Lexi Webster
Pumice is a lightweight volcanic rock that is formed when hot magma cools rapidly in water. In Australia, pumice has been found on the east coast, with rafts of pumice stones washing up on beaches. These pumice rafts are believed to have originated from underwater volcanic eruptions near Tonga, with one specific eruption in 2001 traced to 'Volcano F'. Additionally, in Western Australia, the Apex Basalt region has provided samples of pumice that are valuable for studying the early biosphere and the origins of life.
| Characteristics | Values |
|---|---|
| Location | East coast of Australia, specifically the Pilbara region in Western Australia |
| Source | Submarine volcano on the Tofua volcanic arc, 50 km off the coast of the Tongan island of Vava'u |
| Distance Travelled | Thousands of kilometres |
| Time Taken | Approximately one year to reach Australia |
| Appearance | Raft of lightweight, bubbly volcanic rock |
| Speed | Expected to reach the Great Barrier Reef in late January to early February |
| Marine Life | Algae, barnacles, worms, coral, goose barnacles, acorn barnacles, molluscs, anemones, bristle worms, hydroids, crabs |
| Texture | Deeply permeated by intimate associations of C, O, N, P and S |
| Lining | Carbon, titanium oxide, iron sulfide, aluminosilicate minerals |
| Studies | Origin studies, marine ecology, and early life forms |
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What You'll Learn
Pumice found on Australian beaches
Pumice is a fascinating rock that forms when hot magma from volcanoes cools rapidly in water, resulting in a light and bubbly stone. While it may seem unusual to find pumice on Australian beaches, it is not uncommon for rafts of pumice to wash up on the shore, often originating from underwater volcanic eruptions in the Pacific Ocean.
In 2019, a vast raft of floating volcanic rock, or pumice, was spotted in the Pacific Ocean through satellite imagery. This pumice raft was traced back to an underwater volcano, now named Volcano F, located about 50 kilometres off the coast of the Tongan island of Vava'u. The eruption of Volcano F in 2001 resulted in a similar event, with the pumice eventually reaching the east coast of Australia in 2002. On this occasion, the pumice was covered in algae, barnacles, worms, and coral, providing a mobile habitat for various marine organisms as it travelled across the ocean.
The east coast of Australia, in particular, has been a frequent recipient of pumice wash-ups. In 2022, beachcombers noticed an abundance of pumice stone at the high tide mark along this coastline. While initially thought to be from the Hunga Tonga–Hunga Ha'apai underwater eruption in January of that year, volcanologists like Professor Scott Bryan suggested otherwise. He explained that the magma from the January eruption lacked the necessary gas content to create the lightweight pumice stones capable of drifting long distances.
Pumice can also provide valuable insights into the early biosphere and the origins of life on Earth. In Western Australia, the Apex Basalt in the Pilbara region has been studied as a natural laboratory. Here, pumice clasts were found to be deeply permeated by intimate associations of elements such as carbon, oxygen, nitrogen, phosphorus, and sulfur. Additionally, the presence of pumice rafts in the Paleo-Archean ocean has been linked to the development of some of the first primitive life forms.
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Pumice from underwater volcanoes
Pumice is often found in Australia, with rafts of the stone washing up on the country's beaches. These rafts are formed when hot magma from underwater volcanoes cools rapidly in water.
In 2019, a raft of pumice the size of Paris was spotted heading towards the Great Barrier Reef. It was thought to have been produced by the eruption of an underwater volcano around 50 kilometres off the coast of the Tongan island of Vava'u. The previously unnamed volcano was subsequently labelled Volcano F by researchers. The pumice raft was expected to bring millions of individual corals and other organisms to the Great Barrier Reef, enhancing the biodiversity of the region.
In 2021, an enormous underwater volcanic eruption off the coast of Japan resulted in waves of pumice washing up along the Okinawa Prefecture. The Fukutoku-Okanoba volcano, located about 800 miles from Tokyo, was identified as the source of the eruption.
In addition to these events, there have been other instances of pumice rafts drifting towards Australia. In 2002, a vast raft of pumice originating from Volcano F reached the east coast of Australia, with the rocks providing a mobile habitat for various marine organisms. Similarly, in 2012, a pumice raft spanning 300 miles in length and 30 miles in width was observed near New Zealand, resulting from the eruption of the Havre caldera volcano in the Southwest Pacific.
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Pumice in Western Australia
Pumice, a low-density vesicular volcanic rock, has been found on the east coast of Australia. Beachgoers have noticed the presence of pumice stones at the high-tide mark. These stones are formed when hot magma from underwater volcanic eruptions cools rapidly in water.
In Western Australia, pumice samples have been found in the ~3460 Ma Apex Basalt of the Warrawoona Group. This unit is in the Pilbara region, which is of great value for studying the origins of life. The Apex Basalt combines evidence for komatiitic lavas, tuffs, and porous volcanic rocks, and it contains some of the best-preserved silica-rich hydrothermal and fissure eruption systems from the Archaean. The presence of pumice rafts in the Warrawoona Group at North Pole, Western Australia, has been reported, indicating the potential for paleoecosystem studies.
The Apex Basalt in the Pilbara region of Western Australia is a geological heritage site that preserves evidence of one of the earliest known ecosystems on Earth. The pumice raft in the Paleo-Archean ocean appears to have facilitated the development of early organisms. The site contains valuable information about the dynamics of the Earth and the paleoenvironment, which can be interpreted by professionals to gain a deeper understanding of the past.
The discovery of pumice in Western Australia provides insights into the early biosphere and the potential for life's origin. The Apex Basalt unit, with its silica-rich hydrothermal and fissure eruption systems, offers a unique laboratory for studying the accumulation and concentration of chemical reactants necessary for the emergence of life. The presence of elements like carbon, oxygen, nitrogen, phosphorus, and sulfur within the pumice clasts further enhances its significance in understanding the natural processes that occurred in Western Australia's geological history.
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Pumice from the Tofua volcanic arc
Pumice is formed when hot magma from volcanoes cools rapidly in water, resulting in a frothing effect in the lava that captures bubbles of volcanic gas as it cools. In 2019, a vast raft of floating volcanic rock was discovered in the Pacific Ocean, which was later traced to an origin 50 kilometres off the coast of the Tongan island of Vava'u. Satellite imagery captured by the ESA's Sentinel-2 satellite revealed that the source of the floating rock was a previously unnamed submarine volcano on the Tofua volcanic arc, which was subsequently labelled Volcano F by researchers.
The Tofua volcanic arc is a chain of volcanoes on the edge of a tectonic plate that is moving underneath the plate next to it. The volcano produced a pumice raft that initially spanned 136.7 square kilometres, with rocks that were covered in algae, barnacles, worms, and coral. The pumice raft took about a year to reach the east coast of Australia in October 2002, where it was spotted at the high tide mark on beaches.
Volcano F is located on Tofua Island, which is part of the Tonga Islands group in the central Pacific Ocean. Tofua Island is a nearly circular island with a diameter of approximately 9.5 by 7.1 kilometres. The island is characterised by steep flanks that lead up to a well-defined caldera rim reaching elevations of 515 metres in the northwest and southeast. The inner caldera walls are precipitous, and the caldera contains a large, cold, freshwater lake at 30 metres elevation.
The most recent volcanic activity on Tofua Island occurred from vents within the northern half of the caldera, where there are three cinder cone complexes. The westernmost cinder cone complex is densely forested and somewhat degraded. The volcano is known to be very active, and researchers have emphasised the importance of further scientific attention to understand its geochemistry and potential impact on marine ecology.
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Pumice raft in the Paleo-Archean ocean
Pumice is a stone formed when hot magma from volcanoes cools rapidly in water. Pumice rafts are floating rafts of pumice created by some eruptions of submarine volcanoes or coastal subaerial volcanoes. They are characterised by their high surface-area-to-volume ratio, long-term flotation, beaching in the tidal zone, exposure to a variety of conditions, and ability to absorb many potentially advantageous elements and compounds.
Pumice rafts have been proposed as a possible ideal substrate for the origin of life. Biologists have suggested that animals and plants have migrated from island to island on pumice rafts. In 1876, the whaling ship Velocity reported the sighting of Sandy Island, a non-existent island near New Caledonia, which was included on some maps well into the 20th century. According to a team of University of Sydney scientists, it is possible that this false report may have been due to the Velocity mistaking a pumice raft for an island.
In the context of the Paleo-Archean ocean, pumice rafts have been proposed as one of the different scenarios for the emergence of life. The porous nature of pumice rafts and their location at the air-water interface suggest that silica gel may have been precipitated during evaporation. This could have provided an additional advantage to the proposed emergence of life on pumice rafts.
In recent years, a vast raft of floating volcanic rock, specifically pumice, was observed in the Pacific Ocean. This pumice raft was traced back to an underwater volcano 50 kilometres off the coast of the Tongan island of Vava'u. The previously unnamed volcano was subsequently labelled Volcano F by researchers. The pumice raft eventually reached the east coast of Australia in October 2002, with the rocks covered in various forms of marine life, including algae, barnacles, worms, and coral.
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Frequently asked questions
Pumice is a type of volcanic rock that forms when hot magma from volcanoes cools rapidly in water.
Pumice has been found on the beaches of Australia's east coast. In 2002, a pumice raft from the eruption of an underwater volcano off the coast of Tonga reached the east coast of Australia.
The source of the pumice raft was identified using satellite imagery. On August 6, 2019, ESA's Sentinel-2 satellite captured images of two clear circular eruption plumes on the surface of the ocean above a submarine volcano on the Tofua volcanic arc.
Pumice samples from Western Australia, specifically the Apex Basalt in the Pilbara region, have provided valuable insights into the early biosphere and the origins of life on Earth. The Apex Basalt site preserves evidence of one of the earliest known ecosystems, with pumice rafts facilitating the development of some of the first organisms.
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