NDLI: Pockmark asymmetry and seafloor currents in the Santos Basin offshore Brazil

Content Provider	Springer Nature Link
Author	Schattner, U. Lazar, M. Souza, L. A. P. ten Brink, U. Mahiques, M. M.
Copyright Year	2016
Abstract	Pockmarks form by gas/fluid expulsion into the ocean and are preserved under conditions of negligible sedimentation. Ideally, they are circular at the seafloor and symmetrical in profile. Elliptical pockmarks are more enigmatic. They are associated with seafloor currents while asymmetry is connected to sedimentation patterns. This study examines these associations through morphological analysis of new multibeam data collected across the Santos continental slope offshore Brazil in 2011 (353–865 mbsl). Of 984 pockmarks, 78% are both elliptical and asymmetric. Geometric criteria divide the pockmarks into three depth ranges that correlate with a transition between two currents: the Brazil Current transfers Tropical Water and South Atlantic Central Water southwestwards while the Intermediate Western Boundary Current transfers Antarctic Intermediate Water northeastwards. It is suggested that the velocity of seafloor currents and their persistence dictate pockmark ellipticity, orientation and profile asymmetry. Fast currents (>20 cm/s) are capable of maintaining pockmark flank steepness close to the angle of repose. These morphological expressions present direct evidence for an edge effect of the South Atlantic Subtropical Gyre and, in general, provide a correlation between pockmark geometry and seafloor currents that can be applied at other locations worldwide.
Starting Page	457
Ending Page	464
Page Count	8
File Format	PDF
ISSN	02760460
Journal	Geo-Marine Letters
Volume Number	36
Issue Number	6
e-ISSN	14321157
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-09-14
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Geology
Content Type	Text
Resource Type	Article
Subject	Environmental Science Geotechnical Engineering and Engineering Geology Oceanography

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Pockmark asymmetry and seafloor currents in the Santos Basin offshore Brazil

Microbially mediated methane and sulfur cycling in pockmark sediments of the Gdansk Basin, Baltic Sea

Subsurface control on seafloor erosional processes offshore of the Chandeleur Islands, Louisiana

Sedimentary and structural control on pockmark development—evidence from the Nyegga pockmark field, NW European margin

Expelled subsalt fluids form a pockmark field in the eastern Red Sea

Delineating the northern part of the Socotra Basin, offshore Korea, using marine magnetics

ROV study of a giant pockmark on the Gabon continental margin

Electrical properties of seafloor massive sulfides

Active seepage in two contrasting pockmark fields in the Patras and Corinth gulfs, Greece

Pockmark asymmetry and seafloor currents in the Santos Basin offshore Brazil

Similar Documents

Pockmark asymmetry and seafloor currents in the Santos Basin offshore Brazil

Microbially mediated methane and sulfur cycling in pockmark sediments of the Gdansk Basin, Baltic Sea

Subsurface control on seafloor erosional processes offshore of the Chandeleur Islands, Louisiana

Sedimentary and structural control on pockmark development—evidence from the Nyegga pockmark field, NW European margin

Expelled subsalt fluids form a pockmark field in the eastern Red Sea

Delineating the northern part of the Socotra Basin, offshore Korea, using marine magnetics

ROV study of a giant pockmark on the Gabon continental margin

Electrical properties of seafloor massive sulfides

Active seepage in two contrasting pockmark fields in the Patras and Corinth gulfs, Greece

Pockmark asymmetry and seafloor currents in the Santos Basin offshore Brazil