Ecosystem changes after Early Cretaceous seawater intrusion into the proto-South Atlantic Ocean
Abstract The early evolution of the South Atlantic Ocean following the Cretaceous break-up of Gondwana is extensively recorded in rift basins along the conjugate margins of Africa and Brazil. For the Brazil side, divergent views of the source and pathway of the initial seawater incursion persist due...
Saved in:
| Main Authors: | , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-01-01
|
| Series: | Communications Earth & Environment |
| Online Access: | https://doi.org/10.1038/s43247-025-02029-2 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832585387452661760 |
|---|---|
| author | Jian Ma Leonardo F. Cury Anelize M. B. Rumbelsperger Heidi L. Albrecht Erwin W. Adams Joachim E. Amthor Xingqian Cui Antoine Crémière Kei Sato Kristin D. Bergmann Roger E. Summons |
| author_facet | Jian Ma Leonardo F. Cury Anelize M. B. Rumbelsperger Heidi L. Albrecht Erwin W. Adams Joachim E. Amthor Xingqian Cui Antoine Crémière Kei Sato Kristin D. Bergmann Roger E. Summons |
| author_sort | Jian Ma |
| collection | DOAJ |
| description | Abstract The early evolution of the South Atlantic Ocean following the Cretaceous break-up of Gondwana is extensively recorded in rift basins along the conjugate margins of Africa and Brazil. For the Brazil side, divergent views of the source and pathway of the initial seawater incursion persist due to a paucity of recognized transitional sequences that document marine transgressive deposits over the continental interior. To address this, we conducted a high-resolution sedimentological and geochemical study through a core in the Campos Basin that encompasses the key lithologic switch from lacustrine carbonate to marine evaporite settings. Steroid lipid biomarkers, derived from pelagophyte marine algae, make a striking appearance in concert with a pronounced negative shift of 87Sr/86Sr ratios and coincident with the appearance of anhydrite. Importantly, the sulfur-sequestered biomarkers reveal a dynamic system where redox-stratified and anoxic conditions were amplified along with a deepening chemocline through the marine transition. |
| format | Article |
| id | doaj-art-d4a5de1ea1134b1f870b2ad3e6f2b4a1 |
| institution | Kabale University |
| issn | 2662-4435 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Communications Earth & Environment |
| spelling | doaj-art-d4a5de1ea1134b1f870b2ad3e6f2b4a12025-01-26T12:54:07ZengNature PortfolioCommunications Earth & Environment2662-44352025-01-016111010.1038/s43247-025-02029-2Ecosystem changes after Early Cretaceous seawater intrusion into the proto-South Atlantic OceanJian Ma0Leonardo F. Cury1Anelize M. B. Rumbelsperger2Heidi L. Albrecht3Erwin W. Adams4Joachim E. Amthor5Xingqian Cui6Antoine Crémière7Kei Sato8Kristin D. Bergmann9Roger E. Summons10Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of TechnologyFederal University of Paraná, LAMIR InstituteFederal University of Paraná, LAMIR InstituteShell Exploration and Production CompanyShell Global Solutions International BVDivision of Earth Sciences and Geography, Rhine-Westphalia Technical University of AachenSchool of Oceanography, Shanghai Jiao Tong UniversityDivision of Geological and Planetary Sciences, California Institute of TechnologySão Paulo UniversityDepartment of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of TechnologyDepartment of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of TechnologyAbstract The early evolution of the South Atlantic Ocean following the Cretaceous break-up of Gondwana is extensively recorded in rift basins along the conjugate margins of Africa and Brazil. For the Brazil side, divergent views of the source and pathway of the initial seawater incursion persist due to a paucity of recognized transitional sequences that document marine transgressive deposits over the continental interior. To address this, we conducted a high-resolution sedimentological and geochemical study through a core in the Campos Basin that encompasses the key lithologic switch from lacustrine carbonate to marine evaporite settings. Steroid lipid biomarkers, derived from pelagophyte marine algae, make a striking appearance in concert with a pronounced negative shift of 87Sr/86Sr ratios and coincident with the appearance of anhydrite. Importantly, the sulfur-sequestered biomarkers reveal a dynamic system where redox-stratified and anoxic conditions were amplified along with a deepening chemocline through the marine transition.https://doi.org/10.1038/s43247-025-02029-2 |
| spellingShingle | Jian Ma Leonardo F. Cury Anelize M. B. Rumbelsperger Heidi L. Albrecht Erwin W. Adams Joachim E. Amthor Xingqian Cui Antoine Crémière Kei Sato Kristin D. Bergmann Roger E. Summons Ecosystem changes after Early Cretaceous seawater intrusion into the proto-South Atlantic Ocean Communications Earth & Environment |
| title | Ecosystem changes after Early Cretaceous seawater intrusion into the proto-South Atlantic Ocean |
| title_full | Ecosystem changes after Early Cretaceous seawater intrusion into the proto-South Atlantic Ocean |
| title_fullStr | Ecosystem changes after Early Cretaceous seawater intrusion into the proto-South Atlantic Ocean |
| title_full_unstemmed | Ecosystem changes after Early Cretaceous seawater intrusion into the proto-South Atlantic Ocean |
| title_short | Ecosystem changes after Early Cretaceous seawater intrusion into the proto-South Atlantic Ocean |
| title_sort | ecosystem changes after early cretaceous seawater intrusion into the proto south atlantic ocean |
| url | https://doi.org/10.1038/s43247-025-02029-2 |
| work_keys_str_mv | AT jianma ecosystemchangesafterearlycretaceousseawaterintrusionintotheprotosouthatlanticocean AT leonardofcury ecosystemchangesafterearlycretaceousseawaterintrusionintotheprotosouthatlanticocean AT anelizembrumbelsperger ecosystemchangesafterearlycretaceousseawaterintrusionintotheprotosouthatlanticocean AT heidilalbrecht ecosystemchangesafterearlycretaceousseawaterintrusionintotheprotosouthatlanticocean AT erwinwadams ecosystemchangesafterearlycretaceousseawaterintrusionintotheprotosouthatlanticocean AT joachimeamthor ecosystemchangesafterearlycretaceousseawaterintrusionintotheprotosouthatlanticocean AT xingqiancui ecosystemchangesafterearlycretaceousseawaterintrusionintotheprotosouthatlanticocean AT antoinecremiere ecosystemchangesafterearlycretaceousseawaterintrusionintotheprotosouthatlanticocean AT keisato ecosystemchangesafterearlycretaceousseawaterintrusionintotheprotosouthatlanticocean AT kristindbergmann ecosystemchangesafterearlycretaceousseawaterintrusionintotheprotosouthatlanticocean AT rogeresummons ecosystemchangesafterearlycretaceousseawaterintrusionintotheprotosouthatlanticocean |