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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The Alpha Crucis Carbonate Ridge (ACCR): Discovery of a giant ring-shaped carbonate complex on the SW Atlantic margin

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Author(s):
Maly, Mascimiliano [1] ; Schattner, Uri [2] ; Jose Lobo, Francisco [3] ; Soares Dias, Rodolfo Jasao [1] ; Ramos, Raissa Basti [1] ; Couto, Daniel de Matos [1] ; Gomes Sumida, Paulo Yukio [1] ; de Mahiques, Michel Michaelovitch [1, 4]
Total Authors: 8
Affiliation:
[1] Univ Sao Paulo, Oceanog Inst, Sao Paulo, SP - Brazil
[2] Univ Haifa, Leon H Charney Sch Marine Sci, Dr Moses Strauss Dept Marine Geosci, Haifa - Israel
[3] Univ Granada, CSIC, Inst Andaluz Ciencias Tierra, Armilla - Spain
[4] Univ Sao Paulo, Inst Energy & Environm, Sao Paulo, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: SCIENTIFIC REPORTS; v. 9, DEC 10 2019.
Web of Science Citations: 0
Abstract

Recently acquired bathymetric and high-resolution seismic data from the upper slope of Santos Basin, southern Brazilian margin, reveal a major geomorphological feature in the SW Atlantic that is interpreted as a carbonate ridge - the Alpha Crucis Carbonate Ridge (ACCR). The ACCR is the first megastructure of this type described on the SW Atlantic margin. The -17 x 11-km-wide ring-shaped ACCR features tens of >100-m-high steep-sided carbonate mounds protruding from the surrounding seabed and flanked by elongated depressions. Comet-like marks downstream of the mound structures indicate that the area is presently influenced by the northward flow of the Intermediate Western Boundary Current (IWBC), a branch of the Subtropical Gyre that transports Antarctic Intermediate Water. Abundant carbonate sands and gravels cover the mounds and are overlain by a biologically significant community of living and dead ramified corals and associated invertebrates. The IWBC acts as a hydrodynamic factor that is responsible for both shaping the bottom and transporting coral larvae. We contend that the ACCR was formed by upward fluid flow along active sub-surface faults and fractures that formed by lateral extension generated by the ascending movement of salt diapirs at depth. The ACCR provides an important modern and accessible analogue for a seabed carbonate build-up related to sub-surface hydrocarbon systems. (AU)

FAPESP's process: 15/17763-2 - Mudbelts from the South and Southeast Brazil: implications about the anthropogenic influence on the marine environment
Grantee:Márcia Caruso Bícego
Support type: Research Projects - Thematic Grants
FAPESP's process: 16/22194-0 - Anomalous bottom features on the upper slope off Southern Brazil
Grantee:Michel Michaelovitch de Mahiques
Support type: Regular Research Grants
FAPESP's process: 17/50191-8 - Dymamics of salt dome exhumation on the ocean floor, focusing on Santos basin offshore Brazil
Grantee:Michel Michaelovitch de Mahiques
Support type: Regular Research Grants
FAPESP's process: 14/08266-2 - Continental slope morphological features on the SE Brazilian Margin: active tectonics versus modern oceanographic conditions
Grantee:Michel Michaelovitch de Mahiques
Support type: Regular Research Grants