Academic Journal
Mercury contents and isotope ratios from diverse depositional environments across the Triassic–Jurassic Boundary: Towards a more robust mercury proxy for large igneous province magmatism
| العنوان: | Mercury contents and isotope ratios from diverse depositional environments across the Triassic–Jurassic Boundary: Towards a more robust mercury proxy for large igneous province magmatism |
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| المؤلفون: | Yager, Joyce A., West, A. Joshua, Thibodeau, Alyson M., Corsetti, Frank A., Rigo, Manuel, Berelson, William M., Bottjer, David J., Greene, Sarah E., Ibarra, Yadira, Jadoul, Flavio, Ritterbush, Kathleen A., Rollins, Nick, Rosas, Silvia, Di Stefano, Pietro, Sulca, Debbie, Todaro, Simona, Wynn, Peter, Zimmermann, Laura, Bergquist, Bridget A. |
| المساهمون: | Yager, Joyce A., West, A. Joshua, Thibodeau, Alyson M., Corsetti, Frank A., Rigo, Manuel, Berelson, William M., Bottjer, David J., Greene, Sarah E., Ibarra, Yadira, Jadoul, Flavio, Ritterbush, Kathleen A., Rollins, Nick, Rosas, Silvia, Di Stefano, Pietro, Sulca, Debbie, Todaro, Simona, Wynn, Peter, Zimmermann, Laura, Bergquist, Bridget A. |
| سنة النشر: | 2021 |
| المجموعة: | IRIS Università degli Studi di Palermo |
| مصطلحات موضوعية: | End–Triassic extinction, Mercury isotope, Triassic–Jurassic boundary, Mercury |
| الوصف: | Mercury is gaining prominence as a proxy for large igneous province (LIP) volcanism in the sedimentary record. Despite temporal overlap between some mass extinctions and LIPs, the precise timing of magmatism relative to major ecological and environmental change is difficult to untangle, especially in marine settings. Changes in the relative contents of Hg in sedimentary rocks through time, or ‘Hg anomalies’, can help resolve the timing of LIP activity and marine extinctions. However, major questions remain unanswered about the fidelity of Hg as a proxy for LIP magmatism. In particular, depositional (e.g., redox) and post-depositional (e.g., oxidative weathering) processes can affect Hg preservation in marine sediments. These factors pose challenges for confidently using Hg as a fingerprint of volcanism. Here, we use the Hg anomaly at the Triassic–Jurassic boundary to explore the opportunities and challenges associated with two approaches that may help build a more robust interpretation of the Hg proxy: (1) measurements from sediments from diverse depositional environments, including lithologies with low Hg and organic carbon content, and (2) the simultaneous use of Hg stable isotope ratios. We present and compare Hg records from five geographically disparate Upper Triassic–Lower Jurassic marine sections that represent nearshore, mid-shelf, deep-water, and carbonate platform settings. These sedimentary sections span the emplacement of the Central Atlantic magmatic province (CAMP) and the associated end–Triassic extinction (ETE). Total organic carbon contents, carbonate contents, and Hg contents and stable isotope compositions demonstrate the multiple ways in which different depositional environments impact how Hg anomalies are expressed in ancient marine sedimentary rocks. Although we observe an increase in Hg/TOC during the ETE in each section, the pattern and duration of Hg enrichment differ notably between sections, and the timing is not always coincident with CAMP activity, illustrating how the depositional ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | firstpage:103775; numberofpages:75; journal:EARTH-SCIENCE REVIEWS; http://hdl.handle.net/10447/518179 |
| DOI: | 10.1016/j.earscirev.2021.103775 |
| الاتاحة: | http://hdl.handle.net/10447/518179 https://doi.org/10.1016/j.earscirev.2021.103775 |
| Rights: | info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.431E1E72 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1016/j.earscirev.2021.103775 |
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