Tracing Variation in Diagenesis in Concretions: Implications from a Raman Spectroscopic Study
Concretions represent an exceptional mode of fossil preservation. This is attributed to their mineralized outer mantle, which exhibits low permeability and porosity, thereby limiting diagenetic alteration. The present research employs microscopic Raman spectroscopy to assess the thermal maturity of...
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| Published in | Minerals (Basel) Vol. 15; no. 5; p. 502 |
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| Main Authors | , , , |
| Format | Journal Article |
| Language | English |
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| Abstract | Concretions represent an exceptional mode of fossil preservation. This is attributed to their mineralized outer mantle, which exhibits low permeability and porosity, thereby limiting diagenetic alteration. The present research employs microscopic Raman spectroscopy to assess the thermal maturity of kerogen—a highly sensitive organic material—within concretions from northeast Taiwan. Comparative analysis of kerogen from the concretion’s core, rim, and surrounding matrix reveals differential preservation states. The organic matter in the core remains relatively unaltered, whereas the rim exhibits partial graphitization, albeit to a lesser extent than the surrounding matrix. These findings indicate a progressive diagenetic gradient, with the core influenced by the least thermal alteration, followed by the rim, and the surrounding matrix that experiences the highest degree of graphitization. Therefore, the present research underscores the role of concretionary encapsulation in mitigating diagenetic modification and enhancing organic matter preservation. |
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| AbstractList | Concretions represent an exceptional mode of fossil preservation. This is attributed to their mineralized outer mantle, which exhibits low permeability and porosity, thereby limiting diagenetic alteration. The present research employs microscopic Raman spectroscopy to assess the thermal maturity of kerogen—a highly sensitive organic material—within concretions from northeast Taiwan. Comparative analysis of kerogen from the concretion’s core, rim, and surrounding matrix reveals differential preservation states. The organic matter in the core remains relatively unaltered, whereas the rim exhibits partial graphitization, albeit to a lesser extent than the surrounding matrix. These findings indicate a progressive diagenetic gradient, with the core influenced by the least thermal alteration, followed by the rim, and the surrounding matrix that experiences the highest degree of graphitization. Therefore, the present research underscores the role of concretionary encapsulation in mitigating diagenetic modification and enhancing organic matter preservation. |
| Audience | Academic |
| Author | Shimooka, Kazuya Tsuboi, Motohiro Han, Yaxuan Yeh, Meng-Wan |
| Author_xml | – sequence: 1 givenname: Yaxuan orcidid: 0009-0009-5741-6422 surname: Han fullname: Han, Yaxuan – sequence: 2 givenname: Kazuya orcidid: 0009-0006-0095-9184 surname: Shimooka fullname: Shimooka, Kazuya – sequence: 3 givenname: Meng-Wan orcidid: 0000-0001-9449-2867 surname: Yeh fullname: Yeh, Meng-Wan – sequence: 4 givenname: Motohiro orcidid: 0000-0003-0716-7332 surname: Tsuboi fullname: Tsuboi, Motohiro |
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| SubjectTerms | Carbon Comparative analysis Concretions Diagenesis Fossils Graphitization Kerogen Organic matter Permeability Porosity Preservation Quartz Raman spectroscopy Sedimentary structures Sediments Shale oils Spectrum analysis Upper mantle |
| Title | Tracing Variation in Diagenesis in Concretions: Implications from a Raman Spectroscopic Study |
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