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. 2023 Aug 12;13:13128. doi: 10.1038/s41598-023-40334-y

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© The Author(s) 2023

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Petrographic observations of the Second Member, Qixia Formation and Wulong section. (a) Bioclastic limestone (L1), moldic porosity (MO) and intraparticle porosity are filled with dolomite cement (Cd). The white dotted line represents Phase-I fracture (FR-1) filled with CC and alizarin red staining (Sp-5B, C9). (b) Fine dolomite (D1) is composed of anhedral and subhedral crystals with residual particle structure; intercrystal porosity (BC) developed and porosity was 8% (Sp-06, C9). (c) Medium dolomite (D2), obvious brecciation. The white dotted line represents Phase-II fracture (FR-2) filled with Py, Fl and CC (Sp-5A, C7). (d) The blue dotted line represents FR-1 and the white dotted line represents FR-2. The yellow dotted line represents Phase-III fracture (FR-3) which cuts across FR-2, Cd2 and CC while FR-2 cuts FR-1 (Sp-5A, C7). (e) Medium to coarse dolomite (D2). The white dotted line represents fractured plane light (Sp-07, C9). (f) Figure e displays dull-red luminescence under CL. The white dotted line represents the fracture (Sp-07, C9). (g) Fine dolomite (D1). The white dotted line represents the fracture plane light (Sp-07, C9). (h) Figure g displays the dull luminescence under CL. The white dotted line represents the fracture (Sp-07, C9).