Beneath the ice in Antarctica

Antarctica has a huge, completely hidden mountain range. New data reveals its birth over 500 million years ago

The Gamburtsev Subglacial Mountains are hidden by deep ice. Merkushev Vasiliy/Shutterstock

Jacqueline Halpin, University of Tasmania and Nathan R. Daczko, Macquarie University

Have you ever imagined what Antarctica looks like beneath its thick blanket of ice? Hidden below are rugged mountains, valleys, hills and plains.

Some peaks, like the towering Transantarctic Mountains, rise above the ice. But others, like the mysterious and ancient Gamburtsev Subglacial Mountains in the middle of East Antarctica, are completely buried.

The Gamburtsev Mountains are similar in scale and shape to the European Alps. But we can’t see them because the high alpine peaks and deep glacial valleys are entombed beneath kilometres of ice.

How did they come to be? Typically, a mountain range will rise in places where two tectonic plates clash with each other. But East Antarctica has been tectonically stable for millions of years.

Our new study, published in Earth and Planetary Science Letters, reveals how this hidden mountain chain emerged more than 500 million years ago when the supercontinent Gondwana formed from colliding tectonic plates.

Our findings offer fresh insight into how mountains and continents evolve over geological time. They also help explain why Antarctica’s interior has remained remarkably stable for hundreds of millions of years.

A radar image showing the Gamburtsev mountain range under layers of ice. Creyts et al., Geophysical Research Letters (2014), CC BY-SA

A buried secret

The Gamburtsev Mountains are buried beneath the highest point of the East Antarctica ice sheet. They were first discovered by a Soviet expedition using seismic techniques in 1958.

Because the mountain range is completely covered in ice, it’s one of the least understood tectonic features on Earth. For scientists, it’s deeply puzzling. How could such a massive mountain range form and still be preserved in the heart of an ancient, stable continent?

Most major mountain chains mark the sites of tectonic collisions. For example, the Himalayas are still rising today as the Indian and Eurasian plates continue to converge, a process that began about 50 million years ago.

Plate tectonic models suggest the crust now forming East Antarctica came from at least two large continents more than 700 million years ago. These continents used to be separated by a vast ocean basin.

A map of the topography (a) and surface elevation (b) of Antarctica, measured in metres above sea level; (c) shows ice thickness in metres. Pritchard et al., Scientific Data (2025), CC BY

The collision of these landmasses was key to the birth of Gondwana, a supercontinent that included what is now Africa, South America, Australia, India and Antarctica.

Our new study supports the idea that the Gamburtsev Mountains first formed during this ancient collision. The colossal clash of continents triggered the flow of hot, partly molten rock deep beneath the mountains.

As the crust thickened and heated during mountain building, it eventually became unstable and began to collapse under its own weight.

Deep beneath the surface, hot rocks began to flow sideways, like toothpaste squeezed from a tube, in a process known as gravitational spreading. This caused the mountains to partially collapse, while still preserving a thick crustal “root”, which extends into Earth’s mantle beneath.

Mountain building causes deep crustal rocks to deform, fold and partially melt. Jacqueline Halpin

Crystal time capsules

To piece together the timing of this dramatic rise and fall, we analysed tiny zircon grains found in sandstones deposited by rivers flowing from the ancient mountains more than 250 million years ago. These sandstones were recovered from the Prince Charles Mountains, which poke out of the ice hundreds of kilometres away.

Zircons are often called “time capsules” because they contain minuscule amounts of uranium in their crystal structure, which decays at a known rate and allows scientists to determine their age with great precision.

These zircon grains preserve a record of the mountain-building timeline: the Gamburtsev Mountains began to rise around 650 million years ago, reached Himalayan heights by 580 million years ago, and experienced deep crustal melting and flow that ended around 500 million years ago.

Most mountain ranges formed by continental collisions are eventually worn down by erosion or reshaped by later tectonic events. Because they’ve been preserved by a deep layer of ice, the Gamburtsev Subglacial Mountains are one of the best-preserved ancient mountain belts on Earth.

While it’s currently very challenging and expensive to drill through the thick ice to sample the mountains directly, our model offers new predictions to guide future exploration.

Geologists Jacqueline Halpin and Jack Mulder stand on the Denman Glacier during recent fieldwork. Jacqueline Halpin

For instance, recent fieldwork near the Denman Glacier on East Antarctica’s coast uncovered rocks that may be related to these ancient mountains. Further analysis of these rock samples will help reconstruct the hidden architecture of East Antarctica.

Antarctica remains a continent full of geological surprises, and the secrets buried beneath its ice are only beginning to be revealed.

Jacqueline Halpin, Associate Professor of Geology, University of Tasmania and Nathan R. Daczko, Professor of Earth Science, Macquarie University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Sentinel Owl - readership data May 2025

                                                                                                      Shutterstock

Sentinel Owl has been operating principally as a science/environment blog for 17 years as of 2025, and does not employ Google Ads or any form of revenue raising advertising. As of 10th May 2025, the blog has recorded over 367,000 page views. The range of countries from where the blog is accessed spans the world with a very marked emphasis at present from Singapore over the past 30 days. The number of readers is shown below -

Singapore: 32.5 K

Australia: 433

United States: 186 

Brazil: 149

Hong Kong: 98

Turkiye: 23

India: 21

Mexico: 21

Russia:18

Vietnam: 18

Saudi Arabia: 9

Canada: 7

United Kingdom: 6

Indonesia: 6 

Germany: 5

The operating systems used are mainly from -

Macintosh: 16.6K

Android: 9.02K

Windows: 4.84K

iPhone: 3.2K

        

Source: Google Analytics

The new Pope - Leo XIV

Pope Leo XIV faces limits on changing the Catholic Church − but Francis made reforms that set the stage for larger changes

Newly elected Pope Leo XIV appears at the balcony of St. Peter’s Basilica at the Vatican on Thursday, May 8, 2025. AP Photo/Andrew Medichini

Dennis Doyle, University of Dayton

Cardinal Robert Prevost of the United States has been picked to be the new leader of the Roman Catholic Church; he will be known as Pope Leo XIV.

Attention now turns to what vision the first U.S. pope will bring.

Change is hard to bring about in the Catholic Church. During his pontificate, Francis often gestured toward change without actually changing church doctrines. He permitted discussion of ordaining married men in remote regions where populations were greatly underserved due to a lack of priests, but he did not actually allow it. On his own initiative, he set up a commission to study the possibility of ordaining women as deacons, but he did not follow it through.

However, he did allow priests to offer the Eucharist, the most important Catholic sacrament of the body and blood of Christ, to Catholics who had divorced and remarried without being granted an annulment.

Likewise, Francis did not change the official teaching that a sacramental marriage is between a man and a woman, but he did allow for the blessing of gay couples, in a manner that did appear to be a sanctioning of gay marriage.

To what degree will the new pope stand or not stand in continuity with Francis? As a scholar who has studied the writings and actions of the popes since the time of the Second Vatican Council, a series of meetings held to modernize the church from 1962 to 1965, I am aware that every pope comes with his own vision and his own agenda for leading the church.

Still, the popes who immediately preceded them set practical limits on what changes could be made. There were limitations on Francis as well; however, the new pope, I argue, will have more leeway because of the signals Francis sent.

The process of synodality

Francis initiated a process called “synodality,” a term that combines the Greek words for “journey” and “together.” Synodality involves gathering Catholics of various ranks and points of view to share their faith and pray with each other as they address challenges faced by the church today.

One of Francis’ favorite themes was inclusion. He carried forward the teaching of the Second Vatican Council that the Holy Spirit – that is, the Spirit of God who inspired the prophets and is believed to be sent by Christ among Christians in a special way – is at work throughout the whole church; it includes not only the hierarchy but all of the church members. This belief constituted the core principle underlying synodality.

Pope Francis with the participants of the Synod of Bishops’ 16th General Assembly in the Paul VI Hall at the Vatican on Oct. 23, 2023. AP Photo/Gregorio Borgia

Francis launched a two-year global consultation process in October 2022, culminating in a synod in Rome in October 2024. Catholics all over the world offered their insights and opinions during this process. The synod discussed many issues, some of which were controversial, such as clerical sexual abuse, the need for oversight of bishops, the role of women in general and the ordination of women as deacons.

The final synod document did not offer conclusions concerning these topics but rather aimed more at promoting the transformation of the entire Catholic Church into a synodal church in which Catholics tackle together the many challenges of the modern world. Francis refrained from issuing his own document in response, in order that the synod’s statement could stand on its own.

The process of synodality in one sense places limits on bishops and the pope by emphasizing their need to listen closely to all church members before making decisions. In another sense, though, in the long run the process opens up the possibility for needed developments to take place when and if lay Catholics overwhelmingly testify that they believe the church should move in a certain direction.

Change is hard in the church

A pope, however, cannot simply reverse official positions that his immediate predecessors had been emphasizing. Practically speaking, there needs to be a papacy, or two, during which a pope will either remain silent on matters that call for change or at least limit himself to hints and signals on such issues.

In 1864, Pius IX condemned the proposition that “the Church ought to be separated from the State, and the State from the Church.” It wasn’t until 1965 – some 100 years later – that the Second Vatican Council, in The Declaration on Religious Freedom, would affirm that “a wrong is done when government imposes upon its people, by force or fear or other means, the profession or repudiation of any religion. …”

A second major reason why popes may refrain from making top-down changes is that they may not want to operate like a dictator issuing executive orders in an authoritarian manner. Francis was accused by his critics of acting in this way with his positions on Eucharist for those remarried without a prior annulment and on blessings for gay couples. The major thrust of his papacy, however, with his emphasis on synodality, was actually in the opposite direction.

Notably, when the Amazon Synod – held in Rome in October 2019 – voted 128-41 to allow for married priests in the Brazilian Amazon region, Francis rejected it as not being the appropriate time for such a significant change.

Past doctrines

The belief that the pope should express the faith of the people and not simply his own personal opinions is not a new insight from Francis.

The doctrine of papal infallibility, declared at the First Vatican Council in 1870, held that the pope, under certain conditions, could express the faith of the church without error.

The limitations and qualifications of this power include that the pope be speaking not personally but in his official capacity as the head of the church; he must not be in heresy; he must be free of coercion and of sound mind; he must be addressing a matter of faith and morals; and he must consult relevant documents and other Catholics so that what he teaches represents not simply his own opinions but the faith of the church.

The Marian doctrines of the Immaculate Conception and the Assumption offer examples of the importance of consultation. The Immaculate Conception, proclaimed by Pope Pius IX in 1854, is the teaching that Mary, the mother of Jesus, was herself preserved from original sin, a stain inherited from Adam that Catholics believe all other human beings are born with, from the moment of her conception. The Assumption, proclaimed by Pius XII in 1950, is the doctrine that Mary was taken body and soul into heaven at the end of her earthly life.

The documents in which these doctrines were proclaimed stressed that the bishops of the church had been consulted and that the faith of the lay people was being affirmed.

Unity, above all

One of the main duties of the pope is to protect the unity of the Catholic Church. On one hand, making many changes quickly can lead to schism, an actual split in the community.

In 2022, for example, the Global Methodist Church split from the United Methodist Church over same-sex marriage and the ordination of noncelibate gay bishops. There have also been various schisms within the Anglican communion in recent years. The Catholic Church faces similar challenges but so far has been able to avoid schisms by limiting the actual changes being made.

On the other hand, not making reasonable changes that acknowledge positive developments in the culture regarding issues such as the full inclusion of women or the dignity of gays and lesbians can result in the large-scale exit of members.

Pope Leo XIV, I argue, needs to be a spiritual leader, a person of vision, who can build upon the legacy of his immediate predecessors in such a way as to meet the challenges of the present moment. He already stated that he wants a synodal church that is “close to the people who suffer,” signaling a great deal about the direction he will take.

If the new pope is able to update church teachings on some hot-button issues, it will be precisely because Francis set the stage for him.

Dennis Doyle, Professor Emeritus of Religious Studies, University of Dayton

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Tree signalling and solar eclipses

‘A living collective’: study shows trees synchronise electrical signals during a solar eclipse

Zenit Arti Audiovisive

Monica Gagliano, Southern Cross University and Prudence Gibson, UNSW Sydney

Earth’s cycles of light and dark profoundly affect billions of organisms. Events such as solar eclipses are known to bring about marked shifts in animals, but do they have the same effect on plants?

During a solar eclipse in a forest in Italy’s Dolomites region, scientists seized the chance to explore that fascinating question.

The researchers were monitoring the bioelectrical impulses of spruce trees, when a solar eclipse passed over. They left their sensors running to record the trees’ response to the eclipse – and what they observed was astonishing.

The spruce trees not only responded to the solar eclipse – they actively anticipated it, by synchronising their bioelectrical signals hours in advance.

This forest-wide phenomenon, detailed today in the journal Royal Society Open Science, reveals a new layer of complexity in plant behaviour. It adds to emerging evidence that plants actively participate in their ecosystems.

Lead author Monica Gagliano discusses the research findings.

Do trees respond collectively?

The research was led by Professor Alessandro Chiolerio of the Italian Institute of Technology, and Professor Monica Gagliano from Australia’s Southern Cross University, who is the lead author on this article. It also involved a team of international scientists.

A solar eclipse occurs when the Moon passes between the Sun and Earth, fully or partially blocking the Sun’s light.

An eclipse can inspire awe and even social cohesion in humans. Other animals have been shown to gather and synchronise their movements during such an event.

But scientists know very little about how plants respond to solar eclipses. Some research suggests the rapid transitions from darkness to light during an eclipse can change plant behaviour. But this research focuses on the responses of individual plants.

The latest study set out to discover if trees respond to a solar eclipse together, as a living collective.

Alessandro Chiolerio and Monica Gagliano at the site of the study. Simone Cargnoni

What the research involved

Charged molecules travel through the cells of all living organisms, transmitting electrical signals as they go. Collectively, this electrical activity is known as the organism’s “electrome”.

The electrical activity is primarily driven by the movement of ions across cell membranes. It creates tiny currents that allow organisms, including humans, to coordinate their body and communicate.

The researchers wanted to investigate the electrical signals of spruce trees (Picea abies) during a partial solar eclipse on October 25, 2022. It took place in the Costa Bocche forest near Paneveggio in the Dolomites area, Italy.

The study took place in the Dolomites in northeast Italy. Monica Gagliano

The scientists set out to understand the trees’ electrical activity during the hour-long eclipse. They used custom-built sensors and wired them to three trees. Two were healthy trees about 70 years old, one in full sun and one in full shade. The third was a healthy tree about 20 years old, in full shade.

They also attached the sensors to five tree stumps – the remnants old trees, originally part of a pristine forest, but which were devastated by a storm several years earlier.

For each tree and stump, the researchers used five pairs of electrodes, placed in both the inner and outer layers of the tree, including on exposed roots, branches and trunks. The electrodes were connected to the sensors.

This set-up allowed the scientists to monitor the bioelectrical activity from multiple trees and stumps across four sites during the solar eclipse. They examined both individual tree responses, and bioelectrical signals between trees.

In particular, the scientists measured changes in the trees’ “bioelectrical potentials”. This term refers to the differences in voltage across cell membranes.

The scientists attached electrodes and sensors to the trees to monitor their electrical activity. Zenit Arti Audiovisive

What did they find?

The electrical activity of all three trees became significantly more synchronised around the eclipse - both before and during the one-hour event. These changes occur at a microscopic level, such as inside water and lymph molecules in the tree.

The two older trees in the study had a much more pronounced early response to the impending eclipse than the young tree. This suggests older trees may have developed mechanisms to anticipate and respond to such events, similar to their responses to seasonal changes.

Solar eclipses may seem rare from a human perspective, but they follow cycles which can occur well within the lifespan of long-lived trees. The scientists also detected bioelectrical waves travelling between the trees. This suggests older trees may transmit their ecological knowledge to younger trees.

Such a dynamic is consistent with studies showing long-distance signalling between plants can help them coordinate various physiological functions in response to environmental changes.

The two older spruce trees in the study had a much more pronounced early response to the impending eclipse than the young tree. Zenith Audiovisual Arts

The researchers also detected changes in the bioelectrical responses of the stumps during the eclipse, albeit less pronounced than in the standing trees. This suggests the stumps were still alive.

The research team then used computer modelling, and advanced analytical methods including quantum field theory, to test the findings of the physical experiment.

The results reinforced the experimental results. That is, not only did the eclipse influence the bioelectrical responses of individual trees, the activity was correlated. This suggests a cohesive, organism-like reaction at the forest scale.

The researchers also detected changes in the bioelectrical responses of the stumps during the eclipse. Zenit Arti Audiovisive

Understanding forest connections

These findings align with extensive prior research by others, highlighting the extent to which trees in forest ecosystems are connected.

These behaviours may ultimately influence the forest ecosystem’s resilience, biodiversity and overall function, by helping it cope with rapid and unpredictable changes.

The findings also underscore the importance of protecting older forests, which serve as pillars of ecosystem resilience – potentially preserving and transmitting invaluable ecological knowledge.

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This research is featured in a documentary, Il Codice del Bosco (The Forest Code), premiering in Italy on May 1, 2025.

The findings underscore the importance of protecting older forests. Pictured: the Dolomites region. Zenith Audiovisual Arts

Monica Gagliano, Research Associate Professor in Evolutionary Biology, Southern Cross University and Prudence Gibson, Lecturer and Researcher in Plant Humanities, UNSW Sydney

This article is republished from The Conversation under a Creative Commons license. Read the original article.