Hernandez-Pacheco, AlfredoValls, M. C.2018-12-032018-12-031982-07HERNANDEZ-PACHECO, Alfredo; VALLS, M. C. (1982). The historic eruptions of La Palma Island (Canaries). "Arquipélago. Série Ciências da Natureza", 3: 83-94.http://hdl.handle.net/10400.3/4915International Symposium on the Activity of Oceanic Volcanoes. Ponta Delgada, 4-9 August 1980.From the first contacts of the European navigators who first visited the Canary Islands, around the middle of the XIV century, 18 eruptions he.ve taken place of which seven occurred on the island of La Palma. A historic-bibliographic study as well as a detailed field work have enabled us to accurately determine the places, dates, duration and volcanological patterns as well as the petrology and geochemistry of this historic eruptive cycle. In every instance, alcaline basalitic lavas were emitted: true basalts, basanitoids and/or ankaramites. A differentiation process always took place in the magma chamber and a sequence from amphibole to olivine-bearing lavas was erupted. These variations of the chemistry and mineralogy of the lavas were related to the different stages of the emption and the height over sea level, where the corresponding eruptive vents opened. The two main structural trends of the historic subhistoric volcanism of La Palma are N 5° W and N 35° W. Both trends correspond to the predominant ones of the dike swarms of the Basal Complex of the island. The secondary trends, N 80° E and N 15° E, likewise coincide with the corresponding main directions of the dike swarms of the Basal complexes of La Gomera and Fuerteventura. The duration of these historic eruptions was between 1 to 3 months and the area covered with lava and pyroclasts was 37 km2, 5 % of the total surface of the island.engPetrologyVolcanismLa Palma Island (Canaries)journal article