| Texto completo | |
| Autor(es): |
Schattner, Uri
[1]
;
Jose Lobo, Francisco
[2]
;
Garcia, Marga
[2]
;
Kanari, Mor
[3]
;
Ramos, Raissa Basti
[4]
;
de Mahiques, Michel Michaelovitch
[4, 5]
Número total de Autores: 6
|
| Afiliação do(s) autor(es): | [1] Univ Haifa, Charney Sch Marine Sci, Dr Mosses Strauss Dept Marine Geosci, Haifa - Israel
[2] Univ Granada, CSIC, Inst Andaluz Ciencias Tierra, Armilla 18100 - Spain
[3] Israel Oceanog & Limnol Res, POB 8030, IL-31080 Haifa - Israel
[4] Univ Sao Paulo, Oceanog Inst, Sao Paulo - Brazil
[5] Univ Sao Paulo, Inst Energy & Environm, Sao Paulo - Brazil
Número total de Afiliações: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | MARINE GEOLOGY; v. 406, p. 98-108, DEC 1 2018. |
| Citações Web of Science: | 2 |
| Resumo | |
Diapir piercement through the ocean floor marks the final stages of a dynamic migration path. Once exhumed, a diapir extrudes from the seafloor, placing an obstacle for the flow of ocean bottom currents. While the hydrodynamic response of the flow has been previously studied, the detailed depositional and weathering modifications involved in the piercement process are less understood. To bridge this gap, we gathered already available multibeam bathymetric data, multichannel 2D seismic reflection profiles and collected new single-channel CHIRP profiles, Acoustic Doppler Current Profiler data and sediment samples across Santos Basin, offshore Brazil. In this region, the processes connecting the uppermost subsurface with the lowermost section of the water column are unknown. Data show three main stages of diapir exhumation: pre-, syn- and post-piercement into the seafloor. Extensional faults crown the pre-exposed diapir, before its piercement through the seafloor. Ocean bottom currents rework the top of the faults to form elongated depressions. The bottom currents tightly detour the diapir during and after its exposure at the seafloor. This interaction forms a drift and moat contourite depositional pattern. Our high-resolution data allow relating these morphologies to seafloor processes and distinguishing them from other reflector geometries related to diapir flank deformation, such as outward dipping of reflections. We further use this geometrical distinction to suggest a key for interpreting the exposure versus burial history of other diapirs worldwide. (AU) | |
| Processo FAPESP: | 14/08266-2 - Feições morfológicas do talude continental da margem Sudeste do Brasil: tectônica ativa versus condições oceanográficas modernas |
| Beneficiário: | Michel Michaelovitch de Mahiques |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 17/50191-8 - Dymamics of salt dome exhumation on the ocean floor, focusing on Santos basin offshore Brazil |
| Beneficiário: | Michel Michaelovitch de Mahiques |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 10/06147-5 - Incremento da capacidade de pesquisa em oceanografia no estado de São Paulo |
| Beneficiário: | Michel Michaelovitch de Mahiques |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Regular |