Petrological features of picrobasaltic melts on Lanzarote, Canary Islands

L.S Canhimbue,K.G Erofeeva,S.V Mezhelovskaya,V.S Litvinenko

doi:10.1051/e3sconf/202126607006

Abstract

The paper discusses issues related to the petrology of picrobasaltic melts forming lava flows on Lanzarote, Canary Islands. During ascientific and educational expedition on the aforementioned island, lava flows of picro basalt of the third phase of the 1731–1732 eruption were studied and tested. Preference was given to the well-preserved streams in the west and south of the island thatare accessible for direct study. Volcanogenic-sedimentary associations were identified in the studied outcropsand described, the structural and textural features of the flows were characterized, and samples with mantle rock xenoliths were taken for petrological reconstructions. New geochemical data onrocks and minerals are presented. It was established that the temperature of the initial melt was 1100–1180°C. Large harzburgitephenocrysts in picro basalt are xenocrysts formed as a result of melting and disintegration of mantle xenoliths.

Highlights

The presence of basic magmatism is characteristic of various geotectonic sittings [1]
Mainmagmatism is predominant, whereas the generation of melts occurs at mantle levels under the influence of thermal anomaly
The presence of xenoliths in basalts makes it possible to identify the composition of the mantle beneath the region and estimate the contribution of mantle rocks to the formation of basaltic melts

Summary

Introduction

The presence of basic magmatism is characteristic of various geotectonic sittings [1]. The presence of xenoliths in basalts makes it possible to identify the composition of the mantle beneath the region and estimate the contribution of mantle rocks to the formation of basaltic melts. The islands of the Canary archipelago have a highly dissected relief and are often eroded and brought to the surface near coastal deposits, which makes these sites attractive for geological study. Over the past two decades, deposits of the islands of the Canary archipelago have been extensively studied and characterized by a complex of geological and geophysical methods[2, 3, 4, 5, 6, 7, 8]. The origin of melts from the islands of the Canary archipelago is widely discussed in the world literature [5, 9, 14, 16, 18, 19]

Methods

Findings

Discussion

Conclusion