EurekaMag.com logo
+ Site Statistics
References:
53,869,633
Abstracts:
29,686,251
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on LinkedInFollow on LinkedIn

+ Translate

Early Devonian Kess-Kess carbonate mud mounds of the eastern Anti-Atlas (Morocco), and their relation to submarine hydrothermal venting



Early Devonian Kess-Kess carbonate mud mounds of the eastern Anti-Atlas (Morocco), and their relation to submarine hydrothermal venting



Journal of Sedimentary Research 68(3): 368-377



Spectacular conical Early Devonian carbonate buildups up to 55 m high that crop out in the eastern Anti-Atlas of southern Morocco are microbially mediated carbonate mud mounds that were surfaced by soft-bottom communities dominated by small tabulate corals. They formed on the Hamar Laghdad elevation, which was created by a submarine volcanic eruption, and were associated with a network of synsedimentary radial and tangential faults that originated by uplift of the intrusive laccolithic body underlying the Kess-Kess Formation. These faults served as conduits for the migration of hydrothermal fluids to the sea floor. Most mounds developed over cross-points of radial and tangential faults. Vents were episodically active until the Famennian, but extensive vent carbonate production occurred only during the Emsian. Preliminary geochemical results document that mud-mound carbonates and calcite cements in neptunian dikes precipitated from brines comprising a mixture of hydrothermal fluids and seawater. In addition, carbon isotope compositions (delta (super 13) C as low as -18 per mil PDB) suggest a contribution from thermogenic methane derived presumably from underlying basaltic intrusives. Aerobic bacterial oxidation of methane is favored as the main process driving carbonate precipitation in, and rapid lithification of, the mounds.

(PDF emailed within 1 workday: $29.90)

Accession: 018783654

Download citation: RISBibTeXText



Related references

The origin of the Early Devonian Kess-Kess mud mounds of the eastern Anti-Atlas (Morocco); evidence for submarine venting of methane-rich fluids. ASF Association des Sedimentologistes Francais 26: 5-6, 1997

Diagenesis of Devonian gas hydrothermal systems of the Kess-Kess mud mounds, eastern Anti-Atlas, Morocco. Schriftenreihe der Deutschen Geologischen Gesellschaft 17: 53, 2002

Hydrothermal origin of Devonian conical mounds (kess-kess) of Hamar Lakhdad Ridge, Anti-Atlas, Morocco. Geology (Boulder) 26(12): 1123-1126, 1998

Hydrothermal original of Devonian conical mounds (kess-kess) of Hamar Lakhdad Ridge, Anti-Atlas, Morocco; discussion and reply. Geology (Boulder) 27(9): 863-864, 1999

Evidences for hydrothermal hydrocarbon circulation related to the diagenesis of Kess-Kess mud mounds (Devonian, Morocco). International Geological Congress, Abstracts = Congres Geologique International, Resumes 32, Part 2: 929, 2004

Kess Kess hydrothermal mounds in Morocco; a unique analog for exploring possible fossil or extant life on Mars. Abstracts of Papers Submitted to the Lunar and Planetary Science Conference 43, 2012

Organic matter remains in the laminated microfabrics of the Kess-Kess mounds Hamar Laghdad, Lower Devonian, Morocco. Sedimentary Geology 263-264(none): 0-0, 2012

Controls of mud mound formation; the Early Devonian Kess-Kess carbonates of the Hamar Laghdad, Antiatlas, Morocco. Geologische Rundschau 81(1): 15-44, 1992

A comparison between the Kess-kess of Hmar Lakhdad (Emsian, Morocco) and the mud mounds of the Philippeville Anticlinorium (Frasnian, Belgium). Geologica Belgica 1(1): 17-31, 1998

A comparison between the Kess-kess of Hmar Lakhdad and the mud mounds of the Philippeville Anticlinorium. Geologica Belgica 1(1): 17-31, 1998

Distribution of Tabulata in the Emsian kess-kess of Hmar Lakhdad SE of Erfoud, Tafilalt, Marocco Repartition des tabules dans les kess-kess emsiens de Hmar Lakhdad SE dErfoud, Tafilalt, Maroc. Geologica et Palaeontologica. 31 August; 35: 53-61, 2001

Steep-sided carbonate mud mounds in the Middle Devonian of the eastern Anti-Atlas, Morocco. Geological Magazine. January; 1301: 69-83, 1993

Diagenesis of Middle Devonian carbonate mounds of the Mader Basin (eastern Anti-Atlas, Morocco). Journal of Sedimentary Research 67(0): 0-0, 1997

The chemistry and biota of the Devonian submarine hydrothermal vents from the eastern Anti-Atlas, Morocco. Abstracts with Programs - Geological Society of America 35(6): 148, 2003

Middle Devonian reef and mud mounds on a carbonate ramp; Mader Basin (eastern Anti-Atlas, Morocco). Geological Society Special Publications 149: 417-435, 1998