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What are the biogeochemical consequences of heuweltjie formation?
This study was to determine whether the basal calcrete layer of heuweltjies derives its nutrients from local or exotic sources and also to estimate relative rates of deposition and an approximate age of the heuweltjie. By calculating deposition rates and by using data from Soderberg and Compton [199...
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| Format: | Thesis |
| Language: | English |
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Department of Biological Sciences
2017
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| _version_ | 1867613643827314688 |
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| access_status_str | Open Access |
| author | Harington, Amy |
| author2 | Midgley, Jeremy J |
| author_browse | Harington, Amy Midgley, Jeremy J |
| author_facet | Midgley, Jeremy J Harington, Amy |
| author_sort | Harington, Amy |
| collection | Thesis |
| description | This study was to determine whether the basal calcrete layer of heuweltjies derives its nutrients from local or exotic sources and also to estimate relative rates of deposition and an approximate age of the heuweltjie. By calculating deposition rates and by using data from Soderberg and Compton [1998] heuweltjies were found to be much older than previous research has indicated ~95 000 years old. ⁸⁷/⁸⁶Sr isotope ratios of on-mound and off-mound soils indicate that the majority of the nutrients are exotically derived. However, it is important to note that there are various different sources which could have contributed to the mound and that it could not be determined what sources had contributed in what proportions. It was determined through a simple mixing model that approximately 90% of the nutrients are derived from marine aerosol. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/25582 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:39:25.088Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2017 |
| publishDateRange | 2017 |
| publishDateSort | 2017 |
| publisher | Department of Biological Sciences |
| publisherStr | Department of Biological Sciences |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/25582 What are the biogeochemical consequences of heuweltjie formation? Harington, Amy Midgley, Jeremy J Botany Ecology This study was to determine whether the basal calcrete layer of heuweltjies derives its nutrients from local or exotic sources and also to estimate relative rates of deposition and an approximate age of the heuweltjie. By calculating deposition rates and by using data from Soderberg and Compton [1998] heuweltjies were found to be much older than previous research has indicated ~95 000 years old. ⁸⁷/⁸⁶Sr isotope ratios of on-mound and off-mound soils indicate that the majority of the nutrients are exotically derived. However, it is important to note that there are various different sources which could have contributed to the mound and that it could not be determined what sources had contributed in what proportions. It was determined through a simple mixing model that approximately 90% of the nutrients are derived from marine aerosol. 2017-10-11T10:58:07Z 2017-10-11T10:58:07Z 2008 2017-02-07T13:49:10Z Bachelor Thesis Honours BSc (Hons) http://hdl.handle.net/11427/25582 eng application/pdf Department of Biological Sciences Faculty of Science University of Cape Town |
| spellingShingle | Botany Ecology Harington, Amy What are the biogeochemical consequences of heuweltjie formation? |
| thesis_degree_str | Bachelor's / Honours |
| title | What are the biogeochemical consequences of heuweltjie formation? |
| title_full | What are the biogeochemical consequences of heuweltjie formation? |
| title_fullStr | What are the biogeochemical consequences of heuweltjie formation? |
| title_full_unstemmed | What are the biogeochemical consequences of heuweltjie formation? |
| title_short | What are the biogeochemical consequences of heuweltjie formation? |
| title_sort | what are the biogeochemical consequences of heuweltjie formation |
| topic | Botany Ecology |
| url | http://hdl.handle.net/11427/25582 |
| work_keys_str_mv | AT haringtonamy whatarethebiogeochemicalconsequencesofheuweltjieformation |