What is the Singhbhum Craton?

About Singhbhum Craton:

• The Singhbhum Craton, located in eastern India (Jharkhand and Odisha states) between the Chhota Nagpur plateau and the Eastern Ghats, is one of the oldest and most important cratons in the Indian Shield.
  • A craton is a stable continental block composed of ancient crystalline rocks, typically surrounded by mobile belts.
  • Studying them offers a window into how processes within and on the surface of Earth operated in the past.
• It represents a fragment of the ancient Gondwana supercontinent and holds significant geological and economic importance due to its rich mineral resources.
• This ancient part of the Earth’s crust has been found in previous research to date back to 3.5 billion years ago.
• The craton’s oldest rock assemblages are largely volcanic and sedimentary rocks, also known as greenstone successions.
  • Greenstones are rock assemblages made up mostly of sub-marine volcanic rocks with minor sedimentary rocks.
• The geology of this area shares stark similarity with the greenstone belts documented in South Africa’s Barberton and Nondweni areas and the Pilbara Craton in western Australia.
  • All these areas experienced widespread submarine mafic — meaning high in magnesium oxide — volcanic eruptions between 3.5 and 3.3 billion years ago, preserved as pillowed lava and komatiites.
• Significance:
  • They offer a clearer picture of Earth’s early tectonic activities during the Archaean times, contributing to our understanding of the planet’s formative years.
  • The Singhbhum Craton’s unique geological features, including its greenstone belts, provide invaluable information about Earth’s surface and atmospheric processes.
  • This is crucial for hypothesising early habitable conditions and the emergence of life on Earth.