The experts from the Volcanological Observatory of INGEMMET during their ascent to the summit of Sabancaya made during the period of 09 and 10 July, recognized the ash emitted by the volcano in recent weeks.
This ash is gray and the grains are smaller than 0.5 mm. Crystals of plagioclase, biotite and amphibole (magmatic silicates) are observed. Plagioclase crystals are less than 0.5 mm ,some have tabular forms. The biotite are up to 0.2 mm and are slightly modified. Amphibole are encompassed by the fresh and youthful lithic. Similarly, glass measuring up to 0.1 mm is observed, this one is translucent and amorphous.
Furthermore, the samples show two different types of lithic: fresh or dark gray juvenile, measuring up to 0.3 mm and oxidized reddish up to 0.2 mm. Especially juveniles predominate in the fragments of ash suggesting that Sabancaya has entered into a eruptive phase of magmatic origin, which may increase in the weeks or months.
July 18, 2015. Sabancaya, Perou :
Source : Ingemmet.
Photo : Ingemmet, Summitpost.