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Gold-Sulfur Complex Identified as Key Factor in Gold Deposit Formation

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Gold-Sulfur Complex Found to Play Crucial Role in Gold Deposit Formation

An international team of scientists has made a groundbreaking discovery that could transform our understanding of gold deposit formation on Earth. Led by Adam Simon, Professor of Earth and Environmental Sciences at the University of Michigan, the study uncovers the crucial role of a gold-sulfur complex in transporting gold from deep within the Earth’s mantle to the surface. The findings, published in Proceedings of the National Academy of Sciences (2024), offer new insights into the conditions under which gold is mobilized and concentrated in Earth’s crust.

The Gold-Trisulfur Complex: A Key to Gold’s Journey

According to the study, gold is transported in the Earth’s mantle in a complex form known as the gold-trisulfur complex. This complex forms under specific temperature and pressure conditions, typically located 30 to 50 miles beneath active volcanic zones. For years, the existence of such a complex was debated, but this research has solidified its role in enriching magma with gold as it rises towards the surface. The discovery also helps explain why certain areas, particularly subduction zones, are particularly rich in gold deposits.

Subduction Zones and Volcanic Activity as Gold Sources

The researchers specifically highlight subduction zones, such as those around the Pacific Ring of Fire, as key regions for gold formation. These areas, known for their high volcanic activity, provide an ideal geological environment for gold to be carried from the mantle to surface deposits through volcanic eruptions. Locations such as New Zealand, Japan, Alaska, and Chile, which lie within these active volcanic regions, are some of the richest in gold, thanks to the unique geological processes at play in subduction zones. The study links volcanic eruptions to the mechanisms that concentrate gold in these zones, shedding light on how gold deposits form in these high-activity areas.

Implications for Gold Mining and Exploration

This new understanding of how gold is transported from deep within the Earth to surface deposits opens up new avenues for gold exploration and mining. By targeting subduction zones with the right conditions for the formation of gold-sulfur complexes, geologists and mining companies can potentially uncover new gold reserves in regions that were previously unexplored. This discovery not only improves our knowledge of the Earth’s processes but also enhances the accuracy and efficiency of gold prospecting in volcanic regions around the world.

NASA’s Parker Solar Probe Makes Closest-Ever Approach to the Sun

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NASA’s Parker Solar Probe is embarking on a historic mission, attempting the closest-ever approach to the Sun. The spacecraft is plunging into the Sun’s outer atmosphere, known as the corona, enduring extreme temperatures and radiation in a bid to unlock the mysteries of our star.

This daring fly-by will leave the probe out of communication for several days. Scientists will anxiously await a signal, expected at 05:00 GMT on 28 December, to confirm whether the probe has survived the intense conditions. The goal is to deepen our understanding of the Sun’s behavior and how it affects the solar system.

Dr. Nicola Fox, NASA’s head of science, emphasized the importance of firsthand exploration: “For centuries, people have studied the Sun, but you don’t experience the atmosphere of a place until you actually go visit it. And so we can’t really experience the atmosphere of our star unless we fly through it.”

Launched in 2018, the Parker Solar Probe has already completed 21 orbits around the Sun, gradually getting closer with each pass. The Christmas Eve mission is a groundbreaking moment, bringing the probe within 3.8 million miles (6.2 million km) of the Sun’s surface. Though this distance may seem vast, Fox puts it into perspective: “We are 93 million miles away from the Sun, so if I put the Sun and the Earth one metre apart, Parker Solar Probe is just four centimetres from the Sun.”

During its approach, the spacecraft will endure temperatures of 1,400°C (2,552°F) and radiation strong enough to damage its electronics. To protect it, the probe is shielded by a 11.5cm-thick (4.5 inches) carbon-composite heat shield. The spacecraft’s strategy is to fly in and out quickly, racing at an astonishing speed of 430,000 mph (700,000 km/h) — faster than any man-made object in history.

The Parker Solar Probe’s primary mission is to investigate the Sun’s corona, which remains an enigma for scientists. Dr. Jenifer Millard, an astronomer, explains, “The surface of the Sun is about 6,000°C, but the corona reaches millions of degrees — and it’s farther from the Sun. How is the outer atmosphere getting hotter?”

The probe’s journey will also help scientists study solar wind, the constant flow of charged particles from the corona. This space weather can lead to phenomena like auroras, but it can also disrupt power grids, communication systems, and electronics on Earth. “Understanding the Sun and its activity is so important to our everyday lives on Earth,” says Dr. Millard.

As the spacecraft is out of contact with Earth, NASA scientists are anxiously awaiting the return of a signal. Fox admitted to feeling nervous about the probe’s audacious attempt but remains confident in its design. “We really have designed it to withstand all of these brutal conditions. It’s a tough, tough little spacecraft,” she says.

If successful, the Parker Solar Probe will continue its groundbreaking mission, providing valuable insights into the Sun’s behavior and its impact on space weather for years to come.

 

AI’s Groundbreaking Contributions to Science in 2024

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In 2024, artificial intelligence (AI) reached a milestone, solidifying its role as a transformative tool in scientific research. The Nobel committee acknowledged AI’s impact by awarding the physics prize to John Hopfield and Geoffrey Hinton for their pioneering work in machine learning, which laid the foundation for modern AI applications. AI’s contributions this year have been far-reaching, from unlocking ancient texts to advancing our understanding of life at its most molecular level.

One of the most notable AI-assisted breakthroughs was in the decoding of the Herculaneum scrolls, ancient papyri that survived the eruption of Mount Vesuvius in AD 79. With the help of AI and high-resolution X-rays, researchers have now been able to decipher more than 2,000 characters from these nearly unreadable scrolls. The Vesuvius Challenge, a competition to expedite the deciphering process, has set a goal to unlock 90% of the scrolls by the end of 2024. AI’s ability to virtually flatten the charred scrolls and distinguish ink from carbonized papyri has made this remarkable feat possible, offering unprecedented insights into ancient Rome and Greece.

Another area where AI is making waves is in the study of animal communication. Machine learning has enabled scientists to begin understanding the complex “language” of sperm whales. By analyzing 9,000 click sequences, researchers have identified patterns that resemble human phonetics, such as rhythm, tempo, and ornamentation. While the meaning of these clicks remains elusive, AI’s ability to detect these intricate patterns is opening the door to potential communication with marine mammals. The same techniques are being applied to other species, offering a new way to understand animal languages.

In the field of archaeology, AI is helping to uncover ancient sites in remote and challenging environments. In the Nazca Desert, AI models trained on high-resolution imagery have nearly doubled the number of known geoglyphs in just a few months. While the models are not yet perfect, they hold immense potential for surveying hard-to-reach areas, making AI an indispensable tool for archaeologists. Similarly, AI is aiding in the identification of burial mounds in Mongolia, demonstrating its utility in archaeological research across diverse terrains.

AI is also revolutionizing the understanding of life at the molecular level. The development of AlphaFold by Google DeepMind has accelerated progress in protein structure prediction, solving a long-standing challenge in physical chemistry. This AI tool, now used by millions of researchers, predicts the 3D shapes of proteins from their amino acid sequences, speeding up advancements in biology and medicine. While there are limitations—such as the inability to predict the impact of certain mutations—AlphaFold remains a game-changer in biomedical research.

These examples reflect the growing influence of AI in scientific discovery. From unraveling ancient mysteries to decoding the language of animals and advancing medical research, AI is proving to be a superpower in science. As the field continues to evolve, its potential to solve complex problems and uncover the unknown remains boundless.