Sunday, July 25, 2021
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Geology Page

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Chuandianella ovata, an extinct shrimp-like crustacean.
Fossils

Paleonursery offers rare, detailed glimpse at life 518 million years ago

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Nierra Negra Volcano on the Galapagos Islands
Volcanoes

New model for shield volcano eruption

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A "Plume" in the Earth's mantle, i.e. a surge of hot material, caused the Indian Plate to spin off. (Graphic: Alisha Steinberger)
plate tectonics

Supervolcano fed from Earth’s mantle caused crustal plates to rotate

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Ordovician black shales of the Mount Hare Formation, Road River Group (approximately 465 million years old) rise above conglomerates of the Aberdeen Member. The dangerous rapids of Aberdeen Canyon (Nan Zhak Nadhàdlaii), created by the Peel River cutting through the resistant conglomerates, appear at bottom left. (Image credit: Erik Sperling)
Paleontology

Longest known continuous record of the Paleozoic discovered in Yukon wilderness

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Upper molar of Altaynycteris aurora. Credit: Li Qiang
Fossils

Researchers detail the most ancient bat fossil ever discovered in Asia

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Boriana Kalderon-Asael conducts field work at a Middle-Upper Ordovician outcrop near Reedsville, Penn. Credit: Ashleigh Hood
climate

Earth’s climate life story, 3 billion years in the making

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The Alum Shale, here an example of a coastal deposit, consists of quartz and potassium Feldspar clasts as well as conspicuous Pyrite crystals (here: white) embedded in a clayey matrix. Scanning electron micrograph (scale: lower image edge length corresponds to approx. 40 μm). Credit: Schulz, GFZ
Earth

A rock with many perspectives

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Gold in pyrite
Mineral Researches

‘Fool’s gold’ not so foolish after all

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The asteroid belt between Jupiter and Mars is the main source of extraterrestrial material that lands on Earth. (Illustration: ESA/ATG Medialab)
Meteorites

Earth’s meteorite impacts over past 500 million years tracked

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Uskiella spargen a small plant whose axes divide several times before bearing oval sporangia. Credit : Cyrille Prestianni
Fossils

Discovery of the oldest plant fossils on the African continent!

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The early Earth was hotter than it is today and this affected the strength of the crust and mantle.
Earth

The Earth has a pulse — a 27.5-million-year cycle of geological...

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Open cut hard rock mining, Kalgoorlie, Western Australia.
Mining

Mining precious rare-earth elements from coal fly ash with a reusable...

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An artistic representation of the potentially habitable planet Kepler 422-b (left), compared with Earth (right). Credit: Ph03nix1986 / Wikimedia Commons
Earth

Earth-like biospheres on other planets may be rare

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One of the strombolian explosions that have occurred at Stromboli about every 10 minutes for at least 2000 years. © UNIGE, Luca Caricchi
Volcanoes

Analysing volcanoes to predict their awakening

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A new study led by A&S professor Tao Wen used a novel method of machine learning to explore the environmental impact of oil and gas drilling.
Hydrocarbons

Environmental impact of hydrofracking vs. conventional gas/oil drilling: Research shows the...

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In the time between mega-earthquakes, smaller earthquakes continuously occur between oceanic and continental plates (background earthquakes). Where a lot of energy is released through these earthquakes, we observe coastal mountains that rise faster. In contrast, slow-uplifting coastal areas coincide with fewer background earthquakes. Credit: University of Tübingen
Earthquake

Continuous activity of small earthquakes makes mountains grow

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Chunks of exotic green rocks from the mantle erupted from the San Carlos Volcanic Field, Arizona. Credit: James St John
Earthquake

Rock crystals from the deep give microscopic clues to earthquake ground...

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Agung, a volcano in Bali, had an explosive eruption in 2018. Credit: O.L. Andersen
Volcanoes

New knowledge of Earth’s mantle helps to explain Indonesia’s explosive volcanoes

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Zircons studied by the research team, photographed using cathodoluminescence, a technique that allowed the team to visualize the interiors of the crystals using a specialized scanning electron microscope. Dark circles on the zircons are the cavities left by the laser that was used to analyze the age and chemistry of the zircons.Scientists led by Michael Ackerson, a research geologist at the Smithsonian's National Museum of Natural History, provide new evidence that modern plate tectonics, a defining feature of Earth and its unique ability to support life, emerged roughly 3.6 billion years ago. The study, published May 14 in the journal Geochemical Perspective Letters, uses zircons, the oldest minerals ever found on Earth, to peer back into the planet's ancient past.The team tested more than 3,500 zircons, each just a couple of human hairs wide, by blasting them with a laser and then measuring their chemical composition with a mass spectrometer. These tests revealed the age and underlying chemistry of each zircon. Of the thousands tested, about 200 were fit for study due to the ravages of the billions of years these minerals endured since their creation. Credit: Michael Ackerson, Smithsonian.
Earth

Earth’s oldest minerals date onset of plate tectonics to 3.6 billion...

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McGill Colloidal Au research team study a mineralized (gold-bearing) vein underground at the Brucejack mine. Credit: Duncan McLeish
Earth

Clues from soured milk reveal how gold veins form

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