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A honeycomb seafloor morphology in carbonate sediment of the Carnegie Ridge (offshore Ecuador); formation and potential geodynamic significance

F. Michaud, J. Y. Collot, G. Ratzov, J. N. Proust, A. Dano, J. F. Lebrun, M. J. Hernandez, G. Loayza, A. Khaoulani, Y. Stoll, H. Pouderoux and L. De Min
A honeycomb seafloor morphology in carbonate sediment of the Carnegie Ridge (offshore Ecuador); formation and potential geodynamic significance
Geology (Boulder) (November 2018) 46 (11): 979-982

Abstract

Based on swath bathymetry, two-dimensional, high-resolution seismic reflection profiles, and Ocean Drilling Program/Deep Sea Drilling Project (ODP/DSDP) data, we describe a seafloor honeycomb pattern and propose a model for its formation in Pliocene-Miocene carbonate deposited on the uneven oceanic basement of the Carnegie Ridge (offshore Ecuador). Hydrothermal fluids derived from the basement aquifer fractured and dissolved carbonate sediment, creating seafloor pits above basements highs. Fluids expelled along polygonal faults may have assisted the nucleation of seafloor depressions. At the Pliocene-Pleistocene boundary, strong bottom currents scoured previously damaged sediments, enlarging the initial depressions and producing the seafloor honeycomb pattern. This regional erosive episode was contemporaneous with the final closing of the Isthmus of Panama and the clogging of the Ecuador Trench by the subduction of the Carnegie Ridge, so that the honeycomb pattern may be viewed as a regional marker of these two geodynamic events.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 46
Serial Issue: 11
Title: A honeycomb seafloor morphology in carbonate sediment of the Carnegie Ridge (offshore Ecuador); formation and potential geodynamic significance
Affiliation: Universite Cote d'Azur, Institut de Recherche pour le Developpement, Valbonne, France
Pages: 979-982
Published: 201811
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 22
Accession Number: 2018-091061
Categories: Solid-earth geophysicsApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2018392
Illustration Description: illus. incl. sects., geol. sketch map
N06°37'24" - N06°37'24", W85°14'12" - W85°14'12"
N07°50'60" - N07°50'60", W83°35'60" - W83°35'60"
S01°45'42" - S01°45'42", W85°54'12" - W85°54'12"
Secondary Affiliation: Universtie de Rennes, FRA, FranceUniversite des Antilles et de la Guyane, GLP, GuadeloupeEscuela Superior Politecnica del Litoral, ECU, Ecuador
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201849
Program Name: ODPOcean Drilling Program
Program Name: DSDPDeep Sea Drilling Project
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