Overview

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Birimian rocks are major sources of gold and diamonds that extend through Ghana, the Ivory Coast, Guinea, Mali and Burkina Faso. They are named after the Birim River, one of the main tributaries of the Pra River in Ghana and the country's most important diamond-producing area. Ghana and Mali are the second and third largest producers of gold in Africa. The Birimian terranes in the south part of the West African craton are a mix of metamorphosedvolcanic, sedimentary and plutonic rocks and low grade metavolcanics and metasediments. Almost half of the terranes consist of alkaline granites. The rocks formed over a period of about 50 million years between 2.200Ga and 2.100Ga years ago. The Birimian rocks stretch across the countries to the north of the Gulf of Guinea, forming parallel belts that generally trend northeasterly and are 40 to 50 km wide and about 90 km apart. They consist of interlayered sedimentary and volcanic flow rocks metamorphosed to low greenschist facies. Most rivers draining the Birimian rocks hold alluvial gold deposits. They are overlaid in places by quartz-pebble conglomerates within the Tarkwaian System.

Full Product Details

9786137421420

Table of Contents

Reviews

Author Information

Tab Content 6

Customer Reviews

Recent Reviews

Countries Available