k Temperature profiles immediately before sill intrusion (thick black line) and at times after sill intrusion of 100 years (thinnest line, lightest colour), 1000 years, 10,000 years and 100,000 years (thickest line, strongest colour). All other plots show the same time snapshots using corresponding line thicknesses and colour strengths. b, d, l Reaction progress for labile kerogen maturing to oil. c, h, m Reaction progress for oil cracking to methane. d, i, n Reaction progress for refractory kerogen maturing to methane. e, j, o Reaction progress for vitrinite reflectance. The full suite of calculations was done for sill thicknesses of 50, 100, 200, 300 and 400 m at emplacement depths of 0.5, 1.0, 1.5, 2.0, 2.5, 3.0 and 3.5 km.