Geology of Madagascar
Geologic map data from
http://app.databasin.org/app/pages/mapPage.jsp?id=100382a48d68454fa8de9583b7fbae79
Overview
Two-thirds of the area of the country on the east side is mainly basement rocks which date back to the Precambrian.
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A remaining third on the west coast of the island contains various sedimentary rocks formed in Late Paleozoic to Tertiary.
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Volcanic activities recorded in volcanic rocks can be found sparsely through the country.
Tectonic Evolution
Geology of Madagascar Today
Basement Rocks
The basement rocks are classically divided into 3 main sequences, Androyan, Graphite and Vohibory Sequences, from east to west, and presumably from oldest to youngest.
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The three sequences are found associated with other units of igneous and metamorphic rocks various in age.
Ashwal and Tucker, 1999
Phanerozoic Sedimentary Rocks
Late Paleozoic to Tertiary sedimentary rocks can be found along west coast of the island.
The sedimentation occurred in three depositional basins: Diego, Majunga and Morondava Basins, from north to south.
Both marine and continental facies of sedimentary rock are found in each of the three basins.
Boast and Nairn, 1982
Let's Explore Madagascar
Basic Info
Get to know better about this country. Location, historical background, people and more.
Geology
How did this island form? What were the key depositional and tectonic settings behind it.
Biodiversity
Hiding in dense rain forest of isolated island live exotic animals to be encountered.
Tourist Attractions
Where to visit.
What to eat.
When to go.