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Home » Blog » Unveiling the Secrets of an Ancient Ocean: Tracing Earth’s Past Oxygenation
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Unveiling the Secrets of an Ancient Ocean: Tracing Earth’s Past Oxygenation

Rudrakshi Gupta
Rudrakshi Gupta
Last updated: 2023/07/28 at 9:20 AM
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Ancient ocean's and earth's past oxygenation
Ancient ocean’s and earth’s past oxygenation

Deep within the majestic Himalayas, a ground breaking discovery has emerged, unravelling the mysteries of a bygone era. A joint team of Indo-Japanese scientists from the Indian Institute of Science (IISc) in Bengaluru and Niigata University in Japan has unearthed traces of an ancient ocean that once thrived approximately 600 million years ago. Locked within mineral deposits in the sedimentary basins of the western Kumaon Himalayas, these precious droplets of water have offered a glimpse into Earth’s past and the momentous event of oxygenation that shaped life as we know it.

Imagine a time when the Earth’s landscape was vastly different from what it is today – an era when an ocean flourished amid the towering Himalayan mountains. In their pursuit of understanding the planet’s history, the team embarked on an ambitious expedition, exploring a vast stretch from Amritpur to the Milam glacier and Dehradun to the Gangotri glacier region. This concerted effort resulted in a treasure trove of findings that could revolutionize our understanding of the Earth’s ancient past.

Lead researcher Prakash Chandra Arya, a PhD student at the Centre for Earth Sciences (CEaS) at IISc, described the mineral deposits as “time capsules for paleo oceans.” These deposits, rich in calcium and magnesium carbonates, contain preserved remnants of the pristine ocean that existed eons ago.

Through meticulous analysis of the mineral deposits, the team deduced that the sedimentary basins endured a prolonged period of calcium deprivation, presumably due to reduced riverine input. This scarcity of calcium prompted a surge in magnesium levels, leading to the crystallization of magnesium deposits that trapped the ancient ocean water within.

“During this time, there was no flow in the oceans, and hence no calcium input. When there is no flow or calcium input, as more calcium precipitates, the amount of magnesium goes up,” explained Sajeev Krishnan, a Professor at CEaS and the corresponding author of the study.

The consequences of this unique geological occurrence extended far beyond the mineral deposits. The lack of calcium in the region may have caused nutrient deficiencies, creating favorable conditions for slow-growing photosynthetic cyanobacteria. These ancient organisms are believed to have been crucial players in the significant Second Great Oxygenation Event that occurred in Earth’s history.

As cyanobacteria flourished, they embarked on a transformative journey, releasing copious amounts of oxygen into the atmosphere. This was a pivotal turning point for the planet, as oxygen levels began to rise dramatically. This rise in atmospheric oxygen had far-reaching consequences for the evolution of life, making it possible for complex organisms to emerge and thrive.

The implications of this discovery are momentous. The team’s extensive laboratory analyses have confirmed that the mineral deposits originated exclusively from precipitation derived from the ancient ocean water and not from alternative sources, such as the Earth’s interior or submarine volcanic activities.

The revelation of an ancient ocean in the Himalayas stands as a testament to the marvels hidden within our planet’s geological history. These findings not only provide a window into the Earth’s past but also offer valuable insights into the mechanisms that shaped our world and paved the way for life as we know it today.

This momentous discovery is a testament to the power of international collaboration and the relentless pursuit of knowledge. The joint efforts of Indo-Japanese scientists have illuminated a chapter in our planet’s history that was once buried deep within the heart of the Himalayas. As the scientific community delves deeper into the secrets of this ancient ocean, who knows what other wonders they may unearth, unlocking the mysteries of our past and shining a light on the path ahead for the future of Earth.

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TAGGED: ancient Ocean, Earth exploration, Express hunt
Rudrakshi Gupta July 28, 2023
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