A molybdenum isotope perspective on Phanerozoic deoxygenation events
The expansion and contraction of sulphidic depositional conditions in the oceans can be tracked with the isotopic composition of molybdenum in marine sediments. However, molybdenum isotope data are often subject to multiple, conflicting interpretations. Here I present a compilation of molybdenum iso...
| Main Author: | |
|---|---|
| Format: | Journal article |
| Published: |
Nature Publishing Group
2017
|
| _version_ | 1826262789619974144 |
|---|---|
| author | Dickson, A |
| author_facet | Dickson, A |
| author_sort | Dickson, A |
| collection | OXFORD |
| description | The expansion and contraction of sulphidic depositional conditions in the oceans can be tracked with the isotopic composition of molybdenum in marine sediments. However, molybdenum isotope data are often subject to multiple, conflicting interpretations. Here I present a compilation of molybdenum isotope data from three time intervals: the Toarcian Oceanic Anoxic Event about 183 million years ago, Oceanic Anoxic Event 2 about 94 million years ago, and two early Eocene hyperthermal events from 56 to 54 million years ago. A comparison of data from sites located in different hydrographic settings tightly constrains the molybdenum cycle for these intervals, allowing a direct comparison of the expanse of sulphidic conditions in each interval compared to today. Nonetheless, tracing rates of redox change over such rapid climatic events using molybdenum-isotopes remains challenging. Future efforts to achieve this goal might be accomplished by analysing specific mineral phases, using complementary redox-sensitive geochemical techniques, and by linking isotopic observations with Earth System modelling. Such improvements will make it possible to more fully assess the links between ocean deoxygenation, climatic and oceanographic changes, and biotic turnover. |
| first_indexed | 2024-03-06T19:41:39Z |
| format | Journal article |
| id | oxford-uuid:20e31b9f-f242-4484-ad81-07d4f9dc6b44 |
| institution | University of Oxford |
| last_indexed | 2024-03-06T19:41:39Z |
| publishDate | 2017 |
| publisher | Nature Publishing Group |
| record_format | dspace |
| spelling | oxford-uuid:20e31b9f-f242-4484-ad81-07d4f9dc6b442022-03-26T11:30:01ZA molybdenum isotope perspective on Phanerozoic deoxygenation eventsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:20e31b9f-f242-4484-ad81-07d4f9dc6b44Symplectic Elements at OxfordNature Publishing Group2017Dickson, AThe expansion and contraction of sulphidic depositional conditions in the oceans can be tracked with the isotopic composition of molybdenum in marine sediments. However, molybdenum isotope data are often subject to multiple, conflicting interpretations. Here I present a compilation of molybdenum isotope data from three time intervals: the Toarcian Oceanic Anoxic Event about 183 million years ago, Oceanic Anoxic Event 2 about 94 million years ago, and two early Eocene hyperthermal events from 56 to 54 million years ago. A comparison of data from sites located in different hydrographic settings tightly constrains the molybdenum cycle for these intervals, allowing a direct comparison of the expanse of sulphidic conditions in each interval compared to today. Nonetheless, tracing rates of redox change over such rapid climatic events using molybdenum-isotopes remains challenging. Future efforts to achieve this goal might be accomplished by analysing specific mineral phases, using complementary redox-sensitive geochemical techniques, and by linking isotopic observations with Earth System modelling. Such improvements will make it possible to more fully assess the links between ocean deoxygenation, climatic and oceanographic changes, and biotic turnover. |
| spellingShingle | Dickson, A A molybdenum isotope perspective on Phanerozoic deoxygenation events |
| title | A molybdenum isotope perspective on Phanerozoic deoxygenation events |
| title_full | A molybdenum isotope perspective on Phanerozoic deoxygenation events |
| title_fullStr | A molybdenum isotope perspective on Phanerozoic deoxygenation events |
| title_full_unstemmed | A molybdenum isotope perspective on Phanerozoic deoxygenation events |
| title_short | A molybdenum isotope perspective on Phanerozoic deoxygenation events |
| title_sort | molybdenum isotope perspective on phanerozoic deoxygenation events |
| work_keys_str_mv | AT dicksona amolybdenumisotopeperspectiveonphanerozoicdeoxygenationevents AT dicksona molybdenumisotopeperspectiveonphanerozoicdeoxygenationevents |