Earth:Kerimasi

Short description: Volcano in Arusha Region of Tanzania

Kerimasi
Mlima Kerimasi  (Swahili)
Kerimasi from the west
Highest point
Peak	Kerimasi Peak
Elevation	2,602 m (8,537 ft)
Coordinates
Geography
Country	Tanzania
Region	Arusha Region
District	Monduli District
Geology
Mountain type	Shield
Volcanic region	Crater Highlands
Last eruption	Pleistocene
Climbing
Access	Public

Kerimasi Volcano, also known as Kerimasi (Mlima Kerimasi, in Swahili) at 2,602 metres (8,537 ft) is an extinct shield volcano located in Monduli District of Arusha Region in Tanzania. The majority of the mountain lies in Engaruka Ward, and a quarter of it is in the Ngorongoro Conservation Area. The volcano is located in the geographic area known as the Crater Highlands and is a shield volcano that last erupted in the Pleistocene.

Geology and Mineral composition

Kerimasi, an extinct nephelinite volcano in northern Tanzania's eastern rift valley, emitted carbonatite tephra during its final eruptive phase. The tephra was primarily composed of alkali carbonatite, making it the earliest well-documented example of premodern natrocarbonatite volcanism. The main carbonate mineral was nyerereite, which is also the major mineral in present natrocarbonatite lava flows from the neighboring volcano Oldoinyo Lengai. Kerimasi's nyerereite was leached of its alkalis by meteoric water, and it is currently represented by calcite pseudomorphs.