Researchers Bei Chen (GFZ German Research Center for Geosciences) and Ian H. Campbell (Australian National University) studied microscopic zircon grains from marine sediments around Antarctica. These grains, eroded from ancient mountain roots now buried under ice, mostly date to 650- 450 million years ago, during the assembly of the supercontinent Gondwana (which included modern Antarctica, South America, Africa, Arabia, India, Australia, and Madagascar).

Comparisons with global river- sediment data indicate many zircons originated deep in the roots of Himalayan- scale peaks. The authors describe the Gondwanan Super- mountains as “the largest ultra-high mountain network in Earth’s history.”

As these vast ranges eroded, they delivered large volumes of sediment and nutrients into the oceans. This is thought to have boosted photosynthetic microbes at the base of the food web, increasing oxygen production. Sediment from the mountains also helped bury organic carbon, preventing it from recombining with oxygen and thereby allowing atmospheric oxygen levels to rise.

The researchers note that Earth’s most dramatic evolutionary period (leading into the Cambrian explosion) coincides with this major episode of mountain building, and they consider the connection unlikely to be coincidental.

The study is published in Earth and Planetary Science Letters. It builds on earlier ideas about “super mountains” influencing the evolution of life.

Gondwanan Super mountains (also called the Gondwana Super- mountains or linked to the earlier term Transgondwanan Super mountain) refer to an enormous network of Himalayan- scale mountain ranges that formed during the assembly of the supercontinent Gondwana roughly 650- 450 million years ago.

These were among the largest ultra- high mountain systems in Earth’s history. Estimates for the main Transgondwanan segment put it at over 8,000 km long and more than 1,000 km wide, roughly three to four times the length of today’s Himalayas. They rose through major continental collisions as East and West Gondwana came together (involving blocks that now form parts of Antarctica, India, Australia, Africa/Kalahari, Arabia, and related regions).

A 2026 study by Bei Chen and Ian H. Campbell (published in Earth and Planetary Science Letters) used detrital zircon grains from Antarctic marine sediments to show that Antarctica’s tectonics during this interval were dominated by such Himalayan- style mountains.

Chemical signatures in many zircons point to deep crustal roots formed under extreme pressures. The authors describe the Gondwanan Supermountains as “the largest ultra- high mountain network in Earth’s history”, with remnants of those roots still lying beneath the East Antarctic Ice Sheet.

As the ranges eroded (before land plants existed, so erosion rates were exceptionally high), they dumped vast quantities of sediment and nutrients (phosphorus, iron, etc.) into surrounding oceans. This is thought to have:

• Stimulated blooms of photosynthetic microbes, boosting oxygen production.
• Enabled rapid burial of organic carbon and reduced materials (e.g., pyrite) in what may have been the largest turbidite/sediment fan systems in the geological record. Burial allowed free oxygen to accumulate in the atmosphere rather than being consumed again.

The resulting rise in atmospheric oxygen is considered one of the largest in Earth’s history and is linked to the appearance of the first large animals (~575 Ma, Ediacaran) and the subsequent Cambrian explosion (~538- 530 Ma), when most major animal groups appear in the fossil record. Researchers note that the timing of this mountain- building and erosion episode with these evolutionary milestones is unlikely to be coincidental.

This concept builds on earlier work:

• 2006 research (Squire, Campbell and others) introduced the Transgondwanan Super mountain as a potential trigger for the Cambrian radiation via nutrient flux and sedimentation.
• A 2022 study (Zhu, Campbell and colleagues) identified only two major super mountain episodes in Earth history: the older Nuna Super- mountains (~2.0-1.8 billion years ago, linked to early eukaryotes) and the Gondwanan/Transgondwanan event. Mountain building was limited during the intervening “Boring Billion.”

In short, the Gondwanan Super mountains represent a key geological driver that helped set the environmental stage for the rise of complex animal life.

Do Himalayan- style mountains lie under the Antarctic ice: Implication for the Gondwana Super mountains, the rise of oxygen and the Cambrian explosion?

Researchers analyzed 1,712 detrital zircon grains recovered from marine sediments around Antarctica (plus earlier Antarctic zircon data). Zircons act as durable “time capsules”: U- Pb dating gives crystallization ages, while chemistry (including indicators of high-pressure conditions) reveals the tectonic environment in which they formed.

• A strong age peak occurs between 650 and 450 million years ago, coinciding with the assembly of the supercontinent Gondwana.
• Many zircons carry chemical signatures typical of the deep roots of Himalayan- style (ultra- high) mountains, rocks that experienced extreme pressures under thick crustal piles.
• When the Antarctic data are integrated into global river- sediment zircon compilations (area- weighted), the Gondwanan signal stands out as the largest supercontinent- related mountain- building peak in Earth’s history. The authors call these the Gondwanan Super mountains, the largest ultra- high mountain network known.

Collisions involving blocks that are now Antarctica, India, Australia, and the Kalahari are inferred to have built these ranges. Their roots are interpreted to still lie buried beneath the East Antarctic Ice Sheet.

As the supermountains eroded, they delivered enormous volumes of sediment and nutrients (including phosphorus and iron) into surrounding oceans. This is thought to have:

• Stimulated primary production by photosynthetic microbes (algae and cyanobacteria), increasing oxygen generation.
• Enabled rapid burial of organic carbon and pyrite- rich sediments in what may have been the largest turbidite fan system in the geological record. Burial prevented the oxygen from being consumed again, allowing atmospheric O₂ levels to rise substantially.

The authors argue that the temporal overlap between this major mountain- building and erosion episode and Earth’s most dramatic evolutionary radiation (the appearance of large animals in the Ediacaran and the Cambrian explosion ~538- 530 Ma) is unlikely to be coincidental.

This work extends earlier “super mountain” ideas (including the Transgondwanan Super mountain concept) by specifically highlighting Antarctica’s contribution and the chemical evidence for Himalayan-scale topography.

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The linked page is the scientific paper itself (behind a ScienceDirect paywall/subscription):

Title: Do Himalayan-style mountains lie under the Antarctic ice: Implication for the Gondwana Supermountains, the rise of oxygen and the Cambrian explosion?

Journal: Earth and Planetary Science Letters (2026)

DOI: 10.1016/j.epsl.2026.120330

Authors: Bei Chen & Ian H. Campbell

Abstract

Analyses of detrital zircons from Antarctica show that its tectonics were dominated by Himalayan-style mountains, the roots of which now underlie the ice sheet. These mountains formed during the amalgamation of Gondwana and when the Antarctic data are added to the global river zircon database and appropriately weighted, it is apparent that the mountains, which formed by the amalgamation of Gondwana, were our planet’s dominant mountain-forming event. Nutrients shed during the erosion of the Gondwanan mountains fertilized the oceans, leading to a proliferation of primary production that formed the base of the animal food web. Burial of the abundant carbon produced by photosynthesis was responsible for a marked increase in atmospheric oxygen, which facilitated first the rise of animals and later the Cambrian explosion. Approximately 46% of the detrital zircons in the weighted global database, during the critical period from the base of the Cambrian to the end of the Cambrian explosion, and 55% of the high-pressure grains, were derived from Antarctica.