Early formation and taphonomic significance of kaolinite associated with Burgess Shale fossils
The role of minerals in Burgess Shale–type fossilization is controversial, particularly that of the clay mineral kaolinite. Kaolinite may have formed on carcasses or attached to them as they decayed, stabilizing organic matter. Alternatively, kaolinite may have formed during metamorphism, playing no...
| Main Authors: | , , , , |
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| Format: | Journal article |
| Language: | English |
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Geological Society of America
2020
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| _version_ | 1826289597624090624 |
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| author | Anderson, RP Tosca, NJ Saupe, EE Wade, J Briggs, DEG |
| author_facet | Anderson, RP Tosca, NJ Saupe, EE Wade, J Briggs, DEG |
| author_sort | Anderson, RP |
| collection | OXFORD |
| description | The role of minerals in Burgess Shale–type fossilization is controversial, particularly that of the clay mineral kaolinite. Kaolinite may have formed on carcasses or attached to them as they decayed, stabilizing organic matter. Alternatively, kaolinite may have formed during metamorphism, playing no role in the preservation of soft tissues. Evaluating the formation and taphonomic role of kaolinite is difficult, because the mineralogy of Burgess Shale–type fossils is incompletely known. We used in situ selected-area X-ray diffraction to constrain the mineralogy of fossils from the classic Burgess Shale Formation in British Columbia, Canada. Fossils can be distinguished from the matrix that surrounds them by the presence of dolomite, kaolinite, and pyrite. Chlorite may be more abundant in the matrix. The preferential survival of kaolinite in association with fossils provides evidence of early diagenetic clay-organic interactions that protected the clay from metamorphic transformation. Kaolinite likely played a crucial role in fossilization, inhibiting the growth of heterotrophic bacteria and aiding polymerization of soft tissue biomolecules. This may result in biases in soft-tissue preservation to areas and times where kaolinite was prevalent. |
| first_indexed | 2024-03-07T02:31:19Z |
| format | Journal article |
| id | oxford-uuid:a752d014-984c-4a60-af13-5d03ec040210 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T02:31:19Z |
| publishDate | 2020 |
| publisher | Geological Society of America |
| record_format | dspace |
| spelling | oxford-uuid:a752d014-984c-4a60-af13-5d03ec0402102022-03-27T02:53:58ZEarly formation and taphonomic significance of kaolinite associated with Burgess Shale fossilsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:a752d014-984c-4a60-af13-5d03ec040210EnglishSymplectic ElementsGeological Society of America2020Anderson, RPTosca, NJSaupe, EEWade, JBriggs, DEGThe role of minerals in Burgess Shale–type fossilization is controversial, particularly that of the clay mineral kaolinite. Kaolinite may have formed on carcasses or attached to them as they decayed, stabilizing organic matter. Alternatively, kaolinite may have formed during metamorphism, playing no role in the preservation of soft tissues. Evaluating the formation and taphonomic role of kaolinite is difficult, because the mineralogy of Burgess Shale–type fossils is incompletely known. We used in situ selected-area X-ray diffraction to constrain the mineralogy of fossils from the classic Burgess Shale Formation in British Columbia, Canada. Fossils can be distinguished from the matrix that surrounds them by the presence of dolomite, kaolinite, and pyrite. Chlorite may be more abundant in the matrix. The preferential survival of kaolinite in association with fossils provides evidence of early diagenetic clay-organic interactions that protected the clay from metamorphic transformation. Kaolinite likely played a crucial role in fossilization, inhibiting the growth of heterotrophic bacteria and aiding polymerization of soft tissue biomolecules. This may result in biases in soft-tissue preservation to areas and times where kaolinite was prevalent. |
| spellingShingle | Anderson, RP Tosca, NJ Saupe, EE Wade, J Briggs, DEG Early formation and taphonomic significance of kaolinite associated with Burgess Shale fossils |
| title | Early formation and taphonomic significance of kaolinite associated with Burgess Shale fossils |
| title_full | Early formation and taphonomic significance of kaolinite associated with Burgess Shale fossils |
| title_fullStr | Early formation and taphonomic significance of kaolinite associated with Burgess Shale fossils |
| title_full_unstemmed | Early formation and taphonomic significance of kaolinite associated with Burgess Shale fossils |
| title_short | Early formation and taphonomic significance of kaolinite associated with Burgess Shale fossils |
| title_sort | early formation and taphonomic significance of kaolinite associated with burgess shale fossils |
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