Search results
Results from the WOW.Com Content Network
A relief map of the Azores Triple Fault region and southern bathymetric zone. The hydrothermal vents and seamounts of the Azores (Portuguese: fontes hidrotermais e montes submarinos dos Açores) are a series of Atlantic seamounts and hydrothermal vents that are part of the Mid-Atlantic Ridge system, giving rise to the archipelago and bathymetric region of the Azores.
Rainbow is located on a massif at 2,275–2,335 m (7,464–7,661 ft) depth, shared with two fossil (mostly inactive) vent sites Ghost City and Clamstone. [2] As a slow-spreading ridge at approximately 2.2 cm/yr, extensive faulting has uplifted gabbro and peridotite and exposed ultramafic rock to cold seawater. [6]
Consequently, many of the Medieval maps and charts that showed the Ocean Sea (the Atlantic Ocean) identified an island (or islands) represented in different positions or forms. The island of Brasil and/or Antillia (from the Brendan context) and the island of Sete Cidades, were usual geographic references that persisted in the proto-geography of ...
Obsidian has also been found in Gilat, a site in the western Negev in Israel. Eight obsidian artifacts dating to the Chalcolithic Age found at this site were traced to obsidian sources in Anatolia. Neutron activation analysis (NAA) on the obsidian found at this site helped to reveal trade routes and exchange networks previously unknown. [52]
The Sete Cidades Massif occupies the northwestern portion of the island and corresponds to a circular central caldera 6 by 5 kilometres (3.7 mi × 3.1 mi), whose interior is occupied by various lakes and volcanic cones of pumice, lava domes and maars.
The lake is situated within the caldera of the Sete Cidades Massif, an ancient volcano built on various layers of ash, pyroclasts and trachyte and basaltic lavas.It is a stratovolcano constructed from alternating phases of explosive and effusive ejecta, from dominantly basaltic pre-caldera eruptions, a trachytic caldera-forming stage and a post-caldera stage consisting of alternating trachytic ...
Due to it being an archipelago, the Azores Geopark is disperse: guaranteeing a representative geodiversity that characterizes the Azorean territory; manifesting in a history based on geological and active volcanism; with conservation strategies that are common; and based on a decentralized management structure with supports in all islands.
They add that if the Carthaginians did reach the Azores the lack of a native population meant that there would not necessarily be any evidence, and "scholars who reject even the possibility of Atlantic voyages in antiquity seem" to be accepting a myth promulgated by the Phoenicians that the Atlantic was inherently impassable with the seafaring ...