AFRICA HEADING FOR A CONTINENTAL BREAKUP from Vajirao & Reddy Institute

AFRICA HEADING FOR A CONTINENTAL BREAKUP

Why is this issue in the news?

• Researchers have stated that Africa is slowly breaking apart due to ongoing tectonic activity beneath the continent.
• Scientific studies suggest that Africa may split into two separate landmasses within the next 5 to 10 million years.
• This process could eventually lead to the formation of a new ocean basin.
• The findings are based on new analysis of magnetic data and long-term geological observations.

WHAT EXACTLY IS HAPPENING TO THE AFRICAN CONTINENT?

• Africa is undergoing a gradual but continuous geological separation.
• The crust beneath Africa is stretching, thinning, and tearing apart.
• Scientists compare this movement to “the zip on a jacket”, opening slowly from northeast to south.
• The process is accompanied by volcanic activity, earthquakes, and seismic movements.

When is the complete breakup expected?

• According to geological timelines, the continental split is expected to be completed in the next 5 to 10 million years.
• Scientists emphasise that this is an extremely slow process, not perceptible in human lifetimes.

What will Africa look like after the split?

• After the breakup, Africa will likely exist as two distinct landmasses.

Western African landmass This larger portion is expected to include:

• Egypt
• Algeria
• Nigeria
• Ghana
• Namibia

Eastern African landmass This smaller block will likely include:

• Somalia
• Kenya
• Tanzania
• Mozambique
• Large parts of Ethiopia

SCIENTIFIC BASIS: THE THEORY OF PLATE TECTONICS

• The explanation for this phenomenon lies in the Theory of Plate Tectonics.
• This theory states that:
  • Earth’s continents sit on tectonic plates.
  • These plates are constantly moving, though very slowly.

• Over millions of years, continents break apart and move, leading to:
  • Formation of new oceans, and
  • Creation of new crust through seafloor spreading.

Continents have never been fixed in Earth’s history. EAST AFRICAN RIFT

• The most important region for this breakup is the East African Rift System.
• It is a massive tectonic fissure about 4,000 miles long.
• It stretches from Jordan, passing through East Africa, and reaches Mozambique.
• The rift is approximately 30–40 miles wide on average.

WHAT CHANGES ARE OCCURING IN EAST AFRICAN RIFT?

• The Earth’s crust in this region is weakening and pulling apart.
• Over geological time, the rift is expected to:
  • Grow deeper, and
  • Eventually be filled by ocean water.
• The rift is also expected to pass through major lakes such as:
  • Lake Malawi
  • Lake Turkana

THE AFAR REGION

• Scientists have focused on the Afar region, which lies at the junction of:
  • The Red Sea, and
  • The Gulf of Aden.

Why Afar is special

• It hosts a triple junction, where three rift systems meet:
  • Main Ethiopian Rift
  • Red Sea Rift
  • Gulf of Aden Rift
• A triple junction is considered a classic indicator of continental breakup.
• Scientists believe Afar shows the earliest visible stage of a new ocean formation.

ROLE OF MAGNETIC DATA

• Researchers re-analysed magnetic data collected in 1968 and 1969 using modern techniques.
• The data was gathered using airborne magnetic surveys.

Why magnetic data matters

• When magma cools, it records the Earth’s magnetic field direction.
• These magnetic patterns behave like:
  • Barcodes, or
  • Tree rings, preserving geological history.

WHAT DID THE MAGNETIC DATA REVEAL?

• The data showed evidence of ancient magnetic reversals, proving that:
  • Seafloor spreading had already occurred between Africa and Arabia millions of years ago.
• This confirms that the region has been undergoing slow but steady rifting for tens of millions of years.

Evidence of steady rifting

• The Earth’s crust in the rift zone is stretching like soft material.
• Over time, this stretching leads to:
  • Thinning of crust
  • Eventual rupture
  • Formation of a new ocean basin

SPEED OF THE CONTINENTAL BREAKUP

• According to Dr Emma Watts, a geochemist at Swansea University:
  • The plates are currently separating at a rate of about 5 to 16 millimetres per year in the northern section.
• This confirms that while the process is active, it remains extremely slow.

  Note: Connect with Vajirao & Reddy Institute to keep yourself updated with latest UPSC Current Affairs in English. Note: We upload Current Affairs Except Sunday.