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Earth of fire

Actualité volcanique, Article de fond sur étude de volcan, tectonique, récits et photos de voyage

Publié par Bernard Duyck
Publié dans : #Actualités volcaniques

Other volcanic structures mark the hotspot Cordillera south of the Canary Islands:

Tropic seamount - 23 ° 53.09 'N / 20 ° 42.64' W - is a pseudo-circular base guyot with a cross-shaped top, its southern tip forming an angle of 90 ° and 60 respectively . Its area is 1,529 km². Its slopes are steep, with a maximum tilt of 62.5 °, and have important avalanche scars.

Tropic seamount - 3D bathymetric picture above - down, digital model of Tropic seamount on the basis of data Multihaz - Doc. Informs Científico-Técnico of Campaña oceanográfica DRAGO 0511 - Vasquez et al.
Tropic seamount - 3D bathymetric picture above - down, digital model of Tropic seamount on the basis of data Multihaz - Doc. Informs Científico-Técnico of Campaña oceanográfica DRAGO 0511 - Vasquez et al.

Tropic seamount - 3D bathymetric picture above - down, digital model of Tropic seamount on the basis of data Multihaz - Doc. Informs Científico-Técnico of Campaña oceanográfica DRAGO 0511 - Vasquez et al.

Iron and manganese crusts are abundant in metric dimensions in all sampled seamounts (Exarcan project). The internal structure is laminar to columnar, formed by layering slices of oxides and hydroxides of iron and manganese, occasionally colonized by corals or tube worms. The base of the crust is formed of volcanic rocks, lapilli and carbonates.

Tropic seamount : Fe-Mn crusts on bedrock, photo taken at a depth of 1,300 meters - Doc. Informs Científico-Técnico of Campaña oceanográfica DRAGO 0511 - Vasquez et al.

Tropic seamount : Fe-Mn crusts on bedrock, photo taken at a depth of 1,300 meters - Doc. Informs Científico-Técnico of Campaña oceanográfica DRAGO 0511 - Vasquez et al.

Tropic seamount - altered, and little vesicle basalt - with vacuoles containing pyroxene and calcite. - Doc. Informs Científico-Técnico of Campaña oceanográfica DRAGO 0511 - Vasquez et al.

Tropic seamount - altered, and little vesicle basalt - with vacuoles containing pyroxene and calcite. - Doc. Informs Científico-Técnico of Campaña oceanográfica DRAGO 0511 - Vasquez et al.

Tortuga is a submarine volcano -shaped sub-elliptical cone in form of a turtle with its head northeast. Located at coordinates 25 ° 51.39 'N / 20 ° 41.45' W, it is a small area compared to previous structure, 25.72 km², with slopes of 45 ° max, for a height of 700 meters . Debris avalanche deposits observed southeast.

Tortuga seamount - bathymetric 3D image - Doc. Informs Científico-Técnico of Campaña oceanográfica DRAGO 0511 - Vasquez et al.

Tortuga seamount - bathymetric 3D image - Doc. Informs Científico-Técnico of Campaña oceanográfica DRAGO 0511 - Vasquez et al.

Infinito Hill - 8.18 ° 26 'N / 21 ° 25.62' W - two cones form the hills aligned NE-SW, one conical, the other with a deep central depression 70 meters. This small structure of 5.13 km on 2.79 / 12.29 km², has slopes up to 49 °.
 

Infinito Hill - bathymetric 3D image - Doc. Informs Científico-Técnico of Campaña oceanográfica DRAGO 0511 - Vasquez et al.

Infinito Hill - bathymetric 3D image - Doc. Informs Científico-Técnico of Campaña oceanográfica DRAGO 0511 - Vasquez et al.


Other seamounts, from the largest to the smallest, are detailed in the original document.

 

Sources :

- Avcan noticias - El otro archipiélago sumergido de Canarias - link

- Informe Científico Técnico de la Campaña DRAGO 0511 - by Vázquez & al.- link

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