| Full text | |
| Author(s): |
Bin Hassan, Muhammad
[1]
;
Rodelli, Daniel
[1]
;
Benites, Mariana
[1]
;
Abreu, Fernanda
[2]
;
Murton, Bramley
[3]
;
Jovane, Luigi
[1]
Total Authors: 6
|
| Affiliation: | [1] Univ Sao Paulo, Inst Oceanog, Sao Paulo - Brazil
[2] Univ Fed Rio de Janeiro, Inst Microbiol Paulo de Goes, Rio De Janeiro - Brazil
[3] Natl Oceanog Ctr, Southampton, Hants - England
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | ENVIRONMENTAL MICROBIOLOGY REPORTS; v. 12, n. 3, p. 288-295, JUN 2020. |
| Web of Science Citations: | 0 |
| Abstract | |
Transmission electron microscopy (TEM) and rock magnetic study of ferromanganese nodule sample JC120-104B collected from Clarion-Clipperton zone (CCZ) in the eastern Pacific Ocean indicate the presence of biogenic magnetite (magnetofossils). First-order reversal curves (FORCs) and decomposition of isothermal remanent magnetization (IRM) curves were used as the main tool for the characterization of magnetic properties of the bulk magnetic minerals present in the sample. TEM was performed for the direct identification of biogenic magnetic minerals (magnetofossils). The nodule sample has distinctive alternating Mn and Fe-rich layers per micro-X-ray fluorescence data. While diagenetic precipitation of Mn is known for the less oxygenated environment, the presence of biogenic magnetite is also common in the environments where the supply of oxygen is limited. Moreover, the increase in magnetic properties is consistent with the increase in Mn-content, which is related to favourable conditions for Mn precipitation as well as magnetite biomineralization in oxic-suboxic transition zone. Investigations on magnetofossil fingerprints lead to a better understanding of paleoenvironmental conditions involved in the formation and growth of deep-sea ferromanganese nodules. (AU) | |
| FAPESP's process: | 17/04821-0 - Magnetostratigraphic analysis of ferromanganese deposits |
| Grantee: | Muhammad Bin Hassan |
| Support Opportunities: | Scholarships in Brazil - Doctorate (Direct) |
| FAPESP's process: | 18/17061-6 - Relationship between environment and magnetotactic bacteria |
| Grantee: | Luigi Jovane |
| Support Opportunities: | Research Program on Global Climate Change - Regular Grants |
| FAPESP's process: | 11/22018-3 - Primary productivity in oceans studying magnetotactic bacteria in sediments |
| Grantee: | Luigi Jovane |
| Support Opportunities: | Research Program on Global Climate Change - Young Investigators |
| FAPESP's process: | 14/50820-7 - Marine ferromanganese deposits: a major resource of E-tech elements |
| Grantee: | Frederico Pereira Brandini |
| Support Opportunities: | Research Projects - Thematic Grants |