Emma McNulty

Document Type

Thesis

Date of Award

2017

Keywords

Earth sciences, East Africa, Magadi, Nahcolite, Soda lake, Sodium carbonate, Trona

Degree Name

Master of Science (MS)

Department

Geological Sciences and Environmental Studies

First Advisor

Tim Lowenstein

Subject Heading(s)

Earth science; East Africa; Magadi; Nahcolite; Soda lake; Sodium carbonate; Trona; Geology

Abstract

The Magadi Basin, Kenya, within the East African Rift Valley, contains two closed-basin alkaline lakes, Lake Magadi and Nasikie Engida that now precipitate trona (Na2CO3.NaHCO3.2H2O) and nahcolite (NaHCO3). Observations of the conditions of modern trona and nahcolite deposition in the Magadi Basin form the basis of the “soda lake cycle”. This study aims to use the sedimentary structures of the modern sodium carbonates of Lake Magadi as an analogue for similar ancient deposits around the world, including the vast trona and nahcolite deposits of the Eocene Green River Formation. Lake Magadi has been evolving since 1.08 Ma within a well-known region of early hominin activity in East Africa. As part of the Hominin Sites and Paleo-lakes Drilling Project (HSPDP) four boreholes were drilled beneath Lake Magadi up to a maximum depth of 197 m. Analysis of three of the extracted sediment cores has provided information on the evolution of Lake Magadi from the Late Pleistocene to present.

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