A detailed vibrational Raman-IR spectroscopic and diffractional analyses have been performed on basalts
from two locations from Tenerife Island: (1) the Arenas Negras volcano which belongs to the historical
eruption not showing visible alteration and (2) Pillow Lavas zone from Anaga Massif which shows a
clearly fluid-rock interaction caused by submarine alteration. These places have been extensively studied
due to its similarity with the surface of Mars. The analysis is based on the mineral detection of selected
samples by a Micro-Raman study of the materials. The complementary techniques have confirmed the
mineralogy detected by the Raman measurement. The results show a volcanic environment behavior
with primary phases like olivine, pyroxene, and feldspar/plagioclase. Moreover, the presence of accessory
minerals or secondary mineralization like phosphate, iron oxides, zeolite or carbonates shows the
alteration processes on each outcrop. The variation in the crystallinity and amorphous phases is related
to fluid-rock interaction caused by hydrothermal episodes and external weathering processes, which
shows several analogies with the ancient volcanic activity from Mars.
